source3/smbd/server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Main SMB server routines
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) Martin Pool                    2002
   6    Copyright (C) Jelmer Vernooij                2002-2003
   7    Copyright (C) Volker Lendecke                1993-2007
   8    Copyright (C) Jeremy Allison                 1993-2007
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25
  26 static_decl_rpc;
  27
  28 static int am_parent = 1;
  29
  30 extern struct auth_context *negprot_global_auth_context;
  31 extern SIG_ATOMIC_T got_sig_term;
  32 extern SIG_ATOMIC_T reload_after_sighup;
  33 static SIG_ATOMIC_T got_sig_cld;
  34
  35 #ifdef WITH_DFS
  36 extern int dcelogin_atmost_once;
  37 #endif /* WITH_DFS */
  38
  39 /* really we should have a top level context structure that has the
  40    client file descriptor as an element. That would require a major rewrite :(
  41
  42    the following 2 functions are an alternative - they make the file
  43    descriptor private to smbd
  44  */
  45 static int server_fd = -1;
  46
  47 int smbd_server_fd(void)
  48 {
  49         return server_fd;
  50 }
  51
  52 static void smbd_set_server_fd(int fd)
  53 {
  54         server_fd = fd;
  55 }
  56
  57 int get_client_fd(void)
  58 {
  59         return server_fd;
  60 }
  61
  62 int client_get_tcp_info(struct sockaddr_in *server, struct sockaddr_in *client)
  63 {
  64         socklen_t length;
  65         if (server_fd == -1) {
  66                 return -1;
  67         }
  68         length = sizeof(*server);
  69         if (getsockname(server_fd, (struct sockaddr *)server, &length) != 0) {
  70                 return -1;
  71         }
  72         length = sizeof(*client);
  73         if (getpeername(server_fd, (struct sockaddr *)client, &length) != 0) {
  74                 return -1;
  75         }
  76         return 0;
  77 }
  78
  79 struct event_context *smbd_event_context(void)
  80 {
  81         static struct event_context *ctx;
  82
  83         if (!ctx && !(ctx = event_context_init(NULL))) {
  84                 smb_panic("Could not init smbd event context");
  85         }
  86         return ctx;
  87 }
  88
  89 struct messaging_context *smbd_messaging_context(void)
  90 {
  91         static struct messaging_context *ctx;
  92
  93         if (!ctx && !(ctx = messaging_init(NULL, server_id_self(),
  94                                            smbd_event_context()))) {
  95                 smb_panic("Could not init smbd messaging context");
  96         }
  97         return ctx;
  98 }
  99
 100 struct memcache *smbd_memcache(void)
 101 {
 102         static struct memcache *cache;
 103
 104         if (!cache
 105             && !(cache = memcache_init(NULL,
 106                                        lp_max_stat_cache_size()*1024))) {
 107
 108                 smb_panic("Could not init smbd memcache");
 109         }
 110         return cache;
 111 }
 112
 113 /*******************************************************************
 114  What to do when smb.conf is updated.
 115  ********************************************************************/
 116
 117 static void smb_conf_updated(struct messaging_context *msg,
 118                              void *private_data,
 119                              uint32_t msg_type,
 120                              struct server_id server_id,
 121                              DATA_BLOB *data)
 122 {
 123         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
 124                   "updated. Reloading.\n"));
 125         reload_services(False);
 126 }
 127
 128
 129 /*******************************************************************
 130  Delete a statcache entry.
 131  ********************************************************************/
 132
 133 static void smb_stat_cache_delete(struct messaging_context *msg,
 134                                   void *private_data,
 135                                   uint32_t msg_tnype,
 136                                   struct server_id server_id,
 137                                   DATA_BLOB *data)
 138 {
 139         const char *name = (const char *)data->data;
 140         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 141         stat_cache_delete(name);
 142 }
 143
 144 /****************************************************************************
 145  Terminate signal.
 146 ****************************************************************************/
 147
 148 static void sig_term(void)
 149 {
 150         got_sig_term = 1;
 151         sys_select_signal(SIGTERM);
 152 }
 153
 154 /****************************************************************************
 155  Catch a sighup.
 156 ****************************************************************************/
 157
 158 static void sig_hup(int sig)
 159 {
 160         reload_after_sighup = 1;
 161         sys_select_signal(SIGHUP);
 162 }
 163
 164 /****************************************************************************
 165  Catch a sigcld
 166 ****************************************************************************/
 167 static void sig_cld(int sig)
 168 {
 169         got_sig_cld = 1;
 170         sys_select_signal(SIGCLD);
 171 }
 172
 173 /****************************************************************************
 174   Send a SIGTERM to our process group.
 175 *****************************************************************************/
 176
 177 static void  killkids(void)
 178 {
 179         if(am_parent) kill(0,SIGTERM);
 180 }
 181
 182 /****************************************************************************
 183  Process a sam sync message - not sure whether to do this here or
 184  somewhere else.
 185 ****************************************************************************/
 186
 187 static void msg_sam_sync(struct messaging_context *msg,
 188                          void *private_data,
 189                          uint32_t msg_type,
 190                          struct server_id server_id,
 191                          DATA_BLOB *data)
 192 {
 193         DEBUG(10, ("** sam sync message received, ignoring\n"));
 194 }
 195
 196
 197 /****************************************************************************
 198  Open the socket communication - inetd.
 199 ****************************************************************************/
 200
 201 static bool open_sockets_inetd(void)
 202 {
 203         /* Started from inetd. fd 0 is the socket. */
 204         /* We will abort gracefully when the client or remote system
 205            goes away */
 206         smbd_set_server_fd(dup(0));
 207
 208         /* close our standard file descriptors */
 209         close_low_fds(False); /* Don't close stderr */
 210
 211         set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 212         set_socket_options(smbd_server_fd(), lp_socket_options());
 213
 214         return True;
 215 }
 216
 217 static void msg_exit_server(struct messaging_context *msg,
 218                             void *private_data,
 219                             uint32_t msg_type,
 220                             struct server_id server_id,
 221                             DATA_BLOB *data)
 222 {
 223         DEBUG(3, ("got a SHUTDOWN message\n"));
 224         exit_server_cleanly(NULL);
 225 }
 226
 227 #ifdef DEVELOPER
 228 static void msg_inject_fault(struct messaging_context *msg,
 229                              void *private_data,
 230                              uint32_t msg_type,
 231                              struct server_id src,
 232                              DATA_BLOB *data)
 233 {
 234         int sig;
 235
 236         if (data->length != sizeof(sig)) {
 237
 238                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 239                           procid_str_static(&src)));
 240                 return;
 241         }
 242
 243         sig = *(int *)data->data;
 244         if (sig == -1) {
 245                 exit_server("internal error injected");
 246                 return;
 247         }
 248
 249 #if HAVE_STRSIGNAL
 250         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 251                   procid_str_static(&src), sig, strsignal(sig)));
 252 #else
 253         DEBUG(0, ("Process %s requested injection of signal %d\n",
 254                   procid_str_static(&src), sig));
 255 #endif
 256
 257         kill(sys_getpid(), sig);
 258 }
 259 #endif /* DEVELOPER */
 260
 261 struct child_pid {
 262         struct child_pid *prev, *next;
 263         pid_t pid;
 264 };
 265
 266 static struct child_pid *children;
 267 static int num_children;
 268
 269 static void add_child_pid(pid_t pid)
 270 {
 271         struct child_pid *child;
 272
 273         if (lp_max_smbd_processes() == 0) {
 274                 /* Don't bother with the child list if we don't care anyway */
 275                 return;
 276         }
 277
 278         child = SMB_MALLOC_P(struct child_pid);
 279         if (child == NULL) {
 280                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 281                 return;
 282         }
 283         child->pid = pid;
 284         DLIST_ADD(children, child);
 285         num_children += 1;
 286 }
 287
 288 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 289 {
 290         struct child_pid *child;
 291
 292         if (unclean_shutdown) {
 293                 /* a child terminated uncleanly so tickle all processes to see
 294                    if they can grab any of the pending locks
 295                 */
 296                 messaging_send_buf(smbd_messaging_context(), procid_self(),
 297                                    MSG_SMB_BRL_VALIDATE, NULL, 0);
 298                 message_send_all(smbd_messaging_context(),
 299                                  MSG_SMB_UNLOCK, NULL, 0, NULL);
 300         }
 301
 302         if (lp_max_smbd_processes() == 0) {
 303                 /* Don't bother with the child list if we don't care anyway */
 304                 return;
 305         }
 306
 307         for (child = children; child != NULL; child = child->next) {
 308                 if (child->pid == pid) {
 309                         struct child_pid *tmp = child;
 310                         DLIST_REMOVE(children, child);
 311                         SAFE_FREE(tmp);
 312                         num_children -= 1;
 313                         return;
 314                 }
 315         }
 316
 317         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 318 }
 319
 320 /****************************************************************************
 321  Have we reached the process limit ?
 322 ****************************************************************************/
 323
 324 static bool allowable_number_of_smbd_processes(void)
 325 {
 326         int max_processes = lp_max_smbd_processes();
 327
 328         if (!max_processes)
 329                 return True;
 330
 331         return num_children < max_processes;
 332 }
 333
 334 /****************************************************************************
 335  Open the socket communication.
 336 ****************************************************************************/
 337
 338 static bool open_sockets_smbd(bool is_daemon, bool interactive, const char *smb_ports)
 339 {
 340         int num_interfaces = iface_count();
 341         int num_sockets = 0;
 342         int fd_listenset[FD_SETSIZE];
 343         fd_set listen_set;
 344         int s;
 345         int maxfd = 0;
 346         int i;
 347         char *ports;
 348         struct dns_reg_state * dns_reg = NULL;
 349         unsigned dns_port = 0;
 350
 351         if (!is_daemon) {
 352                 return open_sockets_inetd();
 353         }
 354
 355 #ifdef HAVE_ATEXIT
 356         {
 357                 static int atexit_set;
 358                 if(atexit_set == 0) {
 359                         atexit_set=1;
 360                         atexit(killkids);
 361                 }
 362         }
 363 #endif
 364
 365         /* Stop zombies */
 366         CatchSignal(SIGCLD, sig_cld);
 367
 368         FD_ZERO(&listen_set);
 369
 370         /* use a reasonable default set of ports - listing on 445 and 139 */
 371         if (!smb_ports) {
 372                 ports = lp_smb_ports();
 373                 if (!ports || !*ports) {
 374                         ports = smb_xstrdup(SMB_PORTS);
 375                 } else {
 376                         ports = smb_xstrdup(ports);
 377                 }
 378         } else {
 379                 ports = smb_xstrdup(smb_ports);
 380         }
 381
 382         if (lp_interfaces() && lp_bind_interfaces_only()) {
 383                 /* We have been given an interfaces line, and been
 384                    told to only bind to those interfaces. Create a
 385                    socket per interface and bind to only these.
 386                 */
 387
 388                 /* Now open a listen socket for each of the
 389                    interfaces. */
 390                 for(i = 0; i < num_interfaces; i++) {
 391                         TALLOC_CTX *frame = NULL;
 392                         const struct sockaddr_storage *ifss =
 393                                         iface_n_sockaddr_storage(i);
 394                         char *tok;
 395                         const char *ptr;
 396
 397                         if (ifss == NULL) {
 398                                 DEBUG(0,("open_sockets_smbd: "
 399                                         "interface %d has NULL IP address !\n",
 400                                         i));
 401                                 continue;
 402                         }
 403
 404                         frame = talloc_stackframe();
 405                         for (ptr=ports;
 406                                         next_token_talloc(frame,&ptr, &tok, " \t,");) {
 407                                 unsigned port = atoi(tok);
 408                                 if (port == 0 || port > 0xffff) {
 409                                         continue;
 410                                 }
 411
 412                                 /* Keep the first port for mDNS service
 413                                  * registration.
 414                                  */
 415                                 if (dns_port == 0) {
 416                                         dns_port = port;
 417                                 }
 418
 419                                 s = fd_listenset[num_sockets] =
 420                                         open_socket_in(SOCK_STREAM,
 421                                                         port,
 422                                                         num_sockets == 0 ? 0 : 2,
 423                                                         ifss,
 424                                                         true);
 425                                 if(s == -1) {
 426                                         continue;
 427                                 }
 428
 429                                 /* ready to listen */
 430                                 set_socket_options(s,"SO_KEEPALIVE");
 431                                 set_socket_options(s,lp_socket_options());
 432
 433                                 /* Set server socket to
 434                                  * non-blocking for the accept. */
 435                                 set_blocking(s,False);
 436
 437                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 438                                         DEBUG(0,("open_sockets_smbd: listen: "
 439                                                 "%s\n", strerror(errno)));
 440                                         close(s);
 441                                         TALLOC_FREE(frame);
 442                                         return False;
 443                                 }
 444                                 FD_SET(s,&listen_set);
 445                                 maxfd = MAX( maxfd, s);
 446
 447                                 num_sockets++;
 448                                 if (num_sockets >= FD_SETSIZE) {
 449                                         DEBUG(0,("open_sockets_smbd: Too "
 450                                                 "many sockets to bind to\n"));
 451                                         TALLOC_FREE(frame);
 452                                         return False;
 453                                 }
 454                         }
 455                         TALLOC_FREE(frame);
 456                 }
 457         } else {
 458                 /* Just bind to 0.0.0.0 - accept connections
 459                    from anywhere. */
 460
 461                 TALLOC_CTX *frame = talloc_stackframe();
 462                 char *tok;
 463                 const char *ptr;
 464                 const char *sock_addr = lp_socket_address();
 465                 char *sock_tok;
 466                 const char *sock_ptr;
 467
 468                 if (strequal(sock_addr, "0.0.0.0") ||
 469                                 strequal(sock_addr, "::")) {
 470 #if HAVE_IPV6
 471                         sock_addr = "::,0.0.0.0";
 472 #else
 473                         sock_addr = "0.0.0.0";
 474 #endif
 475                 }
 476
 477                 for (sock_ptr=sock_addr;
 478                                 next_token_talloc(frame, &sock_ptr, &sock_tok, " \t,"); ) {
 479                         for (ptr=ports; next_token_talloc(frame, &ptr, &tok, " \t,"); ) {
 480                                 struct sockaddr_storage ss;
 481
 482                                 unsigned port = atoi(tok);
 483                                 if (port == 0 || port > 0xffff) {
 484                                         continue;
 485                                 }
 486
 487                                 /* Keep the first port for mDNS service
 488                                  * registration.
 489                                  */
 490                                 if (dns_port == 0) {
 491                                         dns_port = port;
 492                                 }
 493
 494                                 /* open an incoming socket */
 495                                 if (!interpret_string_addr(&ss, sock_tok,
 496                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 497                                         continue;
 498                                 }
 499
 500                                 s = open_socket_in(SOCK_STREAM,
 501                                                 port,
 502                                                 num_sockets == 0 ? 0 : 2,
 503                                                 &ss,
 504                                                 true);
 505                                 if (s == -1) {
 506                                         continue;
 507                                 }
 508
 509                                 /* ready to listen */
 510                                 set_socket_options(s,"SO_KEEPALIVE");
 511                                 set_socket_options(s,lp_socket_options());
 512
 513                                 /* Set server socket to non-blocking
 514                                  * for the accept. */
 515                                 set_blocking(s,False);
 516
 517                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 518                                         DEBUG(0,("open_sockets_smbd: "
 519                                                 "listen: %s\n",
 520                                                  strerror(errno)));
 521                                         close(s);
 522                                         TALLOC_FREE(frame);
 523                                         return False;
 524                                 }
 525
 526                                 fd_listenset[num_sockets] = s;
 527                                 FD_SET(s,&listen_set);
 528                                 maxfd = MAX( maxfd, s);
 529
 530                                 num_sockets++;
 531
 532                                 if (num_sockets >= FD_SETSIZE) {
 533                                         DEBUG(0,("open_sockets_smbd: Too "
 534                                                 "many sockets to bind to\n"));
 535                                         TALLOC_FREE(frame);
 536                                         return False;
 537                                 }
 538                         }
 539                 }
 540                 TALLOC_FREE(frame);
 541         }
 542
 543         SAFE_FREE(ports);
 544
 545         if (num_sockets == 0) {
 546                 DEBUG(0,("open_sockets_smbd: No "
 547                         "sockets available to bind to.\n"));
 548                 return false;
 549         }
 550
 551         /* Setup the main smbd so that we can get messages. Note that
 552            do this after starting listening. This is needed as when in
 553            clustered mode, ctdb won't allow us to start doing database
 554            operations until it has gone thru a full startup, which
 555            includes checking to see that smbd is listening. */
 556         claim_connection(NULL,"",
 557                          FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
 558
 559         /* Listen to messages */
 560
 561         messaging_register(smbd_messaging_context(), NULL,
 562                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 563         messaging_register(smbd_messaging_context(), NULL,
 564                            MSG_SHUTDOWN, msg_exit_server);
 565         messaging_register(smbd_messaging_context(), NULL,
 566                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 567         messaging_register(smbd_messaging_context(), NULL,
 568                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 569         messaging_register(smbd_messaging_context(), NULL,
 570                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 571         brl_register_msgs(smbd_messaging_context());
 572
 573 #ifdef DEVELOPER
 574         messaging_register(smbd_messaging_context(), NULL,
 575                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 576 #endif
 577
 578         db_tdb2_setup_messaging(smbd_messaging_context(), true);
 579
 580         /* now accept incoming connections - forking a new process
 581            for each incoming connection */
 582         DEBUG(2,("waiting for a connection\n"));
 583         while (1) {
 584                 struct timeval now, idle_timeout;
 585                 fd_set r_fds, w_fds;
 586                 int num;
 587
 588                 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
 589                 message_dispatch(smbd_messaging_context());
 590
 591                 if (got_sig_cld) {
 592                         pid_t pid;
 593                         int status;
 594
 595                         got_sig_cld = False;
 596
 597                         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 598                                 bool unclean_shutdown = False;
 599
 600                                 /* If the child terminated normally, assume
 601                                    it was an unclean shutdown unless the
 602                                    status is 0
 603                                 */
 604                                 if (WIFEXITED(status)) {
 605                                         unclean_shutdown = WEXITSTATUS(status);
 606                                 }
 607                                 /* If the child terminated due to a signal
 608                                    we always assume it was unclean.
 609                                 */
 610                                 if (WIFSIGNALED(status)) {
 611                                         unclean_shutdown = True;
 612                                 }
 613                                 remove_child_pid(pid, unclean_shutdown);
 614                         }
 615                 }
 616
 617                 idle_timeout = timeval_zero();
 618
 619                 memcpy((char *)&r_fds, (char *)&listen_set,
 620                        sizeof(listen_set));
 621                 FD_ZERO(&w_fds);
 622                 GetTimeOfDay(&now);
 623
 624                 /* Kick off our mDNS registration. */
 625                 if (dns_port != 0) {
 626                         dns_register_smbd(&dns_reg, dns_port, &maxfd,
 627                                         &r_fds, &idle_timeout);
 628                 }
 629
 630                 event_add_to_select_args(smbd_event_context(), &now,
 631                                          &r_fds, &w_fds, &idle_timeout,
 632                                          &maxfd);
 633
 634                 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
 635                                  timeval_is_zero(&idle_timeout) ?
 636                                  NULL : &idle_timeout);
 637
 638                 if (num == -1 && errno == EINTR) {
 639                         if (got_sig_term) {
 640                                 exit_server_cleanly(NULL);
 641                         }
 642
 643                         /* check for sighup processing */
 644                         if (reload_after_sighup) {
 645                                 change_to_root_user();
 646                                 DEBUG(1,("Reloading services after SIGHUP\n"));
 647                                 reload_services(False);
 648                                 reload_after_sighup = 0;
 649                         }
 650
 651                         continue;
 652                 }
 653
 654
 655                 /* If the idle timeout fired and we don't have any connected
 656                  * users, exit gracefully. We should be running under a process
 657                  * controller that will restart us if necessry.
 658                  */
 659                 if (num == 0 && count_all_current_connections() == 0) {
 660                         exit_server_cleanly("idle timeout");
 661                 }
 662
 663                 /* process pending nDNS responses */
 664                 if (dns_register_smbd_reply(dns_reg, &r_fds, &idle_timeout)) {
 665                         --num;
 666                 }
 667
 668                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 669                         continue;
 670                 }
 671
 672                 /* check if we need to reload services */
 673                 check_reload(time(NULL));
 674
 675                 /* Find the sockets that are read-ready -
 676                    accept on these. */
 677                 for( ; num > 0; num--) {
 678                         struct sockaddr addr;
 679                         socklen_t in_addrlen = sizeof(addr);
 680                         pid_t child = 0;
 681
 682                         s = -1;
 683                         for(i = 0; i < num_sockets; i++) {
 684                                 if(FD_ISSET(fd_listenset[i],&r_fds)) {
 685                                         s = fd_listenset[i];
 686                                         /* Clear this so we don't look
 687                                            at it again. */
 688                                         FD_CLR(fd_listenset[i],&r_fds);
 689                                         break;
 690                                 }
 691                         }
 692
 693                         smbd_set_server_fd(accept(s,&addr,&in_addrlen));
 694
 695                         if (smbd_server_fd() == -1 && errno == EINTR)
 696                                 continue;
 697
 698                         if (smbd_server_fd() == -1) {
 699                                 DEBUG(2,("open_sockets_smbd: accept: %s\n",
 700                                          strerror(errno)));
 701                                 continue;
 702                         }
 703
 704                         /* Ensure child is set to blocking mode */
 705                         set_blocking(smbd_server_fd(),True);
 706
 707                         if (smbd_server_fd() != -1 && interactive)
 708                                 return True;
 709
 710                         if (allowable_number_of_smbd_processes() &&
 711                             smbd_server_fd() != -1 &&
 712                             ((child = sys_fork())==0)) {
 713                                 char remaddr[INET6_ADDRSTRLEN];
 714
 715                                 /* Child code ... */
 716
 717                                 /* Stop zombies, the parent explicitly handles
 718                                  * them, counting worker smbds. */
 719                                 CatchChild();
 720
 721                                 /* close the listening socket(s) */
 722                                 for(i = 0; i < num_sockets; i++)
 723                                         close(fd_listenset[i]);
 724
 725                                 /* close our mDNS daemon handle */
 726                                 dns_register_close(&dns_reg);
 727
 728                                 /* close our standard file
 729                                    descriptors */
 730                                 close_low_fds(False);
 731                                 am_parent = 0;
 732
 733                                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 734                                 set_socket_options(smbd_server_fd(),
 735                                                    lp_socket_options());
 736
 737                                 /* this is needed so that we get decent entries
 738                                    in smbstatus for port 445 connects */
 739                                 set_remote_machine_name(get_peer_addr(smbd_server_fd(),
 740                                                                 remaddr,
 741                                                                 sizeof(remaddr)),
 742                                                                 false);
 743
 744                                 /* Reset the state of the random
 745                                  * number generation system, so
 746                                  * children do not get the same random
 747                                  * numbers as each other */
 748
 749                                 set_need_random_reseed();
 750                                 /* tdb needs special fork handling - remove
 751                                  * CLEAR_IF_FIRST flags */
 752                                 if (tdb_reopen_all(1) == -1) {
 753                                         DEBUG(0,("tdb_reopen_all failed.\n"));
 754                                         smb_panic("tdb_reopen_all failed");
 755                                 }
 756
 757                                 return True;
 758                         }
 759                         /* The parent doesn't need this socket */
 760                         close(smbd_server_fd());
 761
 762                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 763                                 Clear the closed fd info out of server_fd --
 764                                 and more importantly, out of client_fd in
 765                                 util_sock.c, to avoid a possible
 766                                 getpeername failure if we reopen the logs
 767                                 and use %I in the filename.
 768                         */
 769
 770                         smbd_set_server_fd(-1);
 771
 772                         if (child != 0) {
 773                                 add_child_pid(child);
 774                         }
 775
 776                         /* Force parent to check log size after
 777                          * spawning child.  Fix from
 778                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 779                          * parent smbd will log to logserver.smb.  It
 780                          * writes only two messages for each child
 781                          * started/finished. But each child writes,
 782                          * say, 50 messages also in logserver.smb,
 783                          * begining with the debug_count of the
 784                          * parent, before the child opens its own log
 785                          * file logserver.client. In a worst case
 786                          * scenario the size of logserver.smb would be
 787                          * checked after about 50*50=2500 messages
 788                          * (ca. 100kb).
 789                          * */
 790                         force_check_log_size();
 791
 792                 } /* end for num */
 793         } /* end while 1 */
 794
 795 /* NOTREACHED   return True; */
 796 }
 797
 798 /****************************************************************************
 799  Reload printers
 800 **************************************************************************/
 801 void reload_printers(void)
 802 {
 803         int snum;
 804         int n_services = lp_numservices();
 805         int pnum = lp_servicenumber(PRINTERS_NAME);
 806         const char *pname;
 807
 808         pcap_cache_reload();
 809
 810         /* remove stale printers */
 811         for (snum = 0; snum < n_services; snum++) {
 812                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 813                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 814                                       lp_autoloaded(snum)))
 815                         continue;
 816
 817                 pname = lp_printername(snum);
 818                 if (!pcap_printername_ok(pname)) {
 819                         DEBUG(3, ("removing stale printer %s\n", pname));
 820
 821                         if (is_printer_published(NULL, snum, NULL))
 822                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 823                         del_a_printer(pname);
 824                         lp_killservice(snum);
 825                 }
 826         }
 827
 828         load_printers();
 829 }
 830
 831 /****************************************************************************
 832  Reload the services file.
 833 **************************************************************************/
 834
 835 bool reload_services(bool test)
 836 {
 837         bool ret;
 838
 839         if (lp_loaded()) {
 840                 char *fname = lp_configfile();
 841                 if (file_exist(fname, NULL) &&
 842                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 843                         set_dyn_CONFIGFILE(fname);
 844                         test = False;
 845                 }
 846         }
 847
 848         reopen_logs();
 849
 850         if (test && !lp_file_list_changed())
 851                 return(True);
 852
 853         lp_killunused(conn_snum_used);
 854
 855         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 856
 857         reload_printers();
 858
 859         /* perhaps the config filename is now set */
 860         if (!test)
 861                 reload_services(True);
 862
 863         reopen_logs();
 864
 865         load_interfaces();
 866
 867         if (smbd_server_fd() != -1) {
 868                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 869                 set_socket_options(smbd_server_fd(), lp_socket_options());
 870         }
 871
 872         mangle_reset_cache();
 873         reset_stat_cache();
 874
 875         /* this forces service parameters to be flushed */
 876         set_current_service(NULL,0,True);
 877
 878         return(ret);
 879 }
 880
 881 /****************************************************************************
 882  Exit the server.
 883 ****************************************************************************/
 884
 885 /* Reasons for shutting down a server process. */
 886 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 887
 888 static void exit_server_common(enum server_exit_reason how,
 889         const char *const reason) NORETURN_ATTRIBUTE;
 890
 891 static void exit_server_common(enum server_exit_reason how,
 892         const char *const reason)
 893 {
 894         static int firsttime=1;
 895
 896         if (!firsttime)
 897                 exit(0);
 898         firsttime = 0;
 899
 900         change_to_root_user();
 901
 902         if (negprot_global_auth_context) {
 903                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 904         }
 905
 906         conn_close_all();
 907
 908         invalidate_all_vuids();
 909
 910         /* 3 second timeout. */
 911         print_notify_send_messages(smbd_messaging_context(), 3);
 912
 913         /* delete our entry in the connections database. */
 914         yield_connection(NULL,"");
 915
 916         respond_to_all_remaining_local_messages();
 917
 918 #ifdef WITH_DFS
 919         if (dcelogin_atmost_once) {
 920                 dfs_unlogin();
 921         }
 922 #endif
 923
 924 #ifdef USE_DMAPI
 925         /* Destroy Samba DMAPI session only if we are master smbd process */
 926         if (am_parent) {
 927                 if (!dmapi_destroy_session()) {
 928                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 929                 }
 930         }
 931 #endif
 932
 933         locking_end();
 934         printing_end();
 935
 936         if (how != SERVER_EXIT_NORMAL) {
 937                 int oldlevel = DEBUGLEVEL;
 938
 939                 DEBUGLEVEL = 10;
 940
 941                 DEBUGSEP(0);
 942                 DEBUG(0,("Abnormal server exit: %s\n",
 943                         reason ? reason : "no explanation provided"));
 944                 DEBUGSEP(0);
 945
 946                 log_stack_trace();
 947
 948                 DEBUGLEVEL = oldlevel;
 949                 dump_core();
 950
 951         } else {
 952                 DEBUG(3,("Server exit (%s)\n",
 953                         (reason ? reason : "normal exit")));
 954         }
 955
 956         exit(0);
 957 }
 958
 959 void exit_server(const char *const explanation)
 960 {
 961         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 962 }
 963
 964 void exit_server_cleanly(const char *const explanation)
 965 {
 966         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 967 }
 968
 969 void exit_server_fault(void)
 970 {
 971         exit_server("critical server fault");
 972 }
 973
 974
 975 /****************************************************************************
 976 received when we should release a specific IP
 977 ****************************************************************************/
 978 static void release_ip(const char *ip, void *priv)
 979 {
 980         char addr[INET6_ADDRSTRLEN];
 981
 982         if (strcmp(client_socket_addr(get_client_fd(),addr,sizeof(addr)), ip) == 0) {
 983                 /* we can't afford to do a clean exit - that involves
 984                    database writes, which would potentially mean we
 985                    are still running after the failover has finished -
 986                    we have to get rid of this process ID straight
 987                    away */
 988                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
 989                         ip));
 990                 _exit(0);
 991         }
 992 }
 993
 994 static void msg_release_ip(struct messaging_context *msg_ctx, void *private_data,
 995                            uint32_t msg_type, struct server_id server_id, DATA_BLOB *data)
 996 {
 997         release_ip((char *)data->data, NULL);
 998 }
 999
1000 /****************************************************************************
1001  Initialise connect, service and file structs.
1002 ****************************************************************************/
1003
1004 static bool init_structs(void )
1005 {
1006         /*
1007          * Set the machine NETBIOS name if not already
1008          * set from the config file.
1009          */
1010
1011         if (!init_names())
1012                 return False;
1013
1014         conn_init();
1015
1016         file_init();
1017
1018         /* for RPC pipes */
1019         init_rpc_pipe_hnd();
1020
1021         init_dptrs();
1022
1023         if (!secrets_init())
1024                 return False;
1025
1026         return True;
1027 }
1028
1029 /*
1030  * Send keepalive packets to our client
1031  */
1032 static bool keepalive_fn(const struct timeval *now, void *private_data)
1033 {
1034         if (!send_keepalive(smbd_server_fd())) {
1035                 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1036                 return False;
1037         }
1038         return True;
1039 }
1040
1041 /*
1042  * Do the recurring check if we're idle
1043  */
1044 static bool deadtime_fn(const struct timeval *now, void *private_data)
1045 {
1046         if ((conn_num_open() == 0)
1047             || (conn_idle_all(now->tv_sec))) {
1048                 DEBUG( 2, ( "Closing idle connection\n" ) );
1049                 messaging_send(smbd_messaging_context(), procid_self(),
1050                                MSG_SHUTDOWN, &data_blob_null);
1051                 return False;
1052         }
1053
1054         return True;
1055 }
1056
1057
1058 /****************************************************************************
1059  main program.
1060 ****************************************************************************/
1061
1062 /* Declare prototype for build_options() to avoid having to run it through
1063    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
1064    prototype generation system is too complicated. */
1065
1066 extern void build_options(bool screen);
1067
1068  int main(int argc,const char *argv[])
1069 {
1070         /* shall I run as a daemon */
1071         static bool is_daemon = False;
1072         static bool interactive = False;
1073         static bool Fork = True;
1074         static bool no_process_group = False;
1075         static bool log_stdout = False;
1076         static char *ports = NULL;
1077         static char *profile_level = NULL;
1078         int opt;
1079         poptContext pc;
1080         bool print_build_options = False;
1081         enum {
1082                 OPT_DAEMON = 1000,
1083                 OPT_INTERACTIVE,
1084                 OPT_FORK,
1085                 OPT_NO_PROCESS_GROUP,
1086                 OPT_LOG_STDOUT
1087         };
1088         struct poptOption long_options[] = {
1089         POPT_AUTOHELP
1090         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1091         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1092         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1093         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1094         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1095         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1096         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1097         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1098         POPT_COMMON_SAMBA
1099         POPT_COMMON_DYNCONFIG
1100         POPT_TABLEEND
1101         };
1102         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1103
1104         TimeInit();
1105
1106 #ifdef HAVE_SET_AUTH_PARAMETERS
1107         set_auth_parameters(argc,argv);
1108 #endif
1109
1110         pc = poptGetContext("smbd", argc, argv, long_options, 0);
1111         while((opt = poptGetNextOpt(pc)) != -1) {
1112                 switch (opt)  {
1113                 case OPT_DAEMON:
1114                         is_daemon = true;
1115                         break;
1116                 case OPT_INTERACTIVE:
1117                         interactive = true;
1118                         break;
1119                 case OPT_FORK:
1120                         Fork = false;
1121                         break;
1122                 case OPT_NO_PROCESS_GROUP:
1123                         no_process_group = true;
1124                         break;
1125                 case OPT_LOG_STDOUT:
1126                         log_stdout = true;
1127                         break;
1128                 case 'b':
1129                         print_build_options = True;
1130                         break;
1131                 default:
1132                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1133                                   poptBadOption(pc, 0), poptStrerror(opt));
1134                         poptPrintUsage(pc, stderr, 0);
1135                         exit(1);
1136                 }
1137         }
1138         poptFreeContext(pc);
1139
1140         if (interactive) {
1141                 Fork = False;
1142                 log_stdout = True;
1143         }
1144
1145         setup_logging(argv[0],log_stdout);
1146
1147         if (print_build_options) {
1148                 build_options(True); /* Display output to screen as well as debug */
1149                 exit(0);
1150         }
1151
1152         load_case_tables();
1153
1154 #ifdef HAVE_SETLUID
1155         /* needed for SecureWare on SCO */
1156         setluid(0);
1157 #endif
1158
1159         sec_init();
1160
1161         set_remote_machine_name("smbd", False);
1162
1163         if (interactive && (DEBUGLEVEL >= 9)) {
1164                 talloc_enable_leak_report();
1165         }
1166
1167         if (log_stdout && Fork) {
1168                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1169                 exit(1);
1170         }
1171
1172         /* we want to re-seed early to prevent time delays causing
1173            client problems at a later date. (tridge) */
1174         generate_random_buffer(NULL, 0);
1175
1176         /* make absolutely sure we run as root - to handle cases where people
1177            are crazy enough to have it setuid */
1178
1179         gain_root_privilege();
1180         gain_root_group_privilege();
1181
1182         fault_setup((void (*)(void *))exit_server_fault);
1183         dump_core_setup("smbd");
1184
1185         CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
1186         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
1187
1188         /* we are never interested in SIGPIPE */
1189         BlockSignals(True,SIGPIPE);
1190
1191 #if defined(SIGFPE)
1192         /* we are never interested in SIGFPE */
1193         BlockSignals(True,SIGFPE);
1194 #endif
1195
1196 #if defined(SIGUSR2)
1197         /* We are no longer interested in USR2 */
1198         BlockSignals(True,SIGUSR2);
1199 #endif
1200
1201         /* POSIX demands that signals are inherited. If the invoking process has
1202          * these signals masked, we will have problems, as we won't recieve them. */
1203         BlockSignals(False, SIGHUP);
1204         BlockSignals(False, SIGUSR1);
1205         BlockSignals(False, SIGTERM);
1206
1207         /* we want total control over the permissions on created files,
1208            so set our umask to 0 */
1209         umask(0);
1210
1211         init_sec_ctx();
1212
1213         reopen_logs();
1214
1215         DEBUG(0,("smbd version %s started.\n", SAMBA_VERSION_STRING));
1216         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1217
1218         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1219                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1220
1221         /* Output the build options to the debug log */
1222         build_options(False);
1223
1224         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1225                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1226                 exit(1);
1227         }
1228
1229         /*
1230          * Do this before reload_services.
1231          */
1232         db_tdb2_setup_messaging(NULL, false);
1233
1234         if (!reload_services(False))
1235                 return(-1);
1236
1237         init_structs();
1238
1239 #ifdef WITH_PROFILE
1240         if (!profile_setup(smbd_messaging_context(), False)) {
1241                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1242                 return -1;
1243         }
1244         if (profile_level != NULL) {
1245                 int pl = atoi(profile_level);
1246                 struct server_id src;
1247
1248                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1249                 src.pid = getpid();
1250                 set_profile_level(pl, src);
1251         }
1252 #endif
1253
1254         DEBUG(3,( "loaded services\n"));
1255
1256         if (!is_daemon && !is_a_socket(0)) {
1257                 if (!interactive)
1258                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1259
1260                 /*
1261                  * Setting is_daemon here prevents us from eventually calling
1262                  * the open_sockets_inetd()
1263                  */
1264
1265                 is_daemon = True;
1266         }
1267
1268         if (is_daemon && !interactive) {
1269                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1270                 become_daemon(Fork, no_process_group);
1271         }
1272
1273 #if HAVE_SETPGID
1274         /*
1275          * If we're interactive we want to set our own process group for
1276          * signal management.
1277          */
1278         if (interactive && !no_process_group)
1279                 setpgid( (pid_t)0, (pid_t)0);
1280 #endif
1281
1282         if (!directory_exist(lp_lockdir(), NULL))
1283                 mkdir(lp_lockdir(), 0755);
1284
1285         if (is_daemon)
1286                 pidfile_create("smbd");
1287
1288         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1289
1290         if (smbd_messaging_context() == NULL)
1291                 exit(1);
1292
1293         if (smbd_memcache() == NULL) {
1294                 exit(1);
1295         }
1296
1297         memcache_set_global(smbd_memcache());
1298
1299         /* Initialise the password backed before the global_sam_sid
1300            to ensure that we fetch from ldap before we make a domain sid up */
1301
1302         if(!initialize_password_db(False, smbd_event_context()))
1303                 exit(1);
1304
1305         if (!secrets_init()) {
1306                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1307                 exit(1);
1308         }
1309
1310         if(!get_global_sam_sid()) {
1311                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1312                 exit(1);
1313         }
1314
1315         if (!session_init())
1316                 exit(1);
1317
1318         if (!connections_init(True))
1319                 exit(1);
1320
1321         if (!locking_init())
1322                 exit(1);
1323
1324         namecache_enable();
1325
1326         if (!W_ERROR_IS_OK(registry_init_full()))
1327                 exit(1);
1328
1329 #if 0
1330         if (!init_svcctl_db())
1331                 exit(1);
1332 #endif
1333
1334         if (!print_backend_init(smbd_messaging_context()))
1335                 exit(1);
1336
1337         if (!init_guest_info()) {
1338                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1339                 return -1;
1340         }
1341
1342         /* only start the background queue daemon if we are
1343            running as a daemon -- bad things will happen if
1344            smbd is launched via inetd and we fork a copy of
1345            ourselves here */
1346
1347         if ( is_daemon && !interactive )
1348                 start_background_queue();
1349
1350         if (!open_sockets_smbd(is_daemon, interactive, ports))
1351                 exit(1);
1352
1353         /*
1354          * everything after this point is run after the fork()
1355          */
1356
1357         static_init_rpc;
1358
1359         init_modules();
1360
1361         /* Possibly reload the services file. Only worth doing in
1362          * daemon mode. In inetd mode, we know we only just loaded this.
1363          */
1364         if (is_daemon) {
1365                 reload_services(True);
1366         }
1367
1368         if (!init_account_policy()) {
1369                 DEBUG(0,("Could not open account policy tdb.\n"));
1370                 exit(1);
1371         }
1372
1373         if (*lp_rootdir()) {
1374                 if (sys_chroot(lp_rootdir()) == 0)
1375                         DEBUG(2,("Changed root to %s\n", lp_rootdir()));
1376         }
1377
1378         /* Setup oplocks */
1379         if (!init_oplocks(smbd_messaging_context()))
1380                 exit(1);
1381
1382         /* Setup aio signal handler. */
1383         initialize_async_io_handler();
1384
1385         /*
1386          * For clustering, we need to re-init our ctdbd connection after the
1387          * fork
1388          */
1389         if (!NT_STATUS_IS_OK(messaging_reinit(smbd_messaging_context())))
1390                 exit(1);
1391
1392         /* register our message handlers */
1393         messaging_register(smbd_messaging_context(), NULL,
1394                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
1395         messaging_register(smbd_messaging_context(), NULL,
1396                            MSG_SMB_RELEASE_IP, msg_release_ip);
1397
1398         if ((lp_keepalive() != 0)
1399             && !(event_add_idle(smbd_event_context(), NULL,
1400                                 timeval_set(lp_keepalive(), 0),
1401                                 "keepalive", keepalive_fn,
1402                                 NULL))) {
1403                 DEBUG(0, ("Could not add keepalive event\n"));
1404                 exit(1);
1405         }
1406
1407         if (!(event_add_idle(smbd_event_context(), NULL,
1408                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
1409                              "deadtime", deadtime_fn, NULL))) {
1410                 DEBUG(0, ("Could not add deadtime event\n"));
1411                 exit(1);
1412         }
1413
1414 #ifdef CLUSTER_SUPPORT
1415
1416         if (lp_clustering()) {
1417                 /*
1418                  * We need to tell ctdb about our client's TCP
1419                  * connection, so that for failover ctdbd can send
1420                  * tickle acks, triggering a reconnection by the
1421                  * client.
1422                  */
1423
1424                 struct sockaddr_in srv, clnt;
1425
1426                 if (client_get_tcp_info(&srv, &clnt) == 0) {
1427
1428                         NTSTATUS status;
1429
1430                         status = ctdbd_register_ips(
1431                                 messaging_ctdbd_connection(),
1432                                 &srv, &clnt, release_ip, NULL);
1433
1434                         if (!NT_STATUS_IS_OK(status)) {
1435                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
1436                                           nt_errstr(status)));
1437                         }
1438                 } else
1439                 {
1440                         DEBUG(0,("Unable to get tcp info for "
1441                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
1442                                  strerror(errno)));
1443                 }
1444         }
1445
1446 #endif
1447
1448         TALLOC_FREE(frame);
1449
1450         smbd_process();
1451
1452         namecache_shutdown();
1453
1454         exit_server_cleanly(NULL);
1455         return(0);
1456 }