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", 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                 TALLOC_FREE(s->parent);
 371                 s = NULL;
 372
 373                 if (!reinit_after_fork(
 374                             smbd_messaging_context(),
 375                             smbd_event_context(),
 376                             true)) {
 377                         DEBUG(0,("reinit_after_fork() failed\n"));
 378                         smb_panic("reinit_after_fork() failed");
 379                 }
 380
 381                 smbd_setup_sig_term_handler();
 382                 smbd_setup_sig_hup_handler();
 383
 384                 smbd_process();
 385                 exit_server_cleanly("end of child");
 386                 return;
 387         } else if (pid < 0) {
 388                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
 389                          strerror(errno)));
 390         }
 391
 392         /* The parent doesn't need this socket */
 393         close(smbd_server_fd());
 394
 395         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 396                 Clear the closed fd info out of server_fd --
 397                 and more importantly, out of client_fd in
 398                 util_sock.c, to avoid a possible
 399                 getpeername failure if we reopen the logs
 400                 and use %I in the filename.
 401         */
 402
 403         smbd_set_server_fd(-1);
 404
 405         if (pid != 0) {
 406                 add_child_pid(pid);
 407         }
 408
 409         /* Force parent to check log size after
 410          * spawning child.  Fix from
 411          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 412          * parent smbd will log to logserver.smb.  It
 413          * writes only two messages for each child
 414          * started/finished. But each child writes,
 415          * say, 50 messages also in logserver.smb,
 416          * begining with the debug_count of the
 417          * parent, before the child opens its own log
 418          * file logserver.client. In a worst case
 419          * scenario the size of logserver.smb would be
 420          * checked after about 50*50=2500 messages
 421          * (ca. 100kb).
 422          * */
 423         force_check_log_size();
 424 }
 425
 426 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
 427                                  const struct sockaddr_storage *ifss,
 428                                  uint16_t port)
 429 {
 430         struct smbd_open_socket *s;
 431
 432         s = talloc(parent, struct smbd_open_socket);
 433         if (!s) {
 434                 return false;
 435         }
 436
 437         s->parent = parent;
 438         s->fd = open_socket_in(SOCK_STREAM,
 439                                port,
 440                                parent->sockets == NULL ? 0 : 2,
 441                                ifss,
 442                                true);
 443         if (s->fd == -1) {
 444                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
 445                         "%s\n", strerror(errno)));
 446                         close(s->fd);
 447                 TALLOC_FREE(s);
 448                 /*
 449                  * We ignore an error here, as we've done before
 450                  */
 451                 return true;
 452         }
 453
 454         /* ready to listen */
 455         set_socket_options(s->fd, "SO_KEEPALIVE");
 456         set_socket_options(s->fd, lp_socket_options());
 457
 458         /* Set server socket to
 459          * non-blocking for the accept. */
 460         set_blocking(s->fd, False);
 461
 462         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
 463                 DEBUG(0,("open_sockets_smbd: listen: "
 464                         "%s\n", strerror(errno)));
 465                         close(s->fd);
 466                 TALLOC_FREE(s);
 467                 return false;
 468         }
 469
 470         s->fde = tevent_add_fd(smbd_event_context(),
 471                                s,
 472                                s->fd, TEVENT_FD_READ,
 473                                smbd_accept_connection,
 474                                s);
 475         if (!s->fde) {
 476                 DEBUG(0,("open_sockets_smbd: "
 477                          "tevent_add_fd: %s\n",
 478                          strerror(errno)));
 479                 close(s->fd);
 480                 TALLOC_FREE(s);
 481                 return false;
 482         }
 483         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
 484
 485         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
 486
 487         return true;
 488 }
 489
 490 /****************************************************************************
 491  Open the socket communication.
 492 ****************************************************************************/
 493
 494 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 495                               const char *smb_ports)
 496 {
 497         int num_interfaces = iface_count();
 498         int i;
 499         char *ports;
 500         unsigned dns_port = 0;
 501
 502 #ifdef HAVE_ATEXIT
 503         atexit(killkids);
 504 #endif
 505
 506         /* Stop zombies */
 507         smbd_setup_sig_chld_handler();
 508
 509         /* use a reasonable default set of ports - listing on 445 and 139 */
 510         if (!smb_ports) {
 511                 ports = lp_smb_ports();
 512                 if (!ports || !*ports) {
 513                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 514                 } else {
 515                         ports = talloc_strdup(talloc_tos(), ports);
 516                 }
 517         } else {
 518                 ports = talloc_strdup(talloc_tos(), smb_ports);
 519         }
 520
 521         if (lp_interfaces() && lp_bind_interfaces_only()) {
 522                 /* We have been given an interfaces line, and been
 523                    told to only bind to those interfaces. Create a
 524                    socket per interface and bind to only these.
 525                 */
 526
 527                 /* Now open a listen socket for each of the
 528                    interfaces. */
 529                 for(i = 0; i < num_interfaces; i++) {
 530                         const struct sockaddr_storage *ifss =
 531                                         iface_n_sockaddr_storage(i);
 532                         char *tok;
 533                         const char *ptr;
 534
 535                         if (ifss == NULL) {
 536                                 DEBUG(0,("open_sockets_smbd: "
 537                                         "interface %d has NULL IP address !\n",
 538                                         i));
 539                                 continue;
 540                         }
 541
 542                         for (ptr=ports;
 543                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 544                                 unsigned port = atoi(tok);
 545                                 if (port == 0 || port > 0xffff) {
 546                                         continue;
 547                                 }
 548
 549                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 550                                         return false;
 551                                 }
 552                         }
 553                 }
 554         } else {
 555                 /* Just bind to 0.0.0.0 - accept connections
 556                    from anywhere. */
 557
 558                 char *tok;
 559                 const char *ptr;
 560                 const char *sock_addr = lp_socket_address();
 561                 char *sock_tok;
 562                 const char *sock_ptr;
 563
 564                 if (strequal(sock_addr, "0.0.0.0") ||
 565                     strequal(sock_addr, "::")) {
 566 #if HAVE_IPV6
 567                         sock_addr = "::,0.0.0.0";
 568 #else
 569                         sock_addr = "0.0.0.0";
 570 #endif
 571                 }
 572
 573                 for (sock_ptr=sock_addr;
 574                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 575                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 576                                 struct sockaddr_storage ss;
 577
 578                                 unsigned port = atoi(tok);
 579                                 if (port == 0 || port > 0xffff) {
 580                                         continue;
 581                                 }
 582
 583                                 /* Keep the first port for mDNS service
 584                                  * registration.
 585                                  */
 586                                 if (dns_port == 0) {
 587                                         dns_port = port;
 588                                 }
 589
 590                                 /* open an incoming socket */
 591                                 if (!interpret_string_addr(&ss, sock_tok,
 592                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 593                                         continue;
 594                                 }
 595
 596                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 597                                         return false;
 598                                 }
 599                         }
 600                 }
 601         }
 602
 603         if (parent->sockets == NULL) {
 604                 DEBUG(0,("open_sockets_smbd: No "
 605                         "sockets available to bind to.\n"));
 606                 return false;
 607         }
 608
 609         /* Setup the main smbd so that we can get messages. Note that
 610            do this after starting listening. This is needed as when in
 611            clustered mode, ctdb won't allow us to start doing database
 612            operations until it has gone thru a full startup, which
 613            includes checking to see that smbd is listening. */
 614         claim_connection(NULL,"",
 615                          FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
 616
 617         /* Listen to messages */
 618
 619         messaging_register(smbd_messaging_context(), NULL,
 620                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 621         messaging_register(smbd_messaging_context(), NULL,
 622                            MSG_SHUTDOWN, msg_exit_server);
 623         messaging_register(smbd_messaging_context(), NULL,
 624                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 625         messaging_register(smbd_messaging_context(), NULL,
 626                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 627         messaging_register(smbd_messaging_context(), NULL,
 628                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 629         brl_register_msgs(smbd_messaging_context());
 630
 631 #ifdef CLUSTER_SUPPORT
 632         if (lp_clustering()) {
 633                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 634         }
 635 #endif
 636
 637 #ifdef DEVELOPER
 638         messaging_register(smbd_messaging_context(), NULL,
 639                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 640 #endif
 641
 642         if (dns_port != 0) {
 643                 smbd_setup_mdns_registration(smbd_event_context(),
 644                                              parent, dns_port);
 645         }
 646
 647         return true;
 648 }
 649
 650 static void smbd_parent_loop(struct smbd_parent_context *parent)
 651 {
 652         /* now accept incoming connections - forking a new process
 653            for each incoming connection */
 654         DEBUG(2,("waiting for a connection\n"));
 655         while (1) {
 656                 struct timeval now, idle_timeout;
 657                 fd_set r_fds, w_fds;
 658                 int maxfd = 0;
 659                 int num;
 660                 TALLOC_CTX *frame = talloc_stackframe();
 661
 662                 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
 663                         TALLOC_FREE(frame);
 664                         continue;
 665                 }
 666
 667                 idle_timeout = timeval_zero();
 668
 669                 FD_ZERO(&w_fds);
 670                 FD_ZERO(&r_fds);
 671                 GetTimeOfDay(&now);
 672
 673                 event_add_to_select_args(smbd_event_context(), &now,
 674                                          &r_fds, &w_fds, &idle_timeout,
 675                                          &maxfd);
 676
 677                 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
 678                                  timeval_is_zero(&idle_timeout) ?
 679                                  NULL : &idle_timeout);
 680
 681                 /* check if we need to reload services */
 682                 check_reload(time(NULL));
 683
 684                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 685                         TALLOC_FREE(frame);
 686                         continue;
 687                 }
 688
 689                 /* If the idle timeout fired and we don't have any connected
 690                  * users, exit gracefully. We should be running under a process
 691                  * controller that will restart us if necessry.
 692                  */
 693                 if (num == 0 && count_all_current_connections() == 0) {
 694                         exit_server_cleanly("idle timeout");
 695                 }
 696                 TALLOC_FREE(frame);
 697         } /* end while 1 */
 698
 699 /* NOTREACHED   return True; */
 700 }
 701
 702 /****************************************************************************
 703  Reload printers
 704 **************************************************************************/
 705 void reload_printers(void)
 706 {
 707         int snum;
 708         int n_services = lp_numservices();
 709         int pnum = lp_servicenumber(PRINTERS_NAME);
 710         const char *pname;
 711
 712         pcap_cache_reload();
 713
 714         /* remove stale printers */
 715         for (snum = 0; snum < n_services; snum++) {
 716                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 717                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 718                                       lp_autoloaded(snum)))
 719                         continue;
 720
 721                 pname = lp_printername(snum);
 722                 if (!pcap_printername_ok(pname)) {
 723                         DEBUG(3, ("removing stale printer %s\n", pname));
 724
 725                         if (is_printer_published(NULL, snum, NULL))
 726                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 727                         del_a_printer(pname);
 728                         lp_killservice(snum);
 729                 }
 730         }
 731
 732         load_printers();
 733 }
 734
 735 /****************************************************************************
 736  Reload the services file.
 737 **************************************************************************/
 738
 739 bool reload_services(bool test)
 740 {
 741         bool ret;
 742
 743         if (lp_loaded()) {
 744                 char *fname = lp_configfile();
 745                 if (file_exist(fname) &&
 746                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 747                         set_dyn_CONFIGFILE(fname);
 748                         test = False;
 749                 }
 750         }
 751
 752         reopen_logs();
 753
 754         if (test && !lp_file_list_changed())
 755                 return(True);
 756
 757         lp_killunused(conn_snum_used);
 758
 759         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 760
 761         reload_printers();
 762
 763         /* perhaps the config filename is now set */
 764         if (!test)
 765                 reload_services(True);
 766
 767         reopen_logs();
 768
 769         load_interfaces();
 770
 771         if (smbd_server_fd() != -1) {
 772                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 773                 set_socket_options(smbd_server_fd(), lp_socket_options());
 774         }
 775
 776         mangle_reset_cache();
 777         reset_stat_cache();
 778
 779         /* this forces service parameters to be flushed */
 780         set_current_service(NULL,0,True);
 781
 782         return(ret);
 783 }
 784
 785 /****************************************************************************
 786  Exit the server.
 787 ****************************************************************************/
 788
 789 /* Reasons for shutting down a server process. */
 790 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 791
 792 static void exit_server_common(enum server_exit_reason how,
 793         const char *const reason) _NORETURN_;
 794
 795 static void exit_server_common(enum server_exit_reason how,
 796         const char *const reason)
 797 {
 798         bool had_open_conn;
 799
 800         if (!exit_firsttime)
 801                 exit(0);
 802         exit_firsttime = false;
 803
 804         change_to_root_user();
 805
 806         if (negprot_global_auth_context) {
 807                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 808         }
 809
 810         had_open_conn = conn_close_all();
 811
 812         invalidate_all_vuids();
 813
 814         /* 3 second timeout. */
 815         print_notify_send_messages(smbd_messaging_context(), 3);
 816
 817         /* delete our entry in the connections database. */
 818         yield_connection(NULL,"");
 819
 820 #ifdef WITH_DFS
 821         if (dcelogin_atmost_once) {
 822                 dfs_unlogin();
 823         }
 824 #endif
 825
 826 #ifdef USE_DMAPI
 827         /* Destroy Samba DMAPI session only if we are master smbd process */
 828         if (am_parent) {
 829                 if (!dmapi_destroy_session()) {
 830                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 831                 }
 832         }
 833 #endif
 834
 835         locking_end();
 836         printing_end();
 837
 838         if (how != SERVER_EXIT_NORMAL) {
 839                 int oldlevel = DEBUGLEVEL;
 840
 841                 DEBUGLEVEL = 10;
 842
 843                 DEBUGSEP(0);
 844                 DEBUG(0,("Abnormal server exit: %s\n",
 845                         reason ? reason : "no explanation provided"));
 846                 DEBUGSEP(0);
 847
 848                 log_stack_trace();
 849
 850                 DEBUGLEVEL = oldlevel;
 851                 dump_core();
 852
 853         } else {
 854                 DEBUG(3,("Server exit (%s)\n",
 855                         (reason ? reason : "normal exit")));
 856         }
 857
 858         /* if we had any open SMB connections when we exited then we
 859            need to tell the parent smbd so that it can trigger a retry
 860            of any locks we may have been holding or open files we were
 861            blocking */
 862         if (had_open_conn) {
 863                 exit(1);
 864         } else {
 865                 exit(0);
 866         }
 867 }
 868
 869 void exit_server(const char *const explanation)
 870 {
 871         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 872 }
 873
 874 void exit_server_cleanly(const char *const explanation)
 875 {
 876         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 877 }
 878
 879 void exit_server_fault(void)
 880 {
 881         exit_server("critical server fault");
 882 }
 883
 884 /****************************************************************************
 885  Initialise connect, service and file structs.
 886 ****************************************************************************/
 887
 888 static bool init_structs(void )
 889 {
 890         /*
 891          * Set the machine NETBIOS name if not already
 892          * set from the config file.
 893          */
 894
 895         if (!init_names())
 896                 return False;
 897
 898         conn_init();
 899
 900         file_init();
 901
 902         init_dptrs();
 903
 904         if (!secrets_init())
 905                 return False;
 906
 907         return True;
 908 }
 909
 910 /****************************************************************************
 911  main program.
 912 ****************************************************************************/
 913
 914 /* Declare prototype for build_options() to avoid having to run it through
 915    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 916    prototype generation system is too complicated. */
 917
 918 extern void build_options(bool screen);
 919
 920  int main(int argc,const char *argv[])
 921 {
 922         /* shall I run as a daemon */
 923         bool is_daemon = false;
 924         bool interactive = false;
 925         bool Fork = true;
 926         bool no_process_group = false;
 927         bool log_stdout = false;
 928         char *ports = NULL;
 929         char *profile_level = NULL;
 930         int opt;
 931         poptContext pc;
 932         bool print_build_options = False;
 933         enum {
 934                 OPT_DAEMON = 1000,
 935                 OPT_INTERACTIVE,
 936                 OPT_FORK,
 937                 OPT_NO_PROCESS_GROUP,
 938                 OPT_LOG_STDOUT
 939         };
 940         struct poptOption long_options[] = {
 941         POPT_AUTOHELP
 942         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 943         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 944         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 945         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 946         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 947         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 948         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 949         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 950         POPT_COMMON_SAMBA
 951         POPT_COMMON_DYNCONFIG
 952         POPT_TABLEEND
 953         };
 954         struct smbd_parent_context *parent = NULL;
 955         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 956
 957         smbd_init_globals();
 958
 959         TimeInit();
 960
 961 #ifdef HAVE_SET_AUTH_PARAMETERS
 962         set_auth_parameters(argc,argv);
 963 #endif
 964
 965         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 966         while((opt = poptGetNextOpt(pc)) != -1) {
 967                 switch (opt)  {
 968                 case OPT_DAEMON:
 969                         is_daemon = true;
 970                         break;
 971                 case OPT_INTERACTIVE:
 972                         interactive = true;
 973                         break;
 974                 case OPT_FORK:
 975                         Fork = false;
 976                         break;
 977                 case OPT_NO_PROCESS_GROUP:
 978                         no_process_group = true;
 979                         break;
 980                 case OPT_LOG_STDOUT:
 981                         log_stdout = true;
 982                         break;
 983                 case 'b':
 984                         print_build_options = True;
 985                         break;
 986                 default:
 987                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 988                                   poptBadOption(pc, 0), poptStrerror(opt));
 989                         poptPrintUsage(pc, stderr, 0);
 990                         exit(1);
 991                 }
 992         }
 993         poptFreeContext(pc);
 994
 995         if (interactive) {
 996                 Fork = False;
 997                 log_stdout = True;
 998         }
 999
1000         setup_logging(argv[0],log_stdout);
1001
1002         if (print_build_options) {
1003                 build_options(True); /* Display output to screen as well as debug */
1004                 exit(0);
1005         }
1006
1007         load_case_tables();
1008
1009 #ifdef HAVE_SETLUID
1010         /* needed for SecureWare on SCO */
1011         setluid(0);
1012 #endif
1013
1014         sec_init();
1015
1016         set_remote_machine_name("smbd", False);
1017
1018         if (interactive && (DEBUGLEVEL >= 9)) {
1019                 talloc_enable_leak_report();
1020         }
1021
1022         if (log_stdout && Fork) {
1023                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1024                 exit(1);
1025         }
1026
1027         /* we want to re-seed early to prevent time delays causing
1028            client problems at a later date. (tridge) */
1029         generate_random_buffer(NULL, 0);
1030
1031         /* make absolutely sure we run as root - to handle cases where people
1032            are crazy enough to have it setuid */
1033
1034         gain_root_privilege();
1035         gain_root_group_privilege();
1036
1037         fault_setup((void (*)(void *))exit_server_fault);
1038         dump_core_setup("smbd");
1039
1040         /* we are never interested in SIGPIPE */
1041         BlockSignals(True,SIGPIPE);
1042
1043 #if defined(SIGFPE)
1044         /* we are never interested in SIGFPE */
1045         BlockSignals(True,SIGFPE);
1046 #endif
1047
1048 #if defined(SIGUSR2)
1049         /* We are no longer interested in USR2 */
1050         BlockSignals(True,SIGUSR2);
1051 #endif
1052
1053         /* POSIX demands that signals are inherited. If the invoking process has
1054          * these signals masked, we will have problems, as we won't recieve them. */
1055         BlockSignals(False, SIGHUP);
1056         BlockSignals(False, SIGUSR1);
1057         BlockSignals(False, SIGTERM);
1058
1059         /* we want total control over the permissions on created files,
1060            so set our umask to 0 */
1061         umask(0);
1062
1063         init_sec_ctx();
1064
1065         reopen_logs();
1066
1067         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1068         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1069
1070         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1071                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1072
1073         /* Output the build options to the debug log */
1074         build_options(False);
1075
1076         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1077                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1078                 exit(1);
1079         }
1080
1081         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1082                 DEBUG(0, ("error opening config file\n"));
1083                 exit(1);
1084         }
1085
1086         if (smbd_messaging_context() == NULL)
1087                 exit(1);
1088
1089         if (!reload_services(False))
1090                 return(-1);
1091
1092         init_structs();
1093
1094 #ifdef WITH_PROFILE
1095         if (!profile_setup(smbd_messaging_context(), False)) {
1096                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1097                 return -1;
1098         }
1099         if (profile_level != NULL) {
1100                 int pl = atoi(profile_level);
1101                 struct server_id src;
1102
1103                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1104                 src.pid = getpid();
1105                 set_profile_level(pl, src);
1106         }
1107 #endif
1108
1109         DEBUG(3,( "loaded services\n"));
1110
1111         if (!is_daemon && !is_a_socket(0)) {
1112                 if (!interactive)
1113                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1114
1115                 /*
1116                  * Setting is_daemon here prevents us from eventually calling
1117                  * the open_sockets_inetd()
1118                  */
1119
1120                 is_daemon = True;
1121         }
1122
1123         if (is_daemon && !interactive) {
1124                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1125                 become_daemon(Fork, no_process_group);
1126         }
1127
1128 #if HAVE_SETPGID
1129         /*
1130          * If we're interactive we want to set our own process group for
1131          * signal management.
1132          */
1133         if (interactive && !no_process_group)
1134                 setpgid( (pid_t)0, (pid_t)0);
1135 #endif
1136
1137         if (!directory_exist(lp_lockdir()))
1138                 mkdir(lp_lockdir(), 0755);
1139
1140         if (is_daemon)
1141                 pidfile_create("smbd");
1142
1143         if (!reinit_after_fork(smbd_messaging_context(),
1144                                smbd_event_context(), false)) {
1145                 DEBUG(0,("reinit_after_fork() failed\n"));
1146                 exit(1);
1147         }
1148
1149         smbd_setup_sig_term_handler();
1150         smbd_setup_sig_hup_handler();
1151
1152         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1153
1154         if (smbd_memcache() == NULL) {
1155                 exit(1);
1156         }
1157
1158         memcache_set_global(smbd_memcache());
1159
1160         /* Initialise the password backed before the global_sam_sid
1161            to ensure that we fetch from ldap before we make a domain sid up */
1162
1163         if(!initialize_password_db(False, smbd_event_context()))
1164                 exit(1);
1165
1166         if (!secrets_init()) {
1167                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1168                 exit(1);
1169         }
1170
1171         if(!get_global_sam_sid()) {
1172                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1173                 exit(1);
1174         }
1175
1176         if (!session_init())
1177                 exit(1);
1178
1179         if (!connections_init(True))
1180                 exit(1);
1181
1182         if (!locking_init())
1183                 exit(1);
1184
1185         namecache_enable();
1186
1187         if (!W_ERROR_IS_OK(registry_init_full()))
1188                 exit(1);
1189
1190 #if 0
1191         if (!init_svcctl_db())
1192                 exit(1);
1193 #endif
1194
1195         if (!print_backend_init(smbd_messaging_context()))
1196                 exit(1);
1197
1198         if (!init_guest_info()) {
1199                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1200                 return -1;
1201         }
1202
1203         /* only start the background queue daemon if we are
1204            running as a daemon -- bad things will happen if
1205            smbd is launched via inetd and we fork a copy of
1206            ourselves here */
1207
1208         if (is_daemon && !interactive
1209             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1210                 start_background_queue();
1211         }
1212
1213         if (!is_daemon) {
1214                 /* inetd mode */
1215                 TALLOC_FREE(frame);
1216
1217                 /* Started from inetd. fd 0 is the socket. */
1218                 /* We will abort gracefully when the client or remote system
1219                    goes away */
1220                 smbd_set_server_fd(dup(0));
1221
1222                 /* close our standard file descriptors */
1223                 close_low_fds(False); /* Don't close stderr */
1224
1225                 smbd_process();
1226
1227                 exit_server_cleanly(NULL);
1228                 return(0);
1229         }
1230
1231         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1232         if (!parent) {
1233                 exit_server("talloc(struct smbd_parent_context) failed");
1234         }
1235         parent->interactive = interactive;
1236
1237         if (!open_sockets_smbd(parent, ports))
1238                 exit_server("open_sockets_smbd() failed");
1239
1240         TALLOC_FREE(frame);
1241
1242         smbd_parent_loop(parent);
1243
1244         exit_server_cleanly(NULL);
1245         return(0);
1246 }