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) James Peach                    2007
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 static_decl_rpc;
  27
  28 static int am_parent = 1;
  29
  30 /* the last message the was processed */
  31 int last_message = -1;
  32
  33 /* a useful macro to debug the last message processed */
  34 #define LAST_MESSAGE() smb_fn_name(last_message)
  35
  36 extern struct auth_context *negprot_global_auth_context;
  37 extern pstring user_socket_options;
  38 extern SIG_ATOMIC_T got_sig_term;
  39 extern SIG_ATOMIC_T reload_after_sighup;
  40 static SIG_ATOMIC_T got_sig_cld;
  41
  42 #ifdef WITH_DFS
  43 extern int dcelogin_atmost_once;
  44 #endif /* WITH_DFS */
  45
  46 /* really we should have a top level context structure that has the
  47    client file descriptor as an element. That would require a major rewrite :(
  48
  49    the following 2 functions are an alternative - they make the file
  50    descriptor private to smbd
  51  */
  52 static int server_fd = -1;
  53
  54 int smbd_server_fd(void)
  55 {
  56         return server_fd;
  57 }
  58
  59 static void smbd_set_server_fd(int fd)
  60 {
  61         server_fd = fd;
  62         client_setfd(fd);
  63 }
  64
  65 struct event_context *smbd_event_context(void)
  66 {
  67         static struct event_context *ctx;
  68
  69         if (!ctx && !(ctx = event_context_init(NULL))) {
  70                 smb_panic("Could not init smbd event context\n");
  71         }
  72         return ctx;
  73 }
  74
  75 struct messaging_context *smbd_messaging_context(void)
  76 {
  77         static struct messaging_context *ctx;
  78
  79         if (!ctx && !(ctx = messaging_init(NULL, server_id_self(),
  80                                            smbd_event_context()))) {
  81                 smb_panic("Could not init smbd messaging context\n");
  82         }
  83         return ctx;
  84 }
  85
  86 /*******************************************************************
  87  What to do when smb.conf is updated.
  88  ********************************************************************/
  89
  90 static void smb_conf_updated(struct messaging_context *msg,
  91                              void *private_data,
  92                              uint32_t msg_type,
  93                              struct server_id server_id,
  94                              DATA_BLOB *data)
  95 {
  96         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
  97                   "updated. Reloading.\n"));
  98         reload_services(False);
  99 }
 100
 101
 102 /*******************************************************************
 103  Delete a statcache entry.
 104  ********************************************************************/
 105
 106 static void smb_stat_cache_delete(struct messaging_context *msg,
 107                                   void *private_data,
 108                                   uint32_t msg_tnype,
 109                                   struct server_id server_id,
 110                                   DATA_BLOB *data)
 111 {
 112         const char *name = (const char *)data->data;
 113         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 114         stat_cache_delete(name);
 115 }
 116
 117 /****************************************************************************
 118  Terminate signal.
 119 ****************************************************************************/
 120
 121 static void sig_term(void)
 122 {
 123         got_sig_term = 1;
 124         sys_select_signal(SIGTERM);
 125 }
 126
 127 /****************************************************************************
 128  Catch a sighup.
 129 ****************************************************************************/
 130
 131 static void sig_hup(int sig)
 132 {
 133         reload_after_sighup = 1;
 134         sys_select_signal(SIGHUP);
 135 }
 136
 137 /****************************************************************************
 138  Catch a sigcld
 139 ****************************************************************************/
 140 static void sig_cld(int sig)
 141 {
 142         got_sig_cld = 1;
 143         sys_select_signal(SIGCLD);
 144 }
 145
 146 /****************************************************************************
 147   Send a SIGTERM to our process group.
 148 *****************************************************************************/
 149
 150 static void  killkids(void)
 151 {
 152         if(am_parent) kill(0,SIGTERM);
 153 }
 154
 155 /****************************************************************************
 156  Process a sam sync message - not sure whether to do this here or
 157  somewhere else.
 158 ****************************************************************************/
 159
 160 static void msg_sam_sync(struct messaging_context *msg,
 161                          void *private_data,
 162                          uint32_t msg_type,
 163                          struct server_id server_id,
 164                          DATA_BLOB *data)
 165 {
 166         DEBUG(10, ("** sam sync message received, ignoring\n"));
 167 }
 168
 169 /****************************************************************************
 170  Process a sam sync replicate message - not sure whether to do this here or
 171  somewhere else.
 172 ****************************************************************************/
 173
 174 static void msg_sam_repl(struct messaging_context *msg,
 175                          void *private_data,
 176                          uint32_t msg_type,
 177                          struct server_id server_id,
 178                          DATA_BLOB *data)
 179 {
 180         uint32 low_serial;
 181
 182         if (data->length != sizeof(low_serial))
 183                 return;
 184
 185         low_serial = *((uint32 *)data->data);
 186
 187         DEBUG(3, ("received sam replication message, serial = 0x%04x\n",
 188                   low_serial));
 189 }
 190
 191 /****************************************************************************
 192  Open the socket communication - inetd.
 193 ****************************************************************************/
 194
 195 static BOOL open_sockets_inetd(void)
 196 {
 197         /* Started from inetd. fd 0 is the socket. */
 198         /* We will abort gracefully when the client or remote system
 199            goes away */
 200         smbd_set_server_fd(dup(0));
 201
 202         /* close our standard file descriptors */
 203         close_low_fds(False); /* Don't close stderr */
 204
 205         set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 206         set_socket_options(smbd_server_fd(), user_socket_options);
 207
 208         return True;
 209 }
 210
 211 static void msg_exit_server(struct messaging_context *msg,
 212                             void *private_data,
 213                             uint32_t msg_type,
 214                             struct server_id server_id,
 215                             DATA_BLOB *data)
 216 {
 217         DEBUG(3, ("got a SHUTDOWN message\n"));
 218         exit_server_cleanly(NULL);
 219 }
 220
 221 #ifdef DEVELOPER
 222 static void msg_inject_fault(struct messaging_context *msg,
 223                              void *private_data,
 224                              uint32_t msg_type,
 225                              struct server_id src,
 226                              DATA_BLOB *data)
 227 {
 228         int sig;
 229
 230         if (data->length != sizeof(sig)) {
 231
 232                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 233                           procid_str_static(&src)));
 234                 return;
 235         }
 236
 237         sig = *(int *)data->data;
 238         if (sig == -1) {
 239                 exit_server("internal error injected");
 240                 return;
 241         }
 242
 243 #if HAVE_STRSIGNAL
 244         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 245                   procid_str_static(&src), sig, strsignal(sig)));
 246 #else
 247         DEBUG(0, ("Process %s requested injection of signal %d\n",
 248                   procid_str_static(&src), sig));
 249 #endif
 250
 251         kill(sys_getpid(), sig);
 252 }
 253 #endif /* DEVELOPER */
 254
 255 struct child_pid {
 256         struct child_pid *prev, *next;
 257         pid_t pid;
 258 };
 259
 260 static struct child_pid *children;
 261 static int num_children;
 262
 263 static void add_child_pid(pid_t pid)
 264 {
 265         struct child_pid *child;
 266
 267         if (lp_max_smbd_processes() == 0) {
 268                 /* Don't bother with the child list if we don't care anyway */
 269                 return;
 270         }
 271
 272         child = SMB_MALLOC_P(struct child_pid);
 273         if (child == NULL) {
 274                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 275                 return;
 276         }
 277         child->pid = pid;
 278         DLIST_ADD(children, child);
 279         num_children += 1;
 280 }
 281
 282 static void remove_child_pid(pid_t pid)
 283 {
 284         struct child_pid *child;
 285
 286         if (lp_max_smbd_processes() == 0) {
 287                 /* Don't bother with the child list if we don't care anyway */
 288                 return;
 289         }
 290
 291         for (child = children; child != NULL; child = child->next) {
 292                 if (child->pid == pid) {
 293                         struct child_pid *tmp = child;
 294                         DLIST_REMOVE(children, child);
 295                         SAFE_FREE(tmp);
 296                         num_children -= 1;
 297                         return;
 298                 }
 299         }
 300
 301         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 302 }
 303
 304 /****************************************************************************
 305  Have we reached the process limit ?
 306 ****************************************************************************/
 307
 308 static BOOL allowable_number_of_smbd_processes(void)
 309 {
 310         int max_processes = lp_max_smbd_processes();
 311
 312         if (!max_processes)
 313                 return True;
 314
 315         return num_children < max_processes;
 316 }
 317
 318 /****************************************************************************
 319  Are we idle enough that we could safely exit?
 320 ****************************************************************************/
 321
 322 static BOOL smbd_is_idle(void)
 323 {
 324         /* Currently we define "idle" as having no client connections. */
 325         return count_all_current_connections() == 0;
 326 }
 327
 328 /****************************************************************************
 329  Open the socket communication.
 330 ****************************************************************************/
 331
 332 static BOOL open_sockets_smbd(enum smb_server_mode server_mode, const char *smb_ports)
 333 {
 334         int num_sockets = 0;
 335         int fd_listenset[FD_SETSIZE];
 336         fd_set listen_set;
 337         int s;
 338         int maxfd = 0;
 339         int i;
 340         struct timeval idle_timeout = timeval_zero();
 341
 342         if (server_mode == SERVER_MODE_INETD) {
 343                 return open_sockets_inetd();
 344         }
 345
 346 #ifdef HAVE_ATEXIT
 347         {
 348                 static int atexit_set;
 349                 if(atexit_set == 0) {
 350                         atexit_set=1;
 351                         atexit(killkids);
 352                 }
 353         }
 354 #endif
 355
 356         /* Stop zombies */
 357         CatchSignal(SIGCLD, sig_cld);
 358
 359         FD_ZERO(&listen_set);
 360
 361         /* At this point, it doesn't matter what daemon mode we are in, we
 362          * need some sockets to listen on.
 363          */
 364         num_sockets = smbd_sockinit(smb_ports, fd_listenset, &idle_timeout);
 365         if (num_sockets == 0) {
 366                 return False;
 367         }
 368
 369         for (i = 0; i < num_sockets; ++i) {
 370                 FD_SET(fd_listenset[i], &listen_set);
 371                 maxfd = MAX(maxfd, fd_listenset[i]);
 372         }
 373
 374         /* Listen to messages */
 375
 376         messaging_register(smbd_messaging_context(), NULL,
 377                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 378         messaging_register(smbd_messaging_context(), NULL,
 379                            MSG_SMB_SAM_REPL, msg_sam_repl);
 380         messaging_register(smbd_messaging_context(), NULL,
 381                            MSG_SHUTDOWN, msg_exit_server);
 382         messaging_register(smbd_messaging_context(), NULL,
 383                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 384         messaging_register(smbd_messaging_context(), NULL,
 385                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 386         messaging_register(smbd_messaging_context(), NULL,
 387                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 388         brl_register_msgs(smbd_messaging_context());
 389
 390 #ifdef DEVELOPER
 391         messaging_register(smbd_messaging_context(), NULL,
 392                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 393 #endif
 394
 395         /* now accept incoming connections - forking a new process
 396            for each incoming connection */
 397         DEBUG(2,("waiting for a connection\n"));
 398         while (1) {
 399                 struct timeval now;
 400                 fd_set r_fds, w_fds;
 401                 int num;
 402
 403                 /* Free up temporary memory from the main smbd. */
 404                 lp_TALLOC_FREE();
 405
 406                 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
 407                 message_dispatch(smbd_messaging_context());
 408
 409                 if (got_sig_cld) {
 410                         pid_t pid;
 411                         got_sig_cld = False;
 412
 413                         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 414                                 remove_child_pid(pid);
 415                         }
 416                 }
 417
 418                 memcpy((char *)&r_fds, (char *)&listen_set,
 419                        sizeof(listen_set));
 420                 FD_ZERO(&w_fds);
 421                 GetTimeOfDay(&now);
 422
 423                 event_add_to_select_args(smbd_event_context(), &now,
 424                                          &r_fds, &w_fds, &idle_timeout,
 425                                          &maxfd);
 426
 427                 if (timeval_is_zero(&idle_timeout)) {
 428                         num = sys_select(maxfd + 1, &r_fds, &w_fds,
 429                                         NULL, NULL);
 430                 } else {
 431                         num = sys_select(maxfd + 1, &r_fds, &w_fds,
 432                                         NULL, &idle_timeout);
 433
 434                         /* If the idle timeout fired and we are idle, exit
 435                          * gracefully. We expect to be running under a process
 436                          * controller that will restart us if necessry.
 437                          */
 438                         if (num == 0 && smbd_is_idle()) {
 439                                 exit_server_cleanly("idle timeout");
 440                         }
 441                 }
 442
 443                 if (num == -1 && errno == EINTR) {
 444                         if (got_sig_term) {
 445                                 exit_server_cleanly(NULL);
 446                         }
 447
 448                         /* check for sighup processing */
 449                         if (reload_after_sighup) {
 450                                 change_to_root_user();
 451                                 DEBUG(1,("Reloading services after SIGHUP\n"));
 452                                 reload_services(False);
 453                                 reload_after_sighup = 0;
 454                         }
 455
 456                         continue;
 457                 }
 458
 459                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 460                         continue;
 461                 }
 462
 463                 /* check if we need to reload services */
 464                 check_reload(time(NULL));
 465
 466                 /* Find the sockets that are read-ready -
 467                    accept on these. */
 468                 for( ; num > 0; num--) {
 469                         struct sockaddr addr;
 470                         socklen_t in_addrlen = sizeof(addr);
 471                         pid_t child = 0;
 472
 473                         s = -1;
 474                         for(i = 0; i < num_sockets; i++) {
 475                                 if(FD_ISSET(fd_listenset[i],&r_fds)) {
 476                                         s = fd_listenset[i];
 477                                         /* Clear this so we don't look
 478                                            at it again. */
 479                                         FD_CLR(fd_listenset[i],&r_fds);
 480                                         break;
 481                                 }
 482                         }
 483
 484                         smbd_set_server_fd(accept(s,&addr,&in_addrlen));
 485
 486                         if (smbd_server_fd() == -1 && errno == EINTR)
 487                                 continue;
 488
 489                         if (smbd_server_fd() == -1) {
 490                                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 491                                          strerror(errno)));
 492                                 continue;
 493                         }
 494
 495                         /* Ensure child is set to blocking mode */
 496                         set_blocking(smbd_server_fd(),True);
 497
 498                         /* In interactive mode, return with a connected socket.
 499                          * Foreground and daemon modes should fork worker
 500                          * processes.
 501                          */
 502                         if (server_mode == SERVER_MODE_INTERACTIVE) {
 503                                 return True;
 504                         }
 505
 506                         if (allowable_number_of_smbd_processes() &&
 507                             smbd_server_fd() != -1 &&
 508                             ((child = sys_fork())==0)) {
 509                                 /* Child code ... */
 510
 511                                 /* Stop zombies, the parent explicitly handles
 512                                  * them, counting worker smbds. */
 513                                 CatchChild();
 514
 515                                 /* close the listening socket(s) */
 516                                 for(i = 0; i < num_sockets; i++)
 517                                         close(fd_listenset[i]);
 518
 519                                 /* close our standard file
 520                                    descriptors */
 521                                 close_low_fds(False);
 522                                 am_parent = 0;
 523
 524                                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 525                                 set_socket_options(smbd_server_fd(),user_socket_options);
 526
 527                                 /* this is needed so that we get decent entries
 528                                    in smbstatus for port 445 connects */
 529                                 set_remote_machine_name(get_peer_addr(smbd_server_fd()),
 530                                                         False);
 531
 532                                 /* Reset the state of the random
 533                                  * number generation system, so
 534                                  * children do not get the same random
 535                                  * numbers as each other */
 536
 537                                 set_need_random_reseed();
 538                                 /* tdb needs special fork handling - remove
 539                                  * CLEAR_IF_FIRST flags */
 540                                 if (tdb_reopen_all(1) == -1) {
 541                                         DEBUG(0,("tdb_reopen_all failed.\n"));
 542                                         smb_panic("tdb_reopen_all failed.");
 543                                 }
 544
 545                                 return True;
 546                         }
 547                         /* The parent doesn't need this socket */
 548                         close(smbd_server_fd());
 549
 550                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 551                                 Clear the closed fd info out of server_fd --
 552                                 and more importantly, out of client_fd in
 553                                 util_sock.c, to avoid a possible
 554                                 getpeername failure if we reopen the logs
 555                                 and use %I in the filename.
 556                         */
 557
 558                         smbd_set_server_fd(-1);
 559
 560                         if (child != 0) {
 561                                 add_child_pid(child);
 562                         }
 563
 564                         /* Force parent to check log size after
 565                          * spawning child.  Fix from
 566                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 567                          * parent smbd will log to logserver.smb.  It
 568                          * writes only two messages for each child
 569                          * started/finished. But each child writes,
 570                          * say, 50 messages also in logserver.smb,
 571                          * begining with the debug_count of the
 572                          * parent, before the child opens its own log
 573                          * file logserver.client. In a worst case
 574                          * scenario the size of logserver.smb would be
 575                          * checked after about 50*50=2500 messages
 576                          * (ca. 100kb).
 577                          * */
 578                         force_check_log_size();
 579
 580                 } /* end for num */
 581         } /* end while 1 */
 582
 583 /* NOTREACHED   return True; */
 584 }
 585
 586 /****************************************************************************
 587  Reload printers
 588 **************************************************************************/
 589 void reload_printers(void)
 590 {
 591         int snum;
 592         int n_services = lp_numservices();
 593         int pnum = lp_servicenumber(PRINTERS_NAME);
 594         const char *pname;
 595
 596         pcap_cache_reload();
 597
 598         /* remove stale printers */
 599         for (snum = 0; snum < n_services; snum++) {
 600                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 601                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 602                                       lp_autoloaded(snum)))
 603                         continue;
 604
 605                 pname = lp_printername(snum);
 606                 if (!pcap_printername_ok(pname)) {
 607                         DEBUG(3, ("removing stale printer %s\n", pname));
 608
 609                         if (is_printer_published(NULL, snum, NULL))
 610                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 611                         del_a_printer(pname);
 612                         lp_killservice(snum);
 613                 }
 614         }
 615
 616         load_printers();
 617 }
 618
 619 /****************************************************************************
 620  Reload the services file.
 621 **************************************************************************/
 622
 623 BOOL reload_services(BOOL test)
 624 {
 625         BOOL ret;
 626
 627         if (lp_loaded()) {
 628                 pstring fname;
 629                 pstrcpy(fname,lp_configfile());
 630                 if (file_exist(fname, NULL) &&
 631                     !strcsequal(fname, dyn_CONFIGFILE)) {
 632                         pstrcpy(dyn_CONFIGFILE, fname);
 633                         test = False;
 634                 }
 635         }
 636
 637         reopen_logs();
 638
 639         if (test && !lp_file_list_changed())
 640                 return(True);
 641
 642         lp_killunused(conn_snum_used);
 643
 644         ret = lp_load(dyn_CONFIGFILE, False, False, True, True);
 645
 646         reload_printers();
 647
 648         /* perhaps the config filename is now set */
 649         if (!test)
 650                 reload_services(True);
 651
 652         reopen_logs();
 653
 654         load_interfaces();
 655
 656         if (smbd_server_fd() != -1) {
 657                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 658                 set_socket_options(smbd_server_fd(), user_socket_options);
 659         }
 660
 661         mangle_reset_cache();
 662         reset_stat_cache();
 663
 664         /* this forces service parameters to be flushed */
 665         set_current_service(NULL,0,True);
 666
 667         return(ret);
 668 }
 669
 670 /****************************************************************************
 671  Exit the server.
 672 ****************************************************************************/
 673
 674 /* Reasons for shutting down a server process. */
 675 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 676
 677 static void exit_server_common(enum server_exit_reason how,
 678         const char *const reason) NORETURN_ATTRIBUTE;
 679
 680 static void exit_server_common(enum server_exit_reason how,
 681         const char *const reason)
 682 {
 683         static int firsttime=1;
 684
 685         if (!firsttime)
 686                 exit(0);
 687         firsttime = 0;
 688
 689         change_to_root_user();
 690
 691         if (negprot_global_auth_context) {
 692                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 693         }
 694
 695         conn_close_all();
 696
 697         invalidate_all_vuids();
 698
 699         /* 3 second timeout. */
 700         print_notify_send_messages(smbd_messaging_context(), 3);
 701
 702         /* delete our entry in the connections database. */
 703         yield_connection(NULL,"");
 704
 705         respond_to_all_remaining_local_messages();
 706
 707 #ifdef WITH_DFS
 708         if (dcelogin_atmost_once) {
 709                 dfs_unlogin();
 710         }
 711 #endif
 712
 713         locking_end();
 714         printing_end();
 715
 716         server_encryption_shutdown();
 717
 718         if (how != SERVER_EXIT_NORMAL) {
 719                 int oldlevel = DEBUGLEVEL;
 720                 char *last_inbuf = get_InBuffer();
 721
 722                 DEBUGLEVEL = 10;
 723
 724                 DEBUGSEP(0);
 725                 DEBUG(0,("Abnormal server exit: %s\n",
 726                         reason ? reason : "no explanation provided"));
 727                 DEBUGSEP(0);
 728
 729                 log_stack_trace();
 730                 if (last_inbuf) {
 731                         DEBUG(0,("Last message was %s\n", LAST_MESSAGE()));
 732                         show_msg(last_inbuf);
 733                 }
 734
 735                 DEBUGLEVEL = oldlevel;
 736                 dump_core();
 737
 738         } else {
 739                 DEBUG(3,("Server exit (%s)\n",
 740                         (reason ? reason : "normal exit")));
 741         }
 742
 743         exit(0);
 744 }
 745
 746 void exit_server(const char *const explanation)
 747 {
 748         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 749 }
 750
 751 void exit_server_cleanly(const char *const explanation)
 752 {
 753         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 754 }
 755
 756 void exit_server_fault(void)
 757 {
 758         exit_server("critical server fault");
 759 }
 760
 761 /****************************************************************************
 762  Initialise connect, service and file structs.
 763 ****************************************************************************/
 764
 765 static BOOL init_structs(void )
 766 {
 767         /*
 768          * Set the machine NETBIOS name if not already
 769          * set from the config file.
 770          */
 771
 772         if (!init_names())
 773                 return False;
 774
 775         conn_init();
 776
 777         file_init();
 778
 779         /* for RPC pipes */
 780         init_rpc_pipe_hnd();
 781
 782         init_dptrs();
 783
 784         secrets_init();
 785
 786         return True;
 787 }
 788
 789 /*
 790  * Send keepalive packets to our client
 791  */
 792 static BOOL keepalive_fn(const struct timeval *now, void *private_data)
 793 {
 794         if (!send_keepalive(smbd_server_fd())) {
 795                 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
 796                 return False;
 797         }
 798         return True;
 799 }
 800
 801 /*
 802  * Do the recurring check if we're idle
 803  */
 804 static BOOL deadtime_fn(const struct timeval *now, void *private_data)
 805 {
 806         if ((conn_num_open() == 0)
 807             || (conn_idle_all(now->tv_sec))) {
 808                 DEBUG( 2, ( "Closing idle connection\n" ) );
 809                 messaging_send(smbd_messaging_context(), procid_self(),
 810                                MSG_SHUTDOWN, &data_blob_null);
 811                 return False;
 812         }
 813
 814         return True;
 815 }
 816
 817
 818 /****************************************************************************
 819  main program.
 820 ****************************************************************************/
 821
 822 /* Declare prototype for build_options() to avoid having to run it through
 823    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 824    prototype generation system is too complicated. */
 825
 826 extern void build_options(BOOL screen);
 827
 828  int main(int argc,const char *argv[])
 829 {
 830         /* shall I run as a daemon */
 831         BOOL no_process_group = False;
 832         BOOL log_stdout = False;
 833         const char *ports = NULL;
 834         const char *profile_level = NULL;
 835         int opt;
 836         poptContext pc;
 837
 838         enum smb_server_mode server_mode = SERVER_MODE_DAEMON;
 839
 840         struct poptOption long_options[] = {
 841         POPT_AUTOHELP
 842         {"daemon", 'D', POPT_ARG_VAL, &server_mode, SERVER_MODE_DAEMON,
 843                 "Become a daemon (default)" },
 844         {"interactive", 'i', POPT_ARG_VAL, &server_mode, SERVER_MODE_INTERACTIVE,
 845                 "Run interactive (not a daemon)"},
 846         {"foreground", 'F', POPT_ARG_VAL, &server_mode, SERVER_MODE_FOREGROUND,
 847                 "Run daemon in foreground (for daemontools, etc.)" },
 848         {"no-process-group", '\0', POPT_ARG_VAL, &no_process_group, True,
 849                 "Don't create a new process group" },
 850         {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 851         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 852         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 853         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 854         POPT_COMMON_SAMBA
 855         POPT_COMMON_DYNCONFIG
 856         POPT_TABLEEND
 857         };
 858
 859         load_case_tables();
 860
 861         TimeInit();
 862
 863 #ifdef HAVE_SET_AUTH_PARAMETERS
 864         set_auth_parameters(argc,argv);
 865 #endif
 866
 867         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 868
 869         while((opt = poptGetNextOpt(pc)) != -1) {
 870                 switch (opt)  {
 871                 case 'b':
 872                         build_options(True); /* Display output to screen as well as debug */
 873                         exit(0);
 874                         break;
 875                 }
 876         }
 877
 878         poptFreeContext(pc);
 879
 880 #ifdef HAVE_SETLUID
 881         /* needed for SecureWare on SCO */
 882         setluid(0);
 883 #endif
 884
 885         sec_init();
 886
 887         set_remote_machine_name("smbd", False);
 888
 889         if (server_mode == SERVER_MODE_INTERACTIVE) {
 890                 log_stdout = True;
 891                 if (DEBUGLEVEL >= 9) {
 892                         talloc_enable_leak_report();
 893                 }
 894         }
 895
 896         if (log_stdout && server_mode == SERVER_MODE_DAEMON) {
 897                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 898                 exit(1);
 899         }
 900
 901         setup_logging(argv[0],log_stdout);
 902
 903         /* we want to re-seed early to prevent time delays causing
 904            client problems at a later date. (tridge) */
 905         generate_random_buffer(NULL, 0);
 906
 907         /* make absolutely sure we run as root - to handle cases where people
 908            are crazy enough to have it setuid */
 909
 910         gain_root_privilege();
 911         gain_root_group_privilege();
 912
 913         fault_setup((void (*)(void *))exit_server_fault);
 914         dump_core_setup("smbd");
 915
 916         CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
 917         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
 918
 919         /* we are never interested in SIGPIPE */
 920         BlockSignals(True,SIGPIPE);
 921
 922 #if defined(SIGFPE)
 923         /* we are never interested in SIGFPE */
 924         BlockSignals(True,SIGFPE);
 925 #endif
 926
 927 #if defined(SIGUSR2)
 928         /* We are no longer interested in USR2 */
 929         BlockSignals(True,SIGUSR2);
 930 #endif
 931
 932         /* POSIX demands that signals are inherited. If the invoking process has
 933          * these signals masked, we will have problems, as we won't recieve them. */
 934         BlockSignals(False, SIGHUP);
 935         BlockSignals(False, SIGUSR1);
 936         BlockSignals(False, SIGTERM);
 937
 938         /* we want total control over the permissions on created files,
 939            so set our umask to 0 */
 940         umask(0);
 941
 942         init_sec_ctx();
 943
 944         reopen_logs();
 945
 946         DEBUG(0,( "smbd version %s started.\n", SAMBA_VERSION_STRING));
 947         DEBUGADD( 0, ( "%s\n", COPYRIGHT_STARTUP_MESSAGE ) );
 948
 949         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
 950                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
 951
 952         /* Output the build options to the debug log */
 953         build_options(False);
 954
 955         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
 956                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 957                 exit(1);
 958         }
 959
 960         /*
 961          * Do this before reload_services.
 962          */
 963
 964         if (!reload_services(False))
 965                 return(-1);
 966
 967         init_structs();
 968
 969 #ifdef WITH_PROFILE
 970         if (!profile_setup(smbd_messaging_context(), False)) {
 971                 DEBUG(0,("ERROR: failed to setup profiling\n"));
 972                 return -1;
 973         }
 974         if (profile_level != NULL) {
 975                 int pl = atoi(profile_level);
 976                 struct server_id src;
 977
 978                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
 979                 src.pid = getpid();
 980                 set_profile_level(pl, src);
 981         }
 982 #endif
 983
 984         DEBUG(3,( "loaded services\n"));
 985
 986         if (is_a_socket(0)) {
 987                 if (server_mode == SERVER_MODE_DAEMON) {
 988                         DEBUG(0,("standard input is a socket, "
 989                                     "assuming -F option\n"));
 990                 }
 991                 server_mode = SERVER_MODE_INETD;
 992         }
 993
 994         if (server_mode == SERVER_MODE_DAEMON) {
 995                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
 996                 become_daemon(True, no_process_group);
 997         } else if (server_mode == SERVER_MODE_FOREGROUND) {
 998                 become_daemon(False, no_process_group);
 999         }
1000
1001 #if HAVE_SETPGID
1002         /*
1003          * If we're interactive we want to set our own process group for
1004          * signal management.
1005          */
1006         if (server_mode == SERVER_MODE_INTERACTIVE && !no_process_group) {
1007                 setpgid( (pid_t)0, (pid_t)0);
1008         }
1009 #endif
1010
1011         if (!directory_exist(lp_lockdir(), NULL))
1012                 mkdir(lp_lockdir(), 0755);
1013
1014         if (server_mode != SERVER_MODE_INETD &&
1015             server_mode != SERVER_MODE_INTERACTIVE) {
1016                 pidfile_create("smbd");
1017         }
1018
1019         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1020
1021         if (smbd_messaging_context() == NULL)
1022                 exit(1);
1023
1024         /* Initialise the password backed before the global_sam_sid
1025            to ensure that we fetch from ldap before we make a domain sid up */
1026
1027         if(!initialize_password_db(False, smbd_event_context()))
1028                 exit(1);
1029
1030         if (!secrets_init()) {
1031                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1032                 exit(1);
1033         }
1034
1035         if(!get_global_sam_sid()) {
1036                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1037                 exit(1);
1038         }
1039
1040         if (!session_init())
1041                 exit(1);
1042
1043         if (!connections_init(True))
1044                 exit(1);
1045
1046         if (!locking_init(0))
1047                 exit(1);
1048
1049         namecache_enable();
1050
1051         if (!init_registry())
1052                 exit(1);
1053
1054 #if 0
1055         if (!init_svcctl_db())
1056                 exit(1);
1057 #endif
1058
1059         if (!print_backend_init(smbd_messaging_context()))
1060                 exit(1);
1061
1062         if (!init_guest_info()) {
1063                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1064                 return -1;
1065         }
1066
1067         /* Setup the main smbd so that we can get messages. */
1068         /* don't worry about general printing messages here */
1069
1070         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_SMBD);
1071
1072         /* only start the background queue daemon if we are
1073            running as a daemon -- bad things will happen if
1074            smbd is launched via inetd and we fork a copy of
1075            ourselves here */
1076         if (server_mode != SERVER_MODE_INETD &&
1077             server_mode != SERVER_MODE_INTERACTIVE) {
1078                 start_background_queue();
1079         }
1080
1081         /* Always attempt to initialize DMAPI. We will only use it later if
1082          * lp_dmapi_support is set on the share, but we need a single global
1083          * session to work with.
1084          */
1085         dmapi_init_session();
1086
1087         if (!open_sockets_smbd(server_mode, ports)) {
1088                 exit(1);
1089         }
1090
1091         /*
1092          * everything after this point is run after the fork()
1093          */
1094
1095         static_init_rpc;
1096
1097         init_modules();
1098
1099         /* Possibly reload the services file. Only worth doing in
1100          * daemon mode. In inetd mode, we know we only just loaded this.
1101          */
1102         if (server_mode != SERVER_MODE_INETD &&
1103             server_mode != SERVER_MODE_INTERACTIVE) {
1104                 reload_services(True);
1105         }
1106
1107         if (!init_account_policy()) {
1108                 DEBUG(0,("Could not open account policy tdb.\n"));
1109                 exit(1);
1110         }
1111
1112         if (*lp_rootdir()) {
1113                 if (sys_chroot(lp_rootdir()) == 0)
1114                         DEBUG(2,("Changed root to %s\n", lp_rootdir()));
1115         }
1116
1117         /* Setup oplocks */
1118         if (!init_oplocks(smbd_messaging_context()))
1119                 exit(1);
1120
1121         /* Setup aio signal handler. */
1122         initialize_async_io_handler();
1123
1124         /*
1125          * For clustering, we need to re-init our ctdbd connection after the
1126          * fork
1127          */
1128         if (!NT_STATUS_IS_OK(messaging_reinit(smbd_messaging_context())))
1129                 exit(1);
1130
1131         /* register our message handlers */
1132         messaging_register(smbd_messaging_context(), NULL,
1133                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
1134
1135         if ((lp_keepalive() != 0)
1136             && !(event_add_idle(smbd_event_context(), NULL,
1137                                 timeval_set(lp_keepalive(), 0),
1138                                 "keepalive", keepalive_fn,
1139                                 NULL))) {
1140                 DEBUG(0, ("Could not add keepalive event\n"));
1141                 exit(1);
1142         }
1143
1144         if (!(event_add_idle(smbd_event_context(), NULL,
1145                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
1146                              "deadtime", deadtime_fn, NULL))) {
1147                 DEBUG(0, ("Could not add deadtime event\n"));
1148                 exit(1);
1149         }
1150
1151         smbd_process();
1152
1153         namecache_shutdown();
1154
1155         exit_server_cleanly(NULL);
1156         return(0);
1157 }