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 "popt_common.h"
  26 #include "smbd/globals.h"
  27 #include "librpc/gen_ndr/messaging.h"
  28 #include "registry.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/srv_rpc_register.h"
  36
  37 #ifdef WITH_DFS
  38 extern int dcelogin_atmost_once;
  39 #endif /* WITH_DFS */
  40
  41 static void smbd_set_server_fd(int fd)
  42 {
  43         struct smbd_server_connection *sconn = smbd_server_conn;
  44         char addr[INET6_ADDRSTRLEN];
  45         const char *name;
  46
  47         sconn->sock = fd;
  48
  49         /*
  50          * Initialize sconn->client_id: If we can't find the client's
  51          * name, default to its address.
  52          */
  53
  54         client_addr(fd, sconn->client_id.addr, sizeof(sconn->client_id.addr));
  55
  56         name = client_name(sconn->sock);
  57         if (strcmp(name, "UNKNOWN") != 0) {
  58                 name = talloc_strdup(sconn, name);
  59         } else {
  60                 name = NULL;
  61         }
  62         sconn->client_id.name =
  63                 (name != NULL) ? name : sconn->client_id.addr;
  64
  65         sub_set_socket_ids(sconn->client_id.addr, sconn->client_id.name,
  66                            client_socket_addr(sconn->sock, addr,
  67                                               sizeof(addr)));
  68 }
  69
  70 struct event_context *smbd_event_context(void)
  71 {
  72         return server_event_context();
  73 }
  74
  75 /*******************************************************************
  76  What to do when smb.conf is updated.
  77  ********************************************************************/
  78
  79 static void smb_conf_updated(struct messaging_context *msg,
  80                              void *private_data,
  81                              uint32_t msg_type,
  82                              struct server_id server_id,
  83                              DATA_BLOB *data)
  84 {
  85         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
  86                   "updated. Reloading.\n"));
  87         change_to_root_user();
  88         reload_services(msg, smbd_server_conn->sock, False);
  89         if (am_parent) {
  90                 pcap_cache_reload(server_event_context(), msg,
  91                                   &reload_pcap_change_notify);
  92         }
  93 }
  94
  95 /*******************************************************************
  96  What to do when printcap is updated.
  97  ********************************************************************/
  98
  99 static void smb_pcap_updated(struct messaging_context *msg,
 100                              void *private_data,
 101                              uint32_t msg_type,
 102                              struct server_id server_id,
 103                              DATA_BLOB *data)
 104 {
 105         DEBUG(10,("Got message saying pcap was updated. Reloading.\n"));
 106         change_to_root_user();
 107         reload_printers(server_event_context(), msg);
 108 }
 109
 110 /*******************************************************************
 111  Delete a statcache entry.
 112  ********************************************************************/
 113
 114 static void smb_stat_cache_delete(struct messaging_context *msg,
 115                                   void *private_data,
 116                                   uint32_t msg_tnype,
 117                                   struct server_id server_id,
 118                                   DATA_BLOB *data)
 119 {
 120         const char *name = (const char *)data->data;
 121         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 122         stat_cache_delete(name);
 123 }
 124
 125 /****************************************************************************
 126   Send a SIGTERM to our process group.
 127 *****************************************************************************/
 128
 129 static void  killkids(void)
 130 {
 131         if(am_parent) kill(0,SIGTERM);
 132 }
 133
 134 /****************************************************************************
 135  Process a sam sync message - not sure whether to do this here or
 136  somewhere else.
 137 ****************************************************************************/
 138
 139 static void msg_sam_sync(struct messaging_context *msg,
 140                          void *private_data,
 141                          uint32_t msg_type,
 142                          struct server_id server_id,
 143                          DATA_BLOB *data)
 144 {
 145         DEBUG(10, ("** sam sync message received, ignoring\n"));
 146 }
 147
 148 static void msg_exit_server(struct messaging_context *msg,
 149                             void *private_data,
 150                             uint32_t msg_type,
 151                             struct server_id server_id,
 152                             DATA_BLOB *data)
 153 {
 154         DEBUG(3, ("got a SHUTDOWN message\n"));
 155         exit_server_cleanly(NULL);
 156 }
 157
 158 #ifdef DEVELOPER
 159 static void msg_inject_fault(struct messaging_context *msg,
 160                              void *private_data,
 161                              uint32_t msg_type,
 162                              struct server_id src,
 163                              DATA_BLOB *data)
 164 {
 165         int sig;
 166
 167         if (data->length != sizeof(sig)) {
 168                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 169                           procid_str_static(&src)));
 170                 return;
 171         }
 172
 173         sig = *(int *)data->data;
 174         if (sig == -1) {
 175                 exit_server("internal error injected");
 176                 return;
 177         }
 178
 179 #if HAVE_STRSIGNAL
 180         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 181                   procid_str_static(&src), sig, strsignal(sig)));
 182 #else
 183         DEBUG(0, ("Process %s requested injection of signal %d\n",
 184                   procid_str_static(&src), sig));
 185 #endif
 186
 187         kill(sys_getpid(), sig);
 188 }
 189 #endif /* DEVELOPER */
 190
 191 /*
 192  * Parent smbd process sets its own debug level first and then
 193  * sends a message to all the smbd children to adjust their debug
 194  * level to that of the parent.
 195  */
 196
 197 static void smbd_msg_debug(struct messaging_context *msg_ctx,
 198                            void *private_data,
 199                            uint32_t msg_type,
 200                            struct server_id server_id,
 201                            DATA_BLOB *data)
 202 {
 203         struct child_pid *child;
 204
 205         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 206
 207         for (child = children; child != NULL; child = child->next) {
 208                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 209                                    MSG_DEBUG,
 210                                    data->data,
 211                                    strlen((char *) data->data) + 1);
 212         }
 213 }
 214
 215 static void add_child_pid(pid_t pid)
 216 {
 217         struct child_pid *child;
 218
 219         child = SMB_MALLOC_P(struct child_pid);
 220         if (child == NULL) {
 221                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 222                 return;
 223         }
 224         child->pid = pid;
 225         DLIST_ADD(children, child);
 226         num_children += 1;
 227 }
 228
 229 /*
 230   at most every smbd:cleanuptime seconds (default 20), we scan the BRL
 231   and locking database for entries to cleanup. As a side effect this
 232   also cleans up dead entries in the connections database (due to the
 233   traversal in message_send_all()
 234
 235   Using a timer for this prevents a flood of traversals when a large
 236   number of clients disconnect at the same time (perhaps due to a
 237   network outage).
 238 */
 239
 240 static void cleanup_timeout_fn(struct event_context *event_ctx,
 241                                 struct timed_event *te,
 242                                 struct timeval now,
 243                                 void *private_data)
 244 {
 245         struct timed_event **cleanup_te = (struct timed_event **)private_data;
 246
 247         DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
 248         message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
 249         messaging_send_buf(smbd_messaging_context(), procid_self(),
 250                                 MSG_SMB_BRL_VALIDATE, NULL, 0);
 251         /* mark the cleanup as having been done */
 252         (*cleanup_te) = NULL;
 253 }
 254
 255 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 256 {
 257         struct child_pid *child;
 258         static struct timed_event *cleanup_te;
 259         struct server_id child_id;
 260
 261         if (unclean_shutdown) {
 262                 /* a child terminated uncleanly so tickle all
 263                    processes to see if they can grab any of the
 264                    pending locks
 265                 */
 266                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
 267                         (unsigned int)pid));
 268                 if (!cleanup_te) {
 269                         /* call the cleanup timer, but not too often */
 270                         int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
 271                         cleanup_te = event_add_timed(smbd_event_context(), NULL,
 272                                                 timeval_current_ofs(cleanup_time, 0),
 273                                                 cleanup_timeout_fn,
 274                                                 &cleanup_te);
 275                         DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
 276                 }
 277         }
 278
 279         child_id = procid_self(); /* Just initialize pid and potentially vnn */
 280         child_id.pid = pid;
 281
 282         if (!serverid_deregister(child_id)) {
 283                 DEBUG(1, ("Could not remove pid %d from serverid.tdb\n",
 284                           (int)pid));
 285         }
 286
 287         for (child = children; child != NULL; child = child->next) {
 288                 if (child->pid == pid) {
 289                         struct child_pid *tmp = child;
 290                         DLIST_REMOVE(children, child);
 291                         SAFE_FREE(tmp);
 292                         num_children -= 1;
 293                         return;
 294                 }
 295         }
 296
 297         /* not all forked child processes are added to the children list */
 298         DEBUG(1, ("Could not find child %d -- ignoring\n", (int)pid));
 299 }
 300
 301 /****************************************************************************
 302  Have we reached the process limit ?
 303 ****************************************************************************/
 304
 305 static bool allowable_number_of_smbd_processes(void)
 306 {
 307         int max_processes = lp_max_smbd_processes();
 308
 309         if (!max_processes)
 310                 return True;
 311
 312         return num_children < max_processes;
 313 }
 314
 315 static void smbd_sig_chld_handler(struct tevent_context *ev,
 316                                   struct tevent_signal *se,
 317                                   int signum,
 318                                   int count,
 319                                   void *siginfo,
 320                                   void *private_data)
 321 {
 322         pid_t pid;
 323         int status;
 324
 325         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 326                 bool unclean_shutdown = False;
 327
 328                 /* If the child terminated normally, assume
 329                    it was an unclean shutdown unless the
 330                    status is 0
 331                 */
 332                 if (WIFEXITED(status)) {
 333                         unclean_shutdown = WEXITSTATUS(status);
 334                 }
 335                 /* If the child terminated due to a signal
 336                    we always assume it was unclean.
 337                 */
 338                 if (WIFSIGNALED(status)) {
 339                         unclean_shutdown = True;
 340                 }
 341                 remove_child_pid(pid, unclean_shutdown);
 342         }
 343 }
 344
 345 static void smbd_setup_sig_chld_handler(void)
 346 {
 347         struct tevent_signal *se;
 348
 349         se = tevent_add_signal(smbd_event_context(),
 350                                smbd_event_context(),
 351                                SIGCHLD, 0,
 352                                smbd_sig_chld_handler,
 353                                NULL);
 354         if (!se) {
 355                 exit_server("failed to setup SIGCHLD handler");
 356         }
 357 }
 358
 359 struct smbd_open_socket;
 360
 361 struct smbd_parent_context {
 362         bool interactive;
 363
 364         /* the list of listening sockets */
 365         struct smbd_open_socket *sockets;
 366 };
 367
 368 struct smbd_open_socket {
 369         struct smbd_open_socket *prev, *next;
 370         struct smbd_parent_context *parent;
 371         int fd;
 372         struct tevent_fd *fde;
 373 };
 374
 375 static void smbd_open_socket_close_fn(struct tevent_context *ev,
 376                                       struct tevent_fd *fde,
 377                                       int fd,
 378                                       void *private_data)
 379 {
 380         /* this might be the socket_wrapper swrap_close() */
 381         close(fd);
 382 }
 383
 384 static void smbd_accept_connection(struct tevent_context *ev,
 385                                    struct tevent_fd *fde,
 386                                    uint16_t flags,
 387                                    void *private_data)
 388 {
 389         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
 390                                      struct smbd_open_socket);
 391         struct sockaddr_storage addr;
 392         socklen_t in_addrlen = sizeof(addr);
 393         int fd;
 394         pid_t pid = 0;
 395         uint64_t unique_id;
 396
 397         fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
 398         smbd_set_server_fd(fd);
 399
 400         if (fd == -1 && errno == EINTR)
 401                 return;
 402
 403         if (fd == -1) {
 404                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 405                          strerror(errno)));
 406                 return;
 407         }
 408
 409         if (s->parent->interactive) {
 410                 smbd_process(smbd_server_conn);
 411                 exit_server_cleanly("end of interactive mode");
 412                 return;
 413         }
 414
 415         if (!allowable_number_of_smbd_processes()) {
 416                 close(fd);
 417                 smbd_set_server_fd(-1);
 418                 return;
 419         }
 420
 421         /*
 422          * Generate a unique id in the parent process so that we use
 423          * the global random state in the parent.
 424          */
 425         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
 426
 427         pid = sys_fork();
 428         if (pid == 0) {
 429                 NTSTATUS status = NT_STATUS_OK;
 430
 431                 /* Child code ... */
 432                 am_parent = 0;
 433
 434                 set_my_unique_id(unique_id);
 435
 436                 /* Stop zombies, the parent explicitly handles
 437                  * them, counting worker smbds. */
 438                 CatchChild();
 439
 440                 /* close our standard file
 441                    descriptors */
 442                 close_low_fds(False);
 443
 444                 /*
 445                  * Can't use TALLOC_FREE here. Nulling out the argument to it
 446                  * would overwrite memory we've just freed.
 447                  */
 448                 talloc_free(s->parent);
 449                 s = NULL;
 450
 451                 status = reinit_after_fork(smbd_messaging_context(),
 452                                            smbd_event_context(), procid_self(),
 453                                            true);
 454                 if (!NT_STATUS_IS_OK(status)) {
 455                         if (NT_STATUS_EQUAL(status,
 456                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
 457                                 DEBUG(0,("child process cannot initialize "
 458                                          "because too many files are open\n"));
 459                                 goto exit;
 460                         }
 461                         DEBUG(0,("reinit_after_fork() failed\n"));
 462                         smb_panic("reinit_after_fork() failed");
 463                 }
 464
 465                 smbd_setup_sig_term_handler();
 466                 smbd_setup_sig_hup_handler(server_event_context(),
 467                                            server_messaging_context());
 468
 469                 if (!serverid_register(procid_self(),
 470                                        FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 471                                        |FLAG_MSG_DBWRAP
 472                                        |FLAG_MSG_PRINT_GENERAL)) {
 473                         exit_server_cleanly("Could not register myself in "
 474                                             "serverid.tdb");
 475                 }
 476
 477                 smbd_process(smbd_server_conn);
 478          exit:
 479                 exit_server_cleanly("end of child");
 480                 return;
 481         }
 482
 483         if (pid < 0) {
 484                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
 485                          strerror(errno)));
 486         }
 487
 488         /* The parent doesn't need this socket */
 489         close(fd);
 490
 491         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 492                 Clear the closed fd info out of server_fd --
 493                 and more importantly, out of client_fd in
 494                 util_sock.c, to avoid a possible
 495                 getpeername failure if we reopen the logs
 496                 and use %I in the filename.
 497         */
 498
 499         smbd_set_server_fd(-1);
 500
 501         if (pid != 0) {
 502                 add_child_pid(pid);
 503         }
 504
 505         /* Force parent to check log size after
 506          * spawning child.  Fix from
 507          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 508          * parent smbd will log to logserver.smb.  It
 509          * writes only two messages for each child
 510          * started/finished. But each child writes,
 511          * say, 50 messages also in logserver.smb,
 512          * begining with the debug_count of the
 513          * parent, before the child opens its own log
 514          * file logserver.client. In a worst case
 515          * scenario the size of logserver.smb would be
 516          * checked after about 50*50=2500 messages
 517          * (ca. 100kb).
 518          * */
 519         force_check_log_size();
 520 }
 521
 522 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
 523                                  const struct sockaddr_storage *ifss,
 524                                  uint16_t port)
 525 {
 526         struct smbd_open_socket *s;
 527
 528         s = talloc(parent, struct smbd_open_socket);
 529         if (!s) {
 530                 return false;
 531         }
 532
 533         s->parent = parent;
 534         s->fd = open_socket_in(SOCK_STREAM,
 535                                port,
 536                                parent->sockets == NULL ? 0 : 2,
 537                                ifss,
 538                                true);
 539         if (s->fd == -1) {
 540                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
 541                         "%s\n", strerror(errno)));
 542                 TALLOC_FREE(s);
 543                 /*
 544                  * We ignore an error here, as we've done before
 545                  */
 546                 return true;
 547         }
 548
 549         /* ready to listen */
 550         set_socket_options(s->fd, "SO_KEEPALIVE");
 551         set_socket_options(s->fd, lp_socket_options());
 552
 553         /* Set server socket to
 554          * non-blocking for the accept. */
 555         set_blocking(s->fd, False);
 556
 557         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
 558                 DEBUG(0,("open_sockets_smbd: listen: "
 559                         "%s\n", strerror(errno)));
 560                         close(s->fd);
 561                 TALLOC_FREE(s);
 562                 return false;
 563         }
 564
 565         s->fde = tevent_add_fd(smbd_event_context(),
 566                                s,
 567                                s->fd, TEVENT_FD_READ,
 568                                smbd_accept_connection,
 569                                s);
 570         if (!s->fde) {
 571                 DEBUG(0,("open_sockets_smbd: "
 572                          "tevent_add_fd: %s\n",
 573                          strerror(errno)));
 574                 close(s->fd);
 575                 TALLOC_FREE(s);
 576                 return false;
 577         }
 578         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
 579
 580         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
 581
 582         return true;
 583 }
 584
 585 static bool smbd_parent_housekeeping(const struct timeval *now, void *private_data)
 586 {
 587         time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
 588         time_t t = time_mono(NULL);
 589
 590         DEBUG(5, ("parent housekeeping\n"));
 591
 592         /* if periodic printcap rescan is enabled, see if it's time to reload */
 593         if ((printcap_cache_time != 0)
 594          && (t >= (last_printer_reload_time + printcap_cache_time))) {
 595                 DEBUG( 3,( "Printcap cache time expired.\n"));
 596                 pcap_cache_reload(server_event_context(),
 597                                   smbd_messaging_context(),
 598                                   &reload_pcap_change_notify);
 599                 last_printer_reload_time = t;
 600         }
 601
 602         return true;
 603 }
 604
 605 /****************************************************************************
 606  Open the socket communication.
 607 ****************************************************************************/
 608
 609 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 610                               struct messaging_context *msg_ctx,
 611                               const char *smb_ports)
 612 {
 613         int num_interfaces = iface_count();
 614         int i;
 615         char *ports;
 616         unsigned dns_port = 0;
 617
 618 #ifdef HAVE_ATEXIT
 619         atexit(killkids);
 620 #endif
 621
 622         /* Stop zombies */
 623         smbd_setup_sig_chld_handler();
 624
 625         /* use a reasonable default set of ports - listing on 445 and 139 */
 626         if (!smb_ports) {
 627                 ports = lp_smb_ports();
 628                 if (!ports || !*ports) {
 629                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 630                 } else {
 631                         ports = talloc_strdup(talloc_tos(), ports);
 632                 }
 633         } else {
 634                 ports = talloc_strdup(talloc_tos(), smb_ports);
 635         }
 636
 637         if (lp_interfaces() && lp_bind_interfaces_only()) {
 638                 /* We have been given an interfaces line, and been
 639                    told to only bind to those interfaces. Create a
 640                    socket per interface and bind to only these.
 641                 */
 642
 643                 /* Now open a listen socket for each of the
 644                    interfaces. */
 645                 for(i = 0; i < num_interfaces; i++) {
 646                         const struct sockaddr_storage *ifss =
 647                                         iface_n_sockaddr_storage(i);
 648                         char *tok;
 649                         const char *ptr;
 650
 651                         if (ifss == NULL) {
 652                                 DEBUG(0,("open_sockets_smbd: "
 653                                         "interface %d has NULL IP address !\n",
 654                                         i));
 655                                 continue;
 656                         }
 657
 658                         for (ptr=ports;
 659                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 660                                 unsigned port = atoi(tok);
 661                                 if (port == 0 || port > 0xffff) {
 662                                         continue;
 663                                 }
 664
 665                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 666                                         return false;
 667                                 }
 668                         }
 669                 }
 670         } else {
 671                 /* Just bind to 0.0.0.0 - accept connections
 672                    from anywhere. */
 673
 674                 char *tok;
 675                 const char *ptr;
 676                 const char *sock_addr = lp_socket_address();
 677                 char *sock_tok;
 678                 const char *sock_ptr;
 679
 680                 if (strequal(sock_addr, "0.0.0.0") ||
 681                     strequal(sock_addr, "::")) {
 682 #if HAVE_IPV6
 683                         sock_addr = "::,0.0.0.0";
 684 #else
 685                         sock_addr = "0.0.0.0";
 686 #endif
 687                 }
 688
 689                 for (sock_ptr=sock_addr;
 690                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 691                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 692                                 struct sockaddr_storage ss;
 693
 694                                 unsigned port = atoi(tok);
 695                                 if (port == 0 || port > 0xffff) {
 696                                         continue;
 697                                 }
 698
 699                                 /* Keep the first port for mDNS service
 700                                  * registration.
 701                                  */
 702                                 if (dns_port == 0) {
 703                                         dns_port = port;
 704                                 }
 705
 706                                 /* open an incoming socket */
 707                                 if (!interpret_string_addr(&ss, sock_tok,
 708                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 709                                         continue;
 710                                 }
 711
 712                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 713                                         return false;
 714                                 }
 715                         }
 716                 }
 717         }
 718
 719         if (parent->sockets == NULL) {
 720                 DEBUG(0,("open_sockets_smbd: No "
 721                         "sockets available to bind to.\n"));
 722                 return false;
 723         }
 724
 725         /* Setup the main smbd so that we can get messages. Note that
 726            do this after starting listening. This is needed as when in
 727            clustered mode, ctdb won't allow us to start doing database
 728            operations until it has gone thru a full startup, which
 729            includes checking to see that smbd is listening. */
 730
 731         if (!serverid_register(procid_self(),
 732                                FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 733                                |FLAG_MSG_DBWRAP)) {
 734                 DEBUG(0, ("open_sockets_smbd: Failed to register "
 735                           "myself in serverid.tdb\n"));
 736                 return false;
 737         }
 738
 739         if (!(event_add_idle(smbd_event_context(), NULL,
 740                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
 741                              "parent_housekeeping", smbd_parent_housekeeping,
 742                              NULL))) {
 743                 DEBUG(0, ("Could not add parent_housekeeping event\n"));
 744                 return false;
 745         }
 746
 747         /* Listen to messages */
 748
 749         messaging_register(msg_ctx, NULL, MSG_SMB_SAM_SYNC, msg_sam_sync);
 750         messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
 751         messaging_register(msg_ctx, NULL, MSG_SMB_FILE_RENAME,
 752                            msg_file_was_renamed);
 753         messaging_register(msg_ctx, NULL, MSG_SMB_CONF_UPDATED,
 754                            smb_conf_updated);
 755         messaging_register(msg_ctx, NULL, MSG_SMB_STAT_CACHE_DELETE,
 756                            smb_stat_cache_delete);
 757         messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
 758         messaging_register(msg_ctx, NULL, MSG_PRINTER_PCAP, smb_pcap_updated);
 759         brl_register_msgs(msg_ctx);
 760
 761 #ifdef CLUSTER_SUPPORT
 762         if (lp_clustering()) {
 763                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 764         }
 765 #endif
 766
 767 #ifdef DEVELOPER
 768         messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
 769                            msg_inject_fault);
 770 #endif
 771
 772         if (lp_multicast_dns_register() && (dns_port != 0)) {
 773 #ifdef WITH_DNSSD_SUPPORT
 774                 smbd_setup_mdns_registration(smbd_event_context(),
 775                                              parent, dns_port);
 776 #endif
 777 #ifdef WITH_AVAHI_SUPPORT
 778                 void *avahi_conn;
 779
 780                 avahi_conn = avahi_start_register(
 781                         smbd_event_context(), smbd_event_context(), dns_port);
 782                 if (avahi_conn == NULL) {
 783                         DEBUG(10, ("avahi_start_register failed\n"));
 784                 }
 785 #endif
 786         }
 787
 788         return true;
 789 }
 790
 791 static void smbd_parent_loop(struct smbd_parent_context *parent)
 792 {
 793         /* now accept incoming connections - forking a new process
 794            for each incoming connection */
 795         DEBUG(2,("waiting for connections\n"));
 796         while (1) {
 797                 int ret;
 798                 TALLOC_CTX *frame = talloc_stackframe();
 799
 800                 ret = tevent_loop_once(smbd_event_context());
 801                 if (ret != 0) {
 802                         exit_server_cleanly("tevent_loop_once() error");
 803                 }
 804
 805                 TALLOC_FREE(frame);
 806         } /* end while 1 */
 807
 808 /* NOTREACHED   return True; */
 809 }
 810
 811
 812 /****************************************************************************
 813  Initialise connect, service and file structs.
 814 ****************************************************************************/
 815
 816 static bool init_structs(void )
 817 {
 818         /*
 819          * Set the machine NETBIOS name if not already
 820          * set from the config file.
 821          */
 822
 823         if (!init_names())
 824                 return False;
 825
 826         if (!secrets_init())
 827                 return False;
 828
 829         return True;
 830 }
 831
 832 /****************************************************************************
 833  main program.
 834 ****************************************************************************/
 835
 836 /* Declare prototype for build_options() to avoid having to run it through
 837    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 838    prototype generation system is too complicated. */
 839
 840 extern void build_options(bool screen);
 841
 842  int main(int argc,const char *argv[])
 843 {
 844         /* shall I run as a daemon */
 845         bool is_daemon = false;
 846         bool interactive = false;
 847         bool Fork = true;
 848         bool no_process_group = false;
 849         bool log_stdout = false;
 850         char *ports = NULL;
 851         char *profile_level = NULL;
 852         int opt;
 853         poptContext pc;
 854         bool print_build_options = False;
 855         enum {
 856                 OPT_DAEMON = 1000,
 857                 OPT_INTERACTIVE,
 858                 OPT_FORK,
 859                 OPT_NO_PROCESS_GROUP,
 860                 OPT_LOG_STDOUT
 861         };
 862         struct poptOption long_options[] = {
 863         POPT_AUTOHELP
 864         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 865         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 866         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 867         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 868         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 869         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 870         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 871         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 872         POPT_COMMON_SAMBA
 873         POPT_COMMON_DYNCONFIG
 874         POPT_TABLEEND
 875         };
 876         struct smbd_parent_context *parent = NULL;
 877         TALLOC_CTX *frame;
 878         NTSTATUS status;
 879         uint64_t unique_id;
 880
 881         /*
 882          * Do this before any other talloc operation
 883          */
 884         talloc_enable_null_tracking();
 885         frame = talloc_stackframe();
 886
 887         load_case_tables();
 888
 889         /* Initialize the event context, it will panic on error */
 890         smbd_event_context();
 891
 892         smbd_init_globals();
 893
 894         TimeInit();
 895
 896 #ifdef HAVE_SET_AUTH_PARAMETERS
 897         set_auth_parameters(argc,argv);
 898 #endif
 899
 900         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 901         while((opt = poptGetNextOpt(pc)) != -1) {
 902                 switch (opt)  {
 903                 case OPT_DAEMON:
 904                         is_daemon = true;
 905                         break;
 906                 case OPT_INTERACTIVE:
 907                         interactive = true;
 908                         break;
 909                 case OPT_FORK:
 910                         Fork = false;
 911                         break;
 912                 case OPT_NO_PROCESS_GROUP:
 913                         no_process_group = true;
 914                         break;
 915                 case OPT_LOG_STDOUT:
 916                         log_stdout = true;
 917                         break;
 918                 case 'b':
 919                         print_build_options = True;
 920                         break;
 921                 default:
 922                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 923                                   poptBadOption(pc, 0), poptStrerror(opt));
 924                         poptPrintUsage(pc, stderr, 0);
 925                         exit(1);
 926                 }
 927         }
 928         poptFreeContext(pc);
 929
 930         if (interactive) {
 931                 Fork = False;
 932                 log_stdout = True;
 933         }
 934
 935         if (log_stdout) {
 936                 setup_logging(argv[0], DEBUG_STDOUT);
 937         } else {
 938                 setup_logging(argv[0], DEBUG_FILE);
 939         }
 940
 941         if (print_build_options) {
 942                 build_options(True); /* Display output to screen as well as debug */
 943                 exit(0);
 944         }
 945
 946 #ifdef HAVE_SETLUID
 947         /* needed for SecureWare on SCO */
 948         setluid(0);
 949 #endif
 950
 951         set_remote_machine_name("smbd", False);
 952
 953         if (interactive && (DEBUGLEVEL >= 9)) {
 954                 talloc_enable_leak_report();
 955         }
 956
 957         if (log_stdout && Fork) {
 958                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 959                 exit(1);
 960         }
 961
 962         /* we want to re-seed early to prevent time delays causing
 963            client problems at a later date. (tridge) */
 964         generate_random_buffer(NULL, 0);
 965
 966         /* get initial effective uid and gid */
 967         sec_init();
 968
 969         /* make absolutely sure we run as root - to handle cases where people
 970            are crazy enough to have it setuid */
 971         gain_root_privilege();
 972         gain_root_group_privilege();
 973
 974         fault_setup((void (*)(void *))exit_server_fault);
 975         dump_core_setup("smbd");
 976
 977         /* we are never interested in SIGPIPE */
 978         BlockSignals(True,SIGPIPE);
 979
 980 #if defined(SIGFPE)
 981         /* we are never interested in SIGFPE */
 982         BlockSignals(True,SIGFPE);
 983 #endif
 984
 985 #if defined(SIGUSR2)
 986         /* We are no longer interested in USR2 */
 987         BlockSignals(True,SIGUSR2);
 988 #endif
 989
 990         /* POSIX demands that signals are inherited. If the invoking process has
 991          * these signals masked, we will have problems, as we won't recieve them. */
 992         BlockSignals(False, SIGHUP);
 993         BlockSignals(False, SIGUSR1);
 994         BlockSignals(False, SIGTERM);
 995
 996         /* Ensure we leave no zombies until we
 997          * correctly set up child handling below. */
 998
 999         CatchChild();
1000
1001         /* we want total control over the permissions on created files,
1002            so set our umask to 0 */
1003         umask(0);
1004
1005         reopen_logs();
1006
1007         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1008         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1009
1010         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1011                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1012
1013         /* Output the build options to the debug log */
1014         build_options(False);
1015
1016         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1017                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1018                 exit(1);
1019         }
1020
1021         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1022                 DEBUG(0, ("error opening config file\n"));
1023                 exit(1);
1024         }
1025
1026         /* Init the security context and global current_user */
1027         init_sec_ctx();
1028
1029         if (smbd_messaging_context() == NULL)
1030                 exit(1);
1031
1032         /*
1033          * Reloading of the printers will not work here as we don't have a
1034          * server info and rpc services set up. It will be called later.
1035          */
1036         if (!reload_services(smbd_messaging_context(), -1, False)) {
1037                 exit(1);
1038         }
1039
1040         /* ...NOTE... Log files are working from this point! */
1041
1042         DEBUG(3,("loaded services\n"));
1043
1044         init_structs();
1045
1046 #ifdef WITH_PROFILE
1047         if (!profile_setup(smbd_messaging_context(), False)) {
1048                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1049                 return -1;
1050         }
1051         if (profile_level != NULL) {
1052                 int pl = atoi(profile_level);
1053                 struct server_id src;
1054
1055                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1056                 src.pid = getpid();
1057                 set_profile_level(pl, src);
1058         }
1059 #endif
1060
1061         if (!is_daemon && !is_a_socket(0)) {
1062                 if (!interactive)
1063                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1064
1065                 /*
1066                  * Setting is_daemon here prevents us from eventually calling
1067                  * the open_sockets_inetd()
1068                  */
1069
1070                 is_daemon = True;
1071         }
1072
1073         if (is_daemon && !interactive) {
1074                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1075                 become_daemon(Fork, no_process_group, log_stdout);
1076         }
1077
1078         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
1079         set_my_unique_id(unique_id);
1080
1081 #if HAVE_SETPGID
1082         /*
1083          * If we're interactive we want to set our own process group for
1084          * signal management.
1085          */
1086         if (interactive && !no_process_group)
1087                 setpgid( (pid_t)0, (pid_t)0);
1088 #endif
1089
1090         if (!directory_exist(lp_lockdir()))
1091                 mkdir(lp_lockdir(), 0755);
1092
1093         if (is_daemon)
1094                 pidfile_create("smbd");
1095
1096         status = reinit_after_fork(smbd_messaging_context(),
1097                                    smbd_event_context(),
1098                                    procid_self(), false);
1099         if (!NT_STATUS_IS_OK(status)) {
1100                 DEBUG(0,("reinit_after_fork() failed\n"));
1101                 exit(1);
1102         }
1103
1104         smbd_server_conn->msg_ctx = smbd_messaging_context();
1105
1106         smbd_setup_sig_term_handler();
1107         smbd_setup_sig_hup_handler(smbd_event_context(),
1108                                    smbd_server_conn->msg_ctx);
1109
1110         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1111
1112         if (smbd_memcache() == NULL) {
1113                 exit(1);
1114         }
1115
1116         memcache_set_global(smbd_memcache());
1117
1118         /* Initialise the password backed before the global_sam_sid
1119            to ensure that we fetch from ldap before we make a domain sid up */
1120
1121         if(!initialize_password_db(False, smbd_event_context()))
1122                 exit(1);
1123
1124         if (!secrets_init()) {
1125                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1126                 exit(1);
1127         }
1128
1129         if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC) {
1130                 if (!open_schannel_session_store(NULL, lp_private_dir())) {
1131                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
1132                         exit(1);
1133                 }
1134         }
1135
1136         if(!get_global_sam_sid()) {
1137                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1138                 exit(1);
1139         }
1140
1141         if (!sessionid_init()) {
1142                 exit(1);
1143         }
1144
1145         if (!connections_init(True))
1146                 exit(1);
1147
1148         if (!locking_init())
1149                 exit(1);
1150
1151         if (!messaging_tdb_parent_init(smbd_event_context())) {
1152                 exit(1);
1153         }
1154
1155         if (!notify_internal_parent_init(smbd_event_context())) {
1156                 exit(1);
1157         }
1158
1159         if (!serverid_parent_init(smbd_event_context())) {
1160                 exit(1);
1161         }
1162
1163         if (!printer_list_parent_init()) {
1164                 exit(1);
1165         }
1166
1167         if (!W_ERROR_IS_OK(registry_init_full()))
1168                 exit(1);
1169
1170         if (!print_backend_init(smbd_messaging_context()))
1171                 exit(1);
1172
1173         /* Open the share_info.tdb here, so we don't have to open
1174            after the fork on every single connection.  This is a small
1175            performance improvment and reduces the total number of system
1176            fds used. */
1177         if (!share_info_db_init()) {
1178                 DEBUG(0,("ERROR: failed to load share info db.\n"));
1179                 exit(1);
1180         }
1181
1182         if (!init_system_info()) {
1183                 DEBUG(0,("ERROR: failed to setup system user info.\n"));
1184                 return -1;
1185         }
1186
1187         if (!init_guest_info()) {
1188                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1189                 return -1;
1190         }
1191
1192         if (!file_init(smbd_server_conn)) {
1193                 DEBUG(0, ("ERROR: file_init failed\n"));
1194                 return -1;
1195         }
1196
1197         if (!srv_rpc_register(smbd_server_conn->msg_ctx)) {
1198                 exit(1);
1199         }
1200
1201         /* Publish nt printers, this requires a working winreg pipe */
1202         pcap_cache_reload(server_event_context(), smbd_messaging_context(),
1203                           &reload_printers);
1204
1205         /* only start the background queue daemon if we are
1206            running as a daemon -- bad things will happen if
1207            smbd is launched via inetd and we fork a copy of
1208            ourselves here */
1209
1210         if (is_daemon && !interactive
1211             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1212                 start_background_queue(smbd_event_context(),
1213                                        smbd_messaging_context());
1214         }
1215
1216         if (!is_daemon) {
1217                 /* inetd mode */
1218                 TALLOC_FREE(frame);
1219
1220                 /* Started from inetd. fd 0 is the socket. */
1221                 /* We will abort gracefully when the client or remote system
1222                    goes away */
1223                 smbd_set_server_fd(dup(0));
1224
1225                 /* close our standard file descriptors */
1226                 close_low_fds(False); /* Don't close stderr */
1227
1228 #ifdef HAVE_ATEXIT
1229                 atexit(killkids);
1230 #endif
1231
1232                 /* Stop zombies */
1233                 smbd_setup_sig_chld_handler();
1234
1235                 smbd_process(smbd_server_conn);
1236
1237                 exit_server_cleanly(NULL);
1238                 return(0);
1239         }
1240
1241         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1242         if (!parent) {
1243                 exit_server("talloc(struct smbd_parent_context) failed");
1244         }
1245         parent->interactive = interactive;
1246
1247         if (!open_sockets_smbd(parent, smbd_messaging_context(), ports))
1248                 exit_server("open_sockets_smbd() failed");
1249
1250         TALLOC_FREE(frame);
1251         /* make sure we always have a valid stackframe */
1252         frame = talloc_stackframe();
1253
1254         smbd_parent_loop(parent);
1255
1256         exit_server_cleanly(NULL);
1257         TALLOC_FREE(frame);
1258         return(0);
1259 }