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                 NTSTATUS status = NT_STATUS_OK;
 360                 /* Child code ... */
 361                 am_parent = 0;
 362
 363                 /* Stop zombies, the parent explicitly handles
 364                  * them, counting worker smbds. */
 365                 CatchChild();
 366
 367                 /* close our standard file
 368                    descriptors */
 369                 close_low_fds(False);
 370
 371                 /*
 372                  * Can't use TALLOC_FREE here. Nulling out the argument to it
 373                  * would overwrite memory we've just freed.
 374                  */
 375                 talloc_free(s->parent);
 376                 s = NULL;
 377
 378                 status = reinit_after_fork(smbd_messaging_context(),
 379                                            smbd_event_context(), true);
 380                 if (!NT_STATUS_IS_OK(status)) {
 381                         if (NT_STATUS_EQUAL(status,
 382                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
 383                                 DEBUG(0,("child process cannot initialize "
 384                                          "because too many files are open\n"));
 385                                 goto exit;
 386                         }
 387                         DEBUG(0,("reinit_after_fork() failed\n"));
 388                         smb_panic("reinit_after_fork() failed");
 389                 }
 390
 391                 smbd_setup_sig_term_handler();
 392                 smbd_setup_sig_hup_handler();
 393
 394                 smbd_process();
 395          exit:
 396                 exit_server_cleanly("end of child");
 397                 return;
 398         } else if (pid < 0) {
 399                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
 400                          strerror(errno)));
 401         }
 402
 403         /* The parent doesn't need this socket */
 404         close(smbd_server_fd());
 405
 406         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 407                 Clear the closed fd info out of server_fd --
 408                 and more importantly, out of client_fd in
 409                 util_sock.c, to avoid a possible
 410                 getpeername failure if we reopen the logs
 411                 and use %I in the filename.
 412         */
 413
 414         smbd_set_server_fd(-1);
 415
 416         if (pid != 0) {
 417                 add_child_pid(pid);
 418         }
 419
 420         /* Force parent to check log size after
 421          * spawning child.  Fix from
 422          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 423          * parent smbd will log to logserver.smb.  It
 424          * writes only two messages for each child
 425          * started/finished. But each child writes,
 426          * say, 50 messages also in logserver.smb,
 427          * begining with the debug_count of the
 428          * parent, before the child opens its own log
 429          * file logserver.client. In a worst case
 430          * scenario the size of logserver.smb would be
 431          * checked after about 50*50=2500 messages
 432          * (ca. 100kb).
 433          * */
 434         force_check_log_size();
 435 }
 436
 437 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
 438                                  const struct sockaddr_storage *ifss,
 439                                  uint16_t port)
 440 {
 441         struct smbd_open_socket *s;
 442
 443         s = talloc(parent, struct smbd_open_socket);
 444         if (!s) {
 445                 return false;
 446         }
 447
 448         s->parent = parent;
 449         s->fd = open_socket_in(SOCK_STREAM,
 450                                port,
 451                                parent->sockets == NULL ? 0 : 2,
 452                                ifss,
 453                                true);
 454         if (s->fd == -1) {
 455                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
 456                         "%s\n", strerror(errno)));
 457                 TALLOC_FREE(s);
 458                 /*
 459                  * We ignore an error here, as we've done before
 460                  */
 461                 return true;
 462         }
 463
 464         /* ready to listen */
 465         set_socket_options(s->fd, "SO_KEEPALIVE");
 466         set_socket_options(s->fd, lp_socket_options());
 467
 468         /* Set server socket to
 469          * non-blocking for the accept. */
 470         set_blocking(s->fd, False);
 471
 472         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
 473                 DEBUG(0,("open_sockets_smbd: listen: "
 474                         "%s\n", strerror(errno)));
 475                         close(s->fd);
 476                 TALLOC_FREE(s);
 477                 return false;
 478         }
 479
 480         s->fde = tevent_add_fd(smbd_event_context(),
 481                                s,
 482                                s->fd, TEVENT_FD_READ,
 483                                smbd_accept_connection,
 484                                s);
 485         if (!s->fde) {
 486                 DEBUG(0,("open_sockets_smbd: "
 487                          "tevent_add_fd: %s\n",
 488                          strerror(errno)));
 489                 close(s->fd);
 490                 TALLOC_FREE(s);
 491                 return false;
 492         }
 493         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
 494
 495         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
 496
 497         return true;
 498 }
 499
 500 /****************************************************************************
 501  Open the socket communication.
 502 ****************************************************************************/
 503
 504 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 505                               const char *smb_ports)
 506 {
 507         int num_interfaces = iface_count();
 508         int i;
 509         char *ports;
 510         unsigned dns_port = 0;
 511
 512 #ifdef HAVE_ATEXIT
 513         atexit(killkids);
 514 #endif
 515
 516         /* Stop zombies */
 517         smbd_setup_sig_chld_handler();
 518
 519         /* use a reasonable default set of ports - listing on 445 and 139 */
 520         if (!smb_ports) {
 521                 ports = lp_smb_ports();
 522                 if (!ports || !*ports) {
 523                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 524                 } else {
 525                         ports = talloc_strdup(talloc_tos(), ports);
 526                 }
 527         } else {
 528                 ports = talloc_strdup(talloc_tos(), smb_ports);
 529         }
 530
 531         if (lp_interfaces() && lp_bind_interfaces_only()) {
 532                 /* We have been given an interfaces line, and been
 533                    told to only bind to those interfaces. Create a
 534                    socket per interface and bind to only these.
 535                 */
 536
 537                 /* Now open a listen socket for each of the
 538                    interfaces. */
 539                 for(i = 0; i < num_interfaces; i++) {
 540                         const struct sockaddr_storage *ifss =
 541                                         iface_n_sockaddr_storage(i);
 542                         char *tok;
 543                         const char *ptr;
 544
 545                         if (ifss == NULL) {
 546                                 DEBUG(0,("open_sockets_smbd: "
 547                                         "interface %d has NULL IP address !\n",
 548                                         i));
 549                                 continue;
 550                         }
 551
 552                         for (ptr=ports;
 553                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 554                                 unsigned port = atoi(tok);
 555                                 if (port == 0 || port > 0xffff) {
 556                                         continue;
 557                                 }
 558
 559                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 560                                         return false;
 561                                 }
 562                         }
 563                 }
 564         } else {
 565                 /* Just bind to 0.0.0.0 - accept connections
 566                    from anywhere. */
 567
 568                 char *tok;
 569                 const char *ptr;
 570                 const char *sock_addr = lp_socket_address();
 571                 char *sock_tok;
 572                 const char *sock_ptr;
 573
 574                 if (strequal(sock_addr, "0.0.0.0") ||
 575                     strequal(sock_addr, "::")) {
 576 #if HAVE_IPV6
 577                         sock_addr = "::,0.0.0.0";
 578 #else
 579                         sock_addr = "0.0.0.0";
 580 #endif
 581                 }
 582
 583                 for (sock_ptr=sock_addr;
 584                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 585                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 586                                 struct sockaddr_storage ss;
 587
 588                                 unsigned port = atoi(tok);
 589                                 if (port == 0 || port > 0xffff) {
 590                                         continue;
 591                                 }
 592
 593                                 /* Keep the first port for mDNS service
 594                                  * registration.
 595                                  */
 596                                 if (dns_port == 0) {
 597                                         dns_port = port;
 598                                 }
 599
 600                                 /* open an incoming socket */
 601                                 if (!interpret_string_addr(&ss, sock_tok,
 602                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 603                                         continue;
 604                                 }
 605
 606                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 607                                         return false;
 608                                 }
 609                         }
 610                 }
 611         }
 612
 613         if (parent->sockets == NULL) {
 614                 DEBUG(0,("open_sockets_smbd: No "
 615                         "sockets available to bind to.\n"));
 616                 return false;
 617         }
 618
 619         /* Setup the main smbd so that we can get messages. Note that
 620            do this after starting listening. This is needed as when in
 621            clustered mode, ctdb won't allow us to start doing database
 622            operations until it has gone thru a full startup, which
 623            includes checking to see that smbd is listening. */
 624         claim_connection(NULL,"",
 625                          FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
 626
 627         /* Listen to messages */
 628
 629         messaging_register(smbd_messaging_context(), NULL,
 630                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 631         messaging_register(smbd_messaging_context(), NULL,
 632                            MSG_SHUTDOWN, msg_exit_server);
 633         messaging_register(smbd_messaging_context(), NULL,
 634                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 635         messaging_register(smbd_messaging_context(), NULL,
 636                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 637         messaging_register(smbd_messaging_context(), NULL,
 638                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 639         brl_register_msgs(smbd_messaging_context());
 640
 641 #ifdef CLUSTER_SUPPORT
 642         if (lp_clustering()) {
 643                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 644         }
 645 #endif
 646
 647 #ifdef DEVELOPER
 648         messaging_register(smbd_messaging_context(), NULL,
 649                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 650 #endif
 651
 652         if (dns_port != 0) {
 653 #ifdef WITH_DNSSD_SUPPORT
 654                 smbd_setup_mdns_registration(smbd_event_context(),
 655                                              parent, dns_port);
 656 #endif
 657 #ifdef WITH_AVAHI_SUPPORT
 658                 void *avahi_conn;
 659
 660                 avahi_conn = avahi_start_register(
 661                         smbd_event_context(), smbd_event_context(), dns_port);
 662                 if (avahi_conn == NULL) {
 663                         DEBUG(10, ("avahi_start_register failed\n"));
 664                 }
 665 #endif
 666         }
 667
 668         return true;
 669 }
 670
 671 static void smbd_parent_loop(struct smbd_parent_context *parent)
 672 {
 673         /* now accept incoming connections - forking a new process
 674            for each incoming connection */
 675         DEBUG(2,("waiting for connections\n"));
 676         while (1) {
 677                 int ret;
 678                 TALLOC_CTX *frame = talloc_stackframe();
 679
 680                 ret = tevent_loop_once(smbd_event_context());
 681                 if (ret != 0) {
 682                         exit_server_cleanly("tevent_loop_once() error");
 683                 }
 684
 685                 TALLOC_FREE(frame);
 686         } /* end while 1 */
 687
 688 /* NOTREACHED   return True; */
 689 }
 690
 691 /****************************************************************************
 692  Reload printers
 693 **************************************************************************/
 694 void reload_printers(void)
 695 {
 696         int snum;
 697         int n_services = lp_numservices();
 698         int pnum = lp_servicenumber(PRINTERS_NAME);
 699         const char *pname;
 700
 701         pcap_cache_reload();
 702
 703         /* remove stale printers */
 704         for (snum = 0; snum < n_services; snum++) {
 705                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 706                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 707                                       lp_autoloaded(snum)))
 708                         continue;
 709
 710                 pname = lp_printername(snum);
 711                 if (!pcap_printername_ok(pname)) {
 712                         DEBUG(3, ("removing stale printer %s\n", pname));
 713
 714                         if (is_printer_published(NULL, snum, NULL))
 715                                 nt_printer_publish(NULL, snum, DSPRINT_UNPUBLISH);
 716                         del_a_printer(pname);
 717                         lp_killservice(snum);
 718                 }
 719         }
 720
 721         load_printers();
 722 }
 723
 724 /****************************************************************************
 725  Reload the services file.
 726 **************************************************************************/
 727
 728 bool reload_services(bool test)
 729 {
 730         bool ret;
 731
 732         if (lp_loaded()) {
 733                 char *fname = lp_configfile();
 734                 if (file_exist(fname) &&
 735                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 736                         set_dyn_CONFIGFILE(fname);
 737                         test = False;
 738                 }
 739         }
 740
 741         reopen_logs();
 742
 743         if (test && !lp_file_list_changed())
 744                 return(True);
 745
 746         lp_killunused(conn_snum_used);
 747
 748         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 749
 750         reload_printers();
 751
 752         /* perhaps the config filename is now set */
 753         if (!test)
 754                 reload_services(True);
 755
 756         reopen_logs();
 757
 758         load_interfaces();
 759
 760         if (smbd_server_fd() != -1) {
 761                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 762                 set_socket_options(smbd_server_fd(), lp_socket_options());
 763         }
 764
 765         mangle_reset_cache();
 766         reset_stat_cache();
 767
 768         /* this forces service parameters to be flushed */
 769         set_current_service(NULL,0,True);
 770
 771         return(ret);
 772 }
 773
 774 /****************************************************************************
 775  Exit the server.
 776 ****************************************************************************/
 777
 778 /* Reasons for shutting down a server process. */
 779 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 780
 781 static void exit_server_common(enum server_exit_reason how,
 782         const char *const reason) _NORETURN_;
 783
 784 static void exit_server_common(enum server_exit_reason how,
 785         const char *const reason)
 786 {
 787         bool had_open_conn = false;
 788         struct smbd_server_connection *sconn = smbd_server_conn;
 789
 790         if (!exit_firsttime)
 791                 exit(0);
 792         exit_firsttime = false;
 793
 794         change_to_root_user();
 795
 796         if (sconn && sconn->smb1.negprot.auth_context) {
 797                 struct auth_context *a = sconn->smb1.negprot.auth_context;
 798                 a->free(&sconn->smb1.negprot.auth_context);
 799         }
 800
 801         if (sconn) {
 802                 had_open_conn = conn_close_all(sconn);
 803                 invalidate_all_vuids(sconn);
 804         }
 805
 806         /* 3 second timeout. */
 807         print_notify_send_messages(smbd_messaging_context(), 3);
 808
 809         /* delete our entry in the connections database. */
 810         yield_connection(NULL,"");
 811
 812 #ifdef WITH_DFS
 813         if (dcelogin_atmost_once) {
 814                 dfs_unlogin();
 815         }
 816 #endif
 817
 818 #ifdef USE_DMAPI
 819         /* Destroy Samba DMAPI session only if we are master smbd process */
 820         if (am_parent) {
 821                 if (!dmapi_destroy_session()) {
 822                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 823                 }
 824         }
 825 #endif
 826
 827         locking_end();
 828         printing_end();
 829
 830         /*
 831          * we need to force the order of freeing the following,
 832          * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
 833          */
 834         sconn = NULL;
 835         TALLOC_FREE(smbd_server_conn);
 836         TALLOC_FREE(smbd_msg_ctx);
 837         TALLOC_FREE(smbd_event_ctx);
 838
 839         if (how != SERVER_EXIT_NORMAL) {
 840                 int oldlevel = DEBUGLEVEL;
 841
 842                 DEBUGLEVEL = 10;
 843
 844                 DEBUGSEP(0);
 845                 DEBUG(0,("Abnormal server exit: %s\n",
 846                         reason ? reason : "no explanation provided"));
 847                 DEBUGSEP(0);
 848
 849                 log_stack_trace();
 850
 851                 DEBUGLEVEL = oldlevel;
 852                 dump_core();
 853
 854         } else {
 855                 DEBUG(3,("Server exit (%s)\n",
 856                         (reason ? reason : "normal exit")));
 857         }
 858
 859         /* if we had any open SMB connections when we exited then we
 860            need to tell the parent smbd so that it can trigger a retry
 861            of any locks we may have been holding or open files we were
 862            blocking */
 863         if (had_open_conn) {
 864                 exit(1);
 865         } else {
 866                 exit(0);
 867         }
 868 }
 869
 870 void exit_server(const char *const explanation)
 871 {
 872         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 873 }
 874
 875 void exit_server_cleanly(const char *const explanation)
 876 {
 877         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 878 }
 879
 880 void exit_server_fault(void)
 881 {
 882         exit_server("critical server fault");
 883 }
 884
 885 /****************************************************************************
 886  Initialise connect, service and file structs.
 887 ****************************************************************************/
 888
 889 static bool init_structs(void )
 890 {
 891         /*
 892          * Set the machine NETBIOS name if not already
 893          * set from the config file.
 894          */
 895
 896         if (!init_names())
 897                 return False;
 898
 899         file_init();
 900
 901         init_dptrs();
 902
 903         if (!secrets_init())
 904                 return False;
 905
 906         return True;
 907 }
 908
 909 /****************************************************************************
 910  main program.
 911 ****************************************************************************/
 912
 913 /* Declare prototype for build_options() to avoid having to run it through
 914    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 915    prototype generation system is too complicated. */
 916
 917 extern void build_options(bool screen);
 918
 919  int main(int argc,const char *argv[])
 920 {
 921         /* shall I run as a daemon */
 922         bool is_daemon = false;
 923         bool interactive = false;
 924         bool Fork = true;
 925         bool no_process_group = false;
 926         bool log_stdout = false;
 927         char *ports = NULL;
 928         char *profile_level = NULL;
 929         int opt;
 930         poptContext pc;
 931         bool print_build_options = False;
 932         enum {
 933                 OPT_DAEMON = 1000,
 934                 OPT_INTERACTIVE,
 935                 OPT_FORK,
 936                 OPT_NO_PROCESS_GROUP,
 937                 OPT_LOG_STDOUT
 938         };
 939         struct poptOption long_options[] = {
 940         POPT_AUTOHELP
 941         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 942         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 943         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 944         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 945         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 946         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 947         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 948         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 949         POPT_COMMON_SAMBA
 950         POPT_COMMON_DYNCONFIG
 951         POPT_TABLEEND
 952         };
 953         struct smbd_parent_context *parent = NULL;
 954         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 955
 956         smbd_init_globals();
 957
 958         TimeInit();
 959
 960 #ifdef HAVE_SET_AUTH_PARAMETERS
 961         set_auth_parameters(argc,argv);
 962 #endif
 963
 964         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 965         while((opt = poptGetNextOpt(pc)) != -1) {
 966                 switch (opt)  {
 967                 case OPT_DAEMON:
 968                         is_daemon = true;
 969                         break;
 970                 case OPT_INTERACTIVE:
 971                         interactive = true;
 972                         break;
 973                 case OPT_FORK:
 974                         Fork = false;
 975                         break;
 976                 case OPT_NO_PROCESS_GROUP:
 977                         no_process_group = true;
 978                         break;
 979                 case OPT_LOG_STDOUT:
 980                         log_stdout = true;
 981                         break;
 982                 case 'b':
 983                         print_build_options = True;
 984                         break;
 985                 default:
 986                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 987                                   poptBadOption(pc, 0), poptStrerror(opt));
 988                         poptPrintUsage(pc, stderr, 0);
 989                         exit(1);
 990                 }
 991         }
 992         poptFreeContext(pc);
 993
 994         if (interactive) {
 995                 Fork = False;
 996                 log_stdout = True;
 997         }
 998
 999         setup_logging(argv[0],log_stdout);
1000
1001         if (print_build_options) {
1002                 build_options(True); /* Display output to screen as well as debug */
1003                 exit(0);
1004         }
1005
1006         load_case_tables();
1007
1008 #ifdef HAVE_SETLUID
1009         /* needed for SecureWare on SCO */
1010         setluid(0);
1011 #endif
1012
1013         sec_init();
1014
1015         set_remote_machine_name("smbd", False);
1016
1017         if (interactive && (DEBUGLEVEL >= 9)) {
1018                 talloc_enable_leak_report();
1019         }
1020
1021         if (log_stdout && Fork) {
1022                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1023                 exit(1);
1024         }
1025
1026         /* we want to re-seed early to prevent time delays causing
1027            client problems at a later date. (tridge) */
1028         generate_random_buffer(NULL, 0);
1029
1030         /* make absolutely sure we run as root - to handle cases where people
1031            are crazy enough to have it setuid */
1032
1033         gain_root_privilege();
1034         gain_root_group_privilege();
1035
1036         fault_setup((void (*)(void *))exit_server_fault);
1037         dump_core_setup("smbd");
1038
1039         /* we are never interested in SIGPIPE */
1040         BlockSignals(True,SIGPIPE);
1041
1042 #if defined(SIGFPE)
1043         /* we are never interested in SIGFPE */
1044         BlockSignals(True,SIGFPE);
1045 #endif
1046
1047 #if defined(SIGUSR2)
1048         /* We are no longer interested in USR2 */
1049         BlockSignals(True,SIGUSR2);
1050 #endif
1051
1052         /* POSIX demands that signals are inherited. If the invoking process has
1053          * these signals masked, we will have problems, as we won't recieve them. */
1054         BlockSignals(False, SIGHUP);
1055         BlockSignals(False, SIGUSR1);
1056         BlockSignals(False, SIGTERM);
1057
1058         /* we want total control over the permissions on created files,
1059            so set our umask to 0 */
1060         umask(0);
1061
1062         init_sec_ctx();
1063
1064         reopen_logs();
1065
1066         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1067         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1068
1069         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1070                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1071
1072         /* Output the build options to the debug log */
1073         build_options(False);
1074
1075         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1076                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1077                 exit(1);
1078         }
1079
1080         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1081                 DEBUG(0, ("error opening config file\n"));
1082                 exit(1);
1083         }
1084
1085         if (smbd_messaging_context() == NULL)
1086                 exit(1);
1087
1088         if (!reload_services(False))
1089                 return(-1);
1090
1091         init_structs();
1092
1093 #ifdef WITH_PROFILE
1094         if (!profile_setup(smbd_messaging_context(), False)) {
1095                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1096                 return -1;
1097         }
1098         if (profile_level != NULL) {
1099                 int pl = atoi(profile_level);
1100                 struct server_id src;
1101
1102                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1103                 src.pid = getpid();
1104                 set_profile_level(pl, src);
1105         }
1106 #endif
1107
1108         DEBUG(3,( "loaded services\n"));
1109
1110         if (!is_daemon && !is_a_socket(0)) {
1111                 if (!interactive)
1112                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1113
1114                 /*
1115                  * Setting is_daemon here prevents us from eventually calling
1116                  * the open_sockets_inetd()
1117                  */
1118
1119                 is_daemon = True;
1120         }
1121
1122         if (is_daemon && !interactive) {
1123                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1124                 become_daemon(Fork, no_process_group);
1125         }
1126
1127 #if HAVE_SETPGID
1128         /*
1129          * If we're interactive we want to set our own process group for
1130          * signal management.
1131          */
1132         if (interactive && !no_process_group)
1133                 setpgid( (pid_t)0, (pid_t)0);
1134 #endif
1135
1136         if (!directory_exist(lp_lockdir()))
1137                 mkdir(lp_lockdir(), 0755);
1138
1139         if (is_daemon)
1140                 pidfile_create("smbd");
1141
1142         if (!NT_STATUS_IS_OK(reinit_after_fork(smbd_messaging_context(),
1143                              smbd_event_context(), false))) {
1144                 DEBUG(0,("reinit_after_fork() failed\n"));
1145                 exit(1);
1146         }
1147
1148         smbd_setup_sig_term_handler();
1149         smbd_setup_sig_hup_handler();
1150
1151         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1152
1153         if (smbd_memcache() == NULL) {
1154                 exit(1);
1155         }
1156
1157         memcache_set_global(smbd_memcache());
1158
1159         /* Initialise the password backed before the global_sam_sid
1160            to ensure that we fetch from ldap before we make a domain sid up */
1161
1162         if(!initialize_password_db(False, smbd_event_context()))
1163                 exit(1);
1164
1165         if (!secrets_init()) {
1166                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1167                 exit(1);
1168         }
1169
1170         if(!get_global_sam_sid()) {
1171                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1172                 exit(1);
1173         }
1174
1175         if (!session_init())
1176                 exit(1);
1177
1178         if (!connections_init(True))
1179                 exit(1);
1180
1181         if (!locking_init())
1182                 exit(1);
1183
1184         namecache_enable();
1185
1186         if (!W_ERROR_IS_OK(registry_init_full()))
1187                 exit(1);
1188
1189 #if 0
1190         if (!init_svcctl_db())
1191                 exit(1);
1192 #endif
1193
1194         if (!print_backend_init(smbd_messaging_context()))
1195                 exit(1);
1196
1197         if (!init_guest_info()) {
1198                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1199                 return -1;
1200         }
1201
1202         /* only start the background queue daemon if we are
1203            running as a daemon -- bad things will happen if
1204            smbd is launched via inetd and we fork a copy of
1205            ourselves here */
1206
1207         if (is_daemon && !interactive
1208             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1209                 start_background_queue();
1210         }
1211
1212         if (!is_daemon) {
1213                 /* inetd mode */
1214                 TALLOC_FREE(frame);
1215
1216                 /* Started from inetd. fd 0 is the socket. */
1217                 /* We will abort gracefully when the client or remote system
1218                    goes away */
1219                 smbd_set_server_fd(dup(0));
1220
1221                 /* close our standard file descriptors */
1222                 close_low_fds(False); /* Don't close stderr */
1223
1224                 smbd_process();
1225
1226                 exit_server_cleanly(NULL);
1227                 return(0);
1228         }
1229
1230         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1231         if (!parent) {
1232                 exit_server("talloc(struct smbd_parent_context) failed");
1233         }
1234         parent->interactive = interactive;
1235
1236         if (!open_sockets_smbd(parent, ports))
1237                 exit_server("open_sockets_smbd() failed");
1238
1239         TALLOC_FREE(frame);
1240
1241         smbd_parent_loop(parent);
1242
1243         exit_server_cleanly(NULL);
1244         return(0);
1245 }