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