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                 smbd_setup_mdns_registration(smbd_event_context(),
 647                                              parent, dns_port);
 648         }
 649
 650         return true;
 651 }
 652
 653 static void smbd_parent_loop(struct smbd_parent_context *parent)
 654 {
 655         /* now accept incoming connections - forking a new process
 656            for each incoming connection */
 657         DEBUG(2,("waiting for connections\n"));
 658         while (1) {
 659                 int ret;
 660                 TALLOC_CTX *frame = talloc_stackframe();
 661
 662                 ret = tevent_loop_once(smbd_event_context());
 663                 if (ret != 0) {
 664                         exit_server_cleanly("tevent_loop_once() error");
 665                 }
 666
 667                 TALLOC_FREE(frame);
 668         } /* end while 1 */
 669
 670 /* NOTREACHED   return True; */
 671 }
 672
 673 /****************************************************************************
 674  Reload printers
 675 **************************************************************************/
 676 void reload_printers(void)
 677 {
 678         int snum;
 679         int n_services = lp_numservices();
 680         int pnum = lp_servicenumber(PRINTERS_NAME);
 681         const char *pname;
 682
 683         pcap_cache_reload();
 684
 685         /* remove stale printers */
 686         for (snum = 0; snum < n_services; snum++) {
 687                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 688                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 689                                       lp_autoloaded(snum)))
 690                         continue;
 691
 692                 pname = lp_printername(snum);
 693                 if (!pcap_printername_ok(pname)) {
 694                         DEBUG(3, ("removing stale printer %s\n", pname));
 695
 696                         if (is_printer_published(NULL, snum, NULL))
 697                                 nt_printer_publish(NULL, snum, DSPRINT_UNPUBLISH);
 698                         del_a_printer(pname);
 699                         lp_killservice(snum);
 700                 }
 701         }
 702
 703         load_printers();
 704 }
 705
 706 /****************************************************************************
 707  Reload the services file.
 708 **************************************************************************/
 709
 710 bool reload_services(bool test)
 711 {
 712         bool ret;
 713
 714         if (lp_loaded()) {
 715                 char *fname = lp_configfile();
 716                 if (file_exist(fname) &&
 717                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 718                         set_dyn_CONFIGFILE(fname);
 719                         test = False;
 720                 }
 721         }
 722
 723         reopen_logs();
 724
 725         if (test && !lp_file_list_changed())
 726                 return(True);
 727
 728         lp_killunused(conn_snum_used);
 729
 730         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 731
 732         reload_printers();
 733
 734         /* perhaps the config filename is now set */
 735         if (!test)
 736                 reload_services(True);
 737
 738         reopen_logs();
 739
 740         load_interfaces();
 741
 742         if (smbd_server_fd() != -1) {
 743                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 744                 set_socket_options(smbd_server_fd(), lp_socket_options());
 745         }
 746
 747         mangle_reset_cache();
 748         reset_stat_cache();
 749
 750         /* this forces service parameters to be flushed */
 751         set_current_service(NULL,0,True);
 752
 753         return(ret);
 754 }
 755
 756 /****************************************************************************
 757  Exit the server.
 758 ****************************************************************************/
 759
 760 /* Reasons for shutting down a server process. */
 761 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 762
 763 static void exit_server_common(enum server_exit_reason how,
 764         const char *const reason) _NORETURN_;
 765
 766 static void exit_server_common(enum server_exit_reason how,
 767         const char *const reason)
 768 {
 769         bool had_open_conn;
 770
 771         if (!exit_firsttime)
 772                 exit(0);
 773         exit_firsttime = false;
 774
 775         change_to_root_user();
 776
 777         if (negprot_global_auth_context) {
 778                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 779         }
 780
 781         had_open_conn = conn_close_all();
 782
 783         invalidate_all_vuids();
 784
 785         /* 3 second timeout. */
 786         print_notify_send_messages(smbd_messaging_context(), 3);
 787
 788         /* delete our entry in the connections database. */
 789         yield_connection(NULL,"");
 790
 791 #ifdef WITH_DFS
 792         if (dcelogin_atmost_once) {
 793                 dfs_unlogin();
 794         }
 795 #endif
 796
 797 #ifdef USE_DMAPI
 798         /* Destroy Samba DMAPI session only if we are master smbd process */
 799         if (am_parent) {
 800                 if (!dmapi_destroy_session()) {
 801                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 802                 }
 803         }
 804 #endif
 805
 806         locking_end();
 807         printing_end();
 808
 809         if (how != SERVER_EXIT_NORMAL) {
 810                 int oldlevel = DEBUGLEVEL;
 811
 812                 DEBUGLEVEL = 10;
 813
 814                 DEBUGSEP(0);
 815                 DEBUG(0,("Abnormal server exit: %s\n",
 816                         reason ? reason : "no explanation provided"));
 817                 DEBUGSEP(0);
 818
 819                 log_stack_trace();
 820
 821                 DEBUGLEVEL = oldlevel;
 822                 dump_core();
 823
 824         } else {
 825                 DEBUG(3,("Server exit (%s)\n",
 826                         (reason ? reason : "normal exit")));
 827         }
 828
 829         /* if we had any open SMB connections when we exited then we
 830            need to tell the parent smbd so that it can trigger a retry
 831            of any locks we may have been holding or open files we were
 832            blocking */
 833         if (had_open_conn) {
 834                 exit(1);
 835         } else {
 836                 exit(0);
 837         }
 838 }
 839
 840 void exit_server(const char *const explanation)
 841 {
 842         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 843 }
 844
 845 void exit_server_cleanly(const char *const explanation)
 846 {
 847         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 848 }
 849
 850 void exit_server_fault(void)
 851 {
 852         exit_server("critical server fault");
 853 }
 854
 855 /****************************************************************************
 856  Initialise connect, service and file structs.
 857 ****************************************************************************/
 858
 859 static bool init_structs(void )
 860 {
 861         /*
 862          * Set the machine NETBIOS name if not already
 863          * set from the config file.
 864          */
 865
 866         if (!init_names())
 867                 return False;
 868
 869         conn_init();
 870
 871         file_init();
 872
 873         init_dptrs();
 874
 875         if (!secrets_init())
 876                 return False;
 877
 878         return True;
 879 }
 880
 881 /****************************************************************************
 882  main program.
 883 ****************************************************************************/
 884
 885 /* Declare prototype for build_options() to avoid having to run it through
 886    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 887    prototype generation system is too complicated. */
 888
 889 extern void build_options(bool screen);
 890
 891  int main(int argc,const char *argv[])
 892 {
 893         /* shall I run as a daemon */
 894         bool is_daemon = false;
 895         bool interactive = false;
 896         bool Fork = true;
 897         bool no_process_group = false;
 898         bool log_stdout = false;
 899         char *ports = NULL;
 900         char *profile_level = NULL;
 901         int opt;
 902         poptContext pc;
 903         bool print_build_options = False;
 904         enum {
 905                 OPT_DAEMON = 1000,
 906                 OPT_INTERACTIVE,
 907                 OPT_FORK,
 908                 OPT_NO_PROCESS_GROUP,
 909                 OPT_LOG_STDOUT
 910         };
 911         struct poptOption long_options[] = {
 912         POPT_AUTOHELP
 913         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 914         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 915         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 916         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 917         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 918         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 919         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 920         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 921         POPT_COMMON_SAMBA
 922         POPT_COMMON_DYNCONFIG
 923         POPT_TABLEEND
 924         };
 925         struct smbd_parent_context *parent = NULL;
 926         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 927
 928         smbd_init_globals();
 929
 930         TimeInit();
 931
 932 #ifdef HAVE_SET_AUTH_PARAMETERS
 933         set_auth_parameters(argc,argv);
 934 #endif
 935
 936         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 937         while((opt = poptGetNextOpt(pc)) != -1) {
 938                 switch (opt)  {
 939                 case OPT_DAEMON:
 940                         is_daemon = true;
 941                         break;
 942                 case OPT_INTERACTIVE:
 943                         interactive = true;
 944                         break;
 945                 case OPT_FORK:
 946                         Fork = false;
 947                         break;
 948                 case OPT_NO_PROCESS_GROUP:
 949                         no_process_group = true;
 950                         break;
 951                 case OPT_LOG_STDOUT:
 952                         log_stdout = true;
 953                         break;
 954                 case 'b':
 955                         print_build_options = True;
 956                         break;
 957                 default:
 958                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 959                                   poptBadOption(pc, 0), poptStrerror(opt));
 960                         poptPrintUsage(pc, stderr, 0);
 961                         exit(1);
 962                 }
 963         }
 964         poptFreeContext(pc);
 965
 966         if (interactive) {
 967                 Fork = False;
 968                 log_stdout = True;
 969         }
 970
 971         setup_logging(argv[0],log_stdout);
 972
 973         if (print_build_options) {
 974                 build_options(True); /* Display output to screen as well as debug */
 975                 exit(0);
 976         }
 977
 978         load_case_tables();
 979
 980 #ifdef HAVE_SETLUID
 981         /* needed for SecureWare on SCO */
 982         setluid(0);
 983 #endif
 984
 985         sec_init();
 986
 987         set_remote_machine_name("smbd", False);
 988
 989         if (interactive && (DEBUGLEVEL >= 9)) {
 990                 talloc_enable_leak_report();
 991         }
 992
 993         if (log_stdout && Fork) {
 994                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 995                 exit(1);
 996         }
 997
 998         /* we want to re-seed early to prevent time delays causing
 999            client problems at a later date. (tridge) */
1000         generate_random_buffer(NULL, 0);
1001
1002         /* make absolutely sure we run as root - to handle cases where people
1003            are crazy enough to have it setuid */
1004
1005         gain_root_privilege();
1006         gain_root_group_privilege();
1007
1008         fault_setup((void (*)(void *))exit_server_fault);
1009         dump_core_setup("smbd");
1010
1011         /* we are never interested in SIGPIPE */
1012         BlockSignals(True,SIGPIPE);
1013
1014 #if defined(SIGFPE)
1015         /* we are never interested in SIGFPE */
1016         BlockSignals(True,SIGFPE);
1017 #endif
1018
1019 #if defined(SIGUSR2)
1020         /* We are no longer interested in USR2 */
1021         BlockSignals(True,SIGUSR2);
1022 #endif
1023
1024         /* POSIX demands that signals are inherited. If the invoking process has
1025          * these signals masked, we will have problems, as we won't recieve them. */
1026         BlockSignals(False, SIGHUP);
1027         BlockSignals(False, SIGUSR1);
1028         BlockSignals(False, SIGTERM);
1029
1030         /* we want total control over the permissions on created files,
1031            so set our umask to 0 */
1032         umask(0);
1033
1034         init_sec_ctx();
1035
1036         reopen_logs();
1037
1038         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1039         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1040
1041         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1042                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1043
1044         /* Output the build options to the debug log */
1045         build_options(False);
1046
1047         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1048                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1049                 exit(1);
1050         }
1051
1052         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1053                 DEBUG(0, ("error opening config file\n"));
1054                 exit(1);
1055         }
1056
1057         if (smbd_messaging_context() == NULL)
1058                 exit(1);
1059
1060         if (!reload_services(False))
1061                 return(-1);
1062
1063         init_structs();
1064
1065 #ifdef WITH_PROFILE
1066         if (!profile_setup(smbd_messaging_context(), False)) {
1067                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1068                 return -1;
1069         }
1070         if (profile_level != NULL) {
1071                 int pl = atoi(profile_level);
1072                 struct server_id src;
1073
1074                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1075                 src.pid = getpid();
1076                 set_profile_level(pl, src);
1077         }
1078 #endif
1079
1080         DEBUG(3,( "loaded services\n"));
1081
1082         if (!is_daemon && !is_a_socket(0)) {
1083                 if (!interactive)
1084                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1085
1086                 /*
1087                  * Setting is_daemon here prevents us from eventually calling
1088                  * the open_sockets_inetd()
1089                  */
1090
1091                 is_daemon = True;
1092         }
1093
1094         if (is_daemon && !interactive) {
1095                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1096                 become_daemon(Fork, no_process_group);
1097         }
1098
1099 #if HAVE_SETPGID
1100         /*
1101          * If we're interactive we want to set our own process group for
1102          * signal management.
1103          */
1104         if (interactive && !no_process_group)
1105                 setpgid( (pid_t)0, (pid_t)0);
1106 #endif
1107
1108         if (!directory_exist(lp_lockdir()))
1109                 mkdir(lp_lockdir(), 0755);
1110
1111         if (is_daemon)
1112                 pidfile_create("smbd");
1113
1114         if (!reinit_after_fork(smbd_messaging_context(),
1115                                smbd_event_context(), false)) {
1116                 DEBUG(0,("reinit_after_fork() failed\n"));
1117                 exit(1);
1118         }
1119
1120         smbd_setup_sig_term_handler();
1121         smbd_setup_sig_hup_handler();
1122
1123         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1124
1125         if (smbd_memcache() == NULL) {
1126                 exit(1);
1127         }
1128
1129         memcache_set_global(smbd_memcache());
1130
1131         /* Initialise the password backed before the global_sam_sid
1132            to ensure that we fetch from ldap before we make a domain sid up */
1133
1134         if(!initialize_password_db(False, smbd_event_context()))
1135                 exit(1);
1136
1137         if (!secrets_init()) {
1138                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1139                 exit(1);
1140         }
1141
1142         if(!get_global_sam_sid()) {
1143                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1144                 exit(1);
1145         }
1146
1147         if (!session_init())
1148                 exit(1);
1149
1150         if (!connections_init(True))
1151                 exit(1);
1152
1153         if (!locking_init())
1154                 exit(1);
1155
1156         namecache_enable();
1157
1158         if (!W_ERROR_IS_OK(registry_init_full()))
1159                 exit(1);
1160
1161 #if 0
1162         if (!init_svcctl_db())
1163                 exit(1);
1164 #endif
1165
1166         if (!print_backend_init(smbd_messaging_context()))
1167                 exit(1);
1168
1169         if (!init_guest_info()) {
1170                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1171                 return -1;
1172         }
1173
1174         /* only start the background queue daemon if we are
1175            running as a daemon -- bad things will happen if
1176            smbd is launched via inetd and we fork a copy of
1177            ourselves here */
1178
1179         if (is_daemon && !interactive
1180             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1181                 start_background_queue();
1182         }
1183
1184         if (!is_daemon) {
1185                 /* inetd mode */
1186                 TALLOC_FREE(frame);
1187
1188                 /* Started from inetd. fd 0 is the socket. */
1189                 /* We will abort gracefully when the client or remote system
1190                    goes away */
1191                 smbd_set_server_fd(dup(0));
1192
1193                 /* close our standard file descriptors */
1194                 close_low_fds(False); /* Don't close stderr */
1195
1196                 smbd_process();
1197
1198                 exit_server_cleanly(NULL);
1199                 return(0);
1200         }
1201
1202         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1203         if (!parent) {
1204                 exit_server("talloc(struct smbd_parent_context) failed");
1205         }
1206         parent->interactive = interactive;
1207
1208         if (!open_sockets_smbd(parent, ports))
1209                 exit_server("open_sockets_smbd() failed");
1210
1211         TALLOC_FREE(frame);
1212
1213         smbd_parent_loop(parent);
1214
1215         exit_server_cleanly(NULL);
1216         return(0);
1217 }