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
  27 static_decl_rpc;
  28
  29 #ifdef WITH_DFS
  30 extern int dcelogin_atmost_once;
  31 #endif /* WITH_DFS */
  32
  33 int smbd_server_fd(void)
  34 {
  35         return server_fd;
  36 }
  37
  38 static void smbd_set_server_fd(int fd)
  39 {
  40         server_fd = fd;
  41 }
  42
  43 int get_client_fd(void)
  44 {
  45         return server_fd;
  46 }
  47
  48 struct event_context *smbd_event_context(void)
  49 {
  50         if (!smbd_event_ctx) {
  51                 smbd_event_ctx = event_context_init(talloc_autofree_context());
  52         }
  53         if (!smbd_event_ctx) {
  54                 smb_panic("Could not init smbd event context");
  55         }
  56         return smbd_event_ctx;
  57 }
  58
  59 struct messaging_context *smbd_messaging_context(void)
  60 {
  61         if (smbd_msg_ctx == NULL) {
  62                 smbd_msg_ctx = messaging_init(talloc_autofree_context(),
  63                                               server_id_self(),
  64                                               smbd_event_context());
  65         }
  66         if (smbd_msg_ctx == NULL) {
  67                 DEBUG(0, ("Could not init smbd messaging context.\n"));
  68         }
  69         return smbd_msg_ctx;
  70 }
  71
  72 struct memcache *smbd_memcache(void)
  73 {
  74         if (!smbd_memcache_ctx) {
  75                 smbd_memcache_ctx = memcache_init(talloc_autofree_context(),
  76                                                   lp_max_stat_cache_size()*1024);
  77         }
  78         if (!smbd_memcache_ctx) {
  79                 smb_panic("Could not init smbd memcache");
  80         }
  81
  82         return smbd_memcache_ctx;
  83 }
  84
  85 /*******************************************************************
  86  What to do when smb.conf is updated.
  87  ********************************************************************/
  88
  89 static void smb_conf_updated(struct messaging_context *msg,
  90                              void *private_data,
  91                              uint32_t msg_type,
  92                              struct server_id server_id,
  93                              DATA_BLOB *data)
  94 {
  95         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
  96                   "updated. Reloading.\n"));
  97         change_to_root_user();
  98         reload_services(False);
  99 }
 100
 101
 102 /*******************************************************************
 103  Delete a statcache entry.
 104  ********************************************************************/
 105
 106 static void smb_stat_cache_delete(struct messaging_context *msg,
 107                                   void *private_data,
 108                                   uint32_t msg_tnype,
 109                                   struct server_id server_id,
 110                                   DATA_BLOB *data)
 111 {
 112         const char *name = (const char *)data->data;
 113         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 114         stat_cache_delete(name);
 115 }
 116
 117 /****************************************************************************
 118   Send a SIGTERM to our process group.
 119 *****************************************************************************/
 120
 121 static void  killkids(void)
 122 {
 123         if(am_parent) kill(0,SIGTERM);
 124 }
 125
 126 /****************************************************************************
 127  Process a sam sync message - not sure whether to do this here or
 128  somewhere else.
 129 ****************************************************************************/
 130
 131 static void msg_sam_sync(struct messaging_context *msg,
 132                          void *private_data,
 133                          uint32_t msg_type,
 134                          struct server_id server_id,
 135                          DATA_BLOB *data)
 136 {
 137         DEBUG(10, ("** sam sync message received, ignoring\n"));
 138 }
 139
 140 static void msg_exit_server(struct messaging_context *msg,
 141                             void *private_data,
 142                             uint32_t msg_type,
 143                             struct server_id server_id,
 144                             DATA_BLOB *data)
 145 {
 146         DEBUG(3, ("got a SHUTDOWN message\n"));
 147         exit_server_cleanly(NULL);
 148 }
 149
 150 #ifdef DEVELOPER
 151 static void msg_inject_fault(struct messaging_context *msg,
 152                              void *private_data,
 153                              uint32_t msg_type,
 154                              struct server_id src,
 155                              DATA_BLOB *data)
 156 {
 157         int sig;
 158
 159         if (data->length != sizeof(sig)) {
 160
 161                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 162                           procid_str_static(&src)));
 163                 return;
 164         }
 165
 166         sig = *(int *)data->data;
 167         if (sig == -1) {
 168                 exit_server("internal error injected");
 169                 return;
 170         }
 171
 172 #if HAVE_STRSIGNAL
 173         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 174                   procid_str_static(&src), sig, strsignal(sig)));
 175 #else
 176         DEBUG(0, ("Process %s requested injection of signal %d\n",
 177                   procid_str_static(&src), sig));
 178 #endif
 179
 180         kill(sys_getpid(), sig);
 181 }
 182 #endif /* DEVELOPER */
 183
 184 /*
 185  * Parent smbd process sets its own debug level first and then
 186  * sends a message to all the smbd children to adjust their debug
 187  * level to that of the parent.
 188  */
 189
 190 static void smbd_msg_debug(struct messaging_context *msg_ctx,
 191                            void *private_data,
 192                            uint32_t msg_type,
 193                            struct server_id server_id,
 194                            DATA_BLOB *data)
 195 {
 196         struct child_pid *child;
 197
 198         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 199
 200         for (child = children; child != NULL; child = child->next) {
 201                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 202                                    MSG_DEBUG,
 203                                    data->data,
 204                                    strlen((char *) data->data) + 1);
 205         }
 206 }
 207
 208 static void add_child_pid(pid_t pid)
 209 {
 210         struct child_pid *child;
 211
 212         child = SMB_MALLOC_P(struct child_pid);
 213         if (child == NULL) {
 214                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 215                 return;
 216         }
 217         child->pid = pid;
 218         DLIST_ADD(children, child);
 219         num_children += 1;
 220 }
 221
 222 /*
 223   at most every smbd:cleanuptime seconds (default 20), we scan the BRL
 224   and locking database for entries to cleanup. As a side effect this
 225   also cleans up dead entries in the connections database (due to the
 226   traversal in message_send_all()
 227
 228   Using a timer for this prevents a flood of traversals when a large
 229   number of clients disconnect at the same time (perhaps due to a
 230   network outage).
 231 */
 232
 233 static void cleanup_timeout_fn(struct event_context *event_ctx,
 234                                 struct timed_event *te,
 235                                 struct timeval now,
 236                                 void *private_data)
 237 {
 238         struct timed_event **cleanup_te = (struct timed_event **)private_data;
 239
 240         DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
 241         message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
 242         messaging_send_buf(smbd_messaging_context(), procid_self(),
 243                                 MSG_SMB_BRL_VALIDATE, NULL, 0);
 244         /* mark the cleanup as having been done */
 245         (*cleanup_te) = NULL;
 246 }
 247
 248 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 249 {
 250         struct child_pid *child;
 251         static struct timed_event *cleanup_te;
 252
 253         if (unclean_shutdown) {
 254                 /* a child terminated uncleanly so tickle all
 255                    processes to see if they can grab any of the
 256                    pending locks
 257                 */
 258                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
 259                         (unsigned int)pid));
 260                 if (!cleanup_te) {
 261                         /* call the cleanup timer, but not too often */
 262                         int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
 263                         cleanup_te = event_add_timed(smbd_event_context(), NULL,
 264                                                 timeval_current_ofs(cleanup_time, 0),
 265                                                 cleanup_timeout_fn,
 266                                                 &cleanup_te);
 267                         DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
 268                 }
 269         }
 270
 271         for (child = children; child != NULL; child = child->next) {
 272                 if (child->pid == pid) {
 273                         struct child_pid *tmp = child;
 274                         DLIST_REMOVE(children, child);
 275                         SAFE_FREE(tmp);
 276                         num_children -= 1;
 277                         return;
 278                 }
 279         }
 280
 281         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 282 }
 283
 284 /****************************************************************************
 285  Have we reached the process limit ?
 286 ****************************************************************************/
 287
 288 static bool allowable_number_of_smbd_processes(void)
 289 {
 290         int max_processes = lp_max_smbd_processes();
 291
 292         if (!max_processes)
 293                 return True;
 294
 295         return num_children < max_processes;
 296 }
 297
 298 static void smbd_sig_chld_handler(struct tevent_context *ev,
 299                                   struct tevent_signal *se,
 300                                   int signum,
 301                                   int count,
 302                                   void *siginfo,
 303                                   void *private_data)
 304 {
 305         pid_t pid;
 306         int status;
 307
 308         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 309                 bool unclean_shutdown = False;
 310
 311                 /* If the child terminated normally, assume
 312                    it was an unclean shutdown unless the
 313                    status is 0
 314                 */
 315                 if (WIFEXITED(status)) {
 316                         unclean_shutdown = WEXITSTATUS(status);
 317                 }
 318                 /* If the child terminated due to a signal
 319                    we always assume it was unclean.
 320                 */
 321                 if (WIFSIGNALED(status)) {
 322                         unclean_shutdown = True;
 323                 }
 324                 remove_child_pid(pid, unclean_shutdown);
 325         }
 326 }
 327
 328 static void smbd_setup_sig_chld_handler(void)
 329 {
 330         struct tevent_signal *se;
 331
 332         se = tevent_add_signal(smbd_event_context(),
 333                                smbd_event_context(),
 334                                SIGCHLD, 0,
 335                                smbd_sig_chld_handler,
 336                                NULL);
 337         if (!se) {
 338                 exit_server("failed to setup SIGCHLD handler");
 339         }
 340 }
 341
 342 struct smbd_open_socket;
 343
 344 struct smbd_parent_context {
 345         bool interactive;
 346
 347         /* the list of listening sockets */
 348         struct smbd_open_socket *sockets;
 349 };
 350
 351 struct smbd_open_socket {
 352         struct smbd_open_socket *prev, *next;
 353         struct smbd_parent_context *parent;
 354         int fd;
 355         struct tevent_fd *fde;
 356 };
 357
 358 static void smbd_open_socket_close_fn(struct tevent_context *ev,
 359                                       struct tevent_fd *fde,
 360                                       int fd,
 361                                       void *private_data)
 362 {
 363         /* this might be the socket_wrapper swrap_close() */
 364         close(fd);
 365 }
 366
 367 static void smbd_accept_connection(struct tevent_context *ev,
 368                                    struct tevent_fd *fde,
 369                                    uint16_t flags,
 370                                    void *private_data)
 371 {
 372         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
 373                                      struct smbd_open_socket);
 374         struct sockaddr_storage addr;
 375         socklen_t in_addrlen = sizeof(addr);
 376         pid_t pid = 0;
 377
 378         smbd_set_server_fd(accept(s->fd,(struct sockaddr *)&addr,&in_addrlen));
 379
 380         if (smbd_server_fd() == -1 && errno == EINTR)
 381                 return;
 382
 383         if (smbd_server_fd() == -1) {
 384                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 385                          strerror(errno)));
 386                 return;
 387         }
 388
 389         if (s->parent->interactive) {
 390                 smbd_process();
 391                 exit_server_cleanly("end of interactive mode");
 392                 return;
 393         }
 394
 395         if (!allowable_number_of_smbd_processes()) {
 396                 close(smbd_server_fd());
 397                 smbd_set_server_fd(-1);
 398                 return;
 399         }
 400
 401         pid = sys_fork();
 402         if (pid == 0) {
 403                 NTSTATUS status = NT_STATUS_OK;
 404                 /* Child code ... */
 405                 am_parent = 0;
 406
 407                 /* Stop zombies, the parent explicitly handles
 408                  * them, counting worker smbds. */
 409                 CatchChild();
 410
 411                 /* close our standard file
 412                    descriptors */
 413                 close_low_fds(False);
 414
 415                 /*
 416                  * Can't use TALLOC_FREE here. Nulling out the argument to it
 417                  * would overwrite memory we've just freed.
 418                  */
 419                 talloc_free(s->parent);
 420                 s = NULL;
 421
 422                 status = reinit_after_fork(smbd_messaging_context(),
 423                                            smbd_event_context(), true);
 424                 if (!NT_STATUS_IS_OK(status)) {
 425                         if (NT_STATUS_EQUAL(status,
 426                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
 427                                 DEBUG(0,("child process cannot initialize "
 428                                          "because too many files are open\n"));
 429                                 goto exit;
 430                         }
 431                         DEBUG(0,("reinit_after_fork() failed\n"));
 432                         smb_panic("reinit_after_fork() failed");
 433                 }
 434
 435                 smbd_setup_sig_term_handler();
 436                 smbd_setup_sig_hup_handler();
 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 static bool parent_housekeeping_fn(const struct timeval *now, void *private_data)
 545 {
 546         DEBUG(5, ("houskeeping\n"));
 547         /* check if we need to reload services */
 548         check_reload(time(NULL));
 549         return true;
 550 }
 551
 552 /****************************************************************************
 553  Open the socket communication.
 554 ****************************************************************************/
 555
 556 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 557                               const char *smb_ports)
 558 {
 559         int num_interfaces = iface_count();
 560         int i;
 561         char *ports;
 562         unsigned dns_port = 0;
 563
 564 #ifdef HAVE_ATEXIT
 565         atexit(killkids);
 566 #endif
 567
 568         /* Stop zombies */
 569         smbd_setup_sig_chld_handler();
 570
 571         /* use a reasonable default set of ports - listing on 445 and 139 */
 572         if (!smb_ports) {
 573                 ports = lp_smb_ports();
 574                 if (!ports || !*ports) {
 575                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 576                 } else {
 577                         ports = talloc_strdup(talloc_tos(), ports);
 578                 }
 579         } else {
 580                 ports = talloc_strdup(talloc_tos(), smb_ports);
 581         }
 582
 583         if (lp_interfaces() && lp_bind_interfaces_only()) {
 584                 /* We have been given an interfaces line, and been
 585                    told to only bind to those interfaces. Create a
 586                    socket per interface and bind to only these.
 587                 */
 588
 589                 /* Now open a listen socket for each of the
 590                    interfaces. */
 591                 for(i = 0; i < num_interfaces; i++) {
 592                         const struct sockaddr_storage *ifss =
 593                                         iface_n_sockaddr_storage(i);
 594                         char *tok;
 595                         const char *ptr;
 596
 597                         if (ifss == NULL) {
 598                                 DEBUG(0,("open_sockets_smbd: "
 599                                         "interface %d has NULL IP address !\n",
 600                                         i));
 601                                 continue;
 602                         }
 603
 604                         for (ptr=ports;
 605                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 606                                 unsigned port = atoi(tok);
 607                                 if (port == 0 || port > 0xffff) {
 608                                         continue;
 609                                 }
 610
 611                                 /* Keep the first port for mDNS service
 612                                  * registration.
 613                                  */
 614                                 if (dns_port == 0) {
 615                                         dns_port = port;
 616                                 }
 617
 618                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 619                                         return false;
 620                                 }
 621                         }
 622                 }
 623         } else {
 624                 /* Just bind to 0.0.0.0 - accept connections
 625                    from anywhere. */
 626
 627                 char *tok;
 628                 const char *ptr;
 629                 const char *sock_addr = lp_socket_address();
 630                 char *sock_tok;
 631                 const char *sock_ptr;
 632
 633                 if (strequal(sock_addr, "0.0.0.0") ||
 634                     strequal(sock_addr, "::")) {
 635 #if HAVE_IPV6
 636                         sock_addr = "::,0.0.0.0";
 637 #else
 638                         sock_addr = "0.0.0.0";
 639 #endif
 640                 }
 641
 642                 for (sock_ptr=sock_addr;
 643                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 644                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 645                                 struct sockaddr_storage ss;
 646
 647                                 unsigned port = atoi(tok);
 648                                 if (port == 0 || port > 0xffff) {
 649                                         continue;
 650                                 }
 651
 652                                 /* Keep the first port for mDNS service
 653                                  * registration.
 654                                  */
 655                                 if (dns_port == 0) {
 656                                         dns_port = port;
 657                                 }
 658
 659                                 /* open an incoming socket */
 660                                 if (!interpret_string_addr(&ss, sock_tok,
 661                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 662                                         continue;
 663                                 }
 664
 665                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 666                                         return false;
 667                                 }
 668                         }
 669                 }
 670         }
 671
 672         if (parent->sockets == NULL) {
 673                 DEBUG(0,("open_sockets_smbd: No "
 674                         "sockets available to bind to.\n"));
 675                 return false;
 676         }
 677
 678         /* Setup the main smbd so that we can get messages. Note that
 679            do this after starting listening. This is needed as when in
 680            clustered mode, ctdb won't allow us to start doing database
 681            operations until it has gone thru a full startup, which
 682            includes checking to see that smbd is listening. */
 683         claim_connection(NULL,"",
 684                          FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
 685
 686         if (!(event_add_idle(smbd_event_context(), NULL,
 687                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
 688                              "parent_housekeeping", parent_housekeeping_fn,
 689                              parent))) {
 690                 DEBUG(0, ("Could not add housekeeping event\n"));
 691                 exit(1);
 692         }
 693
 694         /* Listen to messages */
 695
 696         messaging_register(smbd_messaging_context(), NULL,
 697                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 698         messaging_register(smbd_messaging_context(), NULL,
 699                            MSG_SHUTDOWN, msg_exit_server);
 700         messaging_register(smbd_messaging_context(), NULL,
 701                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 702         messaging_register(smbd_messaging_context(), NULL,
 703                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 704         messaging_register(smbd_messaging_context(), NULL,
 705                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 706         messaging_register(smbd_messaging_context(), NULL,
 707                            MSG_DEBUG, smbd_msg_debug);
 708         brl_register_msgs(smbd_messaging_context());
 709
 710 #ifdef CLUSTER_SUPPORT
 711         if (lp_clustering()) {
 712                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 713         }
 714 #endif
 715
 716 #ifdef DEVELOPER
 717         messaging_register(smbd_messaging_context(), NULL,
 718                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 719 #endif
 720
 721         if (dns_port != 0) {
 722 #ifdef WITH_DNSSD_SUPPORT
 723                 smbd_setup_mdns_registration(smbd_event_context(),
 724                                              parent, dns_port);
 725 #endif
 726 #ifdef WITH_AVAHI_SUPPORT
 727                 void *avahi_conn;
 728
 729                 avahi_conn = avahi_start_register(
 730                         smbd_event_context(), smbd_event_context(), dns_port);
 731                 if (avahi_conn == NULL) {
 732                         DEBUG(10, ("avahi_start_register failed\n"));
 733                 }
 734 #endif
 735         }
 736
 737         return true;
 738 }
 739
 740 static void smbd_parent_loop(struct smbd_parent_context *parent)
 741 {
 742         /* now accept incoming connections - forking a new process
 743            for each incoming connection */
 744         DEBUG(2,("waiting for connections\n"));
 745         while (1) {
 746                 int ret;
 747                 TALLOC_CTX *frame = talloc_stackframe();
 748
 749                 ret = tevent_loop_once(smbd_event_context());
 750                 if (ret != 0) {
 751                         exit_server_cleanly("tevent_loop_once() error");
 752                 }
 753
 754                 TALLOC_FREE(frame);
 755         } /* end while 1 */
 756
 757 /* NOTREACHED   return True; */
 758 }
 759
 760 /***************************************************************************
 761  purge stale printers and reload from pre-populated pcap cache
 762 ***************************************************************************/
 763 void reload_printers(void)
 764 {
 765         int snum;
 766         int n_services = lp_numservices();
 767         int pnum = lp_servicenumber(PRINTERS_NAME);
 768         const char *pname;
 769
 770         SMB_ASSERT(pcap_cache_loaded());
 771
 772         DEBUG(10, ("reloading printer services from pcap cache\n"));
 773         for (snum = 0; snum < n_services; snum++) {
 774                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 775                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 776                                       lp_autoloaded(snum)))
 777                         continue;
 778
 779                 pname = lp_printername(snum);
 780                 if (!pcap_printername_ok(pname)) {
 781                         DEBUG(3, ("removing stale printer %s\n", pname));
 782
 783                         if (is_printer_published(NULL, snum, NULL))
 784                                 nt_printer_publish(NULL, snum, DSPRINT_UNPUBLISH);
 785                         del_a_printer(pname);
 786                         lp_killservice(snum);
 787                 }
 788         }
 789
 790         load_printers();
 791 }
 792
 793 /****************************************************************************
 794  Reload the services file.
 795 **************************************************************************/
 796
 797 bool reload_services(bool test)
 798 {
 799         bool ret;
 800
 801         if (lp_loaded()) {
 802                 char *fname = lp_configfile();
 803                 if (file_exist(fname) &&
 804                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 805                         set_dyn_CONFIGFILE(fname);
 806                         test = False;
 807                 }
 808         }
 809
 810         reopen_logs();
 811
 812         if (test && !lp_file_list_changed())
 813                 return(True);
 814
 815         lp_killunused(conn_snum_used);
 816
 817         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 818
 819         pcap_cache_reload(&reload_printers);
 820
 821         /* perhaps the config filename is now set */
 822         if (!test)
 823                 reload_services(True);
 824
 825         reopen_logs();
 826
 827         load_interfaces();
 828
 829         if (smbd_server_fd() != -1) {
 830                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 831                 set_socket_options(smbd_server_fd(), lp_socket_options());
 832         }
 833
 834         mangle_reset_cache();
 835         reset_stat_cache();
 836
 837         /* this forces service parameters to be flushed */
 838         set_current_service(NULL,0,True);
 839
 840         return(ret);
 841 }
 842
 843 /****************************************************************************
 844  Exit the server.
 845 ****************************************************************************/
 846
 847 /* Reasons for shutting down a server process. */
 848 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 849
 850 static void exit_server_common(enum server_exit_reason how,
 851         const char *const reason) _NORETURN_;
 852
 853 static void exit_server_common(enum server_exit_reason how,
 854         const char *const reason)
 855 {
 856         bool had_open_conn = false;
 857         struct smbd_server_connection *sconn = smbd_server_conn;
 858
 859         if (!exit_firsttime)
 860                 exit(0);
 861         exit_firsttime = false;
 862
 863         change_to_root_user();
 864
 865         if (sconn && sconn->smb1.negprot.auth_context) {
 866                 struct auth_context *a = sconn->smb1.negprot.auth_context;
 867                 a->free(&sconn->smb1.negprot.auth_context);
 868         }
 869
 870         if (sconn) {
 871                 had_open_conn = conn_close_all(sconn);
 872                 invalidate_all_vuids(sconn);
 873         }
 874
 875         /* 3 second timeout. */
 876         print_notify_send_messages(smbd_messaging_context(), 3);
 877
 878         /* delete our entry in the connections database. */
 879         yield_connection(NULL,"");
 880
 881 #ifdef WITH_DFS
 882         if (dcelogin_atmost_once) {
 883                 dfs_unlogin();
 884         }
 885 #endif
 886
 887 #ifdef USE_DMAPI
 888         /* Destroy Samba DMAPI session only if we are master smbd process */
 889         if (am_parent) {
 890                 if (!dmapi_destroy_session()) {
 891                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 892                 }
 893         }
 894 #endif
 895
 896         locking_end();
 897         printing_end();
 898
 899         /*
 900          * we need to force the order of freeing the following,
 901          * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
 902          */
 903         sconn = NULL;
 904         TALLOC_FREE(smbd_server_conn);
 905         TALLOC_FREE(smbd_msg_ctx);
 906         TALLOC_FREE(smbd_event_ctx);
 907
 908         if (how != SERVER_EXIT_NORMAL) {
 909                 int oldlevel = DEBUGLEVEL;
 910
 911                 DEBUGLEVEL = 10;
 912
 913                 DEBUGSEP(0);
 914                 DEBUG(0,("Abnormal server exit: %s\n",
 915                         reason ? reason : "no explanation provided"));
 916                 DEBUGSEP(0);
 917
 918                 log_stack_trace();
 919
 920                 DEBUGLEVEL = oldlevel;
 921                 dump_core();
 922
 923         } else {
 924                 DEBUG(3,("Server exit (%s)\n",
 925                         (reason ? reason : "normal exit")));
 926                 if (am_parent) {
 927                         pidfile_unlink();
 928                 }
 929                 gencache_stabilize();
 930         }
 931
 932         /* if we had any open SMB connections when we exited then we
 933            need to tell the parent smbd so that it can trigger a retry
 934            of any locks we may have been holding or open files we were
 935            blocking */
 936         if (had_open_conn) {
 937                 exit(1);
 938         } else {
 939                 exit(0);
 940         }
 941 }
 942
 943 void exit_server(const char *const explanation)
 944 {
 945         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 946 }
 947
 948 void exit_server_cleanly(const char *const explanation)
 949 {
 950         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 951 }
 952
 953 void exit_server_fault(void)
 954 {
 955         exit_server("critical server fault");
 956 }
 957
 958 /****************************************************************************
 959  Initialise connect, service and file structs.
 960 ****************************************************************************/
 961
 962 static bool init_structs(void )
 963 {
 964         /*
 965          * Set the machine NETBIOS name if not already
 966          * set from the config file.
 967          */
 968
 969         if (!init_names())
 970                 return False;
 971
 972         file_init();
 973
 974         if (!secrets_init())
 975                 return False;
 976
 977         return True;
 978 }
 979
 980 /****************************************************************************
 981  main program.
 982 ****************************************************************************/
 983
 984 /* Declare prototype for build_options() to avoid having to run it through
 985    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 986    prototype generation system is too complicated. */
 987
 988 extern void build_options(bool screen);
 989
 990  int main(int argc,const char *argv[])
 991 {
 992         /* shall I run as a daemon */
 993         bool is_daemon = false;
 994         bool interactive = false;
 995         bool Fork = true;
 996         bool no_process_group = false;
 997         bool log_stdout = false;
 998         char *ports = NULL;
 999         char *profile_level = NULL;
1000         int opt;
1001         poptContext pc;
1002         bool print_build_options = False;
1003         enum {
1004                 OPT_DAEMON = 1000,
1005                 OPT_INTERACTIVE,
1006                 OPT_FORK,
1007                 OPT_NO_PROCESS_GROUP,
1008                 OPT_LOG_STDOUT
1009         };
1010         struct poptOption long_options[] = {
1011         POPT_AUTOHELP
1012         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1013         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1014         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1015         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1016         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1017         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1018         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1019         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1020         POPT_COMMON_SAMBA
1021         POPT_COMMON_DYNCONFIG
1022         POPT_TABLEEND
1023         };
1024         struct smbd_parent_context *parent = NULL;
1025         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1026
1027         smbd_init_globals();
1028
1029         TimeInit();
1030
1031 #ifdef HAVE_SET_AUTH_PARAMETERS
1032         set_auth_parameters(argc,argv);
1033 #endif
1034
1035         pc = poptGetContext("smbd", argc, argv, long_options, 0);
1036         while((opt = poptGetNextOpt(pc)) != -1) {
1037                 switch (opt)  {
1038                 case OPT_DAEMON:
1039                         is_daemon = true;
1040                         break;
1041                 case OPT_INTERACTIVE:
1042                         interactive = true;
1043                         break;
1044                 case OPT_FORK:
1045                         Fork = false;
1046                         break;
1047                 case OPT_NO_PROCESS_GROUP:
1048                         no_process_group = true;
1049                         break;
1050                 case OPT_LOG_STDOUT:
1051                         log_stdout = true;
1052                         break;
1053                 case 'b':
1054                         print_build_options = True;
1055                         break;
1056                 default:
1057                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1058                                   poptBadOption(pc, 0), poptStrerror(opt));
1059                         poptPrintUsage(pc, stderr, 0);
1060                         exit(1);
1061                 }
1062         }
1063         poptFreeContext(pc);
1064
1065         if (interactive) {
1066                 Fork = False;
1067                 log_stdout = True;
1068         }
1069
1070         setup_logging(argv[0],log_stdout);
1071
1072         if (print_build_options) {
1073                 build_options(True); /* Display output to screen as well as debug */
1074                 exit(0);
1075         }
1076
1077         load_case_tables();
1078
1079 #ifdef HAVE_SETLUID
1080         /* needed for SecureWare on SCO */
1081         setluid(0);
1082 #endif
1083
1084         sec_init();
1085
1086         set_remote_machine_name("smbd", False);
1087
1088         if (interactive && (DEBUGLEVEL >= 9)) {
1089                 talloc_enable_leak_report();
1090         }
1091
1092         if (log_stdout && Fork) {
1093                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1094                 exit(1);
1095         }
1096
1097         /* we want to re-seed early to prevent time delays causing
1098            client problems at a later date. (tridge) */
1099         generate_random_buffer(NULL, 0);
1100
1101         /* make absolutely sure we run as root - to handle cases where people
1102            are crazy enough to have it setuid */
1103
1104         gain_root_privilege();
1105         gain_root_group_privilege();
1106
1107         fault_setup((void (*)(void *))exit_server_fault);
1108         dump_core_setup("smbd");
1109
1110         /* we are never interested in SIGPIPE */
1111         BlockSignals(True,SIGPIPE);
1112
1113 #if defined(SIGFPE)
1114         /* we are never interested in SIGFPE */
1115         BlockSignals(True,SIGFPE);
1116 #endif
1117
1118 #if defined(SIGUSR2)
1119         /* We are no longer interested in USR2 */
1120         BlockSignals(True,SIGUSR2);
1121 #endif
1122
1123         /* POSIX demands that signals are inherited. If the invoking process has
1124          * these signals masked, we will have problems, as we won't recieve them. */
1125         BlockSignals(False, SIGHUP);
1126         BlockSignals(False, SIGUSR1);
1127         BlockSignals(False, SIGTERM);
1128
1129         /* Ensure we leave no zombies until we
1130          * correctly set up child handling below. */
1131
1132         CatchChild();
1133
1134         /* we want total control over the permissions on created files,
1135            so set our umask to 0 */
1136         umask(0);
1137
1138         init_sec_ctx();
1139
1140         reopen_logs();
1141
1142         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1143         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1144
1145         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1146                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1147
1148         /* Output the build options to the debug log */
1149         build_options(False);
1150
1151         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1152                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1153                 exit(1);
1154         }
1155
1156         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1157                 DEBUG(0, ("error opening config file\n"));
1158                 exit(1);
1159         }
1160
1161         if (smbd_messaging_context() == NULL)
1162                 exit(1);
1163
1164         if (!reload_services(False))
1165                 return(-1);
1166
1167         init_structs();
1168
1169 #ifdef WITH_PROFILE
1170         if (!profile_setup(smbd_messaging_context(), False)) {
1171                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1172                 return -1;
1173         }
1174         if (profile_level != NULL) {
1175                 int pl = atoi(profile_level);
1176                 struct server_id src;
1177
1178                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1179                 src.pid = getpid();
1180                 set_profile_level(pl, src);
1181         }
1182 #endif
1183
1184         DEBUG(3,( "loaded services\n"));
1185
1186         if (!is_daemon && !is_a_socket(0)) {
1187                 if (!interactive)
1188                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1189
1190                 /*
1191                  * Setting is_daemon here prevents us from eventually calling
1192                  * the open_sockets_inetd()
1193                  */
1194
1195                 is_daemon = True;
1196         }
1197
1198         if (is_daemon && !interactive) {
1199                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1200                 become_daemon(Fork, no_process_group);
1201         }
1202
1203 #if HAVE_SETPGID
1204         /*
1205          * If we're interactive we want to set our own process group for
1206          * signal management.
1207          */
1208         if (interactive && !no_process_group)
1209                 setpgid( (pid_t)0, (pid_t)0);
1210 #endif
1211
1212         if (!directory_exist(lp_lockdir()))
1213                 mkdir(lp_lockdir(), 0755);
1214
1215         if (is_daemon)
1216                 pidfile_create("smbd");
1217
1218         if (!NT_STATUS_IS_OK(reinit_after_fork(smbd_messaging_context(),
1219                              smbd_event_context(), false))) {
1220                 DEBUG(0,("reinit_after_fork() failed\n"));
1221                 exit(1);
1222         }
1223
1224         smbd_setup_sig_term_handler();
1225         smbd_setup_sig_hup_handler();
1226
1227         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1228
1229         if (smbd_memcache() == NULL) {
1230                 exit(1);
1231         }
1232
1233         memcache_set_global(smbd_memcache());
1234
1235         /* Initialise the password backed before the global_sam_sid
1236            to ensure that we fetch from ldap before we make a domain sid up */
1237
1238         if(!initialize_password_db(False, smbd_event_context()))
1239                 exit(1);
1240
1241         if (!secrets_init()) {
1242                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1243                 exit(1);
1244         }
1245
1246         if(!get_global_sam_sid()) {
1247                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1248                 exit(1);
1249         }
1250
1251         if (!session_init())
1252                 exit(1);
1253
1254         if (!connections_init(True))
1255                 exit(1);
1256
1257         if (!locking_init())
1258                 exit(1);
1259
1260         namecache_enable();
1261
1262         if (!W_ERROR_IS_OK(registry_init_full()))
1263                 exit(1);
1264
1265 #if 0
1266         if (!init_svcctl_db())
1267                 exit(1);
1268 #endif
1269
1270         if (!print_backend_init(smbd_messaging_context()))
1271                 exit(1);
1272
1273         if (!init_guest_info()) {
1274                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1275                 return -1;
1276         }
1277
1278         /* Open the share_info.tdb here, so we don't have to open
1279            after the fork on every single connection.  This is a small
1280            performance improvment and reduces the total number of system
1281            fds used. */
1282         if (!share_info_db_init()) {
1283                 DEBUG(0,("ERROR: failed to load share info db.\n"));
1284                 exit(1);
1285         }
1286
1287         /* only start the background queue daemon if we are
1288            running as a daemon -- bad things will happen if
1289            smbd is launched via inetd and we fork a copy of
1290            ourselves here */
1291
1292         if (is_daemon && !interactive
1293             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1294                 start_background_queue();
1295         }
1296
1297         if (!is_daemon) {
1298                 /* inetd mode */
1299                 TALLOC_FREE(frame);
1300
1301                 /* Started from inetd. fd 0 is the socket. */
1302                 /* We will abort gracefully when the client or remote system
1303                    goes away */
1304                 smbd_set_server_fd(dup(0));
1305
1306                 /* close our standard file descriptors */
1307                 close_low_fds(False); /* Don't close stderr */
1308
1309 #ifdef HAVE_ATEXIT
1310                 atexit(killkids);
1311 #endif
1312
1313                 /* Stop zombies */
1314                 smbd_setup_sig_chld_handler();
1315
1316                 smbd_process();
1317
1318                 exit_server_cleanly(NULL);
1319                 return(0);
1320         }
1321
1322         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1323         if (!parent) {
1324                 exit_server("talloc(struct smbd_parent_context) failed");
1325         }
1326         parent->interactive = interactive;
1327
1328         if (!open_sockets_smbd(parent, ports))
1329                 exit_server("open_sockets_smbd() failed");
1330
1331         TALLOC_FREE(frame);
1332         /* make sure we always have a valid stackframe */
1333         frame = talloc_stackframe();
1334
1335         smbd_parent_loop(parent);
1336
1337         exit_server_cleanly(NULL);
1338         TALLOC_FREE(frame);
1339         return(0);
1340 }