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