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         if (unclean_shutdown) {
 287                 /* a child terminated uncleanly so tickle all
 288                    processes to see if they can grab any of the
 289                    pending locks
 290                 */
 291                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
 292                         (unsigned int)pid));
 293                 if (!cleanup_te) {
 294                         /* call the cleanup timer, but not too often */
 295                         int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
 296                         cleanup_te = event_add_timed(smbd_event_context(), NULL,
 297                                                 timeval_current_ofs(cleanup_time, 0),
 298                                                 cleanup_timeout_fn,
 299                                                 &cleanup_te);
 300                         DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
 301                 }
 302         }
 303
 304         child_id = procid_self(); /* Just initialize pid and potentially vnn */
 305         child_id.pid = pid;
 306
 307         if (!serverid_deregister(child_id)) {
 308                 DEBUG(1, ("Could not remove pid %d from serverid.tdb\n",
 309                           (int)pid));
 310         }
 311
 312         for (child = children; child != NULL; child = child->next) {
 313                 if (child->pid == pid) {
 314                         struct child_pid *tmp = child;
 315                         DLIST_REMOVE(children, child);
 316                         SAFE_FREE(tmp);
 317                         num_children -= 1;
 318                         return;
 319                 }
 320         }
 321
 322         /* not all forked child processes are added to the children list */
 323         DEBUG(1, ("Could not find child %d -- ignoring\n", (int)pid));
 324 }
 325
 326 /****************************************************************************
 327  Have we reached the process limit ?
 328 ****************************************************************************/
 329
 330 static bool allowable_number_of_smbd_processes(void)
 331 {
 332         int max_processes = lp_max_smbd_processes();
 333
 334         if (!max_processes)
 335                 return True;
 336
 337         return num_children < max_processes;
 338 }
 339
 340 static void smbd_sig_chld_handler(struct tevent_context *ev,
 341                                   struct tevent_signal *se,
 342                                   int signum,
 343                                   int count,
 344                                   void *siginfo,
 345                                   void *private_data)
 346 {
 347         pid_t pid;
 348         int status;
 349
 350         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 351                 bool unclean_shutdown = False;
 352
 353                 /* If the child terminated normally, assume
 354                    it was an unclean shutdown unless the
 355                    status is 0
 356                 */
 357                 if (WIFEXITED(status)) {
 358                         unclean_shutdown = WEXITSTATUS(status);
 359                 }
 360                 /* If the child terminated due to a signal
 361                    we always assume it was unclean.
 362                 */
 363                 if (WIFSIGNALED(status)) {
 364                         unclean_shutdown = True;
 365                 }
 366                 remove_child_pid(pid, unclean_shutdown);
 367         }
 368 }
 369
 370 static void smbd_setup_sig_chld_handler(void)
 371 {
 372         struct tevent_signal *se;
 373
 374         se = tevent_add_signal(smbd_event_context(),
 375                                smbd_event_context(),
 376                                SIGCHLD, 0,
 377                                smbd_sig_chld_handler,
 378                                NULL);
 379         if (!se) {
 380                 exit_server("failed to setup SIGCHLD handler");
 381         }
 382 }
 383
 384 struct smbd_open_socket;
 385
 386 struct smbd_parent_context {
 387         bool interactive;
 388
 389         /* the list of listening sockets */
 390         struct smbd_open_socket *sockets;
 391 };
 392
 393 struct smbd_open_socket {
 394         struct smbd_open_socket *prev, *next;
 395         struct smbd_parent_context *parent;
 396         int fd;
 397         struct tevent_fd *fde;
 398 };
 399
 400 static void smbd_open_socket_close_fn(struct tevent_context *ev,
 401                                       struct tevent_fd *fde,
 402                                       int fd,
 403                                       void *private_data)
 404 {
 405         /* this might be the socket_wrapper swrap_close() */
 406         close(fd);
 407 }
 408
 409 static void smbd_accept_connection(struct tevent_context *ev,
 410                                    struct tevent_fd *fde,
 411                                    uint16_t flags,
 412                                    void *private_data)
 413 {
 414         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
 415                                      struct smbd_open_socket);
 416         struct sockaddr_storage addr;
 417         socklen_t in_addrlen = sizeof(addr);
 418         int fd;
 419         pid_t pid = 0;
 420         uint64_t unique_id;
 421
 422         fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
 423         smbd_set_server_fd(fd);
 424
 425         if (fd == -1 && errno == EINTR)
 426                 return;
 427
 428         if (fd == -1) {
 429                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 430                          strerror(errno)));
 431                 return;
 432         }
 433
 434         if (s->parent->interactive) {
 435                 smbd_process(smbd_server_conn);
 436                 exit_server_cleanly("end of interactive mode");
 437                 return;
 438         }
 439
 440         if (!allowable_number_of_smbd_processes()) {
 441                 close(fd);
 442                 smbd_set_server_fd(-1);
 443                 return;
 444         }
 445
 446         /*
 447          * Generate a unique id in the parent process so that we use
 448          * the global random state in the parent.
 449          */
 450         unique_id = serverid_get_random_unique_id();
 451
 452         pid = sys_fork();
 453         if (pid == 0) {
 454                 NTSTATUS status = NT_STATUS_OK;
 455
 456                 /* Child code ... */
 457                 am_parent = 0;
 458
 459                 set_my_unique_id(unique_id);
 460
 461                 /* Stop zombies, the parent explicitly handles
 462                  * them, counting worker smbds. */
 463                 CatchChild();
 464
 465                 /* close our standard file
 466                    descriptors */
 467                 close_low_fds(False);
 468
 469                 /*
 470                  * Can't use TALLOC_FREE here. Nulling out the argument to it
 471                  * would overwrite memory we've just freed.
 472                  */
 473                 talloc_free(s->parent);
 474                 s = NULL;
 475
 476                 status = reinit_after_fork(smbd_messaging_context(),
 477                                            smbd_event_context(), procid_self(),
 478                                            true);
 479                 if (!NT_STATUS_IS_OK(status)) {
 480                         if (NT_STATUS_EQUAL(status,
 481                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
 482                                 DEBUG(0,("child process cannot initialize "
 483                                          "because too many files are open\n"));
 484                                 goto exit;
 485                         }
 486                         if (lp_clustering() &&
 487                             NT_STATUS_EQUAL(status,
 488                             NT_STATUS_INTERNAL_DB_ERROR)) {
 489                                 DEBUG(1,("child process cannot initialize "
 490                                          "because connection to CTDB "
 491                                          "has failed\n"));
 492                                 goto exit;
 493                         }
 494
 495                         DEBUG(0,("reinit_after_fork() failed\n"));
 496                         smb_panic("reinit_after_fork() failed");
 497                 }
 498
 499                 smbd_setup_sig_term_handler();
 500                 smbd_setup_sig_hup_handler(server_event_context(),
 501                                            server_messaging_context());
 502
 503                 if (!serverid_register(procid_self(),
 504                                        FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 505                                        |FLAG_MSG_DBWRAP
 506                                        |FLAG_MSG_PRINT_GENERAL)) {
 507                         exit_server_cleanly("Could not register myself in "
 508                                             "serverid.tdb");
 509                 }
 510
 511                 smbd_process(smbd_server_conn);
 512          exit:
 513                 exit_server_cleanly("end of child");
 514                 return;
 515         }
 516
 517         if (pid < 0) {
 518                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
 519                          strerror(errno)));
 520         }
 521
 522         /* The parent doesn't need this socket */
 523         close(fd);
 524
 525         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 526                 Clear the closed fd info out of server_fd --
 527                 and more importantly, out of client_fd in
 528                 util_sock.c, to avoid a possible
 529                 getpeername failure if we reopen the logs
 530                 and use %I in the filename.
 531         */
 532
 533         smbd_set_server_fd(-1);
 534
 535         if (pid != 0) {
 536                 add_child_pid(pid);
 537         }
 538
 539         /* Force parent to check log size after
 540          * spawning child.  Fix from
 541          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 542          * parent smbd will log to logserver.smb.  It
 543          * writes only two messages for each child
 544          * started/finished. But each child writes,
 545          * say, 50 messages also in logserver.smb,
 546          * begining with the debug_count of the
 547          * parent, before the child opens its own log
 548          * file logserver.client. In a worst case
 549          * scenario the size of logserver.smb would be
 550          * checked after about 50*50=2500 messages
 551          * (ca. 100kb).
 552          * */
 553         force_check_log_size();
 554 }
 555
 556 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
 557                                  const struct sockaddr_storage *ifss,
 558                                  uint16_t port)
 559 {
 560         struct smbd_open_socket *s;
 561
 562         s = talloc(parent, struct smbd_open_socket);
 563         if (!s) {
 564                 return false;
 565         }
 566
 567         s->parent = parent;
 568         s->fd = open_socket_in(SOCK_STREAM,
 569                                port,
 570                                parent->sockets == NULL ? 0 : 2,
 571                                ifss,
 572                                true);
 573         if (s->fd == -1) {
 574                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
 575                         "%s\n", strerror(errno)));
 576                 TALLOC_FREE(s);
 577                 /*
 578                  * We ignore an error here, as we've done before
 579                  */
 580                 return true;
 581         }
 582
 583         /* ready to listen */
 584         set_socket_options(s->fd, "SO_KEEPALIVE");
 585         set_socket_options(s->fd, lp_socket_options());
 586
 587         /* Set server socket to
 588          * non-blocking for the accept. */
 589         set_blocking(s->fd, False);
 590
 591         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
 592                 DEBUG(0,("open_sockets_smbd: listen: "
 593                         "%s\n", strerror(errno)));
 594                         close(s->fd);
 595                 TALLOC_FREE(s);
 596                 return false;
 597         }
 598
 599         s->fde = tevent_add_fd(smbd_event_context(),
 600                                s,
 601                                s->fd, TEVENT_FD_READ,
 602                                smbd_accept_connection,
 603                                s);
 604         if (!s->fde) {
 605                 DEBUG(0,("open_sockets_smbd: "
 606                          "tevent_add_fd: %s\n",
 607                          strerror(errno)));
 608                 close(s->fd);
 609                 TALLOC_FREE(s);
 610                 return false;
 611         }
 612         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
 613
 614         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
 615
 616         return true;
 617 }
 618
 619 static bool smbd_parent_housekeeping(const struct timeval *now, void *private_data)
 620 {
 621         time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
 622         time_t t = time_mono(NULL);
 623
 624         DEBUG(5, ("parent housekeeping\n"));
 625
 626         /* if periodic printcap rescan is enabled, see if it's time to reload */
 627         if ((printcap_cache_time != 0)
 628          && (t >= (last_printer_reload_time + printcap_cache_time))) {
 629                 DEBUG( 3,( "Printcap cache time expired.\n"));
 630                 pcap_cache_reload(server_event_context(),
 631                                   smbd_messaging_context(),
 632                                   &reload_pcap_change_notify);
 633                 last_printer_reload_time = t;
 634         }
 635
 636         return true;
 637 }
 638
 639 /****************************************************************************
 640  Open the socket communication.
 641 ****************************************************************************/
 642
 643 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 644                               struct messaging_context *msg_ctx,
 645                               const char *smb_ports)
 646 {
 647         int num_interfaces = iface_count();
 648         int i;
 649         char *ports;
 650         unsigned dns_port = 0;
 651
 652 #ifdef HAVE_ATEXIT
 653         atexit(killkids);
 654 #endif
 655
 656         /* Stop zombies */
 657         smbd_setup_sig_chld_handler();
 658
 659         /* use a reasonable default set of ports - listing on 445 and 139 */
 660         if (!smb_ports) {
 661                 ports = lp_smb_ports();
 662                 if (!ports || !*ports) {
 663                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 664                 } else {
 665                         ports = talloc_strdup(talloc_tos(), ports);
 666                 }
 667         } else {
 668                 ports = talloc_strdup(talloc_tos(), smb_ports);
 669         }
 670
 671         if (lp_interfaces() && lp_bind_interfaces_only()) {
 672                 /* We have been given an interfaces line, and been
 673                    told to only bind to those interfaces. Create a
 674                    socket per interface and bind to only these.
 675                 */
 676
 677                 /* Now open a listen socket for each of the
 678                    interfaces. */
 679                 for(i = 0; i < num_interfaces; i++) {
 680                         const struct sockaddr_storage *ifss =
 681                                         iface_n_sockaddr_storage(i);
 682                         char *tok;
 683                         const char *ptr;
 684
 685                         if (ifss == NULL) {
 686                                 DEBUG(0,("open_sockets_smbd: "
 687                                         "interface %d has NULL IP address !\n",
 688                                         i));
 689                                 continue;
 690                         }
 691
 692                         for (ptr=ports;
 693                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 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                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 707                                         return false;
 708                                 }
 709                         }
 710                 }
 711         } else {
 712                 /* Just bind to 0.0.0.0 - accept connections
 713                    from anywhere. */
 714
 715                 char *tok;
 716                 const char *ptr;
 717                 const char *sock_addr = lp_socket_address();
 718                 char *sock_tok;
 719                 const char *sock_ptr;
 720
 721                 if (strequal(sock_addr, "0.0.0.0") ||
 722                     strequal(sock_addr, "::")) {
 723 #if HAVE_IPV6
 724                         sock_addr = "::,0.0.0.0";
 725 #else
 726                         sock_addr = "0.0.0.0";
 727 #endif
 728                 }
 729
 730                 for (sock_ptr=sock_addr;
 731                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 732                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 733                                 struct sockaddr_storage ss;
 734
 735                                 unsigned port = atoi(tok);
 736                                 if (port == 0 || port > 0xffff) {
 737                                         continue;
 738                                 }
 739
 740                                 /* Keep the first port for mDNS service
 741                                  * registration.
 742                                  */
 743                                 if (dns_port == 0) {
 744                                         dns_port = port;
 745                                 }
 746
 747                                 /* open an incoming socket */
 748                                 if (!interpret_string_addr(&ss, sock_tok,
 749                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 750                                         continue;
 751                                 }
 752
 753                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 754                                         return false;
 755                                 }
 756                         }
 757                 }
 758         }
 759
 760         if (parent->sockets == NULL) {
 761                 DEBUG(0,("open_sockets_smbd: No "
 762                         "sockets available to bind to.\n"));
 763                 return false;
 764         }
 765
 766         /* Setup the main smbd so that we can get messages. Note that
 767            do this after starting listening. This is needed as when in
 768            clustered mode, ctdb won't allow us to start doing database
 769            operations until it has gone thru a full startup, which
 770            includes checking to see that smbd is listening. */
 771
 772         if (!serverid_register(procid_self(),
 773                                FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 774                                |FLAG_MSG_DBWRAP)) {
 775                 DEBUG(0, ("open_sockets_smbd: Failed to register "
 776                           "myself in serverid.tdb\n"));
 777                 return false;
 778         }
 779
 780         if (!(event_add_idle(smbd_event_context(), NULL,
 781                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
 782                              "parent_housekeeping", smbd_parent_housekeeping,
 783                              NULL))) {
 784                 DEBUG(0, ("Could not add parent_housekeeping event\n"));
 785                 return false;
 786         }
 787
 788         /* Listen to messages */
 789
 790         messaging_register(msg_ctx, NULL, MSG_SMB_SAM_SYNC, msg_sam_sync);
 791         messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
 792         messaging_register(msg_ctx, NULL, MSG_SMB_FILE_RENAME,
 793                            msg_file_was_renamed);
 794         messaging_register(msg_ctx, server_event_context(), MSG_SMB_CONF_UPDATED,
 795                            smb_conf_updated);
 796         messaging_register(msg_ctx, NULL, MSG_SMB_STAT_CACHE_DELETE,
 797                            smb_stat_cache_delete);
 798         messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
 799         messaging_register(msg_ctx, server_event_context(), MSG_PRINTER_PCAP,
 800                            smb_pcap_updated);
 801         brl_register_msgs(msg_ctx);
 802
 803         msg_idmap_register_msgs(msg_ctx);
 804
 805 #ifdef CLUSTER_SUPPORT
 806         if (lp_clustering()) {
 807                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 808         }
 809 #endif
 810
 811 #ifdef DEVELOPER
 812         messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
 813                            msg_inject_fault);
 814 #endif
 815
 816         if (lp_multicast_dns_register() && (dns_port != 0)) {
 817 #ifdef WITH_DNSSD_SUPPORT
 818                 smbd_setup_mdns_registration(smbd_event_context(),
 819                                              parent, dns_port);
 820 #endif
 821 #ifdef WITH_AVAHI_SUPPORT
 822                 void *avahi_conn;
 823
 824                 avahi_conn = avahi_start_register(
 825                         smbd_event_context(), smbd_event_context(), dns_port);
 826                 if (avahi_conn == NULL) {
 827                         DEBUG(10, ("avahi_start_register failed\n"));
 828                 }
 829 #endif
 830         }
 831
 832         return true;
 833 }
 834
 835 static void smbd_parent_loop(struct smbd_parent_context *parent)
 836 {
 837         /* now accept incoming connections - forking a new process
 838            for each incoming connection */
 839         DEBUG(2,("waiting for connections\n"));
 840         while (1) {
 841                 int ret;
 842                 TALLOC_CTX *frame = talloc_stackframe();
 843
 844                 ret = tevent_loop_once(smbd_event_context());
 845                 if (ret != 0) {
 846                         exit_server_cleanly("tevent_loop_once() error");
 847                 }
 848
 849                 TALLOC_FREE(frame);
 850         } /* end while 1 */
 851
 852 /* NOTREACHED   return True; */
 853 }
 854
 855
 856 /****************************************************************************
 857  Initialise connect, service and file structs.
 858 ****************************************************************************/
 859
 860 static bool init_structs(void )
 861 {
 862         /*
 863          * Set the machine NETBIOS name if not already
 864          * set from the config file.
 865          */
 866
 867         if (!init_names())
 868                 return False;
 869
 870         if (!secrets_init())
 871                 return False;
 872
 873         return True;
 874 }
 875
 876 /****************************************************************************
 877  main program.
 878 ****************************************************************************/
 879
 880 /* Declare prototype for build_options() to avoid having to run it through
 881    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 882    prototype generation system is too complicated. */
 883
 884 extern void build_options(bool screen);
 885
 886  int main(int argc,const char *argv[])
 887 {
 888         /* shall I run as a daemon */
 889         bool is_daemon = false;
 890         bool interactive = false;
 891         bool Fork = true;
 892         bool no_process_group = false;
 893         bool log_stdout = false;
 894         char *ports = NULL;
 895         char *profile_level = NULL;
 896         int opt;
 897         poptContext pc;
 898         bool print_build_options = False;
 899         enum {
 900                 OPT_DAEMON = 1000,
 901                 OPT_INTERACTIVE,
 902                 OPT_FORK,
 903                 OPT_NO_PROCESS_GROUP,
 904                 OPT_LOG_STDOUT
 905         };
 906         struct poptOption long_options[] = {
 907         POPT_AUTOHELP
 908         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 909         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 910         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 911         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 912         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 913         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 914         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 915         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 916         POPT_COMMON_SAMBA
 917         POPT_COMMON_DYNCONFIG
 918         POPT_TABLEEND
 919         };
 920         struct smbd_parent_context *parent = NULL;
 921         TALLOC_CTX *frame;
 922         NTSTATUS status;
 923
 924         /*
 925          * Do this before any other talloc operation
 926          */
 927         talloc_enable_null_tracking();
 928         frame = talloc_stackframe();
 929
 930         load_case_tables();
 931
 932         /* Initialize the event context, it will panic on error */
 933         smbd_event_context();
 934
 935         smbd_init_globals();
 936
 937         TimeInit();
 938
 939 #ifdef HAVE_SET_AUTH_PARAMETERS
 940         set_auth_parameters(argc,argv);
 941 #endif
 942
 943         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 944         while((opt = poptGetNextOpt(pc)) != -1) {
 945                 switch (opt)  {
 946                 case OPT_DAEMON:
 947                         is_daemon = true;
 948                         break;
 949                 case OPT_INTERACTIVE:
 950                         interactive = true;
 951                         break;
 952                 case OPT_FORK:
 953                         Fork = false;
 954                         break;
 955                 case OPT_NO_PROCESS_GROUP:
 956                         no_process_group = true;
 957                         break;
 958                 case OPT_LOG_STDOUT:
 959                         log_stdout = true;
 960                         break;
 961                 case 'b':
 962                         print_build_options = True;
 963                         break;
 964                 default:
 965                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 966                                   poptBadOption(pc, 0), poptStrerror(opt));
 967                         poptPrintUsage(pc, stderr, 0);
 968                         exit(1);
 969                 }
 970         }
 971         poptFreeContext(pc);
 972
 973         if (interactive) {
 974                 Fork = False;
 975                 log_stdout = True;
 976         }
 977
 978         if (log_stdout) {
 979                 setup_logging(argv[0], DEBUG_STDOUT);
 980         } else {
 981                 setup_logging(argv[0], DEBUG_FILE);
 982         }
 983
 984         if (print_build_options) {
 985                 build_options(True); /* Display output to screen as well as debug */
 986                 exit(0);
 987         }
 988
 989 #ifdef HAVE_SETLUID
 990         /* needed for SecureWare on SCO */
 991         setluid(0);
 992 #endif
 993
 994         set_remote_machine_name("smbd", False);
 995
 996         if (interactive && (DEBUGLEVEL >= 9)) {
 997                 talloc_enable_leak_report();
 998         }
 999
1000         if (log_stdout && Fork) {
1001                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1002                 exit(1);
1003         }
1004
1005         /* we want to re-seed early to prevent time delays causing
1006            client problems at a later date. (tridge) */
1007         generate_random_buffer(NULL, 0);
1008
1009         /* get initial effective uid and gid */
1010         sec_init();
1011
1012         /* make absolutely sure we run as root - to handle cases where people
1013            are crazy enough to have it setuid */
1014         gain_root_privilege();
1015         gain_root_group_privilege();
1016
1017         fault_setup((void (*)(void *))exit_server_fault);
1018         dump_core_setup("smbd");
1019
1020         /* we are never interested in SIGPIPE */
1021         BlockSignals(True,SIGPIPE);
1022
1023 #if defined(SIGFPE)
1024         /* we are never interested in SIGFPE */
1025         BlockSignals(True,SIGFPE);
1026 #endif
1027
1028 #if defined(SIGUSR2)
1029         /* We are no longer interested in USR2 */
1030         BlockSignals(True,SIGUSR2);
1031 #endif
1032
1033         /* POSIX demands that signals are inherited. If the invoking process has
1034          * these signals masked, we will have problems, as we won't recieve them. */
1035         BlockSignals(False, SIGHUP);
1036         BlockSignals(False, SIGUSR1);
1037         BlockSignals(False, SIGTERM);
1038
1039         /* Ensure we leave no zombies until we
1040          * correctly set up child handling below. */
1041
1042         CatchChild();
1043
1044         /* we want total control over the permissions on created files,
1045            so set our umask to 0 */
1046         umask(0);
1047
1048         reopen_logs();
1049
1050         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1051         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1052
1053         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1054                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1055
1056         /* Output the build options to the debug log */
1057         build_options(False);
1058
1059         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1060                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1061                 exit(1);
1062         }
1063
1064         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1065                 DEBUG(0, ("error opening config file\n"));
1066                 exit(1);
1067         }
1068
1069         /* Init the security context and global current_user */
1070         init_sec_ctx();
1071
1072         if (smbd_messaging_context() == NULL)
1073                 exit(1);
1074
1075         /*
1076          * Reloading of the printers will not work here as we don't have a
1077          * server info and rpc services set up. It will be called later.
1078          */
1079         if (!reload_services(smbd_messaging_context(), -1, False)) {
1080                 exit(1);
1081         }
1082
1083         /* ...NOTE... Log files are working from this point! */
1084
1085         DEBUG(3,("loaded services\n"));
1086
1087         init_structs();
1088
1089 #ifdef WITH_PROFILE
1090         if (!profile_setup(smbd_messaging_context(), False)) {
1091                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1092                 return -1;
1093         }
1094         if (profile_level != NULL) {
1095                 int pl = atoi(profile_level);
1096                 struct server_id src;
1097
1098                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1099                 src.pid = getpid();
1100                 set_profile_level(pl, src);
1101         }
1102 #endif
1103
1104         if (!is_daemon && !is_a_socket(0)) {
1105                 if (!interactive)
1106                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1107
1108                 /*
1109                  * Setting is_daemon here prevents us from eventually calling
1110                  * the open_sockets_inetd()
1111                  */
1112
1113                 is_daemon = True;
1114         }
1115
1116         if (is_daemon && !interactive) {
1117                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1118                 become_daemon(Fork, no_process_group, log_stdout);
1119         }
1120
1121         set_my_unique_id(serverid_get_random_unique_id());
1122
1123 #if HAVE_SETPGID
1124         /*
1125          * If we're interactive we want to set our own process group for
1126          * signal management.
1127          */
1128         if (interactive && !no_process_group)
1129                 setpgid( (pid_t)0, (pid_t)0);
1130 #endif
1131
1132         if (!directory_exist(lp_lockdir()))
1133                 mkdir(lp_lockdir(), 0755);
1134
1135         if (is_daemon)
1136                 pidfile_create("smbd");
1137
1138         status = reinit_after_fork(smbd_messaging_context(),
1139                                    smbd_event_context(),
1140                                    procid_self(), false);
1141         if (!NT_STATUS_IS_OK(status)) {
1142                 DEBUG(0,("reinit_after_fork() failed\n"));
1143                 exit(1);
1144         }
1145
1146         smbd_server_conn->msg_ctx = smbd_messaging_context();
1147
1148         smbd_setup_sig_term_handler();
1149         smbd_setup_sig_hup_handler(smbd_event_context(),
1150                                    smbd_server_conn->msg_ctx);
1151
1152         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1153
1154         if (smbd_memcache() == NULL) {
1155                 exit(1);
1156         }
1157
1158         memcache_set_global(smbd_memcache());
1159
1160         /* Initialise the password backed before the global_sam_sid
1161            to ensure that we fetch from ldap before we make a domain sid up */
1162
1163         if(!initialize_password_db(False, smbd_event_context()))
1164                 exit(1);
1165
1166         if (!secrets_init()) {
1167                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1168                 exit(1);
1169         }
1170
1171         if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC) {
1172                 if (!open_schannel_session_store(NULL, lp_private_dir())) {
1173                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
1174                         exit(1);
1175                 }
1176         }
1177
1178         if(!get_global_sam_sid()) {
1179                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1180                 exit(1);
1181         }
1182
1183         if (!sessionid_init()) {
1184                 exit(1);
1185         }
1186
1187         if (!connections_init(True))
1188                 exit(1);
1189
1190         if (!locking_init())
1191                 exit(1);
1192
1193         if (!messaging_tdb_parent_init(smbd_event_context())) {
1194                 exit(1);
1195         }
1196
1197         if (!notify_internal_parent_init(smbd_event_context())) {
1198                 exit(1);
1199         }
1200
1201         if (!serverid_parent_init(smbd_event_context())) {
1202                 exit(1);
1203         }
1204
1205         if (!printer_list_parent_init()) {
1206                 exit(1);
1207         }
1208
1209         if (!W_ERROR_IS_OK(registry_init_full()))
1210                 exit(1);
1211
1212         /* Open the share_info.tdb here, so we don't have to open
1213            after the fork on every single connection.  This is a small
1214            performance improvment and reduces the total number of system
1215            fds used. */
1216         if (!share_info_db_init()) {
1217                 DEBUG(0,("ERROR: failed to load share info db.\n"));
1218                 exit(1);
1219         }
1220
1221         status = init_system_info();
1222         if (!NT_STATUS_IS_OK(status)) {
1223                 DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
1224                           nt_errstr(status)));
1225                 return -1;
1226         }
1227
1228         if (!print_backend_init(smbd_messaging_context()))
1229                 exit(1);
1230
1231         if (!init_guest_info()) {
1232                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1233                 return -1;
1234         }
1235
1236         if (!file_init(smbd_server_conn)) {
1237                 DEBUG(0, ("ERROR: file_init failed\n"));
1238                 return -1;
1239         }
1240
1241         if (is_daemon && !interactive) {
1242                 const char *rpcsrv_type;
1243
1244                 rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
1245                                                    "rpc_server", "epmapper",
1246                                                    "none");
1247                 if (StrCaseCmp(rpcsrv_type, "daemon") == 0) {
1248                         start_epmd(smbd_event_context(),
1249                                    smbd_server_conn->msg_ctx);
1250                 }
1251         }
1252
1253         if (!dcesrv_ep_setup(smbd_event_context(), smbd_server_conn->msg_ctx)) {
1254                 exit(1);
1255         }
1256
1257         /* Publish nt printers, this requires a working winreg pipe */
1258         pcap_cache_reload(server_event_context(), smbd_messaging_context(),
1259                           &reload_printers);
1260
1261         /* only start the background queue daemon if we are
1262            running as a daemon -- bad things will happen if
1263            smbd is launched via inetd and we fork a copy of
1264            ourselves here */
1265
1266         if (is_daemon && !interactive
1267             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1268                 start_background_queue(smbd_event_context(),
1269                                        smbd_messaging_context());
1270         }
1271
1272         if (is_daemon && !_lp_disable_spoolss()) {
1273                 const char *rpcsrv_type;
1274
1275                 /* start spoolss daemon */
1276                 /* start as a separate daemon only if enabled */
1277                 rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
1278                                                    "rpc_server", "spoolss",
1279                                                    "embedded");
1280                 if (StrCaseCmp(rpcsrv_type, "daemon") == 0) {
1281                         start_spoolssd(smbd_event_context(),
1282                                        smbd_messaging_context());
1283                 }
1284         }
1285
1286         if (!is_daemon) {
1287                 /* inetd mode */
1288                 TALLOC_FREE(frame);
1289
1290                 /* Started from inetd. fd 0 is the socket. */
1291                 /* We will abort gracefully when the client or remote system
1292                    goes away */
1293                 smbd_set_server_fd(dup(0));
1294
1295                 /* close our standard file descriptors */
1296                 close_low_fds(False); /* Don't close stderr */
1297
1298 #ifdef HAVE_ATEXIT
1299                 atexit(killkids);
1300 #endif
1301
1302                 /* Stop zombies */
1303                 smbd_setup_sig_chld_handler();
1304
1305                 smbd_process(smbd_server_conn);
1306
1307                 exit_server_cleanly(NULL);
1308                 return(0);
1309         }
1310
1311         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1312         if (!parent) {
1313                 exit_server("talloc(struct smbd_parent_context) failed");
1314         }
1315         parent->interactive = interactive;
1316
1317         if (!open_sockets_smbd(parent, smbd_messaging_context(), ports))
1318                 exit_server("open_sockets_smbd() failed");
1319
1320         TALLOC_FREE(frame);
1321         /* make sure we always have a valid stackframe */
1322         frame = talloc_stackframe();
1323
1324         smbd_parent_loop(parent);
1325
1326         exit_server_cleanly(NULL);
1327         TALLOC_FREE(frame);
1328         return(0);
1329 }