source/smbd/server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Main SMB server routines
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) Martin Pool                    2002
   6    Copyright (C) Jelmer Vernooij                2002-2003
   7    Copyright (C) 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         /* now accept incoming connections - forking a new process
 579            for each incoming connection */
 580         DEBUG(2,("waiting for a connection\n"));
 581         while (1) {
 582                 struct timeval now, idle_timeout;
 583                 fd_set r_fds, w_fds;
 584                 int num;
 585
 586                 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
 587                 message_dispatch(smbd_messaging_context());
 588
 589                 if (got_sig_cld) {
 590                         pid_t pid;
 591                         int status;
 592
 593                         got_sig_cld = False;
 594
 595                         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 596                                 bool unclean_shutdown = False;
 597
 598                                 /* If the child terminated normally, assume
 599                                    it was an unclean shutdown unless the
 600                                    status is 0
 601                                 */
 602                                 if (WIFEXITED(status)) {
 603                                         unclean_shutdown = WEXITSTATUS(status);
 604                                 }
 605                                 /* If the child terminated due to a signal
 606                                    we always assume it was unclean.
 607                                 */
 608                                 if (WIFSIGNALED(status)) {
 609                                         unclean_shutdown = True;
 610                                 }
 611                                 remove_child_pid(pid, unclean_shutdown);
 612                         }
 613                 }
 614
 615                 idle_timeout = timeval_zero();
 616
 617                 memcpy((char *)&r_fds, (char *)&listen_set,
 618                        sizeof(listen_set));
 619                 FD_ZERO(&w_fds);
 620                 GetTimeOfDay(&now);
 621
 622                 /* Kick off our mDNS registration. */
 623                 if (dns_port != 0) {
 624                         dns_register_smbd(&dns_reg, dns_port, &maxfd,
 625                                         &r_fds, &idle_timeout);
 626                 }
 627
 628                 event_add_to_select_args(smbd_event_context(), &now,
 629                                          &r_fds, &w_fds, &idle_timeout,
 630                                          &maxfd);
 631
 632                 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
 633                                  timeval_is_zero(&idle_timeout) ?
 634                                  NULL : &idle_timeout);
 635
 636                 if (num == -1 && errno == EINTR) {
 637                         if (got_sig_term) {
 638                                 exit_server_cleanly(NULL);
 639                         }
 640
 641                         /* check for sighup processing */
 642                         if (reload_after_sighup) {
 643                                 change_to_root_user();
 644                                 DEBUG(1,("Reloading services after SIGHUP\n"));
 645                                 reload_services(False);
 646                                 reload_after_sighup = 0;
 647                         }
 648
 649                         continue;
 650                 }
 651
 652
 653                 /* If the idle timeout fired and we don't have any connected
 654                  * users, exit gracefully. We should be running under a process
 655                  * controller that will restart us if necessry.
 656                  */
 657                 if (num == 0 && count_all_current_connections() == 0) {
 658                         exit_server_cleanly("idle timeout");
 659                 }
 660
 661                 /* process pending nDNS responses */
 662                 if (dns_register_smbd_reply(dns_reg, &r_fds, &idle_timeout)) {
 663                         --num;
 664                 }
 665
 666                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 667                         continue;
 668                 }
 669
 670                 /* check if we need to reload services */
 671                 check_reload(time(NULL));
 672
 673                 /* Find the sockets that are read-ready -
 674                    accept on these. */
 675                 for( ; num > 0; num--) {
 676                         struct sockaddr addr;
 677                         socklen_t in_addrlen = sizeof(addr);
 678                         pid_t child = 0;
 679
 680                         s = -1;
 681                         for(i = 0; i < num_sockets; i++) {
 682                                 if(FD_ISSET(fd_listenset[i],&r_fds)) {
 683                                         s = fd_listenset[i];
 684                                         /* Clear this so we don't look
 685                                            at it again. */
 686                                         FD_CLR(fd_listenset[i],&r_fds);
 687                                         break;
 688                                 }
 689                         }
 690
 691                         smbd_set_server_fd(accept(s,&addr,&in_addrlen));
 692
 693                         if (smbd_server_fd() == -1 && errno == EINTR)
 694                                 continue;
 695
 696                         if (smbd_server_fd() == -1) {
 697                                 DEBUG(2,("open_sockets_smbd: accept: %s\n",
 698                                          strerror(errno)));
 699                                 continue;
 700                         }
 701
 702                         /* Ensure child is set to blocking mode */
 703                         set_blocking(smbd_server_fd(),True);
 704
 705                         if (smbd_server_fd() != -1 && interactive)
 706                                 return True;
 707
 708                         if (allowable_number_of_smbd_processes() &&
 709                             smbd_server_fd() != -1 &&
 710                             ((child = sys_fork())==0)) {
 711                                 char remaddr[INET6_ADDRSTRLEN];
 712
 713                                 /* Child code ... */
 714
 715                                 /* Stop zombies, the parent explicitly handles
 716                                  * them, counting worker smbds. */
 717                                 CatchChild();
 718
 719                                 /* close the listening socket(s) */
 720                                 for(i = 0; i < num_sockets; i++)
 721                                         close(fd_listenset[i]);
 722
 723                                 /* close our mDNS daemon handle */
 724                                 dns_register_close(&dns_reg);
 725
 726                                 /* close our standard file
 727                                    descriptors */
 728                                 close_low_fds(False);
 729                                 am_parent = 0;
 730
 731                                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 732                                 set_socket_options(smbd_server_fd(),
 733                                                    lp_socket_options());
 734
 735                                 /* this is needed so that we get decent entries
 736                                    in smbstatus for port 445 connects */
 737                                 set_remote_machine_name(get_peer_addr(smbd_server_fd(),
 738                                                                 remaddr,
 739                                                                 sizeof(remaddr)),
 740                                                                 false);
 741
 742                                 if (!reinit_after_fork(
 743                                             smbd_messaging_context(),
 744                                             smbd_event_context(),
 745                                             true)) {
 746                                         DEBUG(0,("reinit_after_fork() failed\n"));
 747                                         smb_panic("reinit_after_fork() failed");
 748                                 }
 749
 750                                 return True;
 751                         }
 752                         /* The parent doesn't need this socket */
 753                         close(smbd_server_fd());
 754
 755                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 756                                 Clear the closed fd info out of server_fd --
 757                                 and more importantly, out of client_fd in
 758                                 util_sock.c, to avoid a possible
 759                                 getpeername failure if we reopen the logs
 760                                 and use %I in the filename.
 761                         */
 762
 763                         smbd_set_server_fd(-1);
 764
 765                         if (child != 0) {
 766                                 add_child_pid(child);
 767                         }
 768
 769                         /* Force parent to check log size after
 770                          * spawning child.  Fix from
 771                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 772                          * parent smbd will log to logserver.smb.  It
 773                          * writes only two messages for each child
 774                          * started/finished. But each child writes,
 775                          * say, 50 messages also in logserver.smb,
 776                          * begining with the debug_count of the
 777                          * parent, before the child opens its own log
 778                          * file logserver.client. In a worst case
 779                          * scenario the size of logserver.smb would be
 780                          * checked after about 50*50=2500 messages
 781                          * (ca. 100kb).
 782                          * */
 783                         force_check_log_size();
 784
 785                 } /* end for num */
 786         } /* end while 1 */
 787
 788 /* NOTREACHED   return True; */
 789 }
 790
 791 /****************************************************************************
 792  Reload printers
 793 **************************************************************************/
 794 void reload_printers(void)
 795 {
 796         int snum;
 797         int n_services = lp_numservices();
 798         int pnum = lp_servicenumber(PRINTERS_NAME);
 799         const char *pname;
 800
 801         pcap_cache_reload();
 802
 803         /* remove stale printers */
 804         for (snum = 0; snum < n_services; snum++) {
 805                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 806                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 807                                       lp_autoloaded(snum)))
 808                         continue;
 809
 810                 pname = lp_printername(snum);
 811                 if (!pcap_printername_ok(pname)) {
 812                         DEBUG(3, ("removing stale printer %s\n", pname));
 813
 814                         if (is_printer_published(NULL, snum, NULL))
 815                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 816                         del_a_printer(pname);
 817                         lp_killservice(snum);
 818                 }
 819         }
 820
 821         load_printers();
 822 }
 823
 824 /****************************************************************************
 825  Reload the services file.
 826 **************************************************************************/
 827
 828 bool reload_services(bool test)
 829 {
 830         bool ret;
 831
 832         if (lp_loaded()) {
 833                 char *fname = lp_configfile();
 834                 if (file_exist(fname, NULL) &&
 835                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 836                         set_dyn_CONFIGFILE(fname);
 837                         test = False;
 838                 }
 839         }
 840
 841         reopen_logs();
 842
 843         if (test && !lp_file_list_changed())
 844                 return(True);
 845
 846         lp_killunused(conn_snum_used);
 847
 848         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 849
 850         reload_printers();
 851
 852         /* perhaps the config filename is now set */
 853         if (!test)
 854                 reload_services(True);
 855
 856         reopen_logs();
 857
 858         load_interfaces();
 859
 860         if (smbd_server_fd() != -1) {
 861                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 862                 set_socket_options(smbd_server_fd(), lp_socket_options());
 863         }
 864
 865         mangle_reset_cache();
 866         reset_stat_cache();
 867
 868         /* this forces service parameters to be flushed */
 869         set_current_service(NULL,0,True);
 870
 871         return(ret);
 872 }
 873
 874 /****************************************************************************
 875  Exit the server.
 876 ****************************************************************************/
 877
 878 /* Reasons for shutting down a server process. */
 879 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 880
 881 static void exit_server_common(enum server_exit_reason how,
 882         const char *const reason) NORETURN_ATTRIBUTE;
 883
 884 static void exit_server_common(enum server_exit_reason how,
 885         const char *const reason)
 886 {
 887         static int firsttime=1;
 888
 889         if (!firsttime)
 890                 exit(0);
 891         firsttime = 0;
 892
 893         change_to_root_user();
 894
 895         if (negprot_global_auth_context) {
 896                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 897         }
 898
 899         conn_close_all();
 900
 901         invalidate_all_vuids();
 902
 903         /* 3 second timeout. */
 904         print_notify_send_messages(smbd_messaging_context(), 3);
 905
 906         /* delete our entry in the connections database. */
 907         yield_connection(NULL,"");
 908
 909         respond_to_all_remaining_local_messages();
 910
 911 #ifdef WITH_DFS
 912         if (dcelogin_atmost_once) {
 913                 dfs_unlogin();
 914         }
 915 #endif
 916
 917 #ifdef USE_DMAPI
 918         /* Destroy Samba DMAPI session only if we are master smbd process */
 919         if (am_parent) {
 920                 if (!dmapi_destroy_session()) {
 921                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 922                 }
 923         }
 924 #endif
 925
 926         locking_end();
 927         printing_end();
 928
 929         if (how != SERVER_EXIT_NORMAL) {
 930                 int oldlevel = DEBUGLEVEL;
 931
 932                 DEBUGLEVEL = 10;
 933
 934                 DEBUGSEP(0);
 935                 DEBUG(0,("Abnormal server exit: %s\n",
 936                         reason ? reason : "no explanation provided"));
 937                 DEBUGSEP(0);
 938
 939                 log_stack_trace();
 940
 941                 DEBUGLEVEL = oldlevel;
 942                 dump_core();
 943
 944         } else {
 945                 DEBUG(3,("Server exit (%s)\n",
 946                         (reason ? reason : "normal exit")));
 947         }
 948
 949         exit(0);
 950 }
 951
 952 void exit_server(const char *const explanation)
 953 {
 954         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 955 }
 956
 957 void exit_server_cleanly(const char *const explanation)
 958 {
 959         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 960 }
 961
 962 void exit_server_fault(void)
 963 {
 964         exit_server("critical server fault");
 965 }
 966
 967
 968 /****************************************************************************
 969 received when we should release a specific IP
 970 ****************************************************************************/
 971 static void release_ip(const char *ip, void *priv)
 972 {
 973         char addr[INET6_ADDRSTRLEN];
 974
 975         if (strcmp(client_socket_addr(get_client_fd(),addr,sizeof(addr)), ip) == 0) {
 976                 /* we can't afford to do a clean exit - that involves
 977                    database writes, which would potentially mean we
 978                    are still running after the failover has finished -
 979                    we have to get rid of this process ID straight
 980                    away */
 981                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
 982                         ip));
 983                 _exit(0);
 984         }
 985 }
 986
 987 static void msg_release_ip(struct messaging_context *msg_ctx, void *private_data,
 988                            uint32_t msg_type, struct server_id server_id, DATA_BLOB *data)
 989 {
 990         release_ip((char *)data->data, NULL);
 991 }
 992
 993 /****************************************************************************
 994  Initialise connect, service and file structs.
 995 ****************************************************************************/
 996
 997 static bool init_structs(void )
 998 {
 999         /*
1000          * Set the machine NETBIOS name if not already
1001          * set from the config file.
1002          */
1003
1004         if (!init_names())
1005                 return False;
1006
1007         conn_init();
1008
1009         file_init();
1010
1011         /* for RPC pipes */
1012         init_rpc_pipe_hnd();
1013
1014         init_dptrs();
1015
1016         if (!secrets_init())
1017                 return False;
1018
1019         return True;
1020 }
1021
1022 /*
1023  * Send keepalive packets to our client
1024  */
1025 static bool keepalive_fn(const struct timeval *now, void *private_data)
1026 {
1027         if (!send_keepalive(smbd_server_fd())) {
1028                 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1029                 return False;
1030         }
1031         return True;
1032 }
1033
1034 /*
1035  * Do the recurring check if we're idle
1036  */
1037 static bool deadtime_fn(const struct timeval *now, void *private_data)
1038 {
1039         if ((conn_num_open() == 0)
1040             || (conn_idle_all(now->tv_sec))) {
1041                 DEBUG( 2, ( "Closing idle connection\n" ) );
1042                 messaging_send(smbd_messaging_context(), procid_self(),
1043                                MSG_SHUTDOWN, &data_blob_null);
1044                 return False;
1045         }
1046
1047         return True;
1048 }
1049
1050
1051 /****************************************************************************
1052  main program.
1053 ****************************************************************************/
1054
1055 /* Declare prototype for build_options() to avoid having to run it through
1056    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
1057    prototype generation system is too complicated. */
1058
1059 extern void build_options(bool screen);
1060
1061  int main(int argc,const char *argv[])
1062 {
1063         /* shall I run as a daemon */
1064         static bool is_daemon = False;
1065         static bool interactive = False;
1066         static bool Fork = True;
1067         static bool no_process_group = False;
1068         static bool log_stdout = False;
1069         static char *ports = NULL;
1070         static char *profile_level = NULL;
1071         int opt;
1072         poptContext pc;
1073         bool print_build_options = False;
1074         enum {
1075                 OPT_DAEMON = 1000,
1076                 OPT_INTERACTIVE,
1077                 OPT_FORK,
1078                 OPT_NO_PROCESS_GROUP,
1079                 OPT_LOG_STDOUT
1080         };
1081         struct poptOption long_options[] = {
1082         POPT_AUTOHELP
1083         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1084         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1085         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1086         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1087         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1088         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1089         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1090         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1091         POPT_COMMON_SAMBA
1092         POPT_COMMON_DYNCONFIG
1093         POPT_TABLEEND
1094         };
1095         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1096
1097         TimeInit();
1098
1099         db_tdb2_setup_messaging(NULL, false);
1100
1101 #ifdef HAVE_SET_AUTH_PARAMETERS
1102         set_auth_parameters(argc,argv);
1103 #endif
1104
1105         pc = poptGetContext("smbd", argc, argv, long_options, 0);
1106         while((opt = poptGetNextOpt(pc)) != -1) {
1107                 switch (opt)  {
1108                 case OPT_DAEMON:
1109                         is_daemon = true;
1110                         break;
1111                 case OPT_INTERACTIVE:
1112                         interactive = true;
1113                         break;
1114                 case OPT_FORK:
1115                         Fork = false;
1116                         break;
1117                 case OPT_NO_PROCESS_GROUP:
1118                         no_process_group = true;
1119                         break;
1120                 case OPT_LOG_STDOUT:
1121                         log_stdout = true;
1122                         break;
1123                 case 'b':
1124                         print_build_options = True;
1125                         break;
1126                 default:
1127                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1128                                   poptBadOption(pc, 0), poptStrerror(opt));
1129                         poptPrintUsage(pc, stderr, 0);
1130                         exit(1);
1131                 }
1132         }
1133         poptFreeContext(pc);
1134
1135         if (interactive) {
1136                 Fork = False;
1137                 log_stdout = True;
1138         }
1139
1140         setup_logging(argv[0],log_stdout);
1141
1142         if (print_build_options) {
1143                 build_options(True); /* Display output to screen as well as debug */
1144                 exit(0);
1145         }
1146
1147         load_case_tables();
1148
1149 #ifdef HAVE_SETLUID
1150         /* needed for SecureWare on SCO */
1151         setluid(0);
1152 #endif
1153
1154         sec_init();
1155
1156         set_remote_machine_name("smbd", False);
1157
1158         if (interactive && (DEBUGLEVEL >= 9)) {
1159                 talloc_enable_leak_report();
1160         }
1161
1162         if (log_stdout && Fork) {
1163                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1164                 exit(1);
1165         }
1166
1167         /* we want to re-seed early to prevent time delays causing
1168            client problems at a later date. (tridge) */
1169         generate_random_buffer(NULL, 0);
1170
1171         /* make absolutely sure we run as root - to handle cases where people
1172            are crazy enough to have it setuid */
1173
1174         gain_root_privilege();
1175         gain_root_group_privilege();
1176
1177         fault_setup((void (*)(void *))exit_server_fault);
1178         dump_core_setup("smbd");
1179
1180         CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
1181         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
1182
1183         /* we are never interested in SIGPIPE */
1184         BlockSignals(True,SIGPIPE);
1185
1186 #if defined(SIGFPE)
1187         /* we are never interested in SIGFPE */
1188         BlockSignals(True,SIGFPE);
1189 #endif
1190
1191 #if defined(SIGUSR2)
1192         /* We are no longer interested in USR2 */
1193         BlockSignals(True,SIGUSR2);
1194 #endif
1195
1196         /* POSIX demands that signals are inherited. If the invoking process has
1197          * these signals masked, we will have problems, as we won't recieve them. */
1198         BlockSignals(False, SIGHUP);
1199         BlockSignals(False, SIGUSR1);
1200         BlockSignals(False, SIGTERM);
1201
1202         /* we want total control over the permissions on created files,
1203            so set our umask to 0 */
1204         umask(0);
1205
1206         init_sec_ctx();
1207
1208         reopen_logs();
1209
1210         DEBUG(0,("smbd version %s started.\n", SAMBA_VERSION_STRING));
1211         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1212
1213         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1214                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1215
1216         /* Output the build options to the debug log */
1217         build_options(False);
1218
1219         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1220                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1221                 exit(1);
1222         }
1223
1224         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1225                 DEBUG(0, ("error opening config file\n"));
1226                 exit(1);
1227         }
1228
1229         if (smbd_messaging_context() == NULL)
1230                 exit(1);
1231
1232         /*
1233          * Do this before reload_services.
1234          */
1235         db_tdb2_setup_messaging(smbd_messaging_context(), true);
1236
1237         if (!reload_services(False))
1238                 return(-1);
1239
1240         init_structs();
1241
1242 #ifdef WITH_PROFILE
1243         if (!profile_setup(smbd_messaging_context(), False)) {
1244                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1245                 return -1;
1246         }
1247         if (profile_level != NULL) {
1248                 int pl = atoi(profile_level);
1249                 struct server_id src;
1250
1251                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1252                 src.pid = getpid();
1253                 set_profile_level(pl, src);
1254         }
1255 #endif
1256
1257         DEBUG(3,( "loaded services\n"));
1258
1259         if (!is_daemon && !is_a_socket(0)) {
1260                 if (!interactive)
1261                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1262
1263                 /*
1264                  * Setting is_daemon here prevents us from eventually calling
1265                  * the open_sockets_inetd()
1266                  */
1267
1268                 is_daemon = True;
1269         }
1270
1271         if (is_daemon && !interactive) {
1272                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1273                 become_daemon(Fork, no_process_group);
1274         }
1275
1276 #if HAVE_SETPGID
1277         /*
1278          * If we're interactive we want to set our own process group for
1279          * signal management.
1280          */
1281         if (interactive && !no_process_group)
1282                 setpgid( (pid_t)0, (pid_t)0);
1283 #endif
1284
1285         if (!directory_exist(lp_lockdir(), NULL))
1286                 mkdir(lp_lockdir(), 0755);
1287
1288         if (is_daemon)
1289                 pidfile_create("smbd");
1290
1291         if (!reinit_after_fork(smbd_messaging_context(),
1292                                smbd_event_context(), false)) {
1293                 DEBUG(0,("reinit_after_fork() failed\n"));
1294                 exit(1);
1295         }
1296
1297         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1298
1299         if (smbd_memcache() == NULL) {
1300                 exit(1);
1301         }
1302
1303         memcache_set_global(smbd_memcache());
1304
1305         /* Initialise the password backed before the global_sam_sid
1306            to ensure that we fetch from ldap before we make a domain sid up */
1307
1308         if(!initialize_password_db(False, smbd_event_context()))
1309                 exit(1);
1310
1311         if (!secrets_init()) {
1312                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1313                 exit(1);
1314         }
1315
1316         if(!get_global_sam_sid()) {
1317                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1318                 exit(1);
1319         }
1320
1321         if (!session_init())
1322                 exit(1);
1323
1324         if (!connections_init(True))
1325                 exit(1);
1326
1327         if (!locking_init())
1328                 exit(1);
1329
1330         namecache_enable();
1331
1332         if (!W_ERROR_IS_OK(registry_init_full()))
1333                 exit(1);
1334
1335 #if 0
1336         if (!init_svcctl_db())
1337                 exit(1);
1338 #endif
1339
1340         if (!print_backend_init(smbd_messaging_context()))
1341                 exit(1);
1342
1343         if (!init_guest_info()) {
1344                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1345                 return -1;
1346         }
1347
1348         /* only start the background queue daemon if we are
1349            running as a daemon -- bad things will happen if
1350            smbd is launched via inetd and we fork a copy of
1351            ourselves here */
1352
1353         if (is_daemon && !interactive
1354             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1355                 start_background_queue();
1356         }
1357
1358         if (!open_sockets_smbd(is_daemon, interactive, ports))
1359                 exit(1);
1360
1361         /*
1362          * everything after this point is run after the fork()
1363          */
1364
1365         static_init_rpc;
1366
1367         init_modules();
1368
1369         /* Possibly reload the services file. Only worth doing in
1370          * daemon mode. In inetd mode, we know we only just loaded this.
1371          */
1372         if (is_daemon) {
1373                 reload_services(True);
1374         }
1375
1376         if (!init_account_policy()) {
1377                 DEBUG(0,("Could not open account policy tdb.\n"));
1378                 exit(1);
1379         }
1380
1381         if (*lp_rootdir()) {
1382                 if (sys_chroot(lp_rootdir()) != 0) {
1383                         DEBUG(0,("Failed to change root to %s\n", lp_rootdir()));
1384                         exit(1);
1385                 }
1386                 if (chdir("/") == -1) {
1387                         DEBUG(0,("Failed to chdir to / on chroot to %s\n", lp_rootdir()));
1388                         exit(1);
1389                 }
1390                 DEBUG(0,("Changed root to %s\n", lp_rootdir()));
1391         }
1392
1393         /* Setup oplocks */
1394         if (!init_oplocks(smbd_messaging_context()))
1395                 exit(1);
1396
1397         /* Setup aio signal handler. */
1398         initialize_async_io_handler();
1399
1400         /* register our message handlers */
1401         messaging_register(smbd_messaging_context(), NULL,
1402                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
1403         messaging_register(smbd_messaging_context(), NULL,
1404                            MSG_SMB_RELEASE_IP, msg_release_ip);
1405         messaging_register(smbd_messaging_context(), NULL,
1406                            MSG_SMB_CLOSE_FILE, msg_close_file);
1407
1408         if ((lp_keepalive() != 0)
1409             && !(event_add_idle(smbd_event_context(), NULL,
1410                                 timeval_set(lp_keepalive(), 0),
1411                                 "keepalive", keepalive_fn,
1412                                 NULL))) {
1413                 DEBUG(0, ("Could not add keepalive event\n"));
1414                 exit(1);
1415         }
1416
1417         if (!(event_add_idle(smbd_event_context(), NULL,
1418                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
1419                              "deadtime", deadtime_fn, NULL))) {
1420                 DEBUG(0, ("Could not add deadtime event\n"));
1421                 exit(1);
1422         }
1423
1424 #ifdef CLUSTER_SUPPORT
1425
1426         if (lp_clustering()) {
1427                 /*
1428                  * We need to tell ctdb about our client's TCP
1429                  * connection, so that for failover ctdbd can send
1430                  * tickle acks, triggering a reconnection by the
1431                  * client.
1432                  */
1433
1434                 struct sockaddr_in srv, clnt;
1435
1436                 if (client_get_tcp_info(&srv, &clnt) == 0) {
1437
1438                         NTSTATUS status;
1439
1440                         status = ctdbd_register_ips(
1441                                 messaging_ctdbd_connection(),
1442                                 &srv, &clnt, release_ip, NULL);
1443
1444                         if (!NT_STATUS_IS_OK(status)) {
1445                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
1446                                           nt_errstr(status)));
1447                         }
1448                 } else
1449                 {
1450                         DEBUG(0,("Unable to get tcp info for "
1451                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
1452                                  strerror(errno)));
1453                 }
1454         }
1455
1456 #endif
1457
1458         TALLOC_FREE(frame);
1459
1460         smbd_process();
1461
1462         namecache_shutdown();
1463
1464         exit_server_cleanly(NULL);
1465         return(0);
1466 }