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 #ifdef WITH_DFS
 836         if (dcelogin_atmost_once) {
 837                 dfs_unlogin();
 838         }
 839 #endif
 840
 841 #ifdef USE_DMAPI
 842         /* Destroy Samba DMAPI session only if we are master smbd process */
 843         if (am_parent) {
 844                 if (!dmapi_destroy_session()) {
 845                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 846                 }
 847         }
 848 #endif
 849
 850         locking_end();
 851         printing_end();
 852
 853         if (how != SERVER_EXIT_NORMAL) {
 854                 int oldlevel = DEBUGLEVEL;
 855
 856                 DEBUGLEVEL = 10;
 857
 858                 DEBUGSEP(0);
 859                 DEBUG(0,("Abnormal server exit: %s\n",
 860                         reason ? reason : "no explanation provided"));
 861                 DEBUGSEP(0);
 862
 863                 log_stack_trace();
 864
 865                 DEBUGLEVEL = oldlevel;
 866                 dump_core();
 867
 868         } else {
 869                 DEBUG(3,("Server exit (%s)\n",
 870                         (reason ? reason : "normal exit")));
 871         }
 872
 873         /* if we had any open SMB connections when we exited then we
 874            need to tell the parent smbd so that it can trigger a retry
 875            of any locks we may have been holding or open files we were
 876            blocking */
 877         if (had_open_conn) {
 878                 exit(1);
 879         } else {
 880                 exit(0);
 881         }
 882 }
 883
 884 void exit_server(const char *const explanation)
 885 {
 886         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 887 }
 888
 889 void exit_server_cleanly(const char *const explanation)
 890 {
 891         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 892 }
 893
 894 void exit_server_fault(void)
 895 {
 896         exit_server("critical server fault");
 897 }
 898
 899 /****************************************************************************
 900  Initialise connect, service and file structs.
 901 ****************************************************************************/
 902
 903 static bool init_structs(void )
 904 {
 905         /*
 906          * Set the machine NETBIOS name if not already
 907          * set from the config file.
 908          */
 909
 910         if (!init_names())
 911                 return False;
 912
 913         conn_init();
 914
 915         file_init();
 916
 917         init_dptrs();
 918
 919         if (!secrets_init())
 920                 return False;
 921
 922         return True;
 923 }
 924
 925 /****************************************************************************
 926  main program.
 927 ****************************************************************************/
 928
 929 /* Declare prototype for build_options() to avoid having to run it through
 930    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 931    prototype generation system is too complicated. */
 932
 933 extern void build_options(bool screen);
 934
 935  int main(int argc,const char *argv[])
 936 {
 937         /* shall I run as a daemon */
 938         bool is_daemon = false;
 939         bool interactive = false;
 940         bool Fork = true;
 941         bool no_process_group = false;
 942         bool log_stdout = false;
 943         char *ports = NULL;
 944         char *profile_level = NULL;
 945         int opt;
 946         poptContext pc;
 947         bool print_build_options = False;
 948         enum {
 949                 OPT_DAEMON = 1000,
 950                 OPT_INTERACTIVE,
 951                 OPT_FORK,
 952                 OPT_NO_PROCESS_GROUP,
 953                 OPT_LOG_STDOUT
 954         };
 955         struct poptOption long_options[] = {
 956         POPT_AUTOHELP
 957         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 958         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 959         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 960         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 961         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 962         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 963         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 964         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 965         POPT_COMMON_SAMBA
 966         POPT_COMMON_DYNCONFIG
 967         POPT_TABLEEND
 968         };
 969         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 970
 971         smbd_init_globals();
 972
 973         TimeInit();
 974
 975 #ifdef HAVE_SET_AUTH_PARAMETERS
 976         set_auth_parameters(argc,argv);
 977 #endif
 978
 979         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 980         while((opt = poptGetNextOpt(pc)) != -1) {
 981                 switch (opt)  {
 982                 case OPT_DAEMON:
 983                         is_daemon = true;
 984                         break;
 985                 case OPT_INTERACTIVE:
 986                         interactive = true;
 987                         break;
 988                 case OPT_FORK:
 989                         Fork = false;
 990                         break;
 991                 case OPT_NO_PROCESS_GROUP:
 992                         no_process_group = true;
 993                         break;
 994                 case OPT_LOG_STDOUT:
 995                         log_stdout = true;
 996                         break;
 997                 case 'b':
 998                         print_build_options = True;
 999                         break;
1000                 default:
1001                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1002                                   poptBadOption(pc, 0), poptStrerror(opt));
1003                         poptPrintUsage(pc, stderr, 0);
1004                         exit(1);
1005                 }
1006         }
1007         poptFreeContext(pc);
1008
1009         if (interactive) {
1010                 Fork = False;
1011                 log_stdout = True;
1012         }
1013
1014         setup_logging(argv[0],log_stdout);
1015
1016         if (print_build_options) {
1017                 build_options(True); /* Display output to screen as well as debug */
1018                 exit(0);
1019         }
1020
1021         load_case_tables();
1022
1023 #ifdef HAVE_SETLUID
1024         /* needed for SecureWare on SCO */
1025         setluid(0);
1026 #endif
1027
1028         sec_init();
1029
1030         set_remote_machine_name("smbd", False);
1031
1032         if (interactive && (DEBUGLEVEL >= 9)) {
1033                 talloc_enable_leak_report();
1034         }
1035
1036         if (log_stdout && Fork) {
1037                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1038                 exit(1);
1039         }
1040
1041         /* we want to re-seed early to prevent time delays causing
1042            client problems at a later date. (tridge) */
1043         generate_random_buffer(NULL, 0);
1044
1045         /* make absolutely sure we run as root - to handle cases where people
1046            are crazy enough to have it setuid */
1047
1048         gain_root_privilege();
1049         gain_root_group_privilege();
1050
1051         fault_setup((void (*)(void *))exit_server_fault);
1052         dump_core_setup("smbd");
1053
1054         /* we are never interested in SIGPIPE */
1055         BlockSignals(True,SIGPIPE);
1056
1057 #if defined(SIGFPE)
1058         /* we are never interested in SIGFPE */
1059         BlockSignals(True,SIGFPE);
1060 #endif
1061
1062 #if defined(SIGUSR2)
1063         /* We are no longer interested in USR2 */
1064         BlockSignals(True,SIGUSR2);
1065 #endif
1066
1067         /* POSIX demands that signals are inherited. If the invoking process has
1068          * these signals masked, we will have problems, as we won't recieve them. */
1069         BlockSignals(False, SIGHUP);
1070         BlockSignals(False, SIGUSR1);
1071         BlockSignals(False, SIGTERM);
1072
1073         /* we want total control over the permissions on created files,
1074            so set our umask to 0 */
1075         umask(0);
1076
1077         init_sec_ctx();
1078
1079         reopen_logs();
1080
1081         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1082         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1083
1084         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1085                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1086
1087         /* Output the build options to the debug log */
1088         build_options(False);
1089
1090         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1091                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1092                 exit(1);
1093         }
1094
1095         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1096                 DEBUG(0, ("error opening config file\n"));
1097                 exit(1);
1098         }
1099
1100         if (smbd_messaging_context() == NULL)
1101                 exit(1);
1102
1103         if (!reload_services(False))
1104                 return(-1);
1105
1106         init_structs();
1107
1108 #ifdef WITH_PROFILE
1109         if (!profile_setup(smbd_messaging_context(), False)) {
1110                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1111                 return -1;
1112         }
1113         if (profile_level != NULL) {
1114                 int pl = atoi(profile_level);
1115                 struct server_id src;
1116
1117                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1118                 src.pid = getpid();
1119                 set_profile_level(pl, src);
1120         }
1121 #endif
1122
1123         DEBUG(3,( "loaded services\n"));
1124
1125         if (!is_daemon && !is_a_socket(0)) {
1126                 if (!interactive)
1127                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1128
1129                 /*
1130                  * Setting is_daemon here prevents us from eventually calling
1131                  * the open_sockets_inetd()
1132                  */
1133
1134                 is_daemon = True;
1135         }
1136
1137         if (is_daemon && !interactive) {
1138                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1139                 become_daemon(Fork, no_process_group);
1140         }
1141
1142 #if HAVE_SETPGID
1143         /*
1144          * If we're interactive we want to set our own process group for
1145          * signal management.
1146          */
1147         if (interactive && !no_process_group)
1148                 setpgid( (pid_t)0, (pid_t)0);
1149 #endif
1150
1151         if (!directory_exist(lp_lockdir()))
1152                 mkdir(lp_lockdir(), 0755);
1153
1154         if (is_daemon)
1155                 pidfile_create("smbd");
1156
1157         if (!reinit_after_fork(smbd_messaging_context(),
1158                                smbd_event_context(), false)) {
1159                 DEBUG(0,("reinit_after_fork() failed\n"));
1160                 exit(1);
1161         }
1162
1163         smbd_setup_sig_term_handler();
1164         smbd_setup_sig_hup_handler();
1165
1166         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1167
1168         if (smbd_memcache() == NULL) {
1169                 exit(1);
1170         }
1171
1172         memcache_set_global(smbd_memcache());
1173
1174         /* Initialise the password backed before the global_sam_sid
1175            to ensure that we fetch from ldap before we make a domain sid up */
1176
1177         if(!initialize_password_db(False, smbd_event_context()))
1178                 exit(1);
1179
1180         if (!secrets_init()) {
1181                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1182                 exit(1);
1183         }
1184
1185         if(!get_global_sam_sid()) {
1186                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1187                 exit(1);
1188         }
1189
1190         if (!session_init())
1191                 exit(1);
1192
1193         if (!connections_init(True))
1194                 exit(1);
1195
1196         if (!locking_init())
1197                 exit(1);
1198
1199         namecache_enable();
1200
1201         if (!W_ERROR_IS_OK(registry_init_full()))
1202                 exit(1);
1203
1204 #if 0
1205         if (!init_svcctl_db())
1206                 exit(1);
1207 #endif
1208
1209         if (!print_backend_init(smbd_messaging_context()))
1210                 exit(1);
1211
1212         if (!init_guest_info()) {
1213                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1214                 return -1;
1215         }
1216
1217         /* only start the background queue daemon if we are
1218            running as a daemon -- bad things will happen if
1219            smbd is launched via inetd and we fork a copy of
1220            ourselves here */
1221
1222         if (is_daemon && !interactive
1223             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1224                 start_background_queue();
1225         }
1226
1227         if (!open_sockets_smbd(is_daemon, interactive, ports))
1228                 exit(1);
1229
1230         TALLOC_FREE(frame);
1231
1232         smbd_process();
1233
1234         exit_server_cleanly(NULL);
1235         return(0);
1236 }