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