source3/smbd/server.c

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