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 "system/filesys.h"
  26 #include "popt_common.h"
  27 #include "smbd/smbd.h"
  28 #include "smbd/globals.h"
  29 #include "registry/reg_init_full.h"
  30 #include "libcli/auth/schannel.h"
  31 #include "secrets.h"
  32 #include "memcache.h"
  33 #include "ctdbd_conn.h"
  34 #include "printing/printer_list.h"
  35 #include "rpc_server/rpc_ep_setup.h"
  36 #include "printing/pcap.h"
  37 #include "printing.h"
  38 #include "serverid.h"
  39 #include "passdb.h"
  40 #include "auth.h"
  41 #include "messages.h"
  42 #include "smbprofile.h"
  43
  44 extern void start_epmd(struct tevent_context *ev_ctx,
  45                        struct messaging_context *msg_ctx);
  46
  47 extern void start_spoolssd(struct event_context *ev_ctx,
  48                            struct messaging_context *msg_ctx);
  49
  50 #ifdef WITH_DFS
  51 extern int dcelogin_atmost_once;
  52 #endif /* WITH_DFS */
  53
  54 static void smbd_set_server_fd(int fd)
  55 {
  56         struct smbd_server_connection *sconn = smbd_server_conn;
  57         char addr[INET6_ADDRSTRLEN];
  58         const char *name;
  59
  60         sconn->sock = fd;
  61
  62         /*
  63          * Initialize sconn->client_id: If we can't find the client's
  64          * name, default to its address.
  65          */
  66
  67         if (sconn->client_id.name != NULL &&
  68             sconn->client_id.name != sconn->client_id.addr) {
  69                 talloc_free(discard_const_p(char, sconn->client_id.name));
  70                 sconn->client_id.name = NULL;
  71         }
  72
  73         client_addr(fd, sconn->client_id.addr, sizeof(sconn->client_id.addr));
  74
  75         name = client_name(sconn->sock);
  76         if (strcmp(name, "UNKNOWN") != 0) {
  77                 name = talloc_strdup(sconn, name);
  78         } else {
  79                 name = NULL;
  80         }
  81         sconn->client_id.name =
  82                 (name != NULL) ? name : sconn->client_id.addr;
  83
  84         sub_set_socket_ids(sconn->client_id.addr, sconn->client_id.name,
  85                            client_socket_addr(sconn->sock, addr,
  86                                               sizeof(addr)));
  87 }
  88
  89 struct event_context *smbd_event_context(void)
  90 {
  91         return server_event_context();
  92 }
  93
  94 /*******************************************************************
  95  What to do when smb.conf is updated.
  96  ********************************************************************/
  97
  98 static void smb_conf_updated(struct messaging_context *msg,
  99                              void *private_data,
 100                              uint32_t msg_type,
 101                              struct server_id server_id,
 102                              DATA_BLOB *data)
 103 {
 104         struct tevent_context *ev_ctx =
 105                 talloc_get_type_abort(private_data, struct tevent_context);
 106
 107         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
 108                   "updated. Reloading.\n"));
 109         change_to_root_user();
 110         reload_services(msg, smbd_server_conn->sock, False);
 111         reload_printers(ev_ctx, msg);
 112 }
 113
 114 /*******************************************************************
 115  What to do when printcap is updated.
 116  ********************************************************************/
 117
 118 static void smb_pcap_updated(struct messaging_context *msg,
 119                              void *private_data,
 120                              uint32_t msg_type,
 121                              struct server_id server_id,
 122                              DATA_BLOB *data)
 123 {
 124         struct tevent_context *ev_ctx =
 125                 talloc_get_type_abort(private_data, struct tevent_context);
 126
 127         DEBUG(10,("Got message saying pcap was updated. Reloading.\n"));
 128         change_to_root_user();
 129         reload_printers(ev_ctx, msg);
 130 }
 131
 132 /*******************************************************************
 133  Delete a statcache entry.
 134  ********************************************************************/
 135
 136 static void smb_stat_cache_delete(struct messaging_context *msg,
 137                                   void *private_data,
 138                                   uint32_t msg_tnype,
 139                                   struct server_id server_id,
 140                                   DATA_BLOB *data)
 141 {
 142         const char *name = (const char *)data->data;
 143         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 144         stat_cache_delete(name);
 145 }
 146
 147 /****************************************************************************
 148   Send a SIGTERM to our process group.
 149 *****************************************************************************/
 150
 151 static void  killkids(void)
 152 {
 153         if(am_parent) kill(0,SIGTERM);
 154 }
 155
 156 /****************************************************************************
 157  Process a sam sync message - not sure whether to do this here or
 158  somewhere else.
 159 ****************************************************************************/
 160
 161 static void msg_sam_sync(struct messaging_context *msg,
 162                          void *private_data,
 163                          uint32_t msg_type,
 164                          struct server_id server_id,
 165                          DATA_BLOB *data)
 166 {
 167         DEBUG(10, ("** sam sync message received, ignoring\n"));
 168 }
 169
 170 static void msg_exit_server(struct messaging_context *msg,
 171                             void *private_data,
 172                             uint32_t msg_type,
 173                             struct server_id server_id,
 174                             DATA_BLOB *data)
 175 {
 176         DEBUG(3, ("got a SHUTDOWN message\n"));
 177         exit_server_cleanly(NULL);
 178 }
 179
 180 #ifdef DEVELOPER
 181 static void msg_inject_fault(struct messaging_context *msg,
 182                              void *private_data,
 183                              uint32_t msg_type,
 184                              struct server_id src,
 185                              DATA_BLOB *data)
 186 {
 187         int sig;
 188
 189         if (data->length != sizeof(sig)) {
 190                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 191                           procid_str_static(&src)));
 192                 return;
 193         }
 194
 195         sig = *(int *)data->data;
 196         if (sig == -1) {
 197                 exit_server("internal error injected");
 198                 return;
 199         }
 200
 201 #if HAVE_STRSIGNAL
 202         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 203                   procid_str_static(&src), sig, strsignal(sig)));
 204 #else
 205         DEBUG(0, ("Process %s requested injection of signal %d\n",
 206                   procid_str_static(&src), sig));
 207 #endif
 208
 209         kill(sys_getpid(), sig);
 210 }
 211 #endif /* DEVELOPER */
 212
 213 /*
 214  * Parent smbd process sets its own debug level first and then
 215  * sends a message to all the smbd children to adjust their debug
 216  * level to that of the parent.
 217  */
 218
 219 static void smbd_msg_debug(struct messaging_context *msg_ctx,
 220                            void *private_data,
 221                            uint32_t msg_type,
 222                            struct server_id server_id,
 223                            DATA_BLOB *data)
 224 {
 225         struct child_pid *child;
 226
 227         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 228
 229         for (child = children; child != NULL; child = child->next) {
 230                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 231                                    MSG_DEBUG,
 232                                    data->data,
 233                                    strlen((char *) data->data) + 1);
 234         }
 235 }
 236
 237 static void add_child_pid(pid_t pid)
 238 {
 239         struct child_pid *child;
 240
 241         child = SMB_MALLOC_P(struct child_pid);
 242         if (child == NULL) {
 243                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 244                 return;
 245         }
 246         child->pid = pid;
 247         DLIST_ADD(children, child);
 248         num_children += 1;
 249 }
 250
 251 /*
 252   at most every smbd:cleanuptime seconds (default 20), we scan the BRL
 253   and locking database for entries to cleanup. As a side effect this
 254   also cleans up dead entries in the connections database (due to the
 255   traversal in message_send_all()
 256
 257   Using a timer for this prevents a flood of traversals when a large
 258   number of clients disconnect at the same time (perhaps due to a
 259   network outage).
 260 */
 261
 262 static void cleanup_timeout_fn(struct event_context *event_ctx,
 263                                 struct timed_event *te,
 264                                 struct timeval now,
 265                                 void *private_data)
 266 {
 267         struct timed_event **cleanup_te = (struct timed_event **)private_data;
 268
 269         DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
 270         message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
 271         messaging_send_buf(smbd_messaging_context(), procid_self(),
 272                                 MSG_SMB_BRL_VALIDATE, NULL, 0);
 273         /* mark the cleanup as having been done */
 274         (*cleanup_te) = NULL;
 275 }
 276
 277 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 278 {
 279         struct child_pid *child;
 280         static struct timed_event *cleanup_te;
 281         struct server_id child_id;
 282
 283         child_id = procid_self(); /* Just initialize pid and potentially vnn */
 284         child_id.pid = pid;
 285
 286         for (child = children; child != NULL; child = child->next) {
 287                 if (child->pid == pid) {
 288                         struct child_pid *tmp = child;
 289                         DLIST_REMOVE(children, child);
 290                         SAFE_FREE(tmp);
 291                         num_children -= 1;
 292                         break;
 293                 }
 294         }
 295
 296         if (child == NULL) {
 297                 /* not all forked child processes are added to the children list */
 298                 DEBUG(2, ("Could not find child %d -- ignoring\n", (int)pid));
 299                 return;
 300         }
 301
 302         if (unclean_shutdown) {
 303                 /* a child terminated uncleanly so tickle all
 304                    processes to see if they can grab any of the
 305                    pending locks
 306                 */
 307                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
 308                         (unsigned int)pid));
 309                 if (!cleanup_te) {
 310                         /* call the cleanup timer, but not too often */
 311                         int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
 312                         cleanup_te = event_add_timed(smbd_event_context(), NULL,
 313                                                 timeval_current_ofs(cleanup_time, 0),
 314                                                 cleanup_timeout_fn,
 315                                                 &cleanup_te);
 316                         DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
 317                 }
 318         }
 319
 320         if (!serverid_deregister(child_id)) {
 321                 DEBUG(1, ("Could not remove pid %d from serverid.tdb\n",
 322                           (int)pid));
 323         }
 324 }
 325
 326 /****************************************************************************
 327  Have we reached the process limit ?
 328 ****************************************************************************/
 329
 330 static bool allowable_number_of_smbd_processes(void)
 331 {
 332         int max_processes = lp_max_smbd_processes();
 333
 334         if (!max_processes)
 335                 return True;
 336
 337         return num_children < max_processes;
 338 }
 339
 340 static void smbd_sig_chld_handler(struct tevent_context *ev,
 341                                   struct tevent_signal *se,
 342                                   int signum,
 343                                   int count,
 344                                   void *siginfo,
 345                                   void *private_data)
 346 {
 347         pid_t pid;
 348         int status;
 349
 350         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 351                 bool unclean_shutdown = False;
 352
 353                 /* If the child terminated normally, assume
 354                    it was an unclean shutdown unless the
 355                    status is 0
 356                 */
 357                 if (WIFEXITED(status)) {
 358                         unclean_shutdown = WEXITSTATUS(status);
 359                 }
 360                 /* If the child terminated due to a signal
 361                    we always assume it was unclean.
 362                 */
 363                 if (WIFSIGNALED(status)) {
 364                         unclean_shutdown = True;
 365                 }
 366                 remove_child_pid(pid, unclean_shutdown);
 367         }
 368 }
 369
 370 static void smbd_setup_sig_chld_handler(void)
 371 {
 372         struct tevent_signal *se;
 373
 374         se = tevent_add_signal(smbd_event_context(),
 375                                smbd_event_context(),
 376                                SIGCHLD, 0,
 377                                smbd_sig_chld_handler,
 378                                NULL);
 379         if (!se) {
 380                 exit_server("failed to setup SIGCHLD handler");
 381         }
 382 }
 383
 384 struct smbd_open_socket;
 385
 386 struct smbd_parent_context {
 387         bool interactive;
 388
 389         /* the list of listening sockets */
 390         struct smbd_open_socket *sockets;
 391 };
 392
 393 struct smbd_open_socket {
 394         struct smbd_open_socket *prev, *next;
 395         struct smbd_parent_context *parent;
 396         int fd;
 397         struct tevent_fd *fde;
 398 };
 399
 400 static void smbd_open_socket_close_fn(struct tevent_context *ev,
 401                                       struct tevent_fd *fde,
 402                                       int fd,
 403                                       void *private_data)
 404 {
 405         /* this might be the socket_wrapper swrap_close() */
 406         close(fd);
 407 }
 408
 409 static void smbd_accept_connection(struct tevent_context *ev,
 410                                    struct tevent_fd *fde,
 411                                    uint16_t flags,
 412                                    void *private_data)
 413 {
 414         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
 415                                      struct smbd_open_socket);
 416         struct sockaddr_storage addr;
 417         socklen_t in_addrlen = sizeof(addr);
 418         int fd;
 419         pid_t pid = 0;
 420         uint64_t unique_id;
 421
 422         fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
 423         smbd_set_server_fd(fd);
 424
 425         if (fd == -1 && errno == EINTR)
 426                 return;
 427
 428         if (fd == -1) {
 429                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 430                          strerror(errno)));
 431                 return;
 432         }
 433
 434         if (s->parent->interactive) {
 435                 smbd_process(smbd_server_conn);
 436                 exit_server_cleanly("end of interactive mode");
 437                 return;
 438         }
 439
 440         if (!allowable_number_of_smbd_processes()) {
 441                 close(fd);
 442                 smbd_set_server_fd(-1);
 443                 return;
 444         }
 445
 446         /*
 447          * Generate a unique id in the parent process so that we use
 448          * the global random state in the parent.
 449          */
 450         unique_id = serverid_get_random_unique_id();
 451
 452         pid = sys_fork();
 453         if (pid == 0) {
 454                 NTSTATUS status = NT_STATUS_OK;
 455
 456                 /* Child code ... */
 457                 am_parent = 0;
 458
 459                 set_my_unique_id(unique_id);
 460
 461                 /* Stop zombies, the parent explicitly handles
 462                  * them, counting worker smbds. */
 463                 CatchChild();
 464
 465                 /* close our standard file
 466                    descriptors */
 467                 close_low_fds(False);
 468
 469                 /*
 470                  * Can't use TALLOC_FREE here. Nulling out the argument to it
 471                  * would overwrite memory we've just freed.
 472                  */
 473                 talloc_free(s->parent);
 474                 s = NULL;
 475
 476                 status = reinit_after_fork(smbd_messaging_context(),
 477                                            smbd_event_context(), procid_self(),
 478                                            true);
 479                 if (!NT_STATUS_IS_OK(status)) {
 480                         if (NT_STATUS_EQUAL(status,
 481                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
 482                                 DEBUG(0,("child process cannot initialize "
 483                                          "because too many files are open\n"));
 484                                 goto exit;
 485                         }
 486                         if (lp_clustering() &&
 487                             NT_STATUS_EQUAL(status,
 488                             NT_STATUS_INTERNAL_DB_ERROR)) {
 489                                 DEBUG(1,("child process cannot initialize "
 490                                          "because connection to CTDB "
 491                                          "has failed\n"));
 492                                 goto exit;
 493                         }
 494
 495                         DEBUG(0,("reinit_after_fork() failed\n"));
 496                         smb_panic("reinit_after_fork() failed");
 497                 }
 498
 499                 smbd_setup_sig_term_handler();
 500                 smbd_setup_sig_hup_handler(server_event_context(),
 501                                            server_messaging_context());
 502
 503                 if (!serverid_register(procid_self(),
 504                                        FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 505                                        |FLAG_MSG_DBWRAP
 506                                        |FLAG_MSG_PRINT_GENERAL)) {
 507                         exit_server_cleanly("Could not register myself in "
 508                                             "serverid.tdb");
 509                 }
 510
 511                 smbd_process(smbd_server_conn);
 512          exit:
 513                 exit_server_cleanly("end of child");
 514                 return;
 515         }
 516
 517         if (pid < 0) {
 518                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
 519                          strerror(errno)));
 520         }
 521
 522         /* The parent doesn't need this socket */
 523         close(fd);
 524
 525         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 526                 Clear the closed fd info out of server_fd --
 527                 and more importantly, out of client_fd in
 528                 util_sock.c, to avoid a possible
 529                 getpeername failure if we reopen the logs
 530                 and use %I in the filename.
 531         */
 532
 533         smbd_set_server_fd(-1);
 534
 535         if (pid != 0) {
 536                 add_child_pid(pid);
 537         }
 538
 539         /* Force parent to check log size after
 540          * spawning child.  Fix from
 541          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 542          * parent smbd will log to logserver.smb.  It
 543          * writes only two messages for each child
 544          * started/finished. But each child writes,
 545          * say, 50 messages also in logserver.smb,
 546          * begining with the debug_count of the
 547          * parent, before the child opens its own log
 548          * file logserver.client. In a worst case
 549          * scenario the size of logserver.smb would be
 550          * checked after about 50*50=2500 messages
 551          * (ca. 100kb).
 552          * */
 553         force_check_log_size();
 554 }
 555
 556 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
 557                                  const struct sockaddr_storage *ifss,
 558                                  uint16_t port)
 559 {
 560         struct smbd_open_socket *s;
 561
 562         s = talloc(parent, struct smbd_open_socket);
 563         if (!s) {
 564                 return false;
 565         }
 566
 567         s->parent = parent;
 568         s->fd = open_socket_in(SOCK_STREAM,
 569                                port,
 570                                parent->sockets == NULL ? 0 : 2,
 571                                ifss,
 572                                true);
 573         if (s->fd == -1) {
 574                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
 575                         "%s\n", strerror(errno)));
 576                 TALLOC_FREE(s);
 577                 /*
 578                  * We ignore an error here, as we've done before
 579                  */
 580                 return true;
 581         }
 582
 583         /* ready to listen */
 584         set_socket_options(s->fd, "SO_KEEPALIVE");
 585         set_socket_options(s->fd, lp_socket_options());
 586
 587         /* Set server socket to
 588          * non-blocking for the accept. */
 589         set_blocking(s->fd, False);
 590
 591         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
 592                 DEBUG(0,("open_sockets_smbd: listen: "
 593                         "%s\n", strerror(errno)));
 594                         close(s->fd);
 595                 TALLOC_FREE(s);
 596                 return false;
 597         }
 598
 599         s->fde = tevent_add_fd(smbd_event_context(),
 600                                s,
 601                                s->fd, TEVENT_FD_READ,
 602                                smbd_accept_connection,
 603                                s);
 604         if (!s->fde) {
 605                 DEBUG(0,("open_sockets_smbd: "
 606                          "tevent_add_fd: %s\n",
 607                          strerror(errno)));
 608                 close(s->fd);
 609                 TALLOC_FREE(s);
 610                 return false;
 611         }
 612         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
 613
 614         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
 615
 616         return true;
 617 }
 618
 619 /****************************************************************************
 620  Open the socket communication.
 621 ****************************************************************************/
 622
 623 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 624                               struct messaging_context *msg_ctx,
 625                               const char *smb_ports)
 626 {
 627         int num_interfaces = iface_count();
 628         int i;
 629         char *ports;
 630         char *tok;
 631         const char *ptr;
 632         unsigned dns_port = 0;
 633
 634 #ifdef HAVE_ATEXIT
 635         atexit(killkids);
 636 #endif
 637
 638         /* Stop zombies */
 639         smbd_setup_sig_chld_handler();
 640
 641         /* use a reasonable default set of ports - listing on 445 and 139 */
 642         if (!smb_ports) {
 643                 ports = lp_smb_ports();
 644                 if (!ports || !*ports) {
 645                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 646                 } else {
 647                         ports = talloc_strdup(talloc_tos(), ports);
 648                 }
 649         } else {
 650                 ports = talloc_strdup(talloc_tos(), smb_ports);
 651         }
 652
 653         for (ptr = ports;
 654              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 655                 unsigned port = atoi(tok);
 656
 657                 if (port == 0 || port > 0xffff) {
 658                         exit_server_cleanly("Invalid port in the config or on "
 659                                             "the commandline specified!");
 660                 }
 661         }
 662
 663         if (lp_interfaces() && lp_bind_interfaces_only()) {
 664                 /* We have been given an interfaces line, and been
 665                    told to only bind to those interfaces. Create a
 666                    socket per interface and bind to only these.
 667                 */
 668
 669                 /* Now open a listen socket for each of the
 670                    interfaces. */
 671                 for(i = 0; i < num_interfaces; i++) {
 672                         const struct sockaddr_storage *ifss =
 673                                         iface_n_sockaddr_storage(i);
 674
 675                         if (ifss == NULL) {
 676                                 DEBUG(0,("open_sockets_smbd: "
 677                                         "interface %d has NULL IP address !\n",
 678                                         i));
 679                                 continue;
 680                         }
 681
 682                         for (ptr=ports;
 683                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 684                                 unsigned port = atoi(tok);
 685
 686                                 /* Keep the first port for mDNS service
 687                                  * registration.
 688                                  */
 689                                 if (dns_port == 0) {
 690                                         dns_port = port;
 691                                 }
 692
 693                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 694                                         return false;
 695                                 }
 696                         }
 697                 }
 698         } else {
 699                 /* Just bind to 0.0.0.0 - accept connections
 700                    from anywhere. */
 701
 702                 const char *sock_addr = lp_socket_address();
 703                 char *sock_tok;
 704                 const char *sock_ptr;
 705
 706                 if (strequal(sock_addr, "0.0.0.0") ||
 707                     strequal(sock_addr, "::")) {
 708 #if HAVE_IPV6
 709                         sock_addr = "::,0.0.0.0";
 710 #else
 711                         sock_addr = "0.0.0.0";
 712 #endif
 713                 }
 714
 715                 for (sock_ptr=sock_addr;
 716                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 717                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 718                                 struct sockaddr_storage ss;
 719                                 unsigned port = atoi(tok);
 720
 721                                 /* Keep the first port for mDNS service
 722                                  * registration.
 723                                  */
 724                                 if (dns_port == 0) {
 725                                         dns_port = port;
 726                                 }
 727
 728                                 /* open an incoming socket */
 729                                 if (!interpret_string_addr(&ss, sock_tok,
 730                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 731                                         continue;
 732                                 }
 733
 734                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 735                                         return false;
 736                                 }
 737                         }
 738                 }
 739         }
 740
 741         if (parent->sockets == NULL) {
 742                 DEBUG(0,("open_sockets_smbd: No "
 743                         "sockets available to bind to.\n"));
 744                 return false;
 745         }
 746
 747         /* Setup the main smbd so that we can get messages. Note that
 748            do this after starting listening. This is needed as when in
 749            clustered mode, ctdb won't allow us to start doing database
 750            operations until it has gone thru a full startup, which
 751            includes checking to see that smbd is listening. */
 752
 753         if (!serverid_register(procid_self(),
 754                                FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 755                                |FLAG_MSG_DBWRAP)) {
 756                 DEBUG(0, ("open_sockets_smbd: Failed to register "
 757                           "myself in serverid.tdb\n"));
 758                 return false;
 759         }
 760
 761         /* Listen to messages */
 762
 763         messaging_register(msg_ctx, NULL, MSG_SMB_SAM_SYNC, msg_sam_sync);
 764         messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
 765         messaging_register(msg_ctx, NULL, MSG_SMB_FILE_RENAME,
 766                            msg_file_was_renamed);
 767         messaging_register(msg_ctx, server_event_context(), MSG_SMB_CONF_UPDATED,
 768                            smb_conf_updated);
 769         messaging_register(msg_ctx, NULL, MSG_SMB_STAT_CACHE_DELETE,
 770                            smb_stat_cache_delete);
 771         messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
 772         brl_register_msgs(msg_ctx);
 773
 774         msg_idmap_register_msgs(msg_ctx);
 775
 776 #ifdef CLUSTER_SUPPORT
 777         if (lp_clustering()) {
 778                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 779         }
 780 #endif
 781
 782 #ifdef DEVELOPER
 783         messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
 784                            msg_inject_fault);
 785 #endif
 786
 787         if (lp_multicast_dns_register() && (dns_port != 0)) {
 788 #ifdef WITH_DNSSD_SUPPORT
 789                 smbd_setup_mdns_registration(smbd_event_context(),
 790                                              parent, dns_port);
 791 #endif
 792 #ifdef WITH_AVAHI_SUPPORT
 793                 void *avahi_conn;
 794
 795                 avahi_conn = avahi_start_register(
 796                         smbd_event_context(), smbd_event_context(), dns_port);
 797                 if (avahi_conn == NULL) {
 798                         DEBUG(10, ("avahi_start_register failed\n"));
 799                 }
 800 #endif
 801         }
 802
 803         return true;
 804 }
 805
 806 static void smbd_parent_loop(struct smbd_parent_context *parent)
 807 {
 808         /* now accept incoming connections - forking a new process
 809            for each incoming connection */
 810         DEBUG(2,("waiting for connections\n"));
 811         while (1) {
 812                 int ret;
 813                 TALLOC_CTX *frame = talloc_stackframe();
 814
 815                 ret = tevent_loop_once(smbd_event_context());
 816                 if (ret != 0) {
 817                         exit_server_cleanly("tevent_loop_once() error");
 818                 }
 819
 820                 TALLOC_FREE(frame);
 821         } /* end while 1 */
 822
 823 /* NOTREACHED   return True; */
 824 }
 825
 826
 827 /****************************************************************************
 828  Initialise connect, service and file structs.
 829 ****************************************************************************/
 830
 831 static bool init_structs(void )
 832 {
 833         /*
 834          * Set the machine NETBIOS name if not already
 835          * set from the config file.
 836          */
 837
 838         if (!init_names())
 839                 return False;
 840
 841         if (!secrets_init())
 842                 return False;
 843
 844         return True;
 845 }
 846
 847 /****************************************************************************
 848  main program.
 849 ****************************************************************************/
 850
 851 /* Declare prototype for build_options() to avoid having to run it through
 852    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 853    prototype generation system is too complicated. */
 854
 855 extern void build_options(bool screen);
 856
 857  int main(int argc,const char *argv[])
 858 {
 859         /* shall I run as a daemon */
 860         bool is_daemon = false;
 861         bool interactive = false;
 862         bool Fork = true;
 863         bool no_process_group = false;
 864         bool log_stdout = false;
 865         char *ports = NULL;
 866         char *profile_level = NULL;
 867         int opt;
 868         poptContext pc;
 869         bool print_build_options = False;
 870         enum {
 871                 OPT_DAEMON = 1000,
 872                 OPT_INTERACTIVE,
 873                 OPT_FORK,
 874                 OPT_NO_PROCESS_GROUP,
 875                 OPT_LOG_STDOUT
 876         };
 877         struct poptOption long_options[] = {
 878         POPT_AUTOHELP
 879         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 880         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 881         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 882         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 883         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 884         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 885         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 886         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 887         POPT_COMMON_SAMBA
 888         POPT_COMMON_DYNCONFIG
 889         POPT_TABLEEND
 890         };
 891         struct smbd_parent_context *parent = NULL;
 892         TALLOC_CTX *frame;
 893         NTSTATUS status;
 894
 895         /*
 896          * Do this before any other talloc operation
 897          */
 898         talloc_enable_null_tracking();
 899         frame = talloc_stackframe();
 900
 901         load_case_tables();
 902
 903         /* Initialize the event context, it will panic on error */
 904         smbd_event_context();
 905
 906         smbd_init_globals();
 907
 908         TimeInit();
 909
 910 #ifdef HAVE_SET_AUTH_PARAMETERS
 911         set_auth_parameters(argc,argv);
 912 #endif
 913
 914         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 915         while((opt = poptGetNextOpt(pc)) != -1) {
 916                 switch (opt)  {
 917                 case OPT_DAEMON:
 918                         is_daemon = true;
 919                         break;
 920                 case OPT_INTERACTIVE:
 921                         interactive = true;
 922                         break;
 923                 case OPT_FORK:
 924                         Fork = false;
 925                         break;
 926                 case OPT_NO_PROCESS_GROUP:
 927                         no_process_group = true;
 928                         break;
 929                 case OPT_LOG_STDOUT:
 930                         log_stdout = true;
 931                         break;
 932                 case 'b':
 933                         print_build_options = True;
 934                         break;
 935                 default:
 936                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 937                                   poptBadOption(pc, 0), poptStrerror(opt));
 938                         poptPrintUsage(pc, stderr, 0);
 939                         exit(1);
 940                 }
 941         }
 942         poptFreeContext(pc);
 943
 944         if (interactive) {
 945                 Fork = False;
 946                 log_stdout = True;
 947         }
 948
 949         if (log_stdout) {
 950                 setup_logging(argv[0], DEBUG_STDOUT);
 951         } else {
 952                 setup_logging(argv[0], DEBUG_FILE);
 953         }
 954
 955         if (print_build_options) {
 956                 build_options(True); /* Display output to screen as well as debug */
 957                 exit(0);
 958         }
 959
 960 #ifdef HAVE_SETLUID
 961         /* needed for SecureWare on SCO */
 962         setluid(0);
 963 #endif
 964
 965         set_remote_machine_name("smbd", False);
 966
 967         if (interactive && (DEBUGLEVEL >= 9)) {
 968                 talloc_enable_leak_report();
 969         }
 970
 971         if (log_stdout && Fork) {
 972                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 973                 exit(1);
 974         }
 975
 976         /* we want to re-seed early to prevent time delays causing
 977            client problems at a later date. (tridge) */
 978         generate_random_buffer(NULL, 0);
 979
 980         /* get initial effective uid and gid */
 981         sec_init();
 982
 983         /* make absolutely sure we run as root - to handle cases where people
 984            are crazy enough to have it setuid */
 985         gain_root_privilege();
 986         gain_root_group_privilege();
 987
 988         fault_setup((void (*)(void *))exit_server_fault);
 989         dump_core_setup("smbd");
 990
 991         /* we are never interested in SIGPIPE */
 992         BlockSignals(True,SIGPIPE);
 993
 994 #if defined(SIGFPE)
 995         /* we are never interested in SIGFPE */
 996         BlockSignals(True,SIGFPE);
 997 #endif
 998
 999 #if defined(SIGUSR2)
1000         /* We are no longer interested in USR2 */
1001         BlockSignals(True,SIGUSR2);
1002 #endif
1003
1004         /* POSIX demands that signals are inherited. If the invoking process has
1005          * these signals masked, we will have problems, as we won't recieve them. */
1006         BlockSignals(False, SIGHUP);
1007         BlockSignals(False, SIGUSR1);
1008         BlockSignals(False, SIGTERM);
1009
1010         /* Ensure we leave no zombies until we
1011          * correctly set up child handling below. */
1012
1013         CatchChild();
1014
1015         /* we want total control over the permissions on created files,
1016            so set our umask to 0 */
1017         umask(0);
1018
1019         reopen_logs();
1020
1021         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1022         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1023
1024         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1025                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1026
1027         /* Output the build options to the debug log */
1028         build_options(False);
1029
1030         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1031                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1032                 exit(1);
1033         }
1034
1035         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1036                 DEBUG(0, ("error opening config file\n"));
1037                 exit(1);
1038         }
1039
1040         /* Init the security context and global current_user */
1041         init_sec_ctx();
1042
1043         if (smbd_messaging_context() == NULL)
1044                 exit(1);
1045
1046         /*
1047          * Reloading of the printers will not work here as we don't have a
1048          * server info and rpc services set up. It will be called later.
1049          */
1050         if (!reload_services(smbd_messaging_context(), -1, False)) {
1051                 exit(1);
1052         }
1053
1054         /* ...NOTE... Log files are working from this point! */
1055
1056         DEBUG(3,("loaded services\n"));
1057
1058         init_structs();
1059
1060 #ifdef WITH_PROFILE
1061         if (!profile_setup(smbd_messaging_context(), False)) {
1062                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1063                 return -1;
1064         }
1065         if (profile_level != NULL) {
1066                 int pl = atoi(profile_level);
1067                 struct server_id src;
1068
1069                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1070                 src.pid = getpid();
1071                 set_profile_level(pl, src);
1072         }
1073 #endif
1074
1075         if (!is_daemon && !is_a_socket(0)) {
1076                 if (!interactive)
1077                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1078
1079                 /*
1080                  * Setting is_daemon here prevents us from eventually calling
1081                  * the open_sockets_inetd()
1082                  */
1083
1084                 is_daemon = True;
1085         }
1086
1087         if (is_daemon && !interactive) {
1088                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1089                 become_daemon(Fork, no_process_group, log_stdout);
1090         }
1091
1092         set_my_unique_id(serverid_get_random_unique_id());
1093
1094 #if HAVE_SETPGID
1095         /*
1096          * If we're interactive we want to set our own process group for
1097          * signal management.
1098          */
1099         if (interactive && !no_process_group)
1100                 setpgid( (pid_t)0, (pid_t)0);
1101 #endif
1102
1103         if (!directory_exist(lp_lockdir()))
1104                 mkdir(lp_lockdir(), 0755);
1105
1106         if (is_daemon)
1107                 pidfile_create("smbd");
1108
1109         status = reinit_after_fork(smbd_messaging_context(),
1110                                    smbd_event_context(),
1111                                    procid_self(), false);
1112         if (!NT_STATUS_IS_OK(status)) {
1113                 DEBUG(0,("reinit_after_fork() failed\n"));
1114                 exit(1);
1115         }
1116
1117         smbd_server_conn->msg_ctx = smbd_messaging_context();
1118
1119         smbd_setup_sig_term_handler();
1120         smbd_setup_sig_hup_handler(smbd_event_context(),
1121                                    smbd_server_conn->msg_ctx);
1122
1123         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1124
1125         if (smbd_memcache() == NULL) {
1126                 exit(1);
1127         }
1128
1129         memcache_set_global(smbd_memcache());
1130
1131         /* Initialise the password backed before the global_sam_sid
1132            to ensure that we fetch from ldap before we make a domain sid up */
1133
1134         if(!initialize_password_db(False, smbd_event_context()))
1135                 exit(1);
1136
1137         if (!secrets_init()) {
1138                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1139                 exit(1);
1140         }
1141
1142         if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC) {
1143                 if (!open_schannel_session_store(NULL, lp_private_dir())) {
1144                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
1145                         exit(1);
1146                 }
1147         }
1148
1149         if(!get_global_sam_sid()) {
1150                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1151                 exit(1);
1152         }
1153
1154         if (!sessionid_init()) {
1155                 exit(1);
1156         }
1157
1158         if (!connections_init(True))
1159                 exit(1);
1160
1161         if (!locking_init())
1162                 exit(1);
1163
1164         if (!messaging_tdb_parent_init(smbd_event_context())) {
1165                 exit(1);
1166         }
1167
1168         if (!notify_internal_parent_init(smbd_event_context())) {
1169                 exit(1);
1170         }
1171
1172         if (!serverid_parent_init(smbd_event_context())) {
1173                 exit(1);
1174         }
1175
1176         if (!printer_list_parent_init()) {
1177                 exit(1);
1178         }
1179
1180         if (!W_ERROR_IS_OK(registry_init_full()))
1181                 exit(1);
1182
1183         /* Open the share_info.tdb here, so we don't have to open
1184            after the fork on every single connection.  This is a small
1185            performance improvment and reduces the total number of system
1186            fds used. */
1187         if (!share_info_db_init()) {
1188                 DEBUG(0,("ERROR: failed to load share info db.\n"));
1189                 exit(1);
1190         }
1191
1192         status = init_system_info();
1193         if (!NT_STATUS_IS_OK(status)) {
1194                 DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
1195                           nt_errstr(status)));
1196                 return -1;
1197         }
1198
1199         if (!init_guest_info()) {
1200                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1201                 return -1;
1202         }
1203
1204         if (!file_init(smbd_server_conn)) {
1205                 DEBUG(0, ("ERROR: file_init failed\n"));
1206                 return -1;
1207         }
1208
1209         if (is_daemon && !interactive) {
1210                 const char *rpcsrv_type;
1211
1212                 rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
1213                                                    "rpc_server", "epmapper",
1214                                                    "none");
1215                 if (StrCaseCmp(rpcsrv_type, "daemon") == 0) {
1216                         start_epmd(smbd_event_context(),
1217                                    smbd_server_conn->msg_ctx);
1218                 }
1219         }
1220
1221         if (!dcesrv_ep_setup(smbd_event_context(), smbd_server_conn->msg_ctx)) {
1222                 exit(1);
1223         }
1224
1225         /*
1226          * The print backend init also migrates the printing tdb's,
1227          * this requires a winreg pipe.
1228          */
1229         if (!print_backend_init(smbd_messaging_context()))
1230                 exit(1);
1231
1232         /* only start the background queue daemon if we are
1233            running as a daemon -- bad things will happen if
1234            smbd is launched via inetd and we fork a copy of
1235            ourselves here */
1236
1237         if (is_daemon && !interactive
1238             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1239                 /* background queue is responsible for printcap cache updates */
1240                 messaging_register(smbd_server_conn->msg_ctx,
1241                                    smbd_event_context(),
1242                                    MSG_PRINTER_PCAP, smb_pcap_updated);
1243                 start_background_queue(server_event_context(),
1244                                        smbd_server_conn->msg_ctx);
1245         } else {
1246                 DEBUG(3, ("running without background printer process, dynamic "
1247                           "printer updates disabled\n"));
1248                 /* Publish nt printers, this requires a working winreg pipe */
1249                 pcap_cache_reload(server_event_context(),
1250                                   smbd_messaging_context(),
1251                                   &reload_printers);
1252         }
1253
1254         if (is_daemon && !_lp_disable_spoolss()) {
1255                 const char *rpcsrv_type;
1256
1257                 /* start spoolss daemon */
1258                 /* start as a separate daemon only if enabled */
1259                 rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
1260                                                    "rpc_server", "spoolss",
1261                                                    "embedded");
1262                 if (StrCaseCmp(rpcsrv_type, "daemon") == 0) {
1263                         start_spoolssd(smbd_event_context(),
1264                                        smbd_messaging_context());
1265                 }
1266         }
1267
1268         if (!is_daemon) {
1269                 /* inetd mode */
1270                 TALLOC_FREE(frame);
1271
1272                 /* Started from inetd. fd 0 is the socket. */
1273                 /* We will abort gracefully when the client or remote system
1274                    goes away */
1275                 smbd_set_server_fd(dup(0));
1276
1277                 /* close our standard file descriptors */
1278                 close_low_fds(False); /* Don't close stderr */
1279
1280 #ifdef HAVE_ATEXIT
1281                 atexit(killkids);
1282 #endif
1283
1284                 /* Stop zombies */
1285                 smbd_setup_sig_chld_handler();
1286
1287                 smbd_process(smbd_server_conn);
1288
1289                 exit_server_cleanly(NULL);
1290                 return(0);
1291         }
1292
1293         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1294         if (!parent) {
1295                 exit_server("talloc(struct smbd_parent_context) failed");
1296         }
1297         parent->interactive = interactive;
1298
1299         if (!open_sockets_smbd(parent, smbd_messaging_context(), ports))
1300                 exit_server("open_sockets_smbd() failed");
1301
1302         TALLOC_FREE(frame);
1303         /* make sure we always have a valid stackframe */
1304         frame = talloc_stackframe();
1305
1306         smbd_parent_loop(parent);
1307
1308         exit_server_cleanly(NULL);
1309         TALLOC_FREE(frame);
1310         return(0);
1311 }