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
  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 SIG_ATOMIC_T got_sig_term;
  38 extern SIG_ATOMIC_T reload_after_sighup;
  39 static SIG_ATOMIC_T got_sig_cld;
  40
  41 #ifdef WITH_DFS
  42 extern int dcelogin_atmost_once;
  43 #endif /* WITH_DFS */
  44
  45 /* really we should have a top level context structure that has the
  46    client file descriptor as an element. That would require a major rewrite :(
  47
  48    the following 2 functions are an alternative - they make the file
  49    descriptor private to smbd
  50  */
  51 static int server_fd = -1;
  52
  53 int smbd_server_fd(void)
  54 {
  55         return server_fd;
  56 }
  57
  58 static void smbd_set_server_fd(int fd)
  59 {
  60         server_fd = fd;
  61 }
  62
  63 int get_client_fd(void)
  64 {
  65         return server_fd;
  66 }
  67
  68 struct event_context *smbd_event_context(void)
  69 {
  70         static struct event_context *ctx;
  71
  72         if (!ctx && !(ctx = event_context_init(NULL))) {
  73                 smb_panic("Could not init smbd event context");
  74         }
  75         return ctx;
  76 }
  77
  78 struct messaging_context *smbd_messaging_context(void)
  79 {
  80         static struct messaging_context *ctx;
  81
  82         if (!ctx && !(ctx = messaging_init(NULL, server_id_self(),
  83                                            smbd_event_context()))) {
  84                 smb_panic("Could not init smbd messaging context");
  85         }
  86         return ctx;
  87 }
  88
  89 /*******************************************************************
  90  What to do when smb.conf is updated.
  91  ********************************************************************/
  92
  93 static void smb_conf_updated(struct messaging_context *msg,
  94                              void *private_data,
  95                              uint32_t msg_type,
  96                              struct server_id server_id,
  97                              DATA_BLOB *data)
  98 {
  99         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
 100                   "updated. Reloading.\n"));
 101         reload_services(False);
 102 }
 103
 104
 105 /*******************************************************************
 106  Delete a statcache entry.
 107  ********************************************************************/
 108
 109 static void smb_stat_cache_delete(struct messaging_context *msg,
 110                                   void *private_data,
 111                                   uint32_t msg_tnype,
 112                                   struct server_id server_id,
 113                                   DATA_BLOB *data)
 114 {
 115         const char *name = (const char *)data->data;
 116         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 117         stat_cache_delete(name);
 118 }
 119
 120 /****************************************************************************
 121  Terminate signal.
 122 ****************************************************************************/
 123
 124 static void sig_term(void)
 125 {
 126         got_sig_term = 1;
 127         sys_select_signal(SIGTERM);
 128 }
 129
 130 /****************************************************************************
 131  Catch a sighup.
 132 ****************************************************************************/
 133
 134 static void sig_hup(int sig)
 135 {
 136         reload_after_sighup = 1;
 137         sys_select_signal(SIGHUP);
 138 }
 139
 140 /****************************************************************************
 141  Catch a sigcld
 142 ****************************************************************************/
 143 static void sig_cld(int sig)
 144 {
 145         got_sig_cld = 1;
 146         sys_select_signal(SIGCLD);
 147 }
 148
 149 /****************************************************************************
 150   Send a SIGTERM to our process group.
 151 *****************************************************************************/
 152
 153 static void  killkids(void)
 154 {
 155         if(am_parent) kill(0,SIGTERM);
 156 }
 157
 158 /****************************************************************************
 159  Process a sam sync message - not sure whether to do this here or
 160  somewhere else.
 161 ****************************************************************************/
 162
 163 static void msg_sam_sync(struct messaging_context *msg,
 164                          void *private_data,
 165                          uint32_t msg_type,
 166                          struct server_id server_id,
 167                          DATA_BLOB *data)
 168 {
 169         DEBUG(10, ("** sam sync message received, ignoring\n"));
 170 }
 171
 172
 173 /****************************************************************************
 174  Open the socket communication - inetd.
 175 ****************************************************************************/
 176
 177 static bool open_sockets_inetd(void)
 178 {
 179         /* Started from inetd. fd 0 is the socket. */
 180         /* We will abort gracefully when the client or remote system
 181            goes away */
 182         smbd_set_server_fd(dup(0));
 183
 184         /* close our standard file descriptors */
 185         close_low_fds(False); /* Don't close stderr */
 186
 187         set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 188         set_socket_options(smbd_server_fd(), lp_socket_options());
 189
 190         return True;
 191 }
 192
 193 static void msg_exit_server(struct messaging_context *msg,
 194                             void *private_data,
 195                             uint32_t msg_type,
 196                             struct server_id server_id,
 197                             DATA_BLOB *data)
 198 {
 199         DEBUG(3, ("got a SHUTDOWN message\n"));
 200         exit_server_cleanly(NULL);
 201 }
 202
 203 #ifdef DEVELOPER
 204 static void msg_inject_fault(struct messaging_context *msg,
 205                              void *private_data,
 206                              uint32_t msg_type,
 207                              struct server_id src,
 208                              DATA_BLOB *data)
 209 {
 210         int sig;
 211
 212         if (data->length != sizeof(sig)) {
 213
 214                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 215                           procid_str_static(&src)));
 216                 return;
 217         }
 218
 219         sig = *(int *)data->data;
 220         if (sig == -1) {
 221                 exit_server("internal error injected");
 222                 return;
 223         }
 224
 225 #if HAVE_STRSIGNAL
 226         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 227                   procid_str_static(&src), sig, strsignal(sig)));
 228 #else
 229         DEBUG(0, ("Process %s requested injection of signal %d\n",
 230                   procid_str_static(&src), sig));
 231 #endif
 232
 233         kill(sys_getpid(), sig);
 234 }
 235 #endif /* DEVELOPER */
 236
 237 struct child_pid {
 238         struct child_pid *prev, *next;
 239         pid_t pid;
 240 };
 241
 242 static struct child_pid *children;
 243 static int num_children;
 244
 245 static void add_child_pid(pid_t pid)
 246 {
 247         struct child_pid *child;
 248
 249         if (lp_max_smbd_processes() == 0) {
 250                 /* Don't bother with the child list if we don't care anyway */
 251                 return;
 252         }
 253
 254         child = SMB_MALLOC_P(struct child_pid);
 255         if (child == NULL) {
 256                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 257                 return;
 258         }
 259         child->pid = pid;
 260         DLIST_ADD(children, child);
 261         num_children += 1;
 262 }
 263
 264 static void remove_child_pid(pid_t pid)
 265 {
 266         struct child_pid *child;
 267
 268         if (lp_max_smbd_processes() == 0) {
 269                 /* Don't bother with the child list if we don't care anyway */
 270                 return;
 271         }
 272
 273         for (child = children; child != NULL; child = child->next) {
 274                 if (child->pid == pid) {
 275                         struct child_pid *tmp = child;
 276                         DLIST_REMOVE(children, child);
 277                         SAFE_FREE(tmp);
 278                         num_children -= 1;
 279                         return;
 280                 }
 281         }
 282
 283         DEBUG(0, ("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 /****************************************************************************
 301  Open the socket communication.
 302 ****************************************************************************/
 303
 304 static bool open_sockets_smbd(bool is_daemon, bool interactive, const char *smb_ports)
 305 {
 306         int num_interfaces = iface_count();
 307         int num_sockets = 0;
 308         int fd_listenset[FD_SETSIZE];
 309         fd_set listen_set;
 310         int s;
 311         int maxfd = 0;
 312         int i;
 313         char *ports;
 314
 315         if (!is_daemon) {
 316                 return open_sockets_inetd();
 317         }
 318
 319 #ifdef HAVE_ATEXIT
 320         {
 321                 static int atexit_set;
 322                 if(atexit_set == 0) {
 323                         atexit_set=1;
 324                         atexit(killkids);
 325                 }
 326         }
 327 #endif
 328
 329         /* Stop zombies */
 330         CatchSignal(SIGCLD, sig_cld);
 331
 332         FD_ZERO(&listen_set);
 333
 334         /* use a reasonable default set of ports - listing on 445 and 139 */
 335         if (!smb_ports) {
 336                 ports = lp_smb_ports();
 337                 if (!ports || !*ports) {
 338                         ports = smb_xstrdup(SMB_PORTS);
 339                 } else {
 340                         ports = smb_xstrdup(ports);
 341                 }
 342         } else {
 343                 ports = smb_xstrdup(smb_ports);
 344         }
 345
 346         if (lp_interfaces() && lp_bind_interfaces_only()) {
 347                 /* We have been given an interfaces line, and been
 348                    told to only bind to those interfaces. Create a
 349                    socket per interface and bind to only these.
 350                 */
 351
 352                 /* Now open a listen socket for each of the
 353                    interfaces. */
 354                 for(i = 0; i < num_interfaces; i++) {
 355                         const struct sockaddr_storage *ifss =
 356                                         iface_n_sockaddr_storage(i);
 357                         fstring tok;
 358                         const char *ptr;
 359
 360                         if (ifss == NULL) {
 361                                 DEBUG(0,("open_sockets_smbd: "
 362                                         "interface %d has NULL IP address !\n",
 363                                         i));
 364                                 continue;
 365                         }
 366
 367                         for (ptr=ports; next_token(&ptr, tok, " \t,",
 368                                                 sizeof(tok)); ) {
 369                                 unsigned port = atoi(tok);
 370                                 if (port == 0 || port > 0xffff) {
 371                                         continue;
 372                                 }
 373                                 s = fd_listenset[num_sockets] =
 374                                         open_socket_in(SOCK_STREAM, port, 0,
 375                                                         ifss, True);
 376                                 if(s == -1) {
 377                                         continue;
 378                                 }
 379
 380                                 /* ready to listen */
 381                                 set_socket_options(s,"SO_KEEPALIVE");
 382                                 set_socket_options(s,lp_socket_options());
 383
 384                                 /* Set server socket to
 385                                  * non-blocking for the accept. */
 386                                 set_blocking(s,False);
 387
 388                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 389                                         DEBUG(0,("open_sockets_smbd: listen: "
 390                                                 "%s\n", strerror(errno)));
 391                                         close(s);
 392                                         return False;
 393                                 }
 394                                 FD_SET(s,&listen_set);
 395                                 maxfd = MAX( maxfd, s);
 396
 397                                 num_sockets++;
 398                                 if (num_sockets >= FD_SETSIZE) {
 399                                         DEBUG(0,("open_sockets_smbd: Too "
 400                                                 "many sockets to bind to\n"));
 401                                         return False;
 402                                 }
 403                         }
 404                 }
 405         } else {
 406                 /* Just bind to 0.0.0.0 - accept connections
 407                    from anywhere. */
 408
 409                 fstring tok;
 410                 const char *ptr;
 411                 const char *sock_addr = lp_socket_address();
 412                 fstring sock_tok;
 413                 const char *sock_ptr;
 414
 415                 if (strequal(sock_addr, "0.0.0.0") ||
 416                                 strequal(sock_addr, "::")) {
 417 #if HAVE_IPV6
 418                         sock_addr = "::,0.0.0.0";
 419 #else
 420                         sock_addr = "0.0.0.0";
 421 #endif
 422                 }
 423
 424                 for (sock_ptr=sock_addr; next_token(&sock_ptr, sock_tok, " \t,",
 425                                         sizeof(sock_tok)); ) {
 426                         for (ptr=ports; next_token(&ptr, tok, " \t,",
 427                                                 sizeof(tok)); ) {
 428                                 struct sockaddr_storage ss;
 429
 430                                 unsigned port = atoi(tok);
 431                                 if (port == 0 || port > 0xffff) {
 432                                         continue;
 433                                 }
 434                                 /* open an incoming socket */
 435                                 if (!interpret_string_addr(&ss, sock_tok,
 436                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 437                                         continue;
 438                                 }
 439
 440                                 s = open_socket_in(SOCK_STREAM, port, 0,
 441                                                    &ss, true);
 442                                 if (s == -1) {
 443                                         continue;
 444                                 }
 445
 446                                 /* ready to listen */
 447                                 set_socket_options(s,"SO_KEEPALIVE");
 448                                 set_socket_options(s,lp_socket_options());
 449
 450                                 /* Set server socket to non-blocking
 451                                  * for the accept. */
 452                                 set_blocking(s,False);
 453
 454                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 455                                         DEBUG(0,("open_sockets_smbd: "
 456                                                 "listen: %s\n",
 457                                                  strerror(errno)));
 458                                         close(s);
 459                                         return False;
 460                                 }
 461
 462                                 fd_listenset[num_sockets] = s;
 463                                 FD_SET(s,&listen_set);
 464                                 maxfd = MAX( maxfd, s);
 465
 466                                 num_sockets++;
 467
 468                                 if (num_sockets >= FD_SETSIZE) {
 469                                         DEBUG(0,("open_sockets_smbd: Too "
 470                                                 "many sockets to bind to\n"));
 471                                         return False;
 472                                 }
 473                         }
 474                 }
 475         }
 476
 477         SAFE_FREE(ports);
 478
 479         if (num_sockets == 0) {
 480                 DEBUG(0,("open_sockets_smbd: No "
 481                         "sockets available to bind to.\n"));
 482                 return false;
 483         }
 484
 485         /* Setup the main smbd so that we can get messages. Note that
 486            do this after starting listening. This is needed as when in
 487            clustered mode, ctdb won't allow us to start doing database
 488            operations until it has gone thru a full startup, which
 489            includes checking to see that smbd is listening. */
 490         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_SMBD);
 491
 492         /* Listen to messages */
 493
 494         messaging_register(smbd_messaging_context(), NULL,
 495                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 496         messaging_register(smbd_messaging_context(), NULL,
 497                            MSG_SHUTDOWN, msg_exit_server);
 498         messaging_register(smbd_messaging_context(), NULL,
 499                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 500         messaging_register(smbd_messaging_context(), NULL,
 501                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 502         messaging_register(smbd_messaging_context(), NULL,
 503                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 504         brl_register_msgs(smbd_messaging_context());
 505
 506 #ifdef DEVELOPER
 507         messaging_register(smbd_messaging_context(), NULL,
 508                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 509 #endif
 510
 511         /* now accept incoming connections - forking a new process
 512            for each incoming connection */
 513         DEBUG(2,("waiting for a connection\n"));
 514         while (1) {
 515                 struct timeval now, idle_timeout;
 516                 fd_set r_fds, w_fds;
 517                 int num;
 518
 519                 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
 520                 message_dispatch(smbd_messaging_context());
 521
 522                 if (got_sig_cld) {
 523                         pid_t pid;
 524                         got_sig_cld = False;
 525
 526                         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 527                                 remove_child_pid(pid);
 528                         }
 529                 }
 530
 531                 idle_timeout = timeval_zero();
 532
 533                 memcpy((char *)&r_fds, (char *)&listen_set,
 534                        sizeof(listen_set));
 535                 FD_ZERO(&w_fds);
 536                 GetTimeOfDay(&now);
 537
 538                 event_add_to_select_args(smbd_event_context(), &now,
 539                                          &r_fds, &w_fds, &idle_timeout,
 540                                          &maxfd);
 541
 542                 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
 543                                  timeval_is_zero(&idle_timeout) ?
 544                                  NULL : &idle_timeout);
 545
 546                 if (num == -1 && errno == EINTR) {
 547                         if (got_sig_term) {
 548                                 exit_server_cleanly(NULL);
 549                         }
 550
 551                         /* check for sighup processing */
 552                         if (reload_after_sighup) {
 553                                 change_to_root_user();
 554                                 DEBUG(1,("Reloading services after SIGHUP\n"));
 555                                 reload_services(False);
 556                                 reload_after_sighup = 0;
 557                         }
 558
 559                         continue;
 560                 }
 561
 562                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 563                         continue;
 564                 }
 565
 566                 /* check if we need to reload services */
 567                 check_reload(time(NULL));
 568
 569                 /* Find the sockets that are read-ready -
 570                    accept on these. */
 571                 for( ; num > 0; num--) {
 572                         struct sockaddr addr;
 573                         socklen_t in_addrlen = sizeof(addr);
 574                         pid_t child = 0;
 575
 576                         s = -1;
 577                         for(i = 0; i < num_sockets; i++) {
 578                                 if(FD_ISSET(fd_listenset[i],&r_fds)) {
 579                                         s = fd_listenset[i];
 580                                         /* Clear this so we don't look
 581                                            at it again. */
 582                                         FD_CLR(fd_listenset[i],&r_fds);
 583                                         break;
 584                                 }
 585                         }
 586
 587                         smbd_set_server_fd(accept(s,&addr,&in_addrlen));
 588
 589                         if (smbd_server_fd() == -1 && errno == EINTR)
 590                                 continue;
 591
 592                         if (smbd_server_fd() == -1) {
 593                                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 594                                          strerror(errno)));
 595                                 continue;
 596                         }
 597
 598                         /* Ensure child is set to blocking mode */
 599                         set_blocking(smbd_server_fd(),True);
 600
 601                         if (smbd_server_fd() != -1 && interactive)
 602                                 return True;
 603
 604                         if (allowable_number_of_smbd_processes() &&
 605                             smbd_server_fd() != -1 &&
 606                             ((child = sys_fork())==0)) {
 607                                 char remaddr[INET6_ADDRSTRLEN];
 608
 609                                 /* Child code ... */
 610
 611                                 /* Stop zombies, the parent explicitly handles
 612                                  * them, counting worker smbds. */
 613                                 CatchChild();
 614
 615                                 /* close the listening socket(s) */
 616                                 for(i = 0; i < num_sockets; i++)
 617                                         close(fd_listenset[i]);
 618
 619                                 /* close our standard file
 620                                    descriptors */
 621                                 close_low_fds(False);
 622                                 am_parent = 0;
 623
 624                                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 625                                 set_socket_options(smbd_server_fd(),
 626                                                    lp_socket_options());
 627
 628                                 /* this is needed so that we get decent entries
 629                                    in smbstatus for port 445 connects */
 630                                 set_remote_machine_name(get_peer_addr(smbd_server_fd(),
 631                                                                 remaddr,
 632                                                                 sizeof(remaddr)),
 633                                                                 false);
 634
 635                                 /* Reset the state of the random
 636                                  * number generation system, so
 637                                  * children do not get the same random
 638                                  * numbers as each other */
 639
 640                                 set_need_random_reseed();
 641                                 /* tdb needs special fork handling - remove
 642                                  * CLEAR_IF_FIRST flags */
 643                                 if (tdb_reopen_all(1) == -1) {
 644                                         DEBUG(0,("tdb_reopen_all failed.\n"));
 645                                         smb_panic("tdb_reopen_all failed");
 646                                 }
 647
 648                                 return True;
 649                         }
 650                         /* The parent doesn't need this socket */
 651                         close(smbd_server_fd());
 652
 653                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 654                                 Clear the closed fd info out of server_fd --
 655                                 and more importantly, out of client_fd in
 656                                 util_sock.c, to avoid a possible
 657                                 getpeername failure if we reopen the logs
 658                                 and use %I in the filename.
 659                         */
 660
 661                         smbd_set_server_fd(-1);
 662
 663                         if (child != 0) {
 664                                 add_child_pid(child);
 665                         }
 666
 667                         /* Force parent to check log size after
 668                          * spawning child.  Fix from
 669                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 670                          * parent smbd will log to logserver.smb.  It
 671                          * writes only two messages for each child
 672                          * started/finished. But each child writes,
 673                          * say, 50 messages also in logserver.smb,
 674                          * begining with the debug_count of the
 675                          * parent, before the child opens its own log
 676                          * file logserver.client. In a worst case
 677                          * scenario the size of logserver.smb would be
 678                          * checked after about 50*50=2500 messages
 679                          * (ca. 100kb).
 680                          * */
 681                         force_check_log_size();
 682
 683                 } /* end for num */
 684         } /* end while 1 */
 685
 686 /* NOTREACHED   return True; */
 687 }
 688
 689 /****************************************************************************
 690  Reload printers
 691 **************************************************************************/
 692 void reload_printers(void)
 693 {
 694         int snum;
 695         int n_services = lp_numservices();
 696         int pnum = lp_servicenumber(PRINTERS_NAME);
 697         const char *pname;
 698
 699         pcap_cache_reload();
 700
 701         /* remove stale printers */
 702         for (snum = 0; snum < n_services; snum++) {
 703                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 704                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 705                                       lp_autoloaded(snum)))
 706                         continue;
 707
 708                 pname = lp_printername(snum);
 709                 if (!pcap_printername_ok(pname)) {
 710                         DEBUG(3, ("removing stale printer %s\n", pname));
 711
 712                         if (is_printer_published(NULL, snum, NULL))
 713                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 714                         del_a_printer(pname);
 715                         lp_killservice(snum);
 716                 }
 717         }
 718
 719         load_printers();
 720 }
 721
 722 /****************************************************************************
 723  Reload the services file.
 724 **************************************************************************/
 725
 726 bool reload_services(bool test)
 727 {
 728         bool ret;
 729
 730         if (lp_loaded()) {
 731                 char *fname = lp_configfile();
 732                 if (file_exist(fname, NULL) &&
 733                     !strcsequal(fname, dyn_CONFIGFILE)) {
 734                         strlcpy(dyn_CONFIGFILE, fname,sizeof(dyn_CONFIGFILE));
 735                         test = False;
 736                 }
 737         }
 738
 739         reopen_logs();
 740
 741         if (test && !lp_file_list_changed())
 742                 return(True);
 743
 744         lp_killunused(conn_snum_used);
 745
 746         ret = lp_load(dyn_CONFIGFILE, False, False, True, True);
 747
 748         reload_printers();
 749
 750         /* perhaps the config filename is now set */
 751         if (!test)
 752                 reload_services(True);
 753
 754         reopen_logs();
 755
 756         load_interfaces();
 757
 758         if (smbd_server_fd() != -1) {
 759                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 760                 set_socket_options(smbd_server_fd(), lp_socket_options());
 761         }
 762
 763         mangle_reset_cache();
 764         reset_stat_cache();
 765
 766         /* this forces service parameters to be flushed */
 767         set_current_service(NULL,0,True);
 768
 769         return(ret);
 770 }
 771
 772 /****************************************************************************
 773  Exit the server.
 774 ****************************************************************************/
 775
 776 /* Reasons for shutting down a server process. */
 777 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 778
 779 static void exit_server_common(enum server_exit_reason how,
 780         const char *const reason) NORETURN_ATTRIBUTE;
 781
 782 static void exit_server_common(enum server_exit_reason how,
 783         const char *const reason)
 784 {
 785         static int firsttime=1;
 786
 787         if (!firsttime)
 788                 exit(0);
 789         firsttime = 0;
 790
 791         change_to_root_user();
 792
 793         if (negprot_global_auth_context) {
 794                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 795         }
 796
 797         conn_close_all();
 798
 799         invalidate_all_vuids();
 800
 801         /* 3 second timeout. */
 802         print_notify_send_messages(smbd_messaging_context(), 3);
 803
 804         /* delete our entry in the connections database. */
 805         yield_connection(NULL,"");
 806
 807         respond_to_all_remaining_local_messages();
 808
 809 #ifdef WITH_DFS
 810         if (dcelogin_atmost_once) {
 811                 dfs_unlogin();
 812         }
 813 #endif
 814
 815         locking_end();
 816         printing_end();
 817
 818         if (how != SERVER_EXIT_NORMAL) {
 819                 int oldlevel = DEBUGLEVEL;
 820
 821                 DEBUGLEVEL = 10;
 822
 823                 DEBUGSEP(0);
 824                 DEBUG(0,("Abnormal server exit: %s\n",
 825                         reason ? reason : "no explanation provided"));
 826                 DEBUGSEP(0);
 827
 828                 log_stack_trace();
 829
 830                 DEBUGLEVEL = oldlevel;
 831                 dump_core();
 832
 833         } else {
 834                 DEBUG(3,("Server exit (%s)\n",
 835                         (reason ? reason : "normal exit")));
 836         }
 837
 838         exit(0);
 839 }
 840
 841 void exit_server(const char *const explanation)
 842 {
 843         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 844 }
 845
 846 void exit_server_cleanly(const char *const explanation)
 847 {
 848         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 849 }
 850
 851 void exit_server_fault(void)
 852 {
 853         exit_server("critical server fault");
 854 }
 855
 856 /****************************************************************************
 857  Initialise connect, service and file structs.
 858 ****************************************************************************/
 859
 860 static bool init_structs(void )
 861 {
 862         /*
 863          * Set the machine NETBIOS name if not already
 864          * set from the config file.
 865          */
 866
 867         if (!init_names())
 868                 return False;
 869
 870         conn_init();
 871
 872         file_init();
 873
 874         /* for RPC pipes */
 875         init_rpc_pipe_hnd();
 876
 877         init_dptrs();
 878
 879         secrets_init();
 880
 881         return True;
 882 }
 883
 884 /*
 885  * Send keepalive packets to our client
 886  */
 887 static bool keepalive_fn(const struct timeval *now, void *private_data)
 888 {
 889         if (!send_keepalive(smbd_server_fd())) {
 890                 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
 891                 return False;
 892         }
 893         return True;
 894 }
 895
 896 /*
 897  * Do the recurring check if we're idle
 898  */
 899 static bool deadtime_fn(const struct timeval *now, void *private_data)
 900 {
 901         if ((conn_num_open() == 0)
 902             || (conn_idle_all(now->tv_sec))) {
 903                 DEBUG( 2, ( "Closing idle connection\n" ) );
 904                 messaging_send(smbd_messaging_context(), procid_self(),
 905                                MSG_SHUTDOWN, &data_blob_null);
 906                 return False;
 907         }
 908
 909         return True;
 910 }
 911
 912
 913 /****************************************************************************
 914  main program.
 915 ****************************************************************************/
 916
 917 /* Declare prototype for build_options() to avoid having to run it through
 918    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 919    prototype generation system is too complicated. */
 920
 921 extern void build_options(bool screen);
 922
 923  int main(int argc,const char *argv[])
 924 {
 925         /* shall I run as a daemon */
 926         static bool is_daemon = False;
 927         static bool interactive = False;
 928         static bool Fork = True;
 929         static bool no_process_group = False;
 930         static bool log_stdout = False;
 931         static char *ports = NULL;
 932         static char *profile_level = NULL;
 933         int opt;
 934         poptContext pc;
 935         bool print_build_options = False;
 936         enum {
 937                 OPT_DAEMON = 1000,
 938                 OPT_INTERACTIVE,
 939                 OPT_FORK,
 940                 OPT_NO_PROCESS_GROUP,
 941                 OPT_LOG_STDOUT
 942         };
 943         struct poptOption long_options[] = {
 944         POPT_AUTOHELP
 945         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 946         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 947         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 948         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 949         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 950         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 951         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 952         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 953         POPT_COMMON_SAMBA
 954         POPT_COMMON_DYNCONFIG
 955         POPT_TABLEEND
 956         };
 957         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 958
 959         load_case_tables();
 960
 961         TimeInit();
 962
 963 #ifdef HAVE_SET_AUTH_PARAMETERS
 964         set_auth_parameters(argc,argv);
 965 #endif
 966
 967         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 968         while((opt = poptGetNextOpt(pc)) != -1) {
 969                 switch (opt)  {
 970                 case OPT_DAEMON:
 971                         is_daemon = true;
 972                         break;
 973                 case OPT_INTERACTIVE:
 974                         interactive = true;
 975                         break;
 976                 case OPT_FORK:
 977                         Fork = false;
 978                         break;
 979                 case OPT_NO_PROCESS_GROUP:
 980                         no_process_group = true;
 981                         break;
 982                 case OPT_LOG_STDOUT:
 983                         log_stdout = true;
 984                         break;
 985                 case 'b':
 986                         print_build_options = True;
 987                         break;
 988                 default:
 989                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 990                                   poptBadOption(pc, 0), poptStrerror(opt));
 991                         poptPrintUsage(pc, stderr, 0);
 992                         exit(1);
 993                 }
 994         }
 995         poptFreeContext(pc);
 996
 997         if (print_build_options) {
 998                 build_options(True); /* Display output to screen as well as debug */
 999                 exit(0);
1000         }
1001
1002 #ifdef HAVE_SETLUID
1003         /* needed for SecureWare on SCO */
1004         setluid(0);
1005 #endif
1006
1007         sec_init();
1008
1009         set_remote_machine_name("smbd", False);
1010
1011         if (interactive) {
1012                 Fork = False;
1013                 log_stdout = True;
1014         }
1015
1016         if (interactive && (DEBUGLEVEL >= 9)) {
1017                 talloc_enable_leak_report();
1018         }
1019
1020         if (log_stdout && Fork) {
1021                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1022                 exit(1);
1023         }
1024
1025         setup_logging(argv[0],log_stdout);
1026
1027         /* we want to re-seed early to prevent time delays causing
1028            client problems at a later date. (tridge) */
1029         generate_random_buffer(NULL, 0);
1030
1031         /* make absolutely sure we run as root - to handle cases where people
1032            are crazy enough to have it setuid */
1033
1034         gain_root_privilege();
1035         gain_root_group_privilege();
1036
1037         fault_setup((void (*)(void *))exit_server_fault);
1038         dump_core_setup("smbd");
1039
1040         CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
1041         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
1042
1043         /* we are never interested in SIGPIPE */
1044         BlockSignals(True,SIGPIPE);
1045
1046 #if defined(SIGFPE)
1047         /* we are never interested in SIGFPE */
1048         BlockSignals(True,SIGFPE);
1049 #endif
1050
1051 #if defined(SIGUSR2)
1052         /* We are no longer interested in USR2 */
1053         BlockSignals(True,SIGUSR2);
1054 #endif
1055
1056         /* POSIX demands that signals are inherited. If the invoking process has
1057          * these signals masked, we will have problems, as we won't recieve them. */
1058         BlockSignals(False, SIGHUP);
1059         BlockSignals(False, SIGUSR1);
1060         BlockSignals(False, SIGTERM);
1061
1062         /* we want total control over the permissions on created files,
1063            so set our umask to 0 */
1064         umask(0);
1065
1066         init_sec_ctx();
1067
1068         reopen_logs();
1069
1070         DEBUG(0,("smbd version %s started.\n", SAMBA_VERSION_STRING));
1071         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1072
1073         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1074                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1075
1076         /* Output the build options to the debug log */
1077         build_options(False);
1078
1079         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1080                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1081                 exit(1);
1082         }
1083
1084         /*
1085          * Do this before reload_services.
1086          */
1087
1088         if (!reload_services(False))
1089                 return(-1);
1090
1091         init_structs();
1092
1093 #ifdef WITH_PROFILE
1094         if (!profile_setup(smbd_messaging_context(), False)) {
1095                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1096                 return -1;
1097         }
1098         if (profile_level != NULL) {
1099                 int pl = atoi(profile_level);
1100                 struct server_id src;
1101
1102                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1103                 src.pid = getpid();
1104                 set_profile_level(pl, src);
1105         }
1106 #endif
1107
1108         DEBUG(3,( "loaded services\n"));
1109
1110         if (!is_daemon && !is_a_socket(0)) {
1111                 if (!interactive)
1112                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1113
1114                 /*
1115                  * Setting is_daemon here prevents us from eventually calling
1116                  * the open_sockets_inetd()
1117                  */
1118
1119                 is_daemon = True;
1120         }
1121
1122         if (is_daemon && !interactive) {
1123                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1124                 become_daemon(Fork, no_process_group);
1125         }
1126
1127 #if HAVE_SETPGID
1128         /*
1129          * If we're interactive we want to set our own process group for
1130          * signal management.
1131          */
1132         if (interactive && !no_process_group)
1133                 setpgid( (pid_t)0, (pid_t)0);
1134 #endif
1135
1136         if (!directory_exist(lp_lockdir(), NULL))
1137                 mkdir(lp_lockdir(), 0755);
1138
1139         if (is_daemon)
1140                 pidfile_create("smbd");
1141
1142         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1143
1144         if (smbd_messaging_context() == NULL)
1145                 exit(1);
1146
1147         /* Initialise the password backed before the global_sam_sid
1148            to ensure that we fetch from ldap before we make a domain sid up */
1149
1150         if(!initialize_password_db(False, smbd_event_context()))
1151                 exit(1);
1152
1153         if (!secrets_init()) {
1154                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1155                 exit(1);
1156         }
1157
1158         if(!get_global_sam_sid()) {
1159                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1160                 exit(1);
1161         }
1162
1163         if (!session_init())
1164                 exit(1);
1165
1166         if (!connections_init(True))
1167                 exit(1);
1168
1169         if (!locking_init(0))
1170                 exit(1);
1171
1172         namecache_enable();
1173
1174         if (!init_registry())
1175                 exit(1);
1176
1177 #if 0
1178         if (!init_svcctl_db())
1179                 exit(1);
1180 #endif
1181
1182         if (!print_backend_init(smbd_messaging_context()))
1183                 exit(1);
1184
1185         if (!init_guest_info()) {
1186                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1187                 return -1;
1188         }
1189
1190         /* only start the background queue daemon if we are
1191            running as a daemon -- bad things will happen if
1192            smbd is launched via inetd and we fork a copy of
1193            ourselves here */
1194
1195         if ( is_daemon && !interactive )
1196                 start_background_queue();
1197
1198         /* Always attempt to initialize DMAPI. We will only use it later if
1199          * lp_dmapi_support is set on the share, but we need a single global
1200          * session to work with.
1201          */
1202         dmapi_init_session();
1203
1204         if (!open_sockets_smbd(is_daemon, interactive, ports))
1205                 exit(1);
1206
1207         /*
1208          * everything after this point is run after the fork()
1209          */
1210
1211         static_init_rpc;
1212
1213         init_modules();
1214
1215         /* Possibly reload the services file. Only worth doing in
1216          * daemon mode. In inetd mode, we know we only just loaded this.
1217          */
1218         if (is_daemon) {
1219                 reload_services(True);
1220         }
1221
1222         if (!init_account_policy()) {
1223                 DEBUG(0,("Could not open account policy tdb.\n"));
1224                 exit(1);
1225         }
1226
1227         if (*lp_rootdir()) {
1228                 if (sys_chroot(lp_rootdir()) == 0)
1229                         DEBUG(2,("Changed root to %s\n", lp_rootdir()));
1230         }
1231
1232         /* Setup oplocks */
1233         if (!init_oplocks(smbd_messaging_context()))
1234                 exit(1);
1235
1236         /* Setup aio signal handler. */
1237         initialize_async_io_handler();
1238
1239         /*
1240          * For clustering, we need to re-init our ctdbd connection after the
1241          * fork
1242          */
1243         if (!NT_STATUS_IS_OK(messaging_reinit(smbd_messaging_context())))
1244                 exit(1);
1245
1246         /* register our message handlers */
1247         messaging_register(smbd_messaging_context(), NULL,
1248                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
1249
1250         if ((lp_keepalive() != 0)
1251             && !(event_add_idle(smbd_event_context(), NULL,
1252                                 timeval_set(lp_keepalive(), 0),
1253                                 "keepalive", keepalive_fn,
1254                                 NULL))) {
1255                 DEBUG(0, ("Could not add keepalive event\n"));
1256                 exit(1);
1257         }
1258
1259         if (!(event_add_idle(smbd_event_context(), NULL,
1260                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
1261                              "deadtime", deadtime_fn, NULL))) {
1262                 DEBUG(0, ("Could not add deadtime event\n"));
1263                 exit(1);
1264         }
1265
1266         TALLOC_FREE(frame);
1267
1268         smbd_process();
1269
1270         namecache_shutdown();
1271
1272         exit_server_cleanly(NULL);
1273         return(0);
1274 }