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 /*******************************************************************
  55  What to do when smb.conf is updated.
  56  ********************************************************************/
  57
  58 static void smb_conf_updated(struct messaging_context *msg,
  59                              void *private_data,
  60                              uint32_t msg_type,
  61                              struct server_id server_id,
  62                              DATA_BLOB *data)
  63 {
  64         struct tevent_context *ev_ctx =
  65                 talloc_get_type_abort(private_data, struct tevent_context);
  66
  67         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
  68                   "updated. Reloading.\n"));
  69         change_to_root_user();
  70         reload_services(msg, smbd_server_conn->sock, False);
  71         if (am_parent) {
  72                 pcap_cache_reload(ev_ctx, msg,
  73                                   &reload_pcap_change_notify);
  74         }
  75 }
  76
  77 /*******************************************************************
  78  What to do when printcap is updated.
  79  ********************************************************************/
  80
  81 static void smb_pcap_updated(struct messaging_context *msg,
  82                              void *private_data,
  83                              uint32_t msg_type,
  84                              struct server_id server_id,
  85                              DATA_BLOB *data)
  86 {
  87         struct tevent_context *ev_ctx =
  88                 talloc_get_type_abort(private_data, struct tevent_context);
  89
  90         DEBUG(10,("Got message saying pcap was updated. Reloading.\n"));
  91         change_to_root_user();
  92         reload_printers(ev_ctx, msg);
  93 }
  94
  95 /*******************************************************************
  96  Delete a statcache entry.
  97  ********************************************************************/
  98
  99 static void smb_stat_cache_delete(struct messaging_context *msg,
 100                                   void *private_data,
 101                                   uint32_t msg_tnype,
 102                                   struct server_id server_id,
 103                                   DATA_BLOB *data)
 104 {
 105         const char *name = (const char *)data->data;
 106         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 107         stat_cache_delete(name);
 108 }
 109
 110 /****************************************************************************
 111   Send a SIGTERM to our process group.
 112 *****************************************************************************/
 113
 114 static void  killkids(void)
 115 {
 116         if(am_parent) kill(0,SIGTERM);
 117 }
 118
 119 /****************************************************************************
 120  Process a sam sync message - not sure whether to do this here or
 121  somewhere else.
 122 ****************************************************************************/
 123
 124 static void msg_sam_sync(struct messaging_context *msg,
 125                          void *private_data,
 126                          uint32_t msg_type,
 127                          struct server_id server_id,
 128                          DATA_BLOB *data)
 129 {
 130         DEBUG(10, ("** sam sync message received, ignoring\n"));
 131 }
 132
 133 static void msg_exit_server(struct messaging_context *msg,
 134                             void *private_data,
 135                             uint32_t msg_type,
 136                             struct server_id server_id,
 137                             DATA_BLOB *data)
 138 {
 139         DEBUG(3, ("got a SHUTDOWN message\n"));
 140         exit_server_cleanly(NULL);
 141 }
 142
 143 #ifdef DEVELOPER
 144 static void msg_inject_fault(struct messaging_context *msg,
 145                              void *private_data,
 146                              uint32_t msg_type,
 147                              struct server_id src,
 148                              DATA_BLOB *data)
 149 {
 150         int sig;
 151
 152         if (data->length != sizeof(sig)) {
 153                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 154                           procid_str_static(&src)));
 155                 return;
 156         }
 157
 158         sig = *(int *)data->data;
 159         if (sig == -1) {
 160                 exit_server("internal error injected");
 161                 return;
 162         }
 163
 164 #if HAVE_STRSIGNAL
 165         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 166                   procid_str_static(&src), sig, strsignal(sig)));
 167 #else
 168         DEBUG(0, ("Process %s requested injection of signal %d\n",
 169                   procid_str_static(&src), sig));
 170 #endif
 171
 172         kill(sys_getpid(), sig);
 173 }
 174 #endif /* DEVELOPER */
 175
 176 /*
 177  * Parent smbd process sets its own debug level first and then
 178  * sends a message to all the smbd children to adjust their debug
 179  * level to that of the parent.
 180  */
 181
 182 static void smbd_msg_debug(struct messaging_context *msg_ctx,
 183                            void *private_data,
 184                            uint32_t msg_type,
 185                            struct server_id server_id,
 186                            DATA_BLOB *data)
 187 {
 188         struct child_pid *child;
 189
 190         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 191
 192         for (child = children; child != NULL; child = child->next) {
 193                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 194                                    MSG_DEBUG,
 195                                    data->data,
 196                                    strlen((char *) data->data) + 1);
 197         }
 198 }
 199
 200 static void add_child_pid(pid_t pid)
 201 {
 202         struct child_pid *child;
 203
 204         child = SMB_MALLOC_P(struct child_pid);
 205         if (child == NULL) {
 206                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 207                 return;
 208         }
 209         child->pid = pid;
 210         DLIST_ADD(children, child);
 211         num_children += 1;
 212 }
 213
 214 /*
 215   at most every smbd:cleanuptime seconds (default 20), we scan the BRL
 216   and locking database for entries to cleanup. As a side effect this
 217   also cleans up dead entries in the connections database (due to the
 218   traversal in message_send_all()
 219
 220   Using a timer for this prevents a flood of traversals when a large
 221   number of clients disconnect at the same time (perhaps due to a
 222   network outage).
 223 */
 224
 225 static void cleanup_timeout_fn(struct event_context *event_ctx,
 226                                 struct timed_event *te,
 227                                 struct timeval now,
 228                                 void *private_data)
 229 {
 230         struct timed_event **cleanup_te = (struct timed_event **)private_data;
 231
 232         DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
 233         message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
 234         messaging_send_buf(smbd_messaging_context(), procid_self(),
 235                                 MSG_SMB_BRL_VALIDATE, NULL, 0);
 236         /* mark the cleanup as having been done */
 237         (*cleanup_te) = NULL;
 238 }
 239
 240 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 241 {
 242         struct child_pid *child;
 243         static struct timed_event *cleanup_te;
 244         struct server_id child_id;
 245
 246         if (unclean_shutdown) {
 247                 /* a child terminated uncleanly so tickle all
 248                    processes to see if they can grab any of the
 249                    pending locks
 250                 */
 251                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
 252                         (unsigned int)pid));
 253                 if (!cleanup_te) {
 254                         /* call the cleanup timer, but not too often */
 255                         int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
 256                         cleanup_te = event_add_timed(server_event_context(), NULL,
 257                                                 timeval_current_ofs(cleanup_time, 0),
 258                                                 cleanup_timeout_fn,
 259                                                 &cleanup_te);
 260                         DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
 261                 }
 262         }
 263
 264         child_id = procid_self(); /* Just initialize pid and potentially vnn */
 265         child_id.pid = pid;
 266
 267         if (!serverid_deregister(child_id)) {
 268                 DEBUG(1, ("Could not remove pid %d from serverid.tdb\n",
 269                           (int)pid));
 270         }
 271
 272         for (child = children; child != NULL; child = child->next) {
 273                 if (child->pid == pid) {
 274                         struct child_pid *tmp = child;
 275                         DLIST_REMOVE(children, child);
 276                         SAFE_FREE(tmp);
 277                         num_children -= 1;
 278                         return;
 279                 }
 280         }
 281
 282         /* not all forked child processes are added to the children list */
 283         DEBUG(1, ("Could not find child %d -- ignoring\n", (int)pid));
 284 }
 285
 286 /****************************************************************************
 287  Have we reached the process limit ?
 288 ****************************************************************************/
 289
 290 static bool allowable_number_of_smbd_processes(void)
 291 {
 292         int max_processes = lp_max_smbd_processes();
 293
 294         if (!max_processes)
 295                 return True;
 296
 297         return num_children < max_processes;
 298 }
 299
 300 static void smbd_sig_chld_handler(struct tevent_context *ev,
 301                                   struct tevent_signal *se,
 302                                   int signum,
 303                                   int count,
 304                                   void *siginfo,
 305                                   void *private_data)
 306 {
 307         pid_t pid;
 308         int status;
 309
 310         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 311                 bool unclean_shutdown = False;
 312
 313                 /* If the child terminated normally, assume
 314                    it was an unclean shutdown unless the
 315                    status is 0
 316                 */
 317                 if (WIFEXITED(status)) {
 318                         unclean_shutdown = WEXITSTATUS(status);
 319                 }
 320                 /* If the child terminated due to a signal
 321                    we always assume it was unclean.
 322                 */
 323                 if (WIFSIGNALED(status)) {
 324                         unclean_shutdown = True;
 325                 }
 326                 remove_child_pid(pid, unclean_shutdown);
 327         }
 328 }
 329
 330 static void smbd_setup_sig_chld_handler(void)
 331 {
 332         struct tevent_signal *se;
 333
 334         se = tevent_add_signal(server_event_context(),
 335                                server_event_context(),
 336                                SIGCHLD, 0,
 337                                smbd_sig_chld_handler,
 338                                NULL);
 339         if (!se) {
 340                 exit_server("failed to setup SIGCHLD handler");
 341         }
 342 }
 343
 344 struct smbd_open_socket;
 345
 346 struct smbd_parent_context {
 347         bool interactive;
 348
 349         /* the list of listening sockets */
 350         struct smbd_open_socket *sockets;
 351 };
 352
 353 struct smbd_open_socket {
 354         struct smbd_open_socket *prev, *next;
 355         struct smbd_parent_context *parent;
 356         int fd;
 357         struct tevent_fd *fde;
 358 };
 359
 360 static void smbd_open_socket_close_fn(struct tevent_context *ev,
 361                                       struct tevent_fd *fde,
 362                                       int fd,
 363                                       void *private_data)
 364 {
 365         /* this might be the socket_wrapper swrap_close() */
 366         close(fd);
 367 }
 368
 369 static void smbd_accept_connection(struct tevent_context *ev,
 370                                    struct tevent_fd *fde,
 371                                    uint16_t flags,
 372                                    void *private_data)
 373 {
 374         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
 375                                      struct smbd_open_socket);
 376         struct sockaddr_storage addr;
 377         socklen_t in_addrlen = sizeof(addr);
 378         int fd;
 379         pid_t pid = 0;
 380         uint64_t unique_id;
 381
 382         fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
 383         smbd_set_server_fd(fd);
 384
 385         if (fd == -1 && errno == EINTR)
 386                 return;
 387
 388         if (fd == -1) {
 389                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 390                          strerror(errno)));
 391                 return;
 392         }
 393
 394         if (s->parent->interactive) {
 395                 smbd_process(smbd_server_conn);
 396                 exit_server_cleanly("end of interactive mode");
 397                 return;
 398         }
 399
 400         if (!allowable_number_of_smbd_processes()) {
 401                 close(fd);
 402                 smbd_set_server_fd(-1);
 403                 return;
 404         }
 405
 406         /*
 407          * Generate a unique id in the parent process so that we use
 408          * the global random state in the parent.
 409          */
 410         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
 411
 412         pid = sys_fork();
 413         if (pid == 0) {
 414                 NTSTATUS status = NT_STATUS_OK;
 415
 416                 /* Child code ... */
 417                 am_parent = 0;
 418
 419                 set_my_unique_id(unique_id);
 420
 421                 /* Stop zombies, the parent explicitly handles
 422                  * them, counting worker smbds. */
 423                 CatchChild();
 424
 425                 /* close our standard file
 426                    descriptors */
 427                 close_low_fds(False);
 428
 429                 /*
 430                  * Can't use TALLOC_FREE here. Nulling out the argument to it
 431                  * would overwrite memory we've just freed.
 432                  */
 433                 talloc_free(s->parent);
 434                 s = NULL;
 435
 436                 status = reinit_after_fork(smbd_messaging_context(),
 437                                            server_event_context(), procid_self(),
 438                                            true);
 439                 if (!NT_STATUS_IS_OK(status)) {
 440                         if (NT_STATUS_EQUAL(status,
 441                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
 442                                 DEBUG(0,("child process cannot initialize "
 443                                          "because too many files are open\n"));
 444                                 goto exit;
 445                         }
 446                         DEBUG(0,("reinit_after_fork() failed\n"));
 447                         smb_panic("reinit_after_fork() failed");
 448                 }
 449
 450                 smbd_setup_sig_term_handler();
 451                 smbd_setup_sig_hup_handler(server_event_context(),
 452                                            server_messaging_context());
 453
 454                 if (!serverid_register(procid_self(),
 455                                        FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 456                                        |FLAG_MSG_DBWRAP
 457                                        |FLAG_MSG_PRINT_GENERAL)) {
 458                         exit_server_cleanly("Could not register myself in "
 459                                             "serverid.tdb");
 460                 }
 461
 462                 smbd_process(smbd_server_conn);
 463          exit:
 464                 exit_server_cleanly("end of child");
 465                 return;
 466         }
 467
 468         if (pid < 0) {
 469                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
 470                          strerror(errno)));
 471         }
 472
 473         /* The parent doesn't need this socket */
 474         close(fd);
 475
 476         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 477                 Clear the closed fd info out of server_fd --
 478                 and more importantly, out of client_fd in
 479                 util_sock.c, to avoid a possible
 480                 getpeername failure if we reopen the logs
 481                 and use %I in the filename.
 482         */
 483
 484         smbd_set_server_fd(-1);
 485
 486         if (pid != 0) {
 487                 add_child_pid(pid);
 488         }
 489
 490         /* Force parent to check log size after
 491          * spawning child.  Fix from
 492          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 493          * parent smbd will log to logserver.smb.  It
 494          * writes only two messages for each child
 495          * started/finished. But each child writes,
 496          * say, 50 messages also in logserver.smb,
 497          * begining with the debug_count of the
 498          * parent, before the child opens its own log
 499          * file logserver.client. In a worst case
 500          * scenario the size of logserver.smb would be
 501          * checked after about 50*50=2500 messages
 502          * (ca. 100kb).
 503          * */
 504         force_check_log_size();
 505 }
 506
 507 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
 508                                  const struct sockaddr_storage *ifss,
 509                                  uint16_t port)
 510 {
 511         struct smbd_open_socket *s;
 512
 513         s = talloc(parent, struct smbd_open_socket);
 514         if (!s) {
 515                 return false;
 516         }
 517
 518         s->parent = parent;
 519         s->fd = open_socket_in(SOCK_STREAM,
 520                                port,
 521                                parent->sockets == NULL ? 0 : 2,
 522                                ifss,
 523                                true);
 524         if (s->fd == -1) {
 525                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
 526                         "%s\n", strerror(errno)));
 527                 TALLOC_FREE(s);
 528                 /*
 529                  * We ignore an error here, as we've done before
 530                  */
 531                 return true;
 532         }
 533
 534         /* ready to listen */
 535         set_socket_options(s->fd, "SO_KEEPALIVE");
 536         set_socket_options(s->fd, lp_socket_options());
 537
 538         /* Set server socket to
 539          * non-blocking for the accept. */
 540         set_blocking(s->fd, False);
 541
 542         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
 543                 DEBUG(0,("open_sockets_smbd: listen: "
 544                         "%s\n", strerror(errno)));
 545                         close(s->fd);
 546                 TALLOC_FREE(s);
 547                 return false;
 548         }
 549
 550         s->fde = tevent_add_fd(server_event_context(),
 551                                s,
 552                                s->fd, TEVENT_FD_READ,
 553                                smbd_accept_connection,
 554                                s);
 555         if (!s->fde) {
 556                 DEBUG(0,("open_sockets_smbd: "
 557                          "tevent_add_fd: %s\n",
 558                          strerror(errno)));
 559                 close(s->fd);
 560                 TALLOC_FREE(s);
 561                 return false;
 562         }
 563         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
 564
 565         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
 566
 567         return true;
 568 }
 569
 570 static bool smbd_parent_housekeeping(const struct timeval *now, void *private_data)
 571 {
 572         time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
 573         time_t t = time_mono(NULL);
 574
 575         DEBUG(5, ("parent housekeeping\n"));
 576
 577         /* if periodic printcap rescan is enabled, see if it's time to reload */
 578         if ((printcap_cache_time != 0)
 579          && (t >= (last_printer_reload_time + printcap_cache_time))) {
 580                 DEBUG( 3,( "Printcap cache time expired.\n"));
 581                 pcap_cache_reload(server_event_context(),
 582                                   smbd_messaging_context(),
 583                                   &reload_pcap_change_notify);
 584                 last_printer_reload_time = t;
 585         }
 586
 587         return true;
 588 }
 589
 590 /****************************************************************************
 591  Open the socket communication.
 592 ****************************************************************************/
 593
 594 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 595                               struct messaging_context *msg_ctx,
 596                               const char *smb_ports)
 597 {
 598         int num_interfaces = iface_count();
 599         int i;
 600         const char *ports;
 601         unsigned dns_port = 0;
 602
 603 #ifdef HAVE_ATEXIT
 604         atexit(killkids);
 605 #endif
 606
 607         /* Stop zombies */
 608         smbd_setup_sig_chld_handler();
 609
 610         /* use a reasonable default set of ports - listing on 445 and 139 */
 611         if (!smb_ports) {
 612                 ports = lp_smb_ports();
 613                 if (!ports || !*ports) {
 614                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 615                 } else {
 616                         ports = talloc_strdup(talloc_tos(), ports);
 617                 }
 618         } else {
 619                 ports = talloc_strdup(talloc_tos(), smb_ports);
 620         }
 621
 622         if (lp_interfaces() && lp_bind_interfaces_only()) {
 623                 /* We have been given an interfaces line, and been
 624                    told to only bind to those interfaces. Create a
 625                    socket per interface and bind to only these.
 626                 */
 627
 628                 /* Now open a listen socket for each of the
 629                    interfaces. */
 630                 for(i = 0; i < num_interfaces; i++) {
 631                         const struct sockaddr_storage *ifss =
 632                                         iface_n_sockaddr_storage(i);
 633                         char *tok;
 634                         const char *ptr;
 635
 636                         if (ifss == NULL) {
 637                                 DEBUG(0,("open_sockets_smbd: "
 638                                         "interface %d has NULL IP address !\n",
 639                                         i));
 640                                 continue;
 641                         }
 642
 643                         for (ptr=ports;
 644                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 645                                 unsigned port = atoi(tok);
 646                                 if (port == 0 || port > 0xffff) {
 647                                         continue;
 648                                 }
 649
 650                                 /* Keep the first port for mDNS service
 651                                  * registration.
 652                                  */
 653                                 if (dns_port == 0) {
 654                                         dns_port = port;
 655                                 }
 656
 657                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 658                                         return false;
 659                                 }
 660                         }
 661                 }
 662         } else {
 663                 /* Just bind to 0.0.0.0 - accept connections
 664                    from anywhere. */
 665
 666                 char *tok;
 667                 const char *ptr;
 668                 const char *sock_addr = lp_socket_address();
 669                 char *sock_tok;
 670                 const char *sock_ptr;
 671
 672                 if (strequal(sock_addr, "0.0.0.0") ||
 673                     strequal(sock_addr, "::")) {
 674 #if HAVE_IPV6
 675                         sock_addr = "::,0.0.0.0";
 676 #else
 677                         sock_addr = "0.0.0.0";
 678 #endif
 679                 }
 680
 681                 for (sock_ptr=sock_addr;
 682                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 683                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 684                                 struct sockaddr_storage ss;
 685
 686                                 unsigned port = atoi(tok);
 687                                 if (port == 0 || port > 0xffff) {
 688                                         continue;
 689                                 }
 690
 691                                 /* Keep the first port for mDNS service
 692                                  * registration.
 693                                  */
 694                                 if (dns_port == 0) {
 695                                         dns_port = port;
 696                                 }
 697
 698                                 /* open an incoming socket */
 699                                 if (!interpret_string_addr(&ss, sock_tok,
 700                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 701                                         continue;
 702                                 }
 703
 704                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 705                                         return false;
 706                                 }
 707                         }
 708                 }
 709         }
 710
 711         if (parent->sockets == NULL) {
 712                 DEBUG(0,("open_sockets_smbd: No "
 713                         "sockets available to bind to.\n"));
 714                 return false;
 715         }
 716
 717         /* Setup the main smbd so that we can get messages. Note that
 718            do this after starting listening. This is needed as when in
 719            clustered mode, ctdb won't allow us to start doing database
 720            operations until it has gone thru a full startup, which
 721            includes checking to see that smbd is listening. */
 722
 723         if (!serverid_register(procid_self(),
 724                                FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 725                                |FLAG_MSG_DBWRAP)) {
 726                 DEBUG(0, ("open_sockets_smbd: Failed to register "
 727                           "myself in serverid.tdb\n"));
 728                 return false;
 729         }
 730
 731         if (!(event_add_idle(server_event_context(), NULL,
 732                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
 733                              "parent_housekeeping", smbd_parent_housekeeping,
 734                              NULL))) {
 735                 DEBUG(0, ("Could not add parent_housekeeping event\n"));
 736                 return false;
 737         }
 738
 739         /* Listen to messages */
 740
 741         messaging_register(msg_ctx, NULL, MSG_SMB_SAM_SYNC, msg_sam_sync);
 742         messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
 743         messaging_register(msg_ctx, NULL, MSG_SMB_FILE_RENAME,
 744                            msg_file_was_renamed);
 745         messaging_register(msg_ctx, server_event_context(), MSG_SMB_CONF_UPDATED,
 746                            smb_conf_updated);
 747         messaging_register(msg_ctx, NULL, MSG_SMB_STAT_CACHE_DELETE,
 748                            smb_stat_cache_delete);
 749         messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
 750         messaging_register(msg_ctx, server_event_context(), MSG_PRINTER_PCAP,
 751                            smb_pcap_updated);
 752         brl_register_msgs(msg_ctx);
 753
 754         msg_idmap_register_msgs(msg_ctx);
 755
 756 #ifdef CLUSTER_SUPPORT
 757         if (lp_clustering()) {
 758                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 759         }
 760 #endif
 761
 762 #ifdef DEVELOPER
 763         messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
 764                            msg_inject_fault);
 765 #endif
 766
 767         if (lp_multicast_dns_register() && (dns_port != 0)) {
 768 #ifdef WITH_DNSSD_SUPPORT
 769                 smbd_setup_mdns_registration(server_event_context(),
 770                                              parent, dns_port);
 771 #endif
 772 #ifdef WITH_AVAHI_SUPPORT
 773                 void *avahi_conn;
 774
 775                 avahi_conn = avahi_start_register(
 776                         server_event_context(), server_event_context(), dns_port);
 777                 if (avahi_conn == NULL) {
 778                         DEBUG(10, ("avahi_start_register failed\n"));
 779                 }
 780 #endif
 781         }
 782
 783         return true;
 784 }
 785
 786 static void smbd_parent_loop(struct smbd_parent_context *parent)
 787 {
 788         /* now accept incoming connections - forking a new process
 789            for each incoming connection */
 790         DEBUG(2,("waiting for connections\n"));
 791         while (1) {
 792                 int ret;
 793                 TALLOC_CTX *frame = talloc_stackframe();
 794
 795                 ret = tevent_loop_once(server_event_context());
 796                 if (ret != 0) {
 797                         exit_server_cleanly("tevent_loop_once() error");
 798                 }
 799
 800                 TALLOC_FREE(frame);
 801         } /* end while 1 */
 802
 803 /* NOTREACHED   return True; */
 804 }
 805
 806
 807 /****************************************************************************
 808  Initialise connect, service and file structs.
 809 ****************************************************************************/
 810
 811 static bool init_structs(void )
 812 {
 813         /*
 814          * Set the machine NETBIOS name if not already
 815          * set from the config file.
 816          */
 817
 818         if (!init_names())
 819                 return False;
 820
 821         if (!secrets_init())
 822                 return False;
 823
 824         return True;
 825 }
 826
 827 /****************************************************************************
 828  main program.
 829 ****************************************************************************/
 830
 831 /* Declare prototype for build_options() to avoid having to run it through
 832    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 833    prototype generation system is too complicated. */
 834
 835 extern void build_options(bool screen);
 836
 837  int main(int argc,const char *argv[])
 838 {
 839         /* shall I run as a daemon */
 840         bool is_daemon = false;
 841         bool interactive = false;
 842         bool Fork = true;
 843         bool no_process_group = false;
 844         bool log_stdout = false;
 845         char *ports = NULL;
 846         char *profile_level = NULL;
 847         int opt;
 848         poptContext pc;
 849         bool print_build_options = False;
 850         enum {
 851                 OPT_DAEMON = 1000,
 852                 OPT_INTERACTIVE,
 853                 OPT_FORK,
 854                 OPT_NO_PROCESS_GROUP,
 855                 OPT_LOG_STDOUT
 856         };
 857         struct poptOption long_options[] = {
 858         POPT_AUTOHELP
 859         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 860         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 861         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 862         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 863         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 864         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 865         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 866         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 867         POPT_COMMON_SAMBA
 868         POPT_COMMON_DYNCONFIG
 869         POPT_TABLEEND
 870         };
 871         struct smbd_parent_context *parent = NULL;
 872         TALLOC_CTX *frame;
 873         NTSTATUS status;
 874         uint64_t unique_id;
 875
 876         /*
 877          * Do this before any other talloc operation
 878          */
 879         talloc_enable_null_tracking();
 880         frame = talloc_stackframe();
 881
 882         load_case_tables();
 883
 884         /* Initialize the event context, it will panic on error */
 885         server_event_context();
 886
 887         smbd_init_globals();
 888
 889         TimeInit();
 890
 891 #ifdef HAVE_SET_AUTH_PARAMETERS
 892         set_auth_parameters(argc,argv);
 893 #endif
 894
 895         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 896         while((opt = poptGetNextOpt(pc)) != -1) {
 897                 switch (opt)  {
 898                 case OPT_DAEMON:
 899                         is_daemon = true;
 900                         break;
 901                 case OPT_INTERACTIVE:
 902                         interactive = true;
 903                         break;
 904                 case OPT_FORK:
 905                         Fork = false;
 906                         break;
 907                 case OPT_NO_PROCESS_GROUP:
 908                         no_process_group = true;
 909                         break;
 910                 case OPT_LOG_STDOUT:
 911                         log_stdout = true;
 912                         break;
 913                 case 'b':
 914                         print_build_options = True;
 915                         break;
 916                 default:
 917                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 918                                   poptBadOption(pc, 0), poptStrerror(opt));
 919                         poptPrintUsage(pc, stderr, 0);
 920                         exit(1);
 921                 }
 922         }
 923         poptFreeContext(pc);
 924
 925         if (interactive) {
 926                 Fork = False;
 927                 log_stdout = True;
 928         }
 929
 930         if (log_stdout) {
 931                 setup_logging(argv[0], DEBUG_STDOUT);
 932         } else {
 933                 setup_logging(argv[0], DEBUG_FILE);
 934         }
 935
 936         if (print_build_options) {
 937                 build_options(True); /* Display output to screen as well as debug */
 938                 exit(0);
 939         }
 940
 941 #ifdef HAVE_SETLUID
 942         /* needed for SecureWare on SCO */
 943         setluid(0);
 944 #endif
 945
 946         set_remote_machine_name("smbd", False);
 947
 948         if (interactive && (DEBUGLEVEL >= 9)) {
 949                 talloc_enable_leak_report();
 950         }
 951
 952         if (log_stdout && Fork) {
 953                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 954                 exit(1);
 955         }
 956
 957         /* we want to re-seed early to prevent time delays causing
 958            client problems at a later date. (tridge) */
 959         generate_random_buffer(NULL, 0);
 960
 961         /* get initial effective uid and gid */
 962         sec_init();
 963
 964         /* make absolutely sure we run as root - to handle cases where people
 965            are crazy enough to have it setuid */
 966         gain_root_privilege();
 967         gain_root_group_privilege();
 968
 969         fault_setup();
 970         dump_core_setup("smbd", lp_logfile());
 971
 972         /* we are never interested in SIGPIPE */
 973         BlockSignals(True,SIGPIPE);
 974
 975 #if defined(SIGFPE)
 976         /* we are never interested in SIGFPE */
 977         BlockSignals(True,SIGFPE);
 978 #endif
 979
 980 #if defined(SIGUSR2)
 981         /* We are no longer interested in USR2 */
 982         BlockSignals(True,SIGUSR2);
 983 #endif
 984
 985         /* POSIX demands that signals are inherited. If the invoking process has
 986          * these signals masked, we will have problems, as we won't recieve them. */
 987         BlockSignals(False, SIGHUP);
 988         BlockSignals(False, SIGUSR1);
 989         BlockSignals(False, SIGTERM);
 990
 991         /* Ensure we leave no zombies until we
 992          * correctly set up child handling below. */
 993
 994         CatchChild();
 995
 996         /* we want total control over the permissions on created files,
 997            so set our umask to 0 */
 998         umask(0);
 999
1000         reopen_logs();
1001
1002         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1003         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1004
1005         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1006                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1007
1008         /* Output the build options to the debug log */
1009         build_options(False);
1010
1011         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1012                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1013                 exit(1);
1014         }
1015
1016         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1017                 DEBUG(0, ("error opening config file '%s'\n", get_dyn_CONFIGFILE()));
1018                 exit(1);
1019         }
1020
1021         /* Init the security context and global current_user */
1022         init_sec_ctx();
1023
1024         if (smbd_messaging_context() == NULL)
1025                 exit(1);
1026
1027         /*
1028          * Reloading of the printers will not work here as we don't have a
1029          * server info and rpc services set up. It will be called later.
1030          */
1031         if (!reload_services(NULL, -1, False)) {
1032                 exit(1);
1033         }
1034
1035         /* ...NOTE... Log files are working from this point! */
1036
1037         DEBUG(3,("loaded services\n"));
1038
1039         init_structs();
1040
1041 #ifdef WITH_PROFILE
1042         if (!profile_setup(smbd_messaging_context(), False)) {
1043                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1044                 return -1;
1045         }
1046         if (profile_level != NULL) {
1047                 int pl = atoi(profile_level);
1048                 struct server_id src;
1049
1050                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1051                 src.pid = getpid();
1052                 set_profile_level(pl, src);
1053         }
1054 #endif
1055
1056         if (!is_daemon && !is_a_socket(0)) {
1057                 if (!interactive)
1058                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1059
1060                 /*
1061                  * Setting is_daemon here prevents us from eventually calling
1062                  * the open_sockets_inetd()
1063                  */
1064
1065                 is_daemon = True;
1066         }
1067
1068         if (is_daemon && !interactive) {
1069                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1070                 become_daemon(Fork, no_process_group, log_stdout);
1071         }
1072
1073         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
1074         set_my_unique_id(unique_id);
1075
1076 #if HAVE_SETPGID
1077         /*
1078          * If we're interactive we want to set our own process group for
1079          * signal management.
1080          */
1081         if (interactive && !no_process_group)
1082                 setpgid( (pid_t)0, (pid_t)0);
1083 #endif
1084
1085         if (!directory_exist(lp_lockdir()))
1086                 mkdir(lp_lockdir(), 0755);
1087
1088         if (is_daemon)
1089                 pidfile_create("smbd");
1090
1091         status = reinit_after_fork(smbd_messaging_context(),
1092                                    server_event_context(),
1093                                    procid_self(), false);
1094         if (!NT_STATUS_IS_OK(status)) {
1095                 DEBUG(0,("reinit_after_fork() failed\n"));
1096                 exit(1);
1097         }
1098
1099         smbd_server_conn->msg_ctx = smbd_messaging_context();
1100
1101         smbd_setup_sig_term_handler();
1102         smbd_setup_sig_hup_handler(server_event_context(),
1103                                    smbd_server_conn->msg_ctx);
1104
1105         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1106
1107         if (smbd_memcache() == NULL) {
1108                 exit(1);
1109         }
1110
1111         memcache_set_global(smbd_memcache());
1112
1113         /* Initialise the password backed before the global_sam_sid
1114            to ensure that we fetch from ldap before we make a domain sid up */
1115
1116         if(!initialize_password_db(False, server_event_context()))
1117                 exit(1);
1118
1119         if (!secrets_init()) {
1120                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1121                 exit(1);
1122         }
1123
1124         if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC) {
1125                 if (!open_schannel_session_store(NULL, lp_private_dir())) {
1126                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
1127                         exit(1);
1128                 }
1129         }
1130
1131         if(!get_global_sam_sid()) {
1132                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1133                 exit(1);
1134         }
1135
1136         if (!sessionid_init()) {
1137                 exit(1);
1138         }
1139
1140         if (!connections_init(True))
1141                 exit(1);
1142
1143         if (!locking_init())
1144                 exit(1);
1145
1146         if (!messaging_tdb_parent_init(server_event_context())) {
1147                 exit(1);
1148         }
1149
1150         if (!notify_internal_parent_init(server_event_context())) {
1151                 exit(1);
1152         }
1153
1154         if (!serverid_parent_init(server_event_context())) {
1155                 exit(1);
1156         }
1157
1158         if (!printer_list_parent_init()) {
1159                 exit(1);
1160         }
1161
1162         if (!W_ERROR_IS_OK(registry_init_full()))
1163                 exit(1);
1164
1165         if (!print_backend_init(smbd_messaging_context()))
1166                 exit(1);
1167
1168         /* Open the share_info.tdb here, so we don't have to open
1169            after the fork on every single connection.  This is a small
1170            performance improvment and reduces the total number of system
1171            fds used. */
1172         if (!share_info_db_init()) {
1173                 DEBUG(0,("ERROR: failed to load share info db.\n"));
1174                 exit(1);
1175         }
1176
1177         status = init_system_info();
1178         if (!NT_STATUS_IS_OK(status)) {
1179                 DEBUG(1, ("ERROR: failed to setup system user info: %s.\n",
1180                           nt_errstr(status)));
1181                 return -1;
1182         }
1183
1184         if (!init_guest_info()) {
1185                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1186                 return -1;
1187         }
1188
1189         if (!file_init(smbd_server_conn)) {
1190                 DEBUG(0, ("ERROR: file_init failed\n"));
1191                 return -1;
1192         }
1193
1194         if (is_daemon && !interactive) {
1195                 const char *rpcsrv_type;
1196
1197                 rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
1198                                                    "rpc_server", "epmapper",
1199                                                    "none");
1200                 if (strcasecmp_m(rpcsrv_type, "daemon") == 0) {
1201                         start_epmd(server_event_context(),
1202                                    smbd_server_conn->msg_ctx);
1203                 }
1204         }
1205
1206         if (!dcesrv_ep_setup(server_event_context(), smbd_server_conn->msg_ctx)) {
1207                 exit(1);
1208         }
1209
1210         /* Publish nt printers, this requires a working winreg pipe */
1211         pcap_cache_reload(server_event_context(), smbd_messaging_context(),
1212                           &reload_printers);
1213
1214         /* only start the background queue daemon if we are
1215            running as a daemon -- bad things will happen if
1216            smbd is launched via inetd and we fork a copy of
1217            ourselves here */
1218
1219         if (is_daemon && !interactive
1220             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1221                 start_background_queue(server_event_context(),
1222                                        smbd_messaging_context());
1223         }
1224
1225         if (is_daemon && !_lp_disable_spoolss()) {
1226                 const char *rpcsrv_type;
1227
1228                 /* start spoolss daemon */
1229                 /* start as a separate daemon only if enabled */
1230                 rpcsrv_type = lp_parm_const_string(GLOBAL_SECTION_SNUM,
1231                                                    "rpc_server", "spoolss",
1232                                                    "embedded");
1233                 if (strcasecmp_m(rpcsrv_type, "daemon") == 0) {
1234                         start_spoolssd(server_event_context(),
1235                                        smbd_messaging_context());
1236                 }
1237         }
1238
1239         if (!is_daemon) {
1240                 /* inetd mode */
1241                 TALLOC_FREE(frame);
1242
1243                 /* Started from inetd. fd 0 is the socket. */
1244                 /* We will abort gracefully when the client or remote system
1245                    goes away */
1246                 smbd_set_server_fd(dup(0));
1247
1248                 /* close our standard file descriptors */
1249                 close_low_fds(False); /* Don't close stderr */
1250
1251 #ifdef HAVE_ATEXIT
1252                 atexit(killkids);
1253 #endif
1254
1255                 /* Stop zombies */
1256                 smbd_setup_sig_chld_handler();
1257
1258                 smbd_process(smbd_server_conn);
1259
1260                 exit_server_cleanly(NULL);
1261                 return(0);
1262         }
1263
1264         parent = talloc_zero(server_event_context(), struct smbd_parent_context);
1265         if (!parent) {
1266                 exit_server("talloc(struct smbd_parent_context) failed");
1267         }
1268         parent->interactive = interactive;
1269
1270         if (!open_sockets_smbd(parent, smbd_messaging_context(), ports))
1271                 exit_server("open_sockets_smbd() failed");
1272
1273         TALLOC_FREE(frame);
1274         /* make sure we always have a valid stackframe */
1275         frame = talloc_stackframe();
1276
1277         smbd_parent_loop(parent);
1278
1279         exit_server_cleanly(NULL);
1280         TALLOC_FREE(frame);
1281         return(0);
1282 }