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                                               procid_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         change_to_root_user();
  98         reload_services(False);
  99 }
 100
 101
 102 /*******************************************************************
 103  Delete a statcache entry.
 104  ********************************************************************/
 105
 106 static void smb_stat_cache_delete(struct messaging_context *msg,
 107                                   void *private_data,
 108                                   uint32_t msg_tnype,
 109                                   struct server_id server_id,
 110                                   DATA_BLOB *data)
 111 {
 112         const char *name = (const char *)data->data;
 113         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 114         stat_cache_delete(name);
 115 }
 116
 117 /****************************************************************************
 118   Send a SIGTERM to our process group.
 119 *****************************************************************************/
 120
 121 static void  killkids(void)
 122 {
 123         if(am_parent) kill(0,SIGTERM);
 124 }
 125
 126 /****************************************************************************
 127  Process a sam sync message - not sure whether to do this here or
 128  somewhere else.
 129 ****************************************************************************/
 130
 131 static void msg_sam_sync(struct messaging_context *msg,
 132                          void *private_data,
 133                          uint32_t msg_type,
 134                          struct server_id server_id,
 135                          DATA_BLOB *data)
 136 {
 137         DEBUG(10, ("** sam sync message received, ignoring\n"));
 138 }
 139
 140 static void msg_exit_server(struct messaging_context *msg,
 141                             void *private_data,
 142                             uint32_t msg_type,
 143                             struct server_id server_id,
 144                             DATA_BLOB *data)
 145 {
 146         DEBUG(3, ("got a SHUTDOWN message\n"));
 147         exit_server_cleanly(NULL);
 148 }
 149
 150 #ifdef DEVELOPER
 151 static void msg_inject_fault(struct messaging_context *msg,
 152                              void *private_data,
 153                              uint32_t msg_type,
 154                              struct server_id src,
 155                              DATA_BLOB *data)
 156 {
 157         int sig;
 158
 159         if (data->length != sizeof(sig)) {
 160
 161                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 162                           procid_str_static(&src)));
 163                 return;
 164         }
 165
 166         sig = *(int *)data->data;
 167         if (sig == -1) {
 168                 exit_server("internal error injected");
 169                 return;
 170         }
 171
 172 #if HAVE_STRSIGNAL
 173         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 174                   procid_str_static(&src), sig, strsignal(sig)));
 175 #else
 176         DEBUG(0, ("Process %s requested injection of signal %d\n",
 177                   procid_str_static(&src), sig));
 178 #endif
 179
 180         kill(sys_getpid(), sig);
 181 }
 182 #endif /* DEVELOPER */
 183
 184 /*
 185  * Parent smbd process sets its own debug level first and then
 186  * sends a message to all the smbd children to adjust their debug
 187  * level to that of the parent.
 188  */
 189
 190 static void smbd_msg_debug(struct messaging_context *msg_ctx,
 191                            void *private_data,
 192                            uint32_t msg_type,
 193                            struct server_id server_id,
 194                            DATA_BLOB *data)
 195 {
 196         struct child_pid *child;
 197
 198         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 199
 200         for (child = children; child != NULL; child = child->next) {
 201                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 202                                    MSG_DEBUG,
 203                                    data->data,
 204                                    strlen((char *) data->data) + 1);
 205         }
 206 }
 207
 208 static void add_child_pid(pid_t pid)
 209 {
 210         struct child_pid *child;
 211
 212         child = SMB_MALLOC_P(struct child_pid);
 213         if (child == NULL) {
 214                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 215                 return;
 216         }
 217         child->pid = pid;
 218         DLIST_ADD(children, child);
 219         num_children += 1;
 220 }
 221
 222 /*
 223   at most every smbd:cleanuptime seconds (default 20), we scan the BRL
 224   and locking database for entries to cleanup. As a side effect this
 225   also cleans up dead entries in the connections database (due to the
 226   traversal in message_send_all()
 227
 228   Using a timer for this prevents a flood of traversals when a large
 229   number of clients disconnect at the same time (perhaps due to a
 230   network outage).
 231 */
 232
 233 static void cleanup_timeout_fn(struct event_context *event_ctx,
 234                                 struct timed_event *te,
 235                                 struct timeval now,
 236                                 void *private_data)
 237 {
 238         struct timed_event **cleanup_te = (struct timed_event **)private_data;
 239
 240         DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
 241         message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
 242         messaging_send_buf(smbd_messaging_context(), procid_self(),
 243                                 MSG_SMB_BRL_VALIDATE, NULL, 0);
 244         /* mark the cleanup as having been done */
 245         (*cleanup_te) = NULL;
 246 }
 247
 248 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 249 {
 250         struct child_pid *child;
 251         static struct timed_event *cleanup_te;
 252
 253         if (unclean_shutdown) {
 254                 /* a child terminated uncleanly so tickle all
 255                    processes to see if they can grab any of the
 256                    pending locks
 257                 */
 258                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
 259                         (unsigned int)pid));
 260                 if (!cleanup_te) {
 261                         /* call the cleanup timer, but not too often */
 262                         int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
 263                         cleanup_te = event_add_timed(smbd_event_context(), NULL,
 264                                                 timeval_current_ofs(cleanup_time, 0),
 265                                                 cleanup_timeout_fn,
 266                                                 &cleanup_te);
 267                         DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
 268                 }
 269         }
 270
 271         for (child = children; child != NULL; child = child->next) {
 272                 if (child->pid == pid) {
 273                         struct child_pid *tmp = child;
 274                         DLIST_REMOVE(children, child);
 275                         SAFE_FREE(tmp);
 276                         num_children -= 1;
 277                         return;
 278                 }
 279         }
 280
 281         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 282 }
 283
 284 /****************************************************************************
 285  Have we reached the process limit ?
 286 ****************************************************************************/
 287
 288 static bool allowable_number_of_smbd_processes(void)
 289 {
 290         int max_processes = lp_max_smbd_processes();
 291
 292         if (!max_processes)
 293                 return True;
 294
 295         return num_children < max_processes;
 296 }
 297
 298 static void smbd_sig_chld_handler(struct tevent_context *ev,
 299                                   struct tevent_signal *se,
 300                                   int signum,
 301                                   int count,
 302                                   void *siginfo,
 303                                   void *private_data)
 304 {
 305         pid_t pid;
 306         int status;
 307
 308         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 309                 bool unclean_shutdown = False;
 310
 311                 /* If the child terminated normally, assume
 312                    it was an unclean shutdown unless the
 313                    status is 0
 314                 */
 315                 if (WIFEXITED(status)) {
 316                         unclean_shutdown = WEXITSTATUS(status);
 317                 }
 318                 /* If the child terminated due to a signal
 319                    we always assume it was unclean.
 320                 */
 321                 if (WIFSIGNALED(status)) {
 322                         unclean_shutdown = True;
 323                 }
 324                 remove_child_pid(pid, unclean_shutdown);
 325         }
 326 }
 327
 328 static void smbd_setup_sig_chld_handler(void)
 329 {
 330         struct tevent_signal *se;
 331
 332         se = tevent_add_signal(smbd_event_context(),
 333                                smbd_event_context(),
 334                                SIGCHLD, 0,
 335                                smbd_sig_chld_handler,
 336                                NULL);
 337         if (!se) {
 338                 exit_server("failed to setup SIGCHLD handler");
 339         }
 340 }
 341
 342 struct smbd_open_socket;
 343
 344 struct smbd_parent_context {
 345         bool interactive;
 346
 347         /* the list of listening sockets */
 348         struct smbd_open_socket *sockets;
 349 };
 350
 351 struct smbd_open_socket {
 352         struct smbd_open_socket *prev, *next;
 353         struct smbd_parent_context *parent;
 354         int fd;
 355         struct tevent_fd *fde;
 356 };
 357
 358 static void smbd_open_socket_close_fn(struct tevent_context *ev,
 359                                       struct tevent_fd *fde,
 360                                       int fd,
 361                                       void *private_data)
 362 {
 363         /* this might be the socket_wrapper swrap_close() */
 364         close(fd);
 365 }
 366
 367 static void smbd_accept_connection(struct tevent_context *ev,
 368                                    struct tevent_fd *fde,
 369                                    uint16_t flags,
 370                                    void *private_data)
 371 {
 372         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
 373                                      struct smbd_open_socket);
 374         struct sockaddr_storage addr;
 375         socklen_t in_addrlen = sizeof(addr);
 376         pid_t pid = 0;
 377
 378         smbd_set_server_fd(accept(s->fd,(struct sockaddr *)&addr,&in_addrlen));
 379
 380         if (smbd_server_fd() == -1 && errno == EINTR)
 381                 return;
 382
 383         if (smbd_server_fd() == -1) {
 384                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 385                          strerror(errno)));
 386                 return;
 387         }
 388
 389         if (s->parent->interactive) {
 390                 smbd_process();
 391                 exit_server_cleanly("end of interactive mode");
 392                 return;
 393         }
 394
 395         if (!allowable_number_of_smbd_processes()) {
 396                 close(smbd_server_fd());
 397                 smbd_set_server_fd(-1);
 398                 return;
 399         }
 400
 401         pid = sys_fork();
 402         if (pid == 0) {
 403                 NTSTATUS status = NT_STATUS_OK;
 404                 /* Child code ... */
 405                 am_parent = 0;
 406
 407                 /* Stop zombies, the parent explicitly handles
 408                  * them, counting worker smbds. */
 409                 CatchChild();
 410
 411                 /* close our standard file
 412                    descriptors */
 413                 close_low_fds(False);
 414
 415                 /*
 416                  * Can't use TALLOC_FREE here. Nulling out the argument to it
 417                  * would overwrite memory we've just freed.
 418                  */
 419                 talloc_free(s->parent);
 420                 s = NULL;
 421
 422                 status = reinit_after_fork(smbd_messaging_context(),
 423                                            smbd_event_context(), true);
 424                 if (!NT_STATUS_IS_OK(status)) {
 425                         if (NT_STATUS_EQUAL(status,
 426                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
 427                                 DEBUG(0,("child process cannot initialize "
 428                                          "because too many files are open\n"));
 429                                 goto exit;
 430                         }
 431                         DEBUG(0,("reinit_after_fork() failed\n"));
 432                         smb_panic("reinit_after_fork() failed");
 433                 }
 434
 435                 smbd_setup_sig_term_handler();
 436                 smbd_setup_sig_hup_handler();
 437
 438                 smbd_process();
 439          exit:
 440                 exit_server_cleanly("end of child");
 441                 return;
 442         } else if (pid < 0) {
 443                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
 444                          strerror(errno)));
 445         }
 446
 447         /* The parent doesn't need this socket */
 448         close(smbd_server_fd());
 449
 450         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 451                 Clear the closed fd info out of server_fd --
 452                 and more importantly, out of client_fd in
 453                 util_sock.c, to avoid a possible
 454                 getpeername failure if we reopen the logs
 455                 and use %I in the filename.
 456         */
 457
 458         smbd_set_server_fd(-1);
 459
 460         if (pid != 0) {
 461                 add_child_pid(pid);
 462         }
 463
 464         /* Force parent to check log size after
 465          * spawning child.  Fix from
 466          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 467          * parent smbd will log to logserver.smb.  It
 468          * writes only two messages for each child
 469          * started/finished. But each child writes,
 470          * say, 50 messages also in logserver.smb,
 471          * begining with the debug_count of the
 472          * parent, before the child opens its own log
 473          * file logserver.client. In a worst case
 474          * scenario the size of logserver.smb would be
 475          * checked after about 50*50=2500 messages
 476          * (ca. 100kb).
 477          * */
 478         force_check_log_size();
 479 }
 480
 481 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
 482                                  const struct sockaddr_storage *ifss,
 483                                  uint16_t port)
 484 {
 485         struct smbd_open_socket *s;
 486
 487         s = talloc(parent, struct smbd_open_socket);
 488         if (!s) {
 489                 return false;
 490         }
 491
 492         s->parent = parent;
 493         s->fd = open_socket_in(SOCK_STREAM,
 494                                port,
 495                                parent->sockets == NULL ? 0 : 2,
 496                                ifss,
 497                                true);
 498         if (s->fd == -1) {
 499                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
 500                         "%s\n", strerror(errno)));
 501                 TALLOC_FREE(s);
 502                 /*
 503                  * We ignore an error here, as we've done before
 504                  */
 505                 return true;
 506         }
 507
 508         /* ready to listen */
 509         set_socket_options(s->fd, "SO_KEEPALIVE");
 510         set_socket_options(s->fd, lp_socket_options());
 511
 512         /* Set server socket to
 513          * non-blocking for the accept. */
 514         set_blocking(s->fd, False);
 515
 516         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
 517                 DEBUG(0,("open_sockets_smbd: listen: "
 518                         "%s\n", strerror(errno)));
 519                         close(s->fd);
 520                 TALLOC_FREE(s);
 521                 return false;
 522         }
 523
 524         s->fde = tevent_add_fd(smbd_event_context(),
 525                                s,
 526                                s->fd, TEVENT_FD_READ,
 527                                smbd_accept_connection,
 528                                s);
 529         if (!s->fde) {
 530                 DEBUG(0,("open_sockets_smbd: "
 531                          "tevent_add_fd: %s\n",
 532                          strerror(errno)));
 533                 close(s->fd);
 534                 TALLOC_FREE(s);
 535                 return false;
 536         }
 537         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
 538
 539         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
 540
 541         return true;
 542 }
 543
 544 /****************************************************************************
 545  Open the socket communication.
 546 ****************************************************************************/
 547
 548 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 549                               const char *smb_ports)
 550 {
 551         int num_interfaces = iface_count();
 552         int i;
 553         char *ports;
 554         unsigned dns_port = 0;
 555
 556 #ifdef HAVE_ATEXIT
 557         atexit(killkids);
 558 #endif
 559
 560         /* Stop zombies */
 561         smbd_setup_sig_chld_handler();
 562
 563         /* use a reasonable default set of ports - listing on 445 and 139 */
 564         if (!smb_ports) {
 565                 ports = lp_smb_ports();
 566                 if (!ports || !*ports) {
 567                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 568                 } else {
 569                         ports = talloc_strdup(talloc_tos(), ports);
 570                 }
 571         } else {
 572                 ports = talloc_strdup(talloc_tos(), smb_ports);
 573         }
 574
 575         if (lp_interfaces() && lp_bind_interfaces_only()) {
 576                 /* We have been given an interfaces line, and been
 577                    told to only bind to those interfaces. Create a
 578                    socket per interface and bind to only these.
 579                 */
 580
 581                 /* Now open a listen socket for each of the
 582                    interfaces. */
 583                 for(i = 0; i < num_interfaces; i++) {
 584                         const struct sockaddr_storage *ifss =
 585                                         iface_n_sockaddr_storage(i);
 586                         char *tok;
 587                         const char *ptr;
 588
 589                         if (ifss == NULL) {
 590                                 DEBUG(0,("open_sockets_smbd: "
 591                                         "interface %d has NULL IP address !\n",
 592                                         i));
 593                                 continue;
 594                         }
 595
 596                         for (ptr=ports;
 597                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 598                                 unsigned port = atoi(tok);
 599                                 if (port == 0 || port > 0xffff) {
 600                                         continue;
 601                                 }
 602
 603                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 604                                         return false;
 605                                 }
 606                         }
 607                 }
 608         } else {
 609                 /* Just bind to 0.0.0.0 - accept connections
 610                    from anywhere. */
 611
 612                 char *tok;
 613                 const char *ptr;
 614                 const char *sock_addr = lp_socket_address();
 615                 char *sock_tok;
 616                 const char *sock_ptr;
 617
 618                 if (strequal(sock_addr, "0.0.0.0") ||
 619                     strequal(sock_addr, "::")) {
 620 #if HAVE_IPV6
 621                         sock_addr = "::,0.0.0.0";
 622 #else
 623                         sock_addr = "0.0.0.0";
 624 #endif
 625                 }
 626
 627                 for (sock_ptr=sock_addr;
 628                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 629                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 630                                 struct sockaddr_storage ss;
 631
 632                                 unsigned port = atoi(tok);
 633                                 if (port == 0 || port > 0xffff) {
 634                                         continue;
 635                                 }
 636
 637                                 /* Keep the first port for mDNS service
 638                                  * registration.
 639                                  */
 640                                 if (dns_port == 0) {
 641                                         dns_port = port;
 642                                 }
 643
 644                                 /* open an incoming socket */
 645                                 if (!interpret_string_addr(&ss, sock_tok,
 646                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 647                                         continue;
 648                                 }
 649
 650                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 651                                         return false;
 652                                 }
 653                         }
 654                 }
 655         }
 656
 657         if (parent->sockets == NULL) {
 658                 DEBUG(0,("open_sockets_smbd: No "
 659                         "sockets available to bind to.\n"));
 660                 return false;
 661         }
 662
 663         /* Setup the main smbd so that we can get messages. Note that
 664            do this after starting listening. This is needed as when in
 665            clustered mode, ctdb won't allow us to start doing database
 666            operations until it has gone thru a full startup, which
 667            includes checking to see that smbd is listening. */
 668         claim_connection(NULL,"",
 669                          FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
 670
 671         /* Listen to messages */
 672
 673         messaging_register(smbd_messaging_context(), NULL,
 674                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 675         messaging_register(smbd_messaging_context(), NULL,
 676                            MSG_SHUTDOWN, msg_exit_server);
 677         messaging_register(smbd_messaging_context(), NULL,
 678                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 679         messaging_register(smbd_messaging_context(), NULL,
 680                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 681         messaging_register(smbd_messaging_context(), NULL,
 682                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 683         messaging_register(smbd_messaging_context(), NULL,
 684                            MSG_DEBUG, smbd_msg_debug);
 685         brl_register_msgs(smbd_messaging_context());
 686
 687 #ifdef CLUSTER_SUPPORT
 688         if (lp_clustering()) {
 689                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 690         }
 691 #endif
 692
 693 #ifdef DEVELOPER
 694         messaging_register(smbd_messaging_context(), NULL,
 695                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 696 #endif
 697
 698         if (dns_port != 0) {
 699 #ifdef WITH_DNSSD_SUPPORT
 700                 smbd_setup_mdns_registration(smbd_event_context(),
 701                                              parent, dns_port);
 702 #endif
 703 #ifdef WITH_AVAHI_SUPPORT
 704                 void *avahi_conn;
 705
 706                 avahi_conn = avahi_start_register(
 707                         smbd_event_context(), smbd_event_context(), dns_port);
 708                 if (avahi_conn == NULL) {
 709                         DEBUG(10, ("avahi_start_register failed\n"));
 710                 }
 711 #endif
 712         }
 713
 714         return true;
 715 }
 716
 717 static void smbd_parent_loop(struct smbd_parent_context *parent)
 718 {
 719         /* now accept incoming connections - forking a new process
 720            for each incoming connection */
 721         DEBUG(2,("waiting for connections\n"));
 722         while (1) {
 723                 int ret;
 724                 TALLOC_CTX *frame = talloc_stackframe();
 725
 726                 ret = tevent_loop_once(smbd_event_context());
 727                 if (ret != 0) {
 728                         exit_server_cleanly("tevent_loop_once() error");
 729                 }
 730
 731                 TALLOC_FREE(frame);
 732         } /* end while 1 */
 733
 734 /* NOTREACHED   return True; */
 735 }
 736
 737 /****************************************************************************
 738  Reload printers
 739 **************************************************************************/
 740 void reload_printers(void)
 741 {
 742         int snum;
 743         int n_services = lp_numservices();
 744         int pnum = lp_servicenumber(PRINTERS_NAME);
 745         const char *pname;
 746
 747         pcap_cache_reload();
 748
 749         /* remove stale printers */
 750         for (snum = 0; snum < n_services; snum++) {
 751                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 752                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 753                                       lp_autoloaded(snum)))
 754                         continue;
 755
 756                 pname = lp_printername(snum);
 757                 if (!pcap_printername_ok(pname)) {
 758                         DEBUG(3, ("removing stale printer %s\n", pname));
 759
 760                         if (is_printer_published(NULL, snum, NULL))
 761                                 nt_printer_publish(NULL, snum, DSPRINT_UNPUBLISH);
 762                         del_a_printer(pname);
 763                         lp_killservice(snum);
 764                 }
 765         }
 766
 767         load_printers();
 768 }
 769
 770 /****************************************************************************
 771  Reload the services file.
 772 **************************************************************************/
 773
 774 bool reload_services(bool test)
 775 {
 776         bool ret;
 777
 778         if (lp_loaded()) {
 779                 char *fname = lp_configfile();
 780                 if (file_exist(fname) &&
 781                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 782                         set_dyn_CONFIGFILE(fname);
 783                         test = False;
 784                 }
 785         }
 786
 787         reopen_logs();
 788
 789         if (test && !lp_file_list_changed())
 790                 return(True);
 791
 792         lp_killunused(conn_snum_used);
 793
 794         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 795
 796         reload_printers();
 797
 798         /* perhaps the config filename is now set */
 799         if (!test)
 800                 reload_services(True);
 801
 802         reopen_logs();
 803
 804         load_interfaces();
 805
 806         if (smbd_server_fd() != -1) {
 807                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 808                 set_socket_options(smbd_server_fd(), lp_socket_options());
 809         }
 810
 811         mangle_reset_cache();
 812         reset_stat_cache();
 813
 814         /* this forces service parameters to be flushed */
 815         set_current_service(NULL,0,True);
 816
 817         return(ret);
 818 }
 819
 820 /****************************************************************************
 821  Exit the server.
 822 ****************************************************************************/
 823
 824 /* Reasons for shutting down a server process. */
 825 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 826
 827 static void exit_server_common(enum server_exit_reason how,
 828         const char *const reason) _NORETURN_;
 829
 830 static void exit_server_common(enum server_exit_reason how,
 831         const char *const reason)
 832 {
 833         bool had_open_conn = false;
 834         struct smbd_server_connection *sconn = smbd_server_conn;
 835
 836         if (!exit_firsttime)
 837                 exit(0);
 838         exit_firsttime = false;
 839
 840         change_to_root_user();
 841
 842         if (sconn && sconn->smb1.negprot.auth_context) {
 843                 struct auth_context *a = sconn->smb1.negprot.auth_context;
 844                 a->free(&sconn->smb1.negprot.auth_context);
 845         }
 846
 847         if (sconn) {
 848                 had_open_conn = conn_close_all(sconn);
 849                 invalidate_all_vuids(sconn);
 850         }
 851
 852         /* 3 second timeout. */
 853         print_notify_send_messages(smbd_messaging_context(), 3);
 854
 855         /* delete our entry in the connections database. */
 856         yield_connection(NULL,"");
 857
 858 #ifdef WITH_DFS
 859         if (dcelogin_atmost_once) {
 860                 dfs_unlogin();
 861         }
 862 #endif
 863
 864 #ifdef USE_DMAPI
 865         /* Destroy Samba DMAPI session only if we are master smbd process */
 866         if (am_parent) {
 867                 if (!dmapi_destroy_session()) {
 868                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 869                 }
 870         }
 871 #endif
 872
 873         locking_end();
 874         printing_end();
 875
 876         /*
 877          * we need to force the order of freeing the following,
 878          * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
 879          */
 880         sconn = NULL;
 881         TALLOC_FREE(smbd_server_conn);
 882         TALLOC_FREE(smbd_msg_ctx);
 883         TALLOC_FREE(smbd_event_ctx);
 884
 885         if (how != SERVER_EXIT_NORMAL) {
 886                 int oldlevel = DEBUGLEVEL;
 887
 888                 DEBUGLEVEL = 10;
 889
 890                 DEBUGSEP(0);
 891                 DEBUG(0,("Abnormal server exit: %s\n",
 892                         reason ? reason : "no explanation provided"));
 893                 DEBUGSEP(0);
 894
 895                 log_stack_trace();
 896
 897                 DEBUGLEVEL = oldlevel;
 898                 dump_core();
 899
 900         } else {
 901                 DEBUG(3,("Server exit (%s)\n",
 902                         (reason ? reason : "normal exit")));
 903                 if (am_parent) {
 904                         pidfile_unlink();
 905                 }
 906                 gencache_stabilize();
 907         }
 908
 909         /* if we had any open SMB connections when we exited then we
 910            need to tell the parent smbd so that it can trigger a retry
 911            of any locks we may have been holding or open files we were
 912            blocking */
 913         if (had_open_conn) {
 914                 exit(1);
 915         } else {
 916                 exit(0);
 917         }
 918 }
 919
 920 void exit_server(const char *const explanation)
 921 {
 922         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 923 }
 924
 925 void exit_server_cleanly(const char *const explanation)
 926 {
 927         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 928 }
 929
 930 void exit_server_fault(void)
 931 {
 932         exit_server("critical server fault");
 933 }
 934
 935 /****************************************************************************
 936  Initialise connect, service and file structs.
 937 ****************************************************************************/
 938
 939 static bool init_structs(void )
 940 {
 941         /*
 942          * Set the machine NETBIOS name if not already
 943          * set from the config file.
 944          */
 945
 946         if (!init_names())
 947                 return False;
 948
 949         file_init();
 950
 951         if (!secrets_init())
 952                 return False;
 953
 954         return True;
 955 }
 956
 957 /****************************************************************************
 958  main program.
 959 ****************************************************************************/
 960
 961 /* Declare prototype for build_options() to avoid having to run it through
 962    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 963    prototype generation system is too complicated. */
 964
 965 extern void build_options(bool screen);
 966
 967  int main(int argc,const char *argv[])
 968 {
 969         /* shall I run as a daemon */
 970         bool is_daemon = false;
 971         bool interactive = false;
 972         bool Fork = true;
 973         bool no_process_group = false;
 974         bool log_stdout = false;
 975         char *ports = NULL;
 976         char *profile_level = NULL;
 977         int opt;
 978         poptContext pc;
 979         bool print_build_options = False;
 980         enum {
 981                 OPT_DAEMON = 1000,
 982                 OPT_INTERACTIVE,
 983                 OPT_FORK,
 984                 OPT_NO_PROCESS_GROUP,
 985                 OPT_LOG_STDOUT
 986         };
 987         struct poptOption long_options[] = {
 988         POPT_AUTOHELP
 989         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 990         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 991         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 992         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 993         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 994         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 995         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 996         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 997         POPT_COMMON_SAMBA
 998         POPT_COMMON_DYNCONFIG
 999         POPT_TABLEEND
1000         };
1001         struct smbd_parent_context *parent = NULL;
1002         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1003
1004         smbd_init_globals();
1005
1006         TimeInit();
1007
1008 #ifdef HAVE_SET_AUTH_PARAMETERS
1009         set_auth_parameters(argc,argv);
1010 #endif
1011
1012         pc = poptGetContext("smbd", argc, argv, long_options, 0);
1013         while((opt = poptGetNextOpt(pc)) != -1) {
1014                 switch (opt)  {
1015                 case OPT_DAEMON:
1016                         is_daemon = true;
1017                         break;
1018                 case OPT_INTERACTIVE:
1019                         interactive = true;
1020                         break;
1021                 case OPT_FORK:
1022                         Fork = false;
1023                         break;
1024                 case OPT_NO_PROCESS_GROUP:
1025                         no_process_group = true;
1026                         break;
1027                 case OPT_LOG_STDOUT:
1028                         log_stdout = true;
1029                         break;
1030                 case 'b':
1031                         print_build_options = True;
1032                         break;
1033                 default:
1034                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1035                                   poptBadOption(pc, 0), poptStrerror(opt));
1036                         poptPrintUsage(pc, stderr, 0);
1037                         exit(1);
1038                 }
1039         }
1040         poptFreeContext(pc);
1041
1042         if (interactive) {
1043                 Fork = False;
1044                 log_stdout = True;
1045         }
1046
1047         setup_logging(argv[0],log_stdout);
1048
1049         if (print_build_options) {
1050                 build_options(True); /* Display output to screen as well as debug */
1051                 exit(0);
1052         }
1053
1054         load_case_tables();
1055
1056 #ifdef HAVE_SETLUID
1057         /* needed for SecureWare on SCO */
1058         setluid(0);
1059 #endif
1060
1061         sec_init();
1062
1063         set_remote_machine_name("smbd", False);
1064
1065         if (interactive && (DEBUGLEVEL >= 9)) {
1066                 talloc_enable_leak_report();
1067         }
1068
1069         if (log_stdout && Fork) {
1070                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1071                 exit(1);
1072         }
1073
1074         /* we want to re-seed early to prevent time delays causing
1075            client problems at a later date. (tridge) */
1076         generate_random_buffer(NULL, 0);
1077
1078         /* make absolutely sure we run as root - to handle cases where people
1079            are crazy enough to have it setuid */
1080
1081         gain_root_privilege();
1082         gain_root_group_privilege();
1083
1084         /*
1085          * Ensure we have CAP_KILL capability set on Linux,
1086          * where we need this to communicate with threads.
1087          * This is inherited by new threads, but not by new
1088          * processes across exec().
1089          */
1090         set_effective_capability(KILL_CAPABILITY);
1091
1092         fault_setup((void (*)(void *))exit_server_fault);
1093         dump_core_setup("smbd");
1094
1095         /* we are never interested in SIGPIPE */
1096         BlockSignals(True,SIGPIPE);
1097
1098 #if defined(SIGFPE)
1099         /* we are never interested in SIGFPE */
1100         BlockSignals(True,SIGFPE);
1101 #endif
1102
1103 #if defined(SIGUSR2)
1104         /* We are no longer interested in USR2 */
1105         BlockSignals(True,SIGUSR2);
1106 #endif
1107
1108         /* POSIX demands that signals are inherited. If the invoking process has
1109          * these signals masked, we will have problems, as we won't recieve them. */
1110         BlockSignals(False, SIGHUP);
1111         BlockSignals(False, SIGUSR1);
1112         BlockSignals(False, SIGTERM);
1113
1114         /* Ensure we leave no zombies until we
1115          * correctly set up child handling below. */
1116
1117         CatchChild();
1118
1119         /* we want total control over the permissions on created files,
1120            so set our umask to 0 */
1121         umask(0);
1122
1123         init_sec_ctx();
1124
1125         reopen_logs();
1126
1127         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1128         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1129
1130         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1131                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1132
1133         /* Output the build options to the debug log */
1134         build_options(False);
1135
1136         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1137                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1138                 exit(1);
1139         }
1140
1141         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1142                 DEBUG(0, ("error opening config file\n"));
1143                 exit(1);
1144         }
1145
1146         if (smbd_messaging_context() == NULL)
1147                 exit(1);
1148
1149         if (!reload_services(False))
1150                 return(-1);
1151
1152         init_structs();
1153
1154 #ifdef WITH_PROFILE
1155         if (!profile_setup(smbd_messaging_context(), False)) {
1156                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1157                 return -1;
1158         }
1159         if (profile_level != NULL) {
1160                 int pl = atoi(profile_level);
1161                 struct server_id src;
1162
1163                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1164                 src.pid = getpid();
1165                 set_profile_level(pl, src);
1166         }
1167 #endif
1168
1169         DEBUG(3,( "loaded services\n"));
1170
1171         if (!is_daemon && !is_a_socket(0)) {
1172                 if (!interactive)
1173                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1174
1175                 /*
1176                  * Setting is_daemon here prevents us from eventually calling
1177                  * the open_sockets_inetd()
1178                  */
1179
1180                 is_daemon = True;
1181         }
1182
1183         if (is_daemon && !interactive) {
1184                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1185                 become_daemon(Fork, no_process_group);
1186         }
1187
1188 #if HAVE_SETPGID
1189         /*
1190          * If we're interactive we want to set our own process group for
1191          * signal management.
1192          */
1193         if (interactive && !no_process_group)
1194                 setpgid( (pid_t)0, (pid_t)0);
1195 #endif
1196
1197         if (!directory_exist(lp_lockdir()))
1198                 mkdir(lp_lockdir(), 0755);
1199
1200         if (is_daemon)
1201                 pidfile_create("smbd");
1202
1203         if (!NT_STATUS_IS_OK(reinit_after_fork(smbd_messaging_context(),
1204                              smbd_event_context(), false))) {
1205                 DEBUG(0,("reinit_after_fork() failed\n"));
1206                 exit(1);
1207         }
1208
1209         smbd_setup_sig_term_handler();
1210         smbd_setup_sig_hup_handler();
1211
1212         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1213
1214         if (smbd_memcache() == NULL) {
1215                 exit(1);
1216         }
1217
1218         memcache_set_global(smbd_memcache());
1219
1220         /* Initialise the password backed before the global_sam_sid
1221            to ensure that we fetch from ldap before we make a domain sid up */
1222
1223         if(!initialize_password_db(False, smbd_event_context()))
1224                 exit(1);
1225
1226         if (!secrets_init()) {
1227                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1228                 exit(1);
1229         }
1230
1231         if(!get_global_sam_sid()) {
1232                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1233                 exit(1);
1234         }
1235
1236         if (!session_init())
1237                 exit(1);
1238
1239         if (!connections_init(True))
1240                 exit(1);
1241
1242         if (!locking_init())
1243                 exit(1);
1244
1245         namecache_enable();
1246
1247         if (!W_ERROR_IS_OK(registry_init_full()))
1248                 exit(1);
1249
1250 #if 0
1251         if (!init_svcctl_db())
1252                 exit(1);
1253 #endif
1254
1255         if (!print_backend_init(smbd_messaging_context()))
1256                 exit(1);
1257
1258         if (!init_guest_info()) {
1259                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1260                 return -1;
1261         }
1262
1263         /* Open the share_info.tdb here, so we don't have to open
1264            after the fork on every single connection.  This is a small
1265            performance improvment and reduces the total number of system
1266            fds used. */
1267         if (!share_info_db_init()) {
1268                 DEBUG(0,("ERROR: failed to load share info db.\n"));
1269                 exit(1);
1270         }
1271
1272         /* only start the background queue daemon if we are
1273            running as a daemon -- bad things will happen if
1274            smbd is launched via inetd and we fork a copy of
1275            ourselves here */
1276
1277         if (is_daemon && !interactive
1278             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1279                 start_background_queue();
1280         }
1281
1282         if (!is_daemon) {
1283                 /* inetd mode */
1284                 TALLOC_FREE(frame);
1285
1286                 /* Started from inetd. fd 0 is the socket. */
1287                 /* We will abort gracefully when the client or remote system
1288                    goes away */
1289                 smbd_set_server_fd(dup(0));
1290
1291                 /* close our standard file descriptors */
1292                 close_low_fds(False); /* Don't close stderr */
1293
1294 #ifdef HAVE_ATEXIT
1295                 atexit(killkids);
1296 #endif
1297
1298                 /* Stop zombies */
1299                 smbd_setup_sig_chld_handler();
1300
1301                 smbd_process();
1302
1303                 exit_server_cleanly(NULL);
1304                 return(0);
1305         }
1306
1307         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1308         if (!parent) {
1309                 exit_server("talloc(struct smbd_parent_context) failed");
1310         }
1311         parent->interactive = interactive;
1312
1313         if (!open_sockets_smbd(parent, ports))
1314                 exit_server("open_sockets_smbd() failed");
1315
1316         TALLOC_FREE(frame);
1317
1318         smbd_parent_loop(parent);
1319
1320         exit_server_cleanly(NULL);
1321         return(0);
1322 }