source3/smbd/server.c

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