source/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  Open the socket communication.
 320 ****************************************************************************/
 321
 322 static BOOL open_sockets_smbd(enum smb_server_mode server_mode, const char *smb_ports)
 323 {
 324         int num_sockets = 0;
 325         int fd_listenset[FD_SETSIZE];
 326         fd_set listen_set;
 327         int s;
 328         int maxfd = 0;
 329         int i;
 330         struct timeval idle_timeout = timeval_zero();
 331
 332         if (server_mode == SERVER_MODE_INETD) {
 333                 return open_sockets_inetd();
 334         }
 335
 336 #ifdef HAVE_ATEXIT
 337         {
 338                 static int atexit_set;
 339                 if(atexit_set == 0) {
 340                         atexit_set=1;
 341                         atexit(killkids);
 342                 }
 343         }
 344 #endif
 345
 346         /* Stop zombies */
 347         CatchSignal(SIGCLD, sig_cld);
 348
 349         FD_ZERO(&listen_set);
 350
 351         /* At this point, it doesn't matter what daemon mode we are in, we
 352          * need some sockets to listen on.
 353          */
 354         num_sockets = smbd_sockinit(smb_ports, fd_listenset, &idle_timeout);
 355         if (num_sockets == 0) {
 356                 return False;
 357         }
 358
 359         for (i = 0; i < num_sockets; ++i) {
 360                 FD_SET(fd_listenset[i], &listen_set);
 361                 maxfd = MAX(maxfd, fd_listenset[i]);
 362         }
 363
 364         /* Listen to messages */
 365
 366         messaging_register(smbd_messaging_context(), NULL,
 367                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 368         messaging_register(smbd_messaging_context(), NULL,
 369                            MSG_SMB_SAM_REPL, msg_sam_repl);
 370         messaging_register(smbd_messaging_context(), NULL,
 371                            MSG_SHUTDOWN, msg_exit_server);
 372         messaging_register(smbd_messaging_context(), NULL,
 373                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 374         messaging_register(smbd_messaging_context(), NULL,
 375                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 376         messaging_register(smbd_messaging_context(), NULL,
 377                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 378         brl_register_msgs(smbd_messaging_context());
 379
 380 #ifdef DEVELOPER
 381         messaging_register(smbd_messaging_context(), NULL,
 382                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 383 #endif
 384
 385         /* now accept incoming connections - forking a new process
 386            for each incoming connection */
 387         DEBUG(2,("waiting for a connection\n"));
 388         while (1) {
 389                 struct timeval now;
 390                 fd_set r_fds, w_fds;
 391                 int num;
 392
 393                 /* Free up temporary memory from the main smbd. */
 394                 lp_TALLOC_FREE();
 395
 396                 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
 397                 message_dispatch(smbd_messaging_context());
 398
 399                 if (got_sig_cld) {
 400                         pid_t pid;
 401                         got_sig_cld = False;
 402
 403                         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 404                                 remove_child_pid(pid);
 405                         }
 406                 }
 407
 408                 memcpy((char *)&r_fds, (char *)&listen_set,
 409                        sizeof(listen_set));
 410                 FD_ZERO(&w_fds);
 411                 GetTimeOfDay(&now);
 412
 413                 event_add_to_select_args(smbd_event_context(), &now,
 414                                          &r_fds, &w_fds, &idle_timeout,
 415                                          &maxfd);
 416
 417                 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
 418                                  timeval_is_zero(&idle_timeout) ?
 419                                  NULL : &idle_timeout);
 420
 421                 if (num == -1 && errno == EINTR) {
 422                         if (got_sig_term) {
 423                                 exit_server_cleanly(NULL);
 424                         }
 425
 426                         /* check for sighup processing */
 427                         if (reload_after_sighup) {
 428                                 change_to_root_user();
 429                                 DEBUG(1,("Reloading services after SIGHUP\n"));
 430                                 reload_services(False);
 431                                 reload_after_sighup = 0;
 432                         }
 433
 434                         continue;
 435                 }
 436
 437                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 438                         continue;
 439                 }
 440
 441 #if 0
 442                 Deactivated for now, this needs to become a timed event
 443                 vl
 444
 445                 /* If the idle timeout fired and we don't have any connected
 446                  * users, exit gracefully. We should be running under a process
 447                  * controller that will restart us if necessry.
 448                  */
 449                 if (num == 0 && count_all_current_connections() == 0) {
 450                         exit_server_cleanly("idle timeout");
 451                 }
 452 #endif
 453
 454                 /* check if we need to reload services */
 455                 check_reload(time(NULL));
 456
 457                 /* Find the sockets that are read-ready -
 458                    accept on these. */
 459                 for( ; num > 0; num--) {
 460                         struct sockaddr addr;
 461                         socklen_t in_addrlen = sizeof(addr);
 462                         pid_t child = 0;
 463
 464                         s = -1;
 465                         for(i = 0; i < num_sockets; i++) {
 466                                 if(FD_ISSET(fd_listenset[i],&r_fds)) {
 467                                         s = fd_listenset[i];
 468                                         /* Clear this so we don't look
 469                                            at it again. */
 470                                         FD_CLR(fd_listenset[i],&r_fds);
 471                                         break;
 472                                 }
 473                         }
 474
 475                         smbd_set_server_fd(accept(s,&addr,&in_addrlen));
 476
 477                         if (smbd_server_fd() == -1 && errno == EINTR)
 478                                 continue;
 479
 480                         if (smbd_server_fd() == -1) {
 481                                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 482                                          strerror(errno)));
 483                                 continue;
 484                         }
 485
 486                         /* Ensure child is set to blocking mode */
 487                         set_blocking(smbd_server_fd(),True);
 488
 489                         /* In interactive mode, return with a connected socket.
 490                          * Foreground and daemon modes should fork worker
 491                          * processes.
 492                          */
 493                         if (server_mode == SERVER_MODE_INTERACTIVE) {
 494                                 return True;
 495                         }
 496
 497                         if (allowable_number_of_smbd_processes() &&
 498                             smbd_server_fd() != -1 &&
 499                             ((child = sys_fork())==0)) {
 500                                 /* Child code ... */
 501
 502                                 /* Stop zombies, the parent explicitly handles
 503                                  * them, counting worker smbds. */
 504                                 CatchChild();
 505
 506                                 /* close the listening socket(s) */
 507                                 for(i = 0; i < num_sockets; i++)
 508                                         close(fd_listenset[i]);
 509
 510                                 /* close our standard file
 511                                    descriptors */
 512                                 close_low_fds(False);
 513                                 am_parent = 0;
 514
 515                                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 516                                 set_socket_options(smbd_server_fd(),user_socket_options);
 517
 518                                 /* this is needed so that we get decent entries
 519                                    in smbstatus for port 445 connects */
 520                                 set_remote_machine_name(get_peer_addr(smbd_server_fd()),
 521                                                         False);
 522
 523                                 /* Reset the state of the random
 524                                  * number generation system, so
 525                                  * children do not get the same random
 526                                  * numbers as each other */
 527
 528                                 set_need_random_reseed();
 529                                 /* tdb needs special fork handling - remove
 530                                  * CLEAR_IF_FIRST flags */
 531                                 if (tdb_reopen_all(1) == -1) {
 532                                         DEBUG(0,("tdb_reopen_all failed.\n"));
 533                                         smb_panic("tdb_reopen_all failed.");
 534                                 }
 535
 536                                 return True;
 537                         }
 538                         /* The parent doesn't need this socket */
 539                         close(smbd_server_fd());
 540
 541                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 542                                 Clear the closed fd info out of server_fd --
 543                                 and more importantly, out of client_fd in
 544                                 util_sock.c, to avoid a possible
 545                                 getpeername failure if we reopen the logs
 546                                 and use %I in the filename.
 547                         */
 548
 549                         smbd_set_server_fd(-1);
 550
 551                         if (child != 0) {
 552                                 add_child_pid(child);
 553                         }
 554
 555                         /* Force parent to check log size after
 556                          * spawning child.  Fix from
 557                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 558                          * parent smbd will log to logserver.smb.  It
 559                          * writes only two messages for each child
 560                          * started/finished. But each child writes,
 561                          * say, 50 messages also in logserver.smb,
 562                          * begining with the debug_count of the
 563                          * parent, before the child opens its own log
 564                          * file logserver.client. In a worst case
 565                          * scenario the size of logserver.smb would be
 566                          * checked after about 50*50=2500 messages
 567                          * (ca. 100kb).
 568                          * */
 569                         force_check_log_size();
 570
 571                 } /* end for num */
 572         } /* end while 1 */
 573
 574 /* NOTREACHED   return True; */
 575 }
 576
 577 /****************************************************************************
 578  Reload printers
 579 **************************************************************************/
 580 void reload_printers(void)
 581 {
 582         int snum;
 583         int n_services = lp_numservices();
 584         int pnum = lp_servicenumber(PRINTERS_NAME);
 585         const char *pname;
 586
 587         pcap_cache_reload();
 588
 589         /* remove stale printers */
 590         for (snum = 0; snum < n_services; snum++) {
 591                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 592                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 593                                       lp_autoloaded(snum)))
 594                         continue;
 595
 596                 pname = lp_printername(snum);
 597                 if (!pcap_printername_ok(pname)) {
 598                         DEBUG(3, ("removing stale printer %s\n", pname));
 599
 600                         if (is_printer_published(NULL, snum, NULL))
 601                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 602                         del_a_printer(pname);
 603                         lp_killservice(snum);
 604                 }
 605         }
 606
 607         load_printers();
 608 }
 609
 610 /****************************************************************************
 611  Reload the services file.
 612 **************************************************************************/
 613
 614 BOOL reload_services(BOOL test)
 615 {
 616         BOOL ret;
 617
 618         if (lp_loaded()) {
 619                 pstring fname;
 620                 pstrcpy(fname,lp_configfile());
 621                 if (file_exist(fname, NULL) &&
 622                     !strcsequal(fname, dyn_CONFIGFILE)) {
 623                         pstrcpy(dyn_CONFIGFILE, fname);
 624                         test = False;
 625                 }
 626         }
 627
 628         reopen_logs();
 629
 630         if (test && !lp_file_list_changed())
 631                 return(True);
 632
 633         lp_killunused(conn_snum_used);
 634
 635         ret = lp_load(dyn_CONFIGFILE, False, False, True, True);
 636
 637         reload_printers();
 638
 639         /* perhaps the config filename is now set */
 640         if (!test)
 641                 reload_services(True);
 642
 643         reopen_logs();
 644
 645         load_interfaces();
 646
 647         if (smbd_server_fd() != -1) {
 648                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 649                 set_socket_options(smbd_server_fd(), user_socket_options);
 650         }
 651
 652         mangle_reset_cache();
 653         reset_stat_cache();
 654
 655         /* this forces service parameters to be flushed */
 656         set_current_service(NULL,0,True);
 657
 658         return(ret);
 659 }
 660
 661 /****************************************************************************
 662  Exit the server.
 663 ****************************************************************************/
 664
 665 /* Reasons for shutting down a server process. */
 666 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 667
 668 static void exit_server_common(enum server_exit_reason how,
 669         const char *const reason) NORETURN_ATTRIBUTE;
 670
 671 static void exit_server_common(enum server_exit_reason how,
 672         const char *const reason)
 673 {
 674         static int firsttime=1;
 675
 676         if (!firsttime)
 677                 exit(0);
 678         firsttime = 0;
 679
 680         change_to_root_user();
 681
 682         if (negprot_global_auth_context) {
 683                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 684         }
 685
 686         conn_close_all();
 687
 688         invalidate_all_vuids();
 689
 690         /* 3 second timeout. */
 691         print_notify_send_messages(smbd_messaging_context(), 3);
 692
 693         /* delete our entry in the connections database. */
 694         yield_connection(NULL,"");
 695
 696         respond_to_all_remaining_local_messages();
 697
 698 #ifdef WITH_DFS
 699         if (dcelogin_atmost_once) {
 700                 dfs_unlogin();
 701         }
 702 #endif
 703
 704         locking_end();
 705         printing_end();
 706
 707         server_encryption_shutdown();
 708
 709         if (how != SERVER_EXIT_NORMAL) {
 710                 int oldlevel = DEBUGLEVEL;
 711                 char *last_inbuf = get_InBuffer();
 712
 713                 DEBUGLEVEL = 10;
 714
 715                 DEBUGSEP(0);
 716                 DEBUG(0,("Abnormal server exit: %s\n",
 717                         reason ? reason : "no explanation provided"));
 718                 DEBUGSEP(0);
 719
 720                 log_stack_trace();
 721                 if (last_inbuf) {
 722                         DEBUG(0,("Last message was %s\n", LAST_MESSAGE()));
 723                         show_msg(last_inbuf);
 724                 }
 725
 726                 DEBUGLEVEL = oldlevel;
 727                 dump_core();
 728
 729         } else {
 730                 DEBUG(3,("Server exit (%s)\n",
 731                         (reason ? reason : "normal exit")));
 732         }
 733
 734         exit(0);
 735 }
 736
 737 void exit_server(const char *const explanation)
 738 {
 739         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 740 }
 741
 742 void exit_server_cleanly(const char *const explanation)
 743 {
 744         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 745 }
 746
 747 void exit_server_fault(void)
 748 {
 749         exit_server("critical server fault");
 750 }
 751
 752 /****************************************************************************
 753  Initialise connect, service and file structs.
 754 ****************************************************************************/
 755
 756 static BOOL init_structs(void )
 757 {
 758         /*
 759          * Set the machine NETBIOS name if not already
 760          * set from the config file.
 761          */
 762
 763         if (!init_names())
 764                 return False;
 765
 766         conn_init();
 767
 768         file_init();
 769
 770         /* for RPC pipes */
 771         init_rpc_pipe_hnd();
 772
 773         init_dptrs();
 774
 775         secrets_init();
 776
 777         return True;
 778 }
 779
 780 /*
 781  * Send keepalive packets to our client
 782  */
 783 static BOOL keepalive_fn(const struct timeval *now, void *private_data)
 784 {
 785         if (!send_keepalive(smbd_server_fd())) {
 786                 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
 787                 return False;
 788         }
 789         return True;
 790 }
 791
 792 /*
 793  * Do the recurring check if we're idle
 794  */
 795 static BOOL deadtime_fn(const struct timeval *now, void *private_data)
 796 {
 797         if ((conn_num_open() == 0)
 798             || (conn_idle_all(now->tv_sec))) {
 799                 DEBUG( 2, ( "Closing idle connection\n" ) );
 800                 messaging_send(smbd_messaging_context(), procid_self(),
 801                                MSG_SHUTDOWN, &data_blob_null);
 802                 return False;
 803         }
 804
 805         return True;
 806 }
 807
 808
 809 /****************************************************************************
 810  main program.
 811 ****************************************************************************/
 812
 813 /* Declare prototype for build_options() to avoid having to run it through
 814    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 815    prototype generation system is too complicated. */
 816
 817 extern void build_options(BOOL screen);
 818
 819  int main(int argc,const char *argv[])
 820 {
 821         /* shall I run as a daemon */
 822         BOOL no_process_group = False;
 823         BOOL log_stdout = False;
 824         const char *ports = NULL;
 825         const char *profile_level = NULL;
 826         int opt;
 827         poptContext pc;
 828
 829         enum smb_server_mode server_mode = SERVER_MODE_DAEMON;
 830
 831         struct poptOption long_options[] = {
 832         POPT_AUTOHELP
 833         {"daemon", 'D', POPT_ARG_VAL, &server_mode, SERVER_MODE_DAEMON,
 834                 "Become a daemon (default)" },
 835         {"interactive", 'i', POPT_ARG_VAL, &server_mode, SERVER_MODE_INTERACTIVE,
 836                 "Run interactive (not a daemon)"},
 837         {"foreground", 'F', POPT_ARG_VAL, &server_mode, SERVER_MODE_FOREGROUND,
 838                 "Run daemon in foreground (for daemontools, etc.)" },
 839         {"no-process-group", '\0', POPT_ARG_VAL, &no_process_group, True,
 840                 "Don't create a new process group" },
 841         {"log-stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 842         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 843         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 844         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 845         POPT_COMMON_SAMBA
 846         POPT_COMMON_DYNCONFIG
 847         POPT_TABLEEND
 848         };
 849
 850         load_case_tables();
 851
 852         TimeInit();
 853
 854 #ifdef HAVE_SET_AUTH_PARAMETERS
 855         set_auth_parameters(argc,argv);
 856 #endif
 857
 858         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 859
 860         while((opt = poptGetNextOpt(pc)) != -1) {
 861                 switch (opt)  {
 862                 case 'b':
 863                         build_options(True); /* Display output to screen as well as debug */
 864                         exit(0);
 865                         break;
 866                 }
 867         }
 868
 869         poptFreeContext(pc);
 870
 871 #ifdef HAVE_SETLUID
 872         /* needed for SecureWare on SCO */
 873         setluid(0);
 874 #endif
 875
 876         sec_init();
 877
 878         set_remote_machine_name("smbd", False);
 879
 880         if (server_mode == SERVER_MODE_INTERACTIVE) {
 881                 log_stdout = True;
 882                 if (DEBUGLEVEL >= 9) {
 883                         talloc_enable_leak_report();
 884                 }
 885         }
 886
 887         if (log_stdout && server_mode == SERVER_MODE_DAEMON) {
 888                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 889                 exit(1);
 890         }
 891
 892         setup_logging(argv[0],log_stdout);
 893
 894         /* we want to re-seed early to prevent time delays causing
 895            client problems at a later date. (tridge) */
 896         generate_random_buffer(NULL, 0);
 897
 898         /* make absolutely sure we run as root - to handle cases where people
 899            are crazy enough to have it setuid */
 900
 901         gain_root_privilege();
 902         gain_root_group_privilege();
 903
 904         fault_setup((void (*)(void *))exit_server_fault);
 905         dump_core_setup("smbd");
 906
 907         CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
 908         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
 909
 910         /* we are never interested in SIGPIPE */
 911         BlockSignals(True,SIGPIPE);
 912
 913 #if defined(SIGFPE)
 914         /* we are never interested in SIGFPE */
 915         BlockSignals(True,SIGFPE);
 916 #endif
 917
 918 #if defined(SIGUSR2)
 919         /* We are no longer interested in USR2 */
 920         BlockSignals(True,SIGUSR2);
 921 #endif
 922
 923         /* POSIX demands that signals are inherited. If the invoking process has
 924          * these signals masked, we will have problems, as we won't recieve them. */
 925         BlockSignals(False, SIGHUP);
 926         BlockSignals(False, SIGUSR1);
 927         BlockSignals(False, SIGTERM);
 928
 929         /* we want total control over the permissions on created files,
 930            so set our umask to 0 */
 931         umask(0);
 932
 933         init_sec_ctx();
 934
 935         reopen_logs();
 936
 937         DEBUG(0,( "smbd version %s started.\n", SAMBA_VERSION_STRING));
 938         DEBUGADD( 0, ( "%s\n", COPYRIGHT_STARTUP_MESSAGE ) );
 939
 940         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
 941                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
 942
 943         /* Output the build options to the debug log */
 944         build_options(False);
 945
 946         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
 947                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
 948                 exit(1);
 949         }
 950
 951         /*
 952          * Do this before reload_services.
 953          */
 954
 955         if (!reload_services(False))
 956                 return(-1);
 957
 958         init_structs();
 959
 960 #ifdef WITH_PROFILE
 961         if (!profile_setup(smbd_messaging_context(), False)) {
 962                 DEBUG(0,("ERROR: failed to setup profiling\n"));
 963                 return -1;
 964         }
 965         if (profile_level != NULL) {
 966                 int pl = atoi(profile_level);
 967                 struct server_id src;
 968
 969                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
 970                 src.pid = getpid();
 971                 set_profile_level(pl, src);
 972         }
 973 #endif
 974
 975         DEBUG(3,( "loaded services\n"));
 976
 977         if (is_a_socket(0)) {
 978                 if (server_mode == SERVER_MODE_DAEMON) {
 979                         DEBUG(0,("standard input is a socket, "
 980                                     "assuming -F option\n"));
 981                 }
 982                 server_mode = SERVER_MODE_INETD;
 983         }
 984
 985         if (server_mode == SERVER_MODE_DAEMON) {
 986                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
 987                 become_daemon(True, no_process_group);
 988         } else if (server_mode == SERVER_MODE_FOREGROUND) {
 989                 become_daemon(False, no_process_group);
 990         }
 991
 992 #if HAVE_SETPGID
 993         /*
 994          * If we're interactive we want to set our own process group for
 995          * signal management.
 996          */
 997         if (server_mode == SERVER_MODE_INTERACTIVE && !no_process_group) {
 998                 setpgid( (pid_t)0, (pid_t)0);
 999         }
1000 #endif
1001
1002         if (!directory_exist(lp_lockdir(), NULL))
1003                 mkdir(lp_lockdir(), 0755);
1004
1005         if (server_mode != SERVER_MODE_INETD &&
1006             server_mode != SERVER_MODE_INTERACTIVE) {
1007                 pidfile_create("smbd");
1008         }
1009
1010         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1011
1012         if (smbd_messaging_context() == NULL)
1013                 exit(1);
1014
1015         /* Initialise the password backed before the global_sam_sid
1016            to ensure that we fetch from ldap before we make a domain sid up */
1017
1018         if(!initialize_password_db(False, smbd_event_context()))
1019                 exit(1);
1020
1021         if (!secrets_init()) {
1022                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1023                 exit(1);
1024         }
1025
1026         if(!get_global_sam_sid()) {
1027                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1028                 exit(1);
1029         }
1030
1031         if (!session_init())
1032                 exit(1);
1033
1034         if (!connections_init(True))
1035                 exit(1);
1036
1037         if (!locking_init(0))
1038                 exit(1);
1039
1040         namecache_enable();
1041
1042         if (!init_registry())
1043                 exit(1);
1044
1045 #if 0
1046         if (!init_svcctl_db())
1047                 exit(1);
1048 #endif
1049
1050         if (!print_backend_init(smbd_messaging_context()))
1051                 exit(1);
1052
1053         if (!init_guest_info()) {
1054                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1055                 return -1;
1056         }
1057
1058         /* Setup the main smbd so that we can get messages. */
1059         /* don't worry about general printing messages here */
1060
1061         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_SMBD);
1062
1063         /* only start the background queue daemon if we are
1064            running as a daemon -- bad things will happen if
1065            smbd is launched via inetd and we fork a copy of
1066            ourselves here */
1067         if (server_mode != SERVER_MODE_INETD &&
1068             server_mode != SERVER_MODE_INTERACTIVE) {
1069                 start_background_queue();
1070         }
1071
1072         /* Always attempt to initialize DMAPI. We will only use it later if
1073          * lp_dmapi_support is set on the share, but we need a single global
1074          * session to work with.
1075          */
1076         dmapi_init_session();
1077
1078         if (!open_sockets_smbd(server_mode, ports)) {
1079                 exit(1);
1080         }
1081
1082         /*
1083          * everything after this point is run after the fork()
1084          */
1085
1086         static_init_rpc;
1087
1088         init_modules();
1089
1090         /* Possibly reload the services file. Only worth doing in
1091          * daemon mode. In inetd mode, we know we only just loaded this.
1092          */
1093         if (server_mode != SERVER_MODE_INETD &&
1094             server_mode != SERVER_MODE_INTERACTIVE) {
1095                 reload_services(True);
1096         }
1097
1098         if (!init_account_policy()) {
1099                 DEBUG(0,("Could not open account policy tdb.\n"));
1100                 exit(1);
1101         }
1102
1103         if (*lp_rootdir()) {
1104                 if (sys_chroot(lp_rootdir()) == 0)
1105                         DEBUG(2,("Changed root to %s\n", lp_rootdir()));
1106         }
1107
1108         /* Setup oplocks */
1109         if (!init_oplocks(smbd_messaging_context()))
1110                 exit(1);
1111
1112         /* Setup aio signal handler. */
1113         initialize_async_io_handler();
1114
1115         /* register our message handlers */
1116         messaging_register(smbd_messaging_context(), NULL,
1117                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
1118
1119         if ((lp_keepalive() != 0)
1120             && !(event_add_idle(smbd_event_context(), NULL,
1121                                 timeval_set(lp_keepalive(), 0),
1122                                 "keepalive", keepalive_fn,
1123                                 NULL))) {
1124                 DEBUG(0, ("Could not add keepalive event\n"));
1125                 exit(1);
1126         }
1127
1128         if (!(event_add_idle(smbd_event_context(), NULL,
1129                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
1130                              "deadtime", deadtime_fn, NULL))) {
1131                 DEBUG(0, ("Could not add deadtime event\n"));
1132                 exit(1);
1133         }
1134
1135         smbd_process();
1136
1137         namecache_shutdown();
1138
1139         exit_server_cleanly(NULL);
1140         return(0);
1141 }