source3/smbd/server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Main SMB server routines
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) Martin Pool                    2002
   6    Copyright (C) Jelmer Vernooij                2002-2003
   7    Copyright (C) Volker Lendecke                1993-2007
   8    Copyright (C) Jeremy Allison                 1993-2007
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "smbd/globals.h"
  26
  27 static_decl_rpc;
  28
  29 #ifdef WITH_DFS
  30 extern int dcelogin_atmost_once;
  31 #endif /* WITH_DFS */
  32
  33 int smbd_server_fd(void)
  34 {
  35         return server_fd;
  36 }
  37
  38 static void smbd_set_server_fd(int fd)
  39 {
  40         server_fd = fd;
  41 }
  42
  43 int get_client_fd(void)
  44 {
  45         return server_fd;
  46 }
  47
  48 struct event_context *smbd_event_context(void)
  49 {
  50         if (!smbd_event_ctx) {
  51                 smbd_event_ctx = event_context_init(talloc_autofree_context());
  52         }
  53         if (!smbd_event_ctx) {
  54                 smb_panic("Could not init smbd event context");
  55         }
  56         return smbd_event_ctx;
  57 }
  58
  59 struct messaging_context *smbd_messaging_context(void)
  60 {
  61         if (smbd_msg_ctx == NULL) {
  62                 smbd_msg_ctx = messaging_init(talloc_autofree_context(),
  63                                               server_id_self(),
  64                                               smbd_event_context());
  65         }
  66         if (smbd_msg_ctx == NULL) {
  67                 DEBUG(0, ("Could not init smbd messaging context.\n"));
  68         }
  69         return smbd_msg_ctx;
  70 }
  71
  72 struct memcache *smbd_memcache(void)
  73 {
  74         if (!smbd_memcache_ctx) {
  75                 smbd_memcache_ctx = memcache_init(talloc_autofree_context(),
  76                                                   lp_max_stat_cache_size()*1024);
  77         }
  78         if (!smbd_memcache_ctx) {
  79                 smb_panic("Could not init smbd memcache");
  80         }
  81
  82         return smbd_memcache_ctx;
  83 }
  84
  85 /*******************************************************************
  86  What to do when smb.conf is updated.
  87  ********************************************************************/
  88
  89 static void smb_conf_updated(struct messaging_context *msg,
  90                              void *private_data,
  91                              uint32_t msg_type,
  92                              struct server_id server_id,
  93                              DATA_BLOB *data)
  94 {
  95         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
  96                   "updated. Reloading.\n"));
  97         reload_services(False);
  98 }
  99
 100
 101 /*******************************************************************
 102  Delete a statcache entry.
 103  ********************************************************************/
 104
 105 static void smb_stat_cache_delete(struct messaging_context *msg,
 106                                   void *private_data,
 107                                   uint32_t msg_tnype,
 108                                   struct server_id server_id,
 109                                   DATA_BLOB *data)
 110 {
 111         const char *name = (const char *)data->data;
 112         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 113         stat_cache_delete(name);
 114 }
 115
 116 /****************************************************************************
 117   Send a SIGTERM to our process group.
 118 *****************************************************************************/
 119
 120 static void  killkids(void)
 121 {
 122         if(am_parent) kill(0,SIGTERM);
 123 }
 124
 125 /****************************************************************************
 126  Process a sam sync message - not sure whether to do this here or
 127  somewhere else.
 128 ****************************************************************************/
 129
 130 static void msg_sam_sync(struct messaging_context *msg,
 131                          void *private_data,
 132                          uint32_t msg_type,
 133                          struct server_id server_id,
 134                          DATA_BLOB *data)
 135 {
 136         DEBUG(10, ("** sam sync message received, ignoring\n"));
 137 }
 138
 139
 140 /****************************************************************************
 141  Open the socket communication - inetd.
 142 ****************************************************************************/
 143
 144 static bool open_sockets_inetd(void)
 145 {
 146         /* Started from inetd. fd 0 is the socket. */
 147         /* We will abort gracefully when the client or remote system
 148            goes away */
 149         smbd_set_server_fd(dup(0));
 150
 151         /* close our standard file descriptors */
 152         close_low_fds(False); /* Don't close stderr */
 153
 154         return True;
 155 }
 156
 157 static void msg_exit_server(struct messaging_context *msg,
 158                             void *private_data,
 159                             uint32_t msg_type,
 160                             struct server_id server_id,
 161                             DATA_BLOB *data)
 162 {
 163         DEBUG(3, ("got a SHUTDOWN message\n"));
 164         exit_server_cleanly(NULL);
 165 }
 166
 167 #ifdef DEVELOPER
 168 static void msg_inject_fault(struct messaging_context *msg,
 169                              void *private_data,
 170                              uint32_t msg_type,
 171                              struct server_id src,
 172                              DATA_BLOB *data)
 173 {
 174         int sig;
 175
 176         if (data->length != sizeof(sig)) {
 177
 178                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 179                           procid_str_static(&src)));
 180                 return;
 181         }
 182
 183         sig = *(int *)data->data;
 184         if (sig == -1) {
 185                 exit_server("internal error injected");
 186                 return;
 187         }
 188
 189 #if HAVE_STRSIGNAL
 190         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 191                   procid_str_static(&src), sig, strsignal(sig)));
 192 #else
 193         DEBUG(0, ("Process %s requested injection of signal %d\n",
 194                   procid_str_static(&src), sig));
 195 #endif
 196
 197         kill(sys_getpid(), sig);
 198 }
 199 #endif /* DEVELOPER */
 200
 201 struct child_pid {
 202         struct child_pid *prev, *next;
 203         pid_t pid;
 204 };
 205
 206 static void add_child_pid(pid_t pid)
 207 {
 208         struct child_pid *child;
 209
 210         if (lp_max_smbd_processes() == 0) {
 211                 /* Don't bother with the child list if we don't care anyway */
 212                 return;
 213         }
 214
 215         child = SMB_MALLOC_P(struct child_pid);
 216         if (child == NULL) {
 217                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 218                 return;
 219         }
 220         child->pid = pid;
 221         DLIST_ADD(children, child);
 222         num_children += 1;
 223 }
 224
 225 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 226 {
 227         struct child_pid *child;
 228
 229         if (unclean_shutdown) {
 230                 /* a child terminated uncleanly so tickle all processes to see
 231                    if they can grab any of the pending locks
 232                 */
 233                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n", pid));
 234                 messaging_send_buf(smbd_messaging_context(), procid_self(),
 235                                    MSG_SMB_BRL_VALIDATE, NULL, 0);
 236                 message_send_all(smbd_messaging_context(),
 237                                  MSG_SMB_UNLOCK, NULL, 0, NULL);
 238         }
 239
 240         if (lp_max_smbd_processes() == 0) {
 241                 /* Don't bother with the child list if we don't care anyway */
 242                 return;
 243         }
 244
 245         for (child = children; child != NULL; child = child->next) {
 246                 if (child->pid == pid) {
 247                         struct child_pid *tmp = child;
 248                         DLIST_REMOVE(children, child);
 249                         SAFE_FREE(tmp);
 250                         num_children -= 1;
 251                         return;
 252                 }
 253         }
 254
 255         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 256 }
 257
 258 /****************************************************************************
 259  Have we reached the process limit ?
 260 ****************************************************************************/
 261
 262 static bool allowable_number_of_smbd_processes(void)
 263 {
 264         int max_processes = lp_max_smbd_processes();
 265
 266         if (!max_processes)
 267                 return True;
 268
 269         return num_children < max_processes;
 270 }
 271
 272 static void smbd_sig_chld_handler(struct tevent_context *ev,
 273                                   struct tevent_signal *se,
 274                                   int signum,
 275                                   int count,
 276                                   void *siginfo,
 277                                   void *private_data)
 278 {
 279         pid_t pid;
 280         int status;
 281
 282         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 283                 bool unclean_shutdown = False;
 284
 285                 /* If the child terminated normally, assume
 286                    it was an unclean shutdown unless the
 287                    status is 0
 288                 */
 289                 if (WIFEXITED(status)) {
 290                         unclean_shutdown = WEXITSTATUS(status);
 291                 }
 292                 /* If the child terminated due to a signal
 293                    we always assume it was unclean.
 294                 */
 295                 if (WIFSIGNALED(status)) {
 296                         unclean_shutdown = True;
 297                 }
 298                 remove_child_pid(pid, unclean_shutdown);
 299         }
 300 }
 301
 302 static void smbd_setup_sig_chld_handler(void)
 303 {
 304         struct tevent_signal *se;
 305
 306         se = tevent_add_signal(smbd_event_context(),
 307                                smbd_event_context(),
 308                                SIGCHLD, 0,
 309                                smbd_sig_chld_handler,
 310                                NULL);
 311         if (!se) {
 312                 exit_server("failed to setup SIGCHLD handler");
 313         }
 314 }
 315
 316 /****************************************************************************
 317  Open the socket communication.
 318 ****************************************************************************/
 319
 320 static bool open_sockets_smbd(bool is_daemon, bool interactive, const char *smb_ports)
 321 {
 322         int num_interfaces = iface_count();
 323         int num_sockets = 0;
 324         int fd_listenset[FD_SETSIZE];
 325         fd_set listen_set;
 326         int s;
 327         int maxfd = 0;
 328         int i;
 329         char *ports;
 330         struct dns_reg_state * dns_reg = NULL;
 331         unsigned dns_port = 0;
 332
 333         if (!is_daemon) {
 334                 return open_sockets_inetd();
 335         }
 336
 337 #ifdef HAVE_ATEXIT
 338         atexit(killkids);
 339 #endif
 340
 341         /* Stop zombies */
 342         smbd_setup_sig_chld_handler();
 343
 344         FD_ZERO(&listen_set);
 345
 346         /* use a reasonable default set of ports - listing on 445 and 139 */
 347         if (!smb_ports) {
 348                 ports = lp_smb_ports();
 349                 if (!ports || !*ports) {
 350                         ports = smb_xstrdup(SMB_PORTS);
 351                 } else {
 352                         ports = smb_xstrdup(ports);
 353                 }
 354         } else {
 355                 ports = smb_xstrdup(smb_ports);
 356         }
 357
 358         if (lp_interfaces() && lp_bind_interfaces_only()) {
 359                 /* We have been given an interfaces line, and been
 360                    told to only bind to those interfaces. Create a
 361                    socket per interface and bind to only these.
 362                 */
 363
 364                 /* Now open a listen socket for each of the
 365                    interfaces. */
 366                 for(i = 0; i < num_interfaces; i++) {
 367                         TALLOC_CTX *frame = NULL;
 368                         const struct sockaddr_storage *ifss =
 369                                         iface_n_sockaddr_storage(i);
 370                         char *tok;
 371                         const char *ptr;
 372
 373                         if (ifss == NULL) {
 374                                 DEBUG(0,("open_sockets_smbd: "
 375                                         "interface %d has NULL IP address !\n",
 376                                         i));
 377                                 continue;
 378                         }
 379
 380                         frame = talloc_stackframe();
 381                         for (ptr=ports;
 382                                         next_token_talloc(frame,&ptr, &tok, " \t,");) {
 383                                 unsigned port = atoi(tok);
 384                                 if (port == 0 || port > 0xffff) {
 385                                         continue;
 386                                 }
 387
 388                                 /* Keep the first port for mDNS service
 389                                  * registration.
 390                                  */
 391                                 if (dns_port == 0) {
 392                                         dns_port = port;
 393                                 }
 394
 395                                 s = fd_listenset[num_sockets] =
 396                                         open_socket_in(SOCK_STREAM,
 397                                                         port,
 398                                                         num_sockets == 0 ? 0 : 2,
 399                                                         ifss,
 400                                                         true);
 401                                 if(s == -1) {
 402                                         continue;
 403                                 }
 404
 405                                 /* ready to listen */
 406                                 set_socket_options(s,"SO_KEEPALIVE");
 407                                 set_socket_options(s,lp_socket_options());
 408
 409                                 /* Set server socket to
 410                                  * non-blocking for the accept. */
 411                                 set_blocking(s,False);
 412
 413                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 414                                         DEBUG(0,("open_sockets_smbd: listen: "
 415                                                 "%s\n", strerror(errno)));
 416                                         close(s);
 417                                         TALLOC_FREE(frame);
 418                                         return False;
 419                                 }
 420                                 FD_SET(s,&listen_set);
 421                                 maxfd = MAX( maxfd, s);
 422
 423                                 num_sockets++;
 424                                 if (num_sockets >= FD_SETSIZE) {
 425                                         DEBUG(0,("open_sockets_smbd: Too "
 426                                                 "many sockets to bind to\n"));
 427                                         TALLOC_FREE(frame);
 428                                         return False;
 429                                 }
 430                         }
 431                         TALLOC_FREE(frame);
 432                 }
 433         } else {
 434                 /* Just bind to 0.0.0.0 - accept connections
 435                    from anywhere. */
 436
 437                 TALLOC_CTX *frame = talloc_stackframe();
 438                 char *tok;
 439                 const char *ptr;
 440                 const char *sock_addr = lp_socket_address();
 441                 char *sock_tok;
 442                 const char *sock_ptr;
 443
 444                 if (strequal(sock_addr, "0.0.0.0") ||
 445                     strequal(sock_addr, "::")) {
 446 #if HAVE_IPV6
 447                         sock_addr = "::,0.0.0.0";
 448 #else
 449                         sock_addr = "0.0.0.0";
 450 #endif
 451                 }
 452
 453                 for (sock_ptr=sock_addr;
 454                                 next_token_talloc(frame, &sock_ptr, &sock_tok, " \t,"); ) {
 455                         for (ptr=ports; next_token_talloc(frame, &ptr, &tok, " \t,"); ) {
 456                                 struct sockaddr_storage ss;
 457
 458                                 unsigned port = atoi(tok);
 459                                 if (port == 0 || port > 0xffff) {
 460                                         continue;
 461                                 }
 462
 463                                 /* Keep the first port for mDNS service
 464                                  * registration.
 465                                  */
 466                                 if (dns_port == 0) {
 467                                         dns_port = port;
 468                                 }
 469
 470                                 /* open an incoming socket */
 471                                 if (!interpret_string_addr(&ss, sock_tok,
 472                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 473                                         continue;
 474                                 }
 475
 476                                 s = open_socket_in(SOCK_STREAM,
 477                                                 port,
 478                                                 num_sockets == 0 ? 0 : 2,
 479                                                 &ss,
 480                                                 true);
 481                                 if (s == -1) {
 482                                         continue;
 483                                 }
 484
 485                                 /* ready to listen */
 486                                 set_socket_options(s,"SO_KEEPALIVE");
 487                                 set_socket_options(s,lp_socket_options());
 488
 489                                 /* Set server socket to non-blocking
 490                                  * for the accept. */
 491                                 set_blocking(s,False);
 492
 493                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 494                                         DEBUG(0,("open_sockets_smbd: "
 495                                                 "listen: %s\n",
 496                                                  strerror(errno)));
 497                                         close(s);
 498                                         TALLOC_FREE(frame);
 499                                         return False;
 500                                 }
 501
 502                                 fd_listenset[num_sockets] = s;
 503                                 FD_SET(s,&listen_set);
 504                                 maxfd = MAX( maxfd, s);
 505
 506                                 num_sockets++;
 507
 508                                 if (num_sockets >= FD_SETSIZE) {
 509                                         DEBUG(0,("open_sockets_smbd: Too "
 510                                                 "many sockets to bind to\n"));
 511                                         TALLOC_FREE(frame);
 512                                         return False;
 513                                 }
 514                         }
 515                 }
 516                 TALLOC_FREE(frame);
 517         }
 518
 519         SAFE_FREE(ports);
 520
 521         if (num_sockets == 0) {
 522                 DEBUG(0,("open_sockets_smbd: No "
 523                         "sockets available to bind to.\n"));
 524                 return false;
 525         }
 526
 527         /* Setup the main smbd so that we can get messages. Note that
 528            do this after starting listening. This is needed as when in
 529            clustered mode, ctdb won't allow us to start doing database
 530            operations until it has gone thru a full startup, which
 531            includes checking to see that smbd is listening. */
 532         claim_connection(NULL,"",
 533                          FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
 534
 535         /* Listen to messages */
 536
 537         messaging_register(smbd_messaging_context(), NULL,
 538                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 539         messaging_register(smbd_messaging_context(), NULL,
 540                            MSG_SHUTDOWN, msg_exit_server);
 541         messaging_register(smbd_messaging_context(), NULL,
 542                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 543         messaging_register(smbd_messaging_context(), NULL,
 544                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 545         messaging_register(smbd_messaging_context(), NULL,
 546                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 547         brl_register_msgs(smbd_messaging_context());
 548
 549 #ifdef CLUSTER_SUPPORT
 550         if (lp_clustering()) {
 551                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 552         }
 553 #endif
 554
 555 #ifdef DEVELOPER
 556         messaging_register(smbd_messaging_context(), NULL,
 557                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 558 #endif
 559
 560         /* now accept incoming connections - forking a new process
 561            for each incoming connection */
 562         DEBUG(2,("waiting for a connection\n"));
 563         while (1) {
 564                 struct timeval now, idle_timeout;
 565                 fd_set r_fds, w_fds;
 566                 int num;
 567
 568                 if (run_events(smbd_event_context(), 0, NULL, NULL)) {
 569                         continue;
 570                 }
 571
 572                 idle_timeout = timeval_zero();
 573
 574                 memcpy((char *)&r_fds, (char *)&listen_set,
 575                        sizeof(listen_set));
 576                 FD_ZERO(&w_fds);
 577                 GetTimeOfDay(&now);
 578
 579                 /* Kick off our mDNS registration. */
 580                 if (dns_port != 0) {
 581                         dns_register_smbd(&dns_reg, dns_port, &maxfd,
 582                                         &r_fds, &idle_timeout);
 583                 }
 584
 585                 event_add_to_select_args(smbd_event_context(), &now,
 586                                          &r_fds, &w_fds, &idle_timeout,
 587                                          &maxfd);
 588
 589                 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
 590                                  timeval_is_zero(&idle_timeout) ?
 591                                  NULL : &idle_timeout);
 592
 593                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 594                         continue;
 595                 }
 596
 597                 /* If the idle timeout fired and we don't have any connected
 598                  * users, exit gracefully. We should be running under a process
 599                  * controller that will restart us if necessry.
 600                  */
 601                 if (num == 0 && count_all_current_connections() == 0) {
 602                         exit_server_cleanly("idle timeout");
 603                 }
 604
 605                 /* process pending nDNS responses */
 606                 if (dns_register_smbd_reply(dns_reg, &r_fds, &idle_timeout)) {
 607                         --num;
 608                 }
 609
 610                 /* check if we need to reload services */
 611                 check_reload(time(NULL));
 612
 613                 /* Find the sockets that are read-ready -
 614                    accept on these. */
 615                 for( ; num > 0; num--) {
 616                         struct sockaddr addr;
 617                         socklen_t in_addrlen = sizeof(addr);
 618                         pid_t child = 0;
 619
 620                         s = -1;
 621                         for(i = 0; i < num_sockets; i++) {
 622                                 if(FD_ISSET(fd_listenset[i],&r_fds)) {
 623                                         s = fd_listenset[i];
 624                                         /* Clear this so we don't look
 625                                            at it again. */
 626                                         FD_CLR(fd_listenset[i],&r_fds);
 627                                         break;
 628                                 }
 629                         }
 630
 631                         smbd_set_server_fd(accept(s,&addr,&in_addrlen));
 632
 633                         if (smbd_server_fd() == -1 && errno == EINTR)
 634                                 continue;
 635
 636                         if (smbd_server_fd() == -1) {
 637                                 DEBUG(2,("open_sockets_smbd: accept: %s\n",
 638                                          strerror(errno)));
 639                                 continue;
 640                         }
 641
 642                         if (interactive)
 643                                 return True;
 644
 645                         if (allowable_number_of_smbd_processes() &&
 646                             ((child = sys_fork())==0)) {
 647                                 /* Child code ... */
 648
 649                                 /* Stop zombies, the parent explicitly handles
 650                                  * them, counting worker smbds. */
 651                                 CatchChild();
 652
 653                                 /* close the listening socket(s) */
 654                                 for(i = 0; i < num_sockets; i++)
 655                                         close(fd_listenset[i]);
 656
 657                                 /* close our mDNS daemon handle */
 658                                 dns_register_close(&dns_reg);
 659
 660                                 /* close our standard file
 661                                    descriptors */
 662                                 close_low_fds(False);
 663                                 am_parent = 0;
 664
 665                                 if (!reinit_after_fork(
 666                                             smbd_messaging_context(),
 667                                             smbd_event_context(),
 668                                             true)) {
 669                                         DEBUG(0,("reinit_after_fork() failed\n"));
 670                                         smb_panic("reinit_after_fork() failed");
 671                                 }
 672
 673                                 smbd_setup_sig_term_handler();
 674                                 smbd_setup_sig_hup_handler();
 675
 676                                 return True;
 677                         }
 678                         /* The parent doesn't need this socket */
 679                         close(smbd_server_fd());
 680
 681                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 682                                 Clear the closed fd info out of server_fd --
 683                                 and more importantly, out of client_fd in
 684                                 util_sock.c, to avoid a possible
 685                                 getpeername failure if we reopen the logs
 686                                 and use %I in the filename.
 687                         */
 688
 689                         smbd_set_server_fd(-1);
 690
 691                         if (child != 0) {
 692                                 add_child_pid(child);
 693                         }
 694
 695                         /* Force parent to check log size after
 696                          * spawning child.  Fix from
 697                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 698                          * parent smbd will log to logserver.smb.  It
 699                          * writes only two messages for each child
 700                          * started/finished. But each child writes,
 701                          * say, 50 messages also in logserver.smb,
 702                          * begining with the debug_count of the
 703                          * parent, before the child opens its own log
 704                          * file logserver.client. In a worst case
 705                          * scenario the size of logserver.smb would be
 706                          * checked after about 50*50=2500 messages
 707                          * (ca. 100kb).
 708                          * */
 709                         force_check_log_size();
 710
 711                 } /* end for num */
 712         } /* end while 1 */
 713
 714 /* NOTREACHED   return True; */
 715 }
 716
 717 /****************************************************************************
 718  Reload printers
 719 **************************************************************************/
 720 void reload_printers(void)
 721 {
 722         int snum;
 723         int n_services = lp_numservices();
 724         int pnum = lp_servicenumber(PRINTERS_NAME);
 725         const char *pname;
 726
 727         pcap_cache_reload();
 728
 729         /* remove stale printers */
 730         for (snum = 0; snum < n_services; snum++) {
 731                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 732                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 733                                       lp_autoloaded(snum)))
 734                         continue;
 735
 736                 pname = lp_printername(snum);
 737                 if (!pcap_printername_ok(pname)) {
 738                         DEBUG(3, ("removing stale printer %s\n", pname));
 739
 740                         if (is_printer_published(NULL, snum, NULL))
 741                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 742                         del_a_printer(pname);
 743                         lp_killservice(snum);
 744                 }
 745         }
 746
 747         load_printers();
 748 }
 749
 750 /****************************************************************************
 751  Reload the services file.
 752 **************************************************************************/
 753
 754 bool reload_services(bool test)
 755 {
 756         bool ret;
 757
 758         if (lp_loaded()) {
 759                 char *fname = lp_configfile();
 760                 if (file_exist(fname) &&
 761                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 762                         set_dyn_CONFIGFILE(fname);
 763                         test = False;
 764                 }
 765         }
 766
 767         reopen_logs();
 768
 769         if (test && !lp_file_list_changed())
 770                 return(True);
 771
 772         lp_killunused(conn_snum_used);
 773
 774         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 775
 776         reload_printers();
 777
 778         /* perhaps the config filename is now set */
 779         if (!test)
 780                 reload_services(True);
 781
 782         reopen_logs();
 783
 784         load_interfaces();
 785
 786         if (smbd_server_fd() != -1) {
 787                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 788                 set_socket_options(smbd_server_fd(), lp_socket_options());
 789         }
 790
 791         mangle_reset_cache();
 792         reset_stat_cache();
 793
 794         /* this forces service parameters to be flushed */
 795         set_current_service(NULL,0,True);
 796
 797         return(ret);
 798 }
 799
 800 /****************************************************************************
 801  Exit the server.
 802 ****************************************************************************/
 803
 804 /* Reasons for shutting down a server process. */
 805 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 806
 807 static void exit_server_common(enum server_exit_reason how,
 808         const char *const reason) _NORETURN_;
 809
 810 static void exit_server_common(enum server_exit_reason how,
 811         const char *const reason)
 812 {
 813         bool had_open_conn;
 814
 815         if (!exit_firsttime)
 816                 exit(0);
 817         exit_firsttime = false;
 818
 819         change_to_root_user();
 820
 821         if (negprot_global_auth_context) {
 822                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 823         }
 824
 825         had_open_conn = conn_close_all();
 826
 827         invalidate_all_vuids();
 828
 829         /* 3 second timeout. */
 830         print_notify_send_messages(smbd_messaging_context(), 3);
 831
 832         /* delete our entry in the connections database. */
 833         yield_connection(NULL,"");
 834
 835         respond_to_all_remaining_local_messages();
 836
 837 #ifdef WITH_DFS
 838         if (dcelogin_atmost_once) {
 839                 dfs_unlogin();
 840         }
 841 #endif
 842
 843 #ifdef USE_DMAPI
 844         /* Destroy Samba DMAPI session only if we are master smbd process */
 845         if (am_parent) {
 846                 if (!dmapi_destroy_session()) {
 847                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 848                 }
 849         }
 850 #endif
 851
 852         locking_end();
 853         printing_end();
 854
 855         if (how != SERVER_EXIT_NORMAL) {
 856                 int oldlevel = DEBUGLEVEL;
 857
 858                 DEBUGLEVEL = 10;
 859
 860                 DEBUGSEP(0);
 861                 DEBUG(0,("Abnormal server exit: %s\n",
 862                         reason ? reason : "no explanation provided"));
 863                 DEBUGSEP(0);
 864
 865                 log_stack_trace();
 866
 867                 DEBUGLEVEL = oldlevel;
 868                 dump_core();
 869
 870         } else {
 871                 DEBUG(3,("Server exit (%s)\n",
 872                         (reason ? reason : "normal exit")));
 873         }
 874
 875         /* if we had any open SMB connections when we exited then we
 876            need to tell the parent smbd so that it can trigger a retry
 877            of any locks we may have been holding or open files we were
 878            blocking */
 879         if (had_open_conn) {
 880                 exit(1);
 881         } else {
 882                 exit(0);
 883         }
 884 }
 885
 886 void exit_server(const char *const explanation)
 887 {
 888         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 889 }
 890
 891 void exit_server_cleanly(const char *const explanation)
 892 {
 893         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 894 }
 895
 896 void exit_server_fault(void)
 897 {
 898         exit_server("critical server fault");
 899 }
 900
 901 /****************************************************************************
 902  Initialise connect, service and file structs.
 903 ****************************************************************************/
 904
 905 static bool init_structs(void )
 906 {
 907         /*
 908          * Set the machine NETBIOS name if not already
 909          * set from the config file.
 910          */
 911
 912         if (!init_names())
 913                 return False;
 914
 915         conn_init();
 916
 917         file_init();
 918
 919         init_dptrs();
 920
 921         if (!secrets_init())
 922                 return False;
 923
 924         return True;
 925 }
 926
 927 /****************************************************************************
 928  main program.
 929 ****************************************************************************/
 930
 931 /* Declare prototype for build_options() to avoid having to run it through
 932    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 933    prototype generation system is too complicated. */
 934
 935 extern void build_options(bool screen);
 936
 937  int main(int argc,const char *argv[])
 938 {
 939         /* shall I run as a daemon */
 940         bool is_daemon = false;
 941         bool interactive = false;
 942         bool Fork = true;
 943         bool no_process_group = false;
 944         bool log_stdout = false;
 945         char *ports = NULL;
 946         char *profile_level = NULL;
 947         int opt;
 948         poptContext pc;
 949         bool print_build_options = False;
 950         enum {
 951                 OPT_DAEMON = 1000,
 952                 OPT_INTERACTIVE,
 953                 OPT_FORK,
 954                 OPT_NO_PROCESS_GROUP,
 955                 OPT_LOG_STDOUT
 956         };
 957         struct poptOption long_options[] = {
 958         POPT_AUTOHELP
 959         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 960         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 961         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 962         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 963         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 964         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 965         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 966         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 967         POPT_COMMON_SAMBA
 968         POPT_COMMON_DYNCONFIG
 969         POPT_TABLEEND
 970         };
 971         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 972
 973         smbd_init_globals();
 974
 975         TimeInit();
 976
 977 #ifdef HAVE_SET_AUTH_PARAMETERS
 978         set_auth_parameters(argc,argv);
 979 #endif
 980
 981         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 982         while((opt = poptGetNextOpt(pc)) != -1) {
 983                 switch (opt)  {
 984                 case OPT_DAEMON:
 985                         is_daemon = true;
 986                         break;
 987                 case OPT_INTERACTIVE:
 988                         interactive = true;
 989                         break;
 990                 case OPT_FORK:
 991                         Fork = false;
 992                         break;
 993                 case OPT_NO_PROCESS_GROUP:
 994                         no_process_group = true;
 995                         break;
 996                 case OPT_LOG_STDOUT:
 997                         log_stdout = true;
 998                         break;
 999                 case 'b':
1000                         print_build_options = True;
1001                         break;
1002                 default:
1003                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1004                                   poptBadOption(pc, 0), poptStrerror(opt));
1005                         poptPrintUsage(pc, stderr, 0);
1006                         exit(1);
1007                 }
1008         }
1009         poptFreeContext(pc);
1010
1011         if (interactive) {
1012                 Fork = False;
1013                 log_stdout = True;
1014         }
1015
1016         setup_logging(argv[0],log_stdout);
1017
1018         if (print_build_options) {
1019                 build_options(True); /* Display output to screen as well as debug */
1020                 exit(0);
1021         }
1022
1023         load_case_tables();
1024
1025 #ifdef HAVE_SETLUID
1026         /* needed for SecureWare on SCO */
1027         setluid(0);
1028 #endif
1029
1030         sec_init();
1031
1032         set_remote_machine_name("smbd", False);
1033
1034         if (interactive && (DEBUGLEVEL >= 9)) {
1035                 talloc_enable_leak_report();
1036         }
1037
1038         if (log_stdout && Fork) {
1039                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1040                 exit(1);
1041         }
1042
1043         /* we want to re-seed early to prevent time delays causing
1044            client problems at a later date. (tridge) */
1045         generate_random_buffer(NULL, 0);
1046
1047         /* make absolutely sure we run as root - to handle cases where people
1048            are crazy enough to have it setuid */
1049
1050         gain_root_privilege();
1051         gain_root_group_privilege();
1052
1053         fault_setup((void (*)(void *))exit_server_fault);
1054         dump_core_setup("smbd");
1055
1056         /* we are never interested in SIGPIPE */
1057         BlockSignals(True,SIGPIPE);
1058
1059 #if defined(SIGFPE)
1060         /* we are never interested in SIGFPE */
1061         BlockSignals(True,SIGFPE);
1062 #endif
1063
1064 #if defined(SIGUSR2)
1065         /* We are no longer interested in USR2 */
1066         BlockSignals(True,SIGUSR2);
1067 #endif
1068
1069         /* POSIX demands that signals are inherited. If the invoking process has
1070          * these signals masked, we will have problems, as we won't recieve them. */
1071         BlockSignals(False, SIGHUP);
1072         BlockSignals(False, SIGUSR1);
1073         BlockSignals(False, SIGTERM);
1074
1075         /* we want total control over the permissions on created files,
1076            so set our umask to 0 */
1077         umask(0);
1078
1079         init_sec_ctx();
1080
1081         reopen_logs();
1082
1083         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1084         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1085
1086         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1087                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1088
1089         /* Output the build options to the debug log */
1090         build_options(False);
1091
1092         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1093                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1094                 exit(1);
1095         }
1096
1097         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1098                 DEBUG(0, ("error opening config file\n"));
1099                 exit(1);
1100         }
1101
1102         if (smbd_messaging_context() == NULL)
1103                 exit(1);
1104
1105         if (!reload_services(False))
1106                 return(-1);
1107
1108         init_structs();
1109
1110 #ifdef WITH_PROFILE
1111         if (!profile_setup(smbd_messaging_context(), False)) {
1112                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1113                 return -1;
1114         }
1115         if (profile_level != NULL) {
1116                 int pl = atoi(profile_level);
1117                 struct server_id src;
1118
1119                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1120                 src.pid = getpid();
1121                 set_profile_level(pl, src);
1122         }
1123 #endif
1124
1125         DEBUG(3,( "loaded services\n"));
1126
1127         if (!is_daemon && !is_a_socket(0)) {
1128                 if (!interactive)
1129                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1130
1131                 /*
1132                  * Setting is_daemon here prevents us from eventually calling
1133                  * the open_sockets_inetd()
1134                  */
1135
1136                 is_daemon = True;
1137         }
1138
1139         if (is_daemon && !interactive) {
1140                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1141                 become_daemon(Fork, no_process_group);
1142         }
1143
1144 #if HAVE_SETPGID
1145         /*
1146          * If we're interactive we want to set our own process group for
1147          * signal management.
1148          */
1149         if (interactive && !no_process_group)
1150                 setpgid( (pid_t)0, (pid_t)0);
1151 #endif
1152
1153         if (!directory_exist(lp_lockdir()))
1154                 mkdir(lp_lockdir(), 0755);
1155
1156         if (is_daemon)
1157                 pidfile_create("smbd");
1158
1159         if (!reinit_after_fork(smbd_messaging_context(),
1160                                smbd_event_context(), false)) {
1161                 DEBUG(0,("reinit_after_fork() failed\n"));
1162                 exit(1);
1163         }
1164
1165         smbd_setup_sig_term_handler();
1166         smbd_setup_sig_hup_handler();
1167
1168         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1169
1170         if (smbd_memcache() == NULL) {
1171                 exit(1);
1172         }
1173
1174         memcache_set_global(smbd_memcache());
1175
1176         /* Initialise the password backed before the global_sam_sid
1177            to ensure that we fetch from ldap before we make a domain sid up */
1178
1179         if(!initialize_password_db(False, smbd_event_context()))
1180                 exit(1);
1181
1182         if (!secrets_init()) {
1183                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1184                 exit(1);
1185         }
1186
1187         if(!get_global_sam_sid()) {
1188                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1189                 exit(1);
1190         }
1191
1192         if (!session_init())
1193                 exit(1);
1194
1195         if (!connections_init(True))
1196                 exit(1);
1197
1198         if (!locking_init())
1199                 exit(1);
1200
1201         namecache_enable();
1202
1203         if (!W_ERROR_IS_OK(registry_init_full()))
1204                 exit(1);
1205
1206 #if 0
1207         if (!init_svcctl_db())
1208                 exit(1);
1209 #endif
1210
1211         if (!print_backend_init(smbd_messaging_context()))
1212                 exit(1);
1213
1214         if (!init_guest_info()) {
1215                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1216                 return -1;
1217         }
1218
1219         /* only start the background queue daemon if we are
1220            running as a daemon -- bad things will happen if
1221            smbd is launched via inetd and we fork a copy of
1222            ourselves here */
1223
1224         if (is_daemon && !interactive
1225             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1226                 start_background_queue();
1227         }
1228
1229         if (!open_sockets_smbd(is_daemon, interactive, ports))
1230                 exit(1);
1231
1232         TALLOC_FREE(frame);
1233
1234         smbd_process();
1235
1236         exit_server_cleanly(NULL);
1237         return(0);
1238 }