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