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,"",FLAG_MSG_GENERAL|FLAG_MSG_SMBD);
 557
 558         /* Listen to messages */
 559
 560         messaging_register(smbd_messaging_context(), NULL,
 561                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 562         messaging_register(smbd_messaging_context(), NULL,
 563                            MSG_SHUTDOWN, msg_exit_server);
 564         messaging_register(smbd_messaging_context(), NULL,
 565                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 566         messaging_register(smbd_messaging_context(), NULL,
 567                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 568         messaging_register(smbd_messaging_context(), NULL,
 569                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 570         brl_register_msgs(smbd_messaging_context());
 571
 572 #ifdef DEVELOPER
 573         messaging_register(smbd_messaging_context(), NULL,
 574                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 575 #endif
 576
 577         /* now accept incoming connections - forking a new process
 578            for each incoming connection */
 579         DEBUG(2,("waiting for a connection\n"));
 580         while (1) {
 581                 struct timeval now, idle_timeout;
 582                 fd_set r_fds, w_fds;
 583                 int num;
 584
 585                 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
 586                 message_dispatch(smbd_messaging_context());
 587
 588                 if (got_sig_cld) {
 589                         pid_t pid;
 590                         int status;
 591
 592                         got_sig_cld = False;
 593
 594                         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 595                                 bool unclean_shutdown = False;
 596
 597                                 /* If the child terminated normally, assume
 598                                    it was an unclean shutdown unless the
 599                                    status is 0
 600                                 */
 601                                 if (WIFEXITED(status)) {
 602                                         unclean_shutdown = WEXITSTATUS(status);
 603                                 }
 604                                 /* If the child terminated due to a signal
 605                                    we always assume it was unclean.
 606                                 */
 607                                 if (WIFSIGNALED(status)) {
 608                                         unclean_shutdown = True;
 609                                 }
 610                                 remove_child_pid(pid, unclean_shutdown);
 611                         }
 612                 }
 613
 614                 idle_timeout = timeval_zero();
 615
 616                 memcpy((char *)&r_fds, (char *)&listen_set,
 617                        sizeof(listen_set));
 618                 FD_ZERO(&w_fds);
 619                 GetTimeOfDay(&now);
 620
 621                 /* Kick off our mDNS registration. */
 622                 if (dns_port != 0) {
 623                         dns_register_smbd(&dns_reg, dns_port, &maxfd,
 624                                         &r_fds, &idle_timeout);
 625                 }
 626
 627                 event_add_to_select_args(smbd_event_context(), &now,
 628                                          &r_fds, &w_fds, &idle_timeout,
 629                                          &maxfd);
 630
 631                 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
 632                                  timeval_is_zero(&idle_timeout) ?
 633                                  NULL : &idle_timeout);
 634
 635                 if (num == -1 && errno == EINTR) {
 636                         if (got_sig_term) {
 637                                 exit_server_cleanly(NULL);
 638                         }
 639
 640                         /* check for sighup processing */
 641                         if (reload_after_sighup) {
 642                                 change_to_root_user();
 643                                 DEBUG(1,("Reloading services after SIGHUP\n"));
 644                                 reload_services(False);
 645                                 reload_after_sighup = 0;
 646                         }
 647
 648                         continue;
 649                 }
 650
 651
 652                 /* If the idle timeout fired and we don't have any connected
 653                  * users, exit gracefully. We should be running under a process
 654                  * controller that will restart us if necessry.
 655                  */
 656                 if (num == 0 && count_all_current_connections() == 0) {
 657                         exit_server_cleanly("idle timeout");
 658                 }
 659
 660                 /* process pending nDNS responses */
 661                 if (dns_register_smbd_reply(dns_reg, &r_fds, &idle_timeout)) {
 662                         --num;
 663                 }
 664
 665                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 666                         continue;
 667                 }
 668
 669                 /* check if we need to reload services */
 670                 check_reload(time(NULL));
 671
 672                 /* Find the sockets that are read-ready -
 673                    accept on these. */
 674                 for( ; num > 0; num--) {
 675                         struct sockaddr addr;
 676                         socklen_t in_addrlen = sizeof(addr);
 677                         pid_t child = 0;
 678
 679                         s = -1;
 680                         for(i = 0; i < num_sockets; i++) {
 681                                 if(FD_ISSET(fd_listenset[i],&r_fds)) {
 682                                         s = fd_listenset[i];
 683                                         /* Clear this so we don't look
 684                                            at it again. */
 685                                         FD_CLR(fd_listenset[i],&r_fds);
 686                                         break;
 687                                 }
 688                         }
 689
 690                         smbd_set_server_fd(accept(s,&addr,&in_addrlen));
 691
 692                         if (smbd_server_fd() == -1 && errno == EINTR)
 693                                 continue;
 694
 695                         if (smbd_server_fd() == -1) {
 696                                 DEBUG(2,("open_sockets_smbd: accept: %s\n",
 697                                          strerror(errno)));
 698                                 continue;
 699                         }
 700
 701                         /* Ensure child is set to blocking mode */
 702                         set_blocking(smbd_server_fd(),True);
 703
 704                         if (smbd_server_fd() != -1 && interactive)
 705                                 return True;
 706
 707                         if (allowable_number_of_smbd_processes() &&
 708                             smbd_server_fd() != -1 &&
 709                             ((child = sys_fork())==0)) {
 710                                 char remaddr[INET6_ADDRSTRLEN];
 711
 712                                 /* Child code ... */
 713
 714                                 /* Stop zombies, the parent explicitly handles
 715                                  * them, counting worker smbds. */
 716                                 CatchChild();
 717
 718                                 /* close the listening socket(s) */
 719                                 for(i = 0; i < num_sockets; i++)
 720                                         close(fd_listenset[i]);
 721
 722                                 /* close our mDNS daemon handle */
 723                                 dns_register_close(&dns_reg);
 724
 725                                 /* close our standard file
 726                                    descriptors */
 727                                 close_low_fds(False);
 728                                 am_parent = 0;
 729
 730                                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 731                                 set_socket_options(smbd_server_fd(),
 732                                                    lp_socket_options());
 733
 734                                 /* this is needed so that we get decent entries
 735                                    in smbstatus for port 445 connects */
 736                                 set_remote_machine_name(get_peer_addr(smbd_server_fd(),
 737                                                                 remaddr,
 738                                                                 sizeof(remaddr)),
 739                                                                 false);
 740
 741                                 /* Reset the state of the random
 742                                  * number generation system, so
 743                                  * children do not get the same random
 744                                  * numbers as each other */
 745
 746                                 set_need_random_reseed();
 747                                 /* tdb needs special fork handling - remove
 748                                  * CLEAR_IF_FIRST flags */
 749                                 if (tdb_reopen_all(1) == -1) {
 750                                         DEBUG(0,("tdb_reopen_all failed.\n"));
 751                                         smb_panic("tdb_reopen_all failed");
 752                                 }
 753
 754                                 return True;
 755                         }
 756                         /* The parent doesn't need this socket */
 757                         close(smbd_server_fd());
 758
 759                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 760                                 Clear the closed fd info out of server_fd --
 761                                 and more importantly, out of client_fd in
 762                                 util_sock.c, to avoid a possible
 763                                 getpeername failure if we reopen the logs
 764                                 and use %I in the filename.
 765                         */
 766
 767                         smbd_set_server_fd(-1);
 768
 769                         if (child != 0) {
 770                                 add_child_pid(child);
 771                         }
 772
 773                         /* Force parent to check log size after
 774                          * spawning child.  Fix from
 775                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 776                          * parent smbd will log to logserver.smb.  It
 777                          * writes only two messages for each child
 778                          * started/finished. But each child writes,
 779                          * say, 50 messages also in logserver.smb,
 780                          * begining with the debug_count of the
 781                          * parent, before the child opens its own log
 782                          * file logserver.client. In a worst case
 783                          * scenario the size of logserver.smb would be
 784                          * checked after about 50*50=2500 messages
 785                          * (ca. 100kb).
 786                          * */
 787                         force_check_log_size();
 788
 789                 } /* end for num */
 790         } /* end while 1 */
 791
 792 /* NOTREACHED   return True; */
 793 }
 794
 795 /****************************************************************************
 796  Reload printers
 797 **************************************************************************/
 798 void reload_printers(void)
 799 {
 800         int snum;
 801         int n_services = lp_numservices();
 802         int pnum = lp_servicenumber(PRINTERS_NAME);
 803         const char *pname;
 804
 805         pcap_cache_reload();
 806
 807         /* remove stale printers */
 808         for (snum = 0; snum < n_services; snum++) {
 809                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 810                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 811                                       lp_autoloaded(snum)))
 812                         continue;
 813
 814                 pname = lp_printername(snum);
 815                 if (!pcap_printername_ok(pname)) {
 816                         DEBUG(3, ("removing stale printer %s\n", pname));
 817
 818                         if (is_printer_published(NULL, snum, NULL))
 819                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 820                         del_a_printer(pname);
 821                         lp_killservice(snum);
 822                 }
 823         }
 824
 825         load_printers();
 826 }
 827
 828 /****************************************************************************
 829  Reload the services file.
 830 **************************************************************************/
 831
 832 bool reload_services(bool test)
 833 {
 834         bool ret;
 835
 836         if (lp_loaded()) {
 837                 char *fname = lp_configfile();
 838                 if (file_exist(fname, NULL) &&
 839                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 840                         set_dyn_CONFIGFILE(fname);
 841                         test = False;
 842                 }
 843         }
 844
 845         reopen_logs();
 846
 847         if (test && !lp_file_list_changed())
 848                 return(True);
 849
 850         lp_killunused(conn_snum_used);
 851
 852         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 853
 854         reload_printers();
 855
 856         /* perhaps the config filename is now set */
 857         if (!test)
 858                 reload_services(True);
 859
 860         reopen_logs();
 861
 862         load_interfaces();
 863
 864         if (smbd_server_fd() != -1) {
 865                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 866                 set_socket_options(smbd_server_fd(), lp_socket_options());
 867         }
 868
 869         mangle_reset_cache();
 870         reset_stat_cache();
 871
 872         /* this forces service parameters to be flushed */
 873         set_current_service(NULL,0,True);
 874
 875         return(ret);
 876 }
 877
 878 /****************************************************************************
 879  Exit the server.
 880 ****************************************************************************/
 881
 882 /* Reasons for shutting down a server process. */
 883 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 884
 885 static void exit_server_common(enum server_exit_reason how,
 886         const char *const reason) NORETURN_ATTRIBUTE;
 887
 888 static void exit_server_common(enum server_exit_reason how,
 889         const char *const reason)
 890 {
 891         static int firsttime=1;
 892
 893         if (!firsttime)
 894                 exit(0);
 895         firsttime = 0;
 896
 897         change_to_root_user();
 898
 899         if (negprot_global_auth_context) {
 900                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 901         }
 902
 903         conn_close_all();
 904
 905         invalidate_all_vuids();
 906
 907         /* 3 second timeout. */
 908         print_notify_send_messages(smbd_messaging_context(), 3);
 909
 910         /* delete our entry in the connections database. */
 911         yield_connection(NULL,"");
 912
 913         respond_to_all_remaining_local_messages();
 914
 915 #ifdef WITH_DFS
 916         if (dcelogin_atmost_once) {
 917                 dfs_unlogin();
 918         }
 919 #endif
 920
 921 #ifdef USE_DMAPI
 922         /* Destroy Samba DMAPI session only if we are master smbd process */
 923         if (am_parent) {
 924                 if (!dmapi_destroy_session()) {
 925                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 926                 }
 927         }
 928 #endif
 929
 930         locking_end();
 931         printing_end();
 932
 933         if (how != SERVER_EXIT_NORMAL) {
 934                 int oldlevel = DEBUGLEVEL;
 935
 936                 DEBUGLEVEL = 10;
 937
 938                 DEBUGSEP(0);
 939                 DEBUG(0,("Abnormal server exit: %s\n",
 940                         reason ? reason : "no explanation provided"));
 941                 DEBUGSEP(0);
 942
 943                 log_stack_trace();
 944
 945                 DEBUGLEVEL = oldlevel;
 946                 dump_core();
 947
 948         } else {
 949                 DEBUG(3,("Server exit (%s)\n",
 950                         (reason ? reason : "normal exit")));
 951         }
 952
 953         exit(0);
 954 }
 955
 956 void exit_server(const char *const explanation)
 957 {
 958         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 959 }
 960
 961 void exit_server_cleanly(const char *const explanation)
 962 {
 963         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 964 }
 965
 966 void exit_server_fault(void)
 967 {
 968         exit_server("critical server fault");
 969 }
 970
 971
 972 /****************************************************************************
 973 received when we should release a specific IP
 974 ****************************************************************************/
 975 static void release_ip(const char *ip, void *priv)
 976 {
 977         char addr[INET6_ADDRSTRLEN];
 978
 979         if (strcmp(client_socket_addr(get_client_fd(),addr,sizeof(addr)), ip) == 0) {
 980                 /* we can't afford to do a clean exit - that involves
 981                    database writes, which would potentially mean we
 982                    are still running after the failover has finished -
 983                    we have to get rid of this process ID straight
 984                    away */
 985                 DEBUG(0,("Got release IP message for our IP %s - exiting immediately\n",
 986                         ip));
 987                 _exit(0);
 988         }
 989 }
 990
 991 static void msg_release_ip(struct messaging_context *msg_ctx, void *private_data,
 992                            uint32_t msg_type, struct server_id server_id, DATA_BLOB *data)
 993 {
 994         release_ip((char *)data->data, NULL);
 995 }
 996
 997 /****************************************************************************
 998  Initialise connect, service and file structs.
 999 ****************************************************************************/
1000
1001 static bool init_structs(void )
1002 {
1003         /*
1004          * Set the machine NETBIOS name if not already
1005          * set from the config file.
1006          */
1007
1008         if (!init_names())
1009                 return False;
1010
1011         conn_init();
1012
1013         file_init();
1014
1015         /* for RPC pipes */
1016         init_rpc_pipe_hnd();
1017
1018         init_dptrs();
1019
1020         if (!secrets_init())
1021                 return False;
1022
1023         return True;
1024 }
1025
1026 /*
1027  * Send keepalive packets to our client
1028  */
1029 static bool keepalive_fn(const struct timeval *now, void *private_data)
1030 {
1031         if (!send_keepalive(smbd_server_fd())) {
1032                 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
1033                 return False;
1034         }
1035         return True;
1036 }
1037
1038 /*
1039  * Do the recurring check if we're idle
1040  */
1041 static bool deadtime_fn(const struct timeval *now, void *private_data)
1042 {
1043         if ((conn_num_open() == 0)
1044             || (conn_idle_all(now->tv_sec))) {
1045                 DEBUG( 2, ( "Closing idle connection\n" ) );
1046                 messaging_send(smbd_messaging_context(), procid_self(),
1047                                MSG_SHUTDOWN, &data_blob_null);
1048                 return False;
1049         }
1050
1051         return True;
1052 }
1053
1054
1055 /****************************************************************************
1056  main program.
1057 ****************************************************************************/
1058
1059 /* Declare prototype for build_options() to avoid having to run it through
1060    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
1061    prototype generation system is too complicated. */
1062
1063 extern void build_options(bool screen);
1064
1065  int main(int argc,const char *argv[])
1066 {
1067         /* shall I run as a daemon */
1068         static bool is_daemon = False;
1069         static bool interactive = False;
1070         static bool Fork = True;
1071         static bool no_process_group = False;
1072         static bool log_stdout = False;
1073         static char *ports = NULL;
1074         static char *profile_level = NULL;
1075         int opt;
1076         poptContext pc;
1077         bool print_build_options = False;
1078         enum {
1079                 OPT_DAEMON = 1000,
1080                 OPT_INTERACTIVE,
1081                 OPT_FORK,
1082                 OPT_NO_PROCESS_GROUP,
1083                 OPT_LOG_STDOUT
1084         };
1085         struct poptOption long_options[] = {
1086         POPT_AUTOHELP
1087         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1088         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1089         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1090         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1091         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1092         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1093         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1094         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1095         POPT_COMMON_SAMBA
1096         POPT_COMMON_DYNCONFIG
1097         POPT_TABLEEND
1098         };
1099         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1100
1101         TimeInit();
1102
1103 #ifdef HAVE_SET_AUTH_PARAMETERS
1104         set_auth_parameters(argc,argv);
1105 #endif
1106
1107         pc = poptGetContext("smbd", argc, argv, long_options, 0);
1108         while((opt = poptGetNextOpt(pc)) != -1) {
1109                 switch (opt)  {
1110                 case OPT_DAEMON:
1111                         is_daemon = true;
1112                         break;
1113                 case OPT_INTERACTIVE:
1114                         interactive = true;
1115                         break;
1116                 case OPT_FORK:
1117                         Fork = false;
1118                         break;
1119                 case OPT_NO_PROCESS_GROUP:
1120                         no_process_group = true;
1121                         break;
1122                 case OPT_LOG_STDOUT:
1123                         log_stdout = true;
1124                         break;
1125                 case 'b':
1126                         print_build_options = True;
1127                         break;
1128                 default:
1129                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1130                                   poptBadOption(pc, 0), poptStrerror(opt));
1131                         poptPrintUsage(pc, stderr, 0);
1132                         exit(1);
1133                 }
1134         }
1135         poptFreeContext(pc);
1136
1137         if (interactive) {
1138                 Fork = False;
1139                 log_stdout = True;
1140         }
1141
1142         setup_logging(argv[0],log_stdout);
1143
1144         if (print_build_options) {
1145                 build_options(True); /* Display output to screen as well as debug */
1146                 exit(0);
1147         }
1148
1149         load_case_tables();
1150
1151 #ifdef HAVE_SETLUID
1152         /* needed for SecureWare on SCO */
1153         setluid(0);
1154 #endif
1155
1156         sec_init();
1157
1158         set_remote_machine_name("smbd", False);
1159
1160         if (interactive && (DEBUGLEVEL >= 9)) {
1161                 talloc_enable_leak_report();
1162         }
1163
1164         if (log_stdout && Fork) {
1165                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1166                 exit(1);
1167         }
1168
1169         /* we want to re-seed early to prevent time delays causing
1170            client problems at a later date. (tridge) */
1171         generate_random_buffer(NULL, 0);
1172
1173         /* make absolutely sure we run as root - to handle cases where people
1174            are crazy enough to have it setuid */
1175
1176         gain_root_privilege();
1177         gain_root_group_privilege();
1178
1179         fault_setup((void (*)(void *))exit_server_fault);
1180         dump_core_setup("smbd");
1181
1182         CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
1183         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
1184
1185         /* we are never interested in SIGPIPE */
1186         BlockSignals(True,SIGPIPE);
1187
1188 #if defined(SIGFPE)
1189         /* we are never interested in SIGFPE */
1190         BlockSignals(True,SIGFPE);
1191 #endif
1192
1193 #if defined(SIGUSR2)
1194         /* We are no longer interested in USR2 */
1195         BlockSignals(True,SIGUSR2);
1196 #endif
1197
1198         /* POSIX demands that signals are inherited. If the invoking process has
1199          * these signals masked, we will have problems, as we won't recieve them. */
1200         BlockSignals(False, SIGHUP);
1201         BlockSignals(False, SIGUSR1);
1202         BlockSignals(False, SIGTERM);
1203
1204         /* we want total control over the permissions on created files,
1205            so set our umask to 0 */
1206         umask(0);
1207
1208         init_sec_ctx();
1209
1210         reopen_logs();
1211
1212         DEBUG(0,("smbd version %s started.\n", SAMBA_VERSION_STRING));
1213         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1214
1215         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1216                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1217
1218         /* Output the build options to the debug log */
1219         build_options(False);
1220
1221         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1222                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1223                 exit(1);
1224         }
1225
1226         /*
1227          * Do this before reload_services.
1228          */
1229
1230         if (!reload_services(False))
1231                 return(-1);
1232
1233         init_structs();
1234
1235 #ifdef WITH_PROFILE
1236         if (!profile_setup(smbd_messaging_context(), False)) {
1237                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1238                 return -1;
1239         }
1240         if (profile_level != NULL) {
1241                 int pl = atoi(profile_level);
1242                 struct server_id src;
1243
1244                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1245                 src.pid = getpid();
1246                 set_profile_level(pl, src);
1247         }
1248 #endif
1249
1250         DEBUG(3,( "loaded services\n"));
1251
1252         if (!is_daemon && !is_a_socket(0)) {
1253                 if (!interactive)
1254                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1255
1256                 /*
1257                  * Setting is_daemon here prevents us from eventually calling
1258                  * the open_sockets_inetd()
1259                  */
1260
1261                 is_daemon = True;
1262         }
1263
1264         if (is_daemon && !interactive) {
1265                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1266                 become_daemon(Fork, no_process_group);
1267         }
1268
1269 #if HAVE_SETPGID
1270         /*
1271          * If we're interactive we want to set our own process group for
1272          * signal management.
1273          */
1274         if (interactive && !no_process_group)
1275                 setpgid( (pid_t)0, (pid_t)0);
1276 #endif
1277
1278         if (!directory_exist(lp_lockdir(), NULL))
1279                 mkdir(lp_lockdir(), 0755);
1280
1281         if (is_daemon)
1282                 pidfile_create("smbd");
1283
1284         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1285
1286         if (smbd_messaging_context() == NULL)
1287                 exit(1);
1288
1289         if (smbd_memcache() == NULL) {
1290                 exit(1);
1291         }
1292
1293         memcache_set_global(smbd_memcache());
1294
1295         /* Initialise the password backed before the global_sam_sid
1296            to ensure that we fetch from ldap before we make a domain sid up */
1297
1298         if(!initialize_password_db(False, smbd_event_context()))
1299                 exit(1);
1300
1301         if (!secrets_init()) {
1302                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1303                 exit(1);
1304         }
1305
1306         if(!get_global_sam_sid()) {
1307                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1308                 exit(1);
1309         }
1310
1311         if (!session_init())
1312                 exit(1);
1313
1314         if (!connections_init(True))
1315                 exit(1);
1316
1317         if (!locking_init())
1318                 exit(1);
1319
1320         namecache_enable();
1321
1322         if (!init_registry())
1323                 exit(1);
1324
1325 #if 0
1326         if (!init_svcctl_db())
1327                 exit(1);
1328 #endif
1329
1330         if (!print_backend_init(smbd_messaging_context()))
1331                 exit(1);
1332
1333         if (!init_guest_info()) {
1334                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1335                 return -1;
1336         }
1337
1338         /* only start the background queue daemon if we are
1339            running as a daemon -- bad things will happen if
1340            smbd is launched via inetd and we fork a copy of
1341            ourselves here */
1342
1343         if ( is_daemon && !interactive )
1344                 start_background_queue();
1345
1346         if (!open_sockets_smbd(is_daemon, interactive, ports))
1347                 exit(1);
1348
1349         /*
1350          * everything after this point is run after the fork()
1351          */
1352
1353         static_init_rpc;
1354
1355         init_modules();
1356
1357         /* Possibly reload the services file. Only worth doing in
1358          * daemon mode. In inetd mode, we know we only just loaded this.
1359          */
1360         if (is_daemon) {
1361                 reload_services(True);
1362         }
1363
1364         if (!init_account_policy()) {
1365                 DEBUG(0,("Could not open account policy tdb.\n"));
1366                 exit(1);
1367         }
1368
1369         if (*lp_rootdir()) {
1370                 if (sys_chroot(lp_rootdir()) == 0)
1371                         DEBUG(2,("Changed root to %s\n", lp_rootdir()));
1372         }
1373
1374         /* Setup oplocks */
1375         if (!init_oplocks(smbd_messaging_context()))
1376                 exit(1);
1377
1378         /* Setup aio signal handler. */
1379         initialize_async_io_handler();
1380
1381         /*
1382          * For clustering, we need to re-init our ctdbd connection after the
1383          * fork
1384          */
1385         if (!NT_STATUS_IS_OK(messaging_reinit(smbd_messaging_context())))
1386                 exit(1);
1387
1388         /* register our message handlers */
1389         messaging_register(smbd_messaging_context(), NULL,
1390                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
1391         messaging_register(smbd_messaging_context(), NULL,
1392                            MSG_SMB_RELEASE_IP, msg_release_ip);
1393
1394         if ((lp_keepalive() != 0)
1395             && !(event_add_idle(smbd_event_context(), NULL,
1396                                 timeval_set(lp_keepalive(), 0),
1397                                 "keepalive", keepalive_fn,
1398                                 NULL))) {
1399                 DEBUG(0, ("Could not add keepalive event\n"));
1400                 exit(1);
1401         }
1402
1403         if (!(event_add_idle(smbd_event_context(), NULL,
1404                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
1405                              "deadtime", deadtime_fn, NULL))) {
1406                 DEBUG(0, ("Could not add deadtime event\n"));
1407                 exit(1);
1408         }
1409
1410 #ifdef CLUSTER_SUPPORT
1411
1412         if (lp_clustering()) {
1413                 /*
1414                  * We need to tell ctdb about our client's TCP
1415                  * connection, so that for failover ctdbd can send
1416                  * tickle acks, triggering a reconnection by the
1417                  * client.
1418                  */
1419
1420                 struct sockaddr_in srv, clnt;
1421
1422                 if (client_get_tcp_info(&srv, &clnt) == 0) {
1423
1424                         NTSTATUS status;
1425
1426                         status = ctdbd_register_ips(
1427                                 messaging_ctdbd_connection(),
1428                                 &srv, &clnt, release_ip, NULL);
1429
1430                         if (!NT_STATUS_IS_OK(status)) {
1431                                 DEBUG(0, ("ctdbd_register_ips failed: %s\n",
1432                                           nt_errstr(status)));
1433                         }
1434                 } else
1435                 {
1436                         DEBUG(0,("Unable to get tcp info for "
1437                                  "CTDB_CONTROL_TCP_CLIENT: %s\n",
1438                                  strerror(errno)));
1439                 }
1440         }
1441
1442 #endif
1443
1444         TALLOC_FREE(frame);
1445
1446         smbd_process();
1447
1448         namecache_shutdown();
1449
1450         exit_server_cleanly(NULL);
1451         return(0);
1452 }