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 #include "smbd/globals.h"
  26
  27 static_decl_rpc;
  28
  29 #ifdef WITH_DFS
  30 extern int dcelogin_atmost_once;
  31 #endif /* WITH_DFS */
  32
  33 int smbd_server_fd(void)
  34 {
  35         return server_fd;
  36 }
  37
  38 static void smbd_set_server_fd(int fd)
  39 {
  40         server_fd = fd;
  41 }
  42
  43 int get_client_fd(void)
  44 {
  45         return server_fd;
  46 }
  47
  48 struct event_context *smbd_event_context(void)
  49 {
  50         if (!smbd_event_ctx) {
  51                 smbd_event_ctx = event_context_init(talloc_autofree_context());
  52         }
  53         if (!smbd_event_ctx) {
  54                 smb_panic("Could not init smbd event context");
  55         }
  56         return smbd_event_ctx;
  57 }
  58
  59 struct messaging_context *smbd_messaging_context(void)
  60 {
  61         if (smbd_msg_ctx == NULL) {
  62                 smbd_msg_ctx = messaging_init(talloc_autofree_context(),
  63                                               server_id_self(),
  64                                               smbd_event_context());
  65         }
  66         if (smbd_msg_ctx == NULL) {
  67                 DEBUG(0, ("Could not init smbd messaging context.\n"));
  68         }
  69         return smbd_msg_ctx;
  70 }
  71
  72 struct memcache *smbd_memcache(void)
  73 {
  74         if (!smbd_memcache_ctx) {
  75                 smbd_memcache_ctx = memcache_init(talloc_autofree_context(),
  76                                                   lp_max_stat_cache_size()*1024);
  77         }
  78         if (!smbd_memcache_ctx) {
  79                 smb_panic("Could not init smbd memcache");
  80         }
  81
  82         return smbd_memcache_ctx;
  83 }
  84
  85 /*******************************************************************
  86  What to do when smb.conf is updated.
  87  ********************************************************************/
  88
  89 static void smb_conf_updated(struct messaging_context *msg,
  90                              void *private_data,
  91                              uint32_t msg_type,
  92                              struct server_id server_id,
  93                              DATA_BLOB *data)
  94 {
  95         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
  96                   "updated. Reloading.\n"));
  97         change_to_root_user();
  98         reload_services(False);
  99 }
 100
 101
 102 /*******************************************************************
 103  Delete a statcache entry.
 104  ********************************************************************/
 105
 106 static void smb_stat_cache_delete(struct messaging_context *msg,
 107                                   void *private_data,
 108                                   uint32_t msg_tnype,
 109                                   struct server_id server_id,
 110                                   DATA_BLOB *data)
 111 {
 112         const char *name = (const char *)data->data;
 113         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 114         stat_cache_delete(name);
 115 }
 116
 117 /****************************************************************************
 118   Send a SIGTERM to our process group.
 119 *****************************************************************************/
 120
 121 static void  killkids(void)
 122 {
 123         if(am_parent) kill(0,SIGTERM);
 124 }
 125
 126 /****************************************************************************
 127  Process a sam sync message - not sure whether to do this here or
 128  somewhere else.
 129 ****************************************************************************/
 130
 131 static void msg_sam_sync(struct messaging_context *msg,
 132                          void *private_data,
 133                          uint32_t msg_type,
 134                          struct server_id server_id,
 135                          DATA_BLOB *data)
 136 {
 137         DEBUG(10, ("** sam sync message received, ignoring\n"));
 138 }
 139
 140 static void msg_exit_server(struct messaging_context *msg,
 141                             void *private_data,
 142                             uint32_t msg_type,
 143                             struct server_id server_id,
 144                             DATA_BLOB *data)
 145 {
 146         DEBUG(3, ("got a SHUTDOWN message\n"));
 147         exit_server_cleanly(NULL);
 148 }
 149
 150 #ifdef DEVELOPER
 151 static void msg_inject_fault(struct messaging_context *msg,
 152                              void *private_data,
 153                              uint32_t msg_type,
 154                              struct server_id src,
 155                              DATA_BLOB *data)
 156 {
 157         int sig;
 158
 159         if (data->length != sizeof(sig)) {
 160
 161                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 162                           procid_str_static(&src)));
 163                 return;
 164         }
 165
 166         sig = *(int *)data->data;
 167         if (sig == -1) {
 168                 exit_server("internal error injected");
 169                 return;
 170         }
 171
 172 #if HAVE_STRSIGNAL
 173         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 174                   procid_str_static(&src), sig, strsignal(sig)));
 175 #else
 176         DEBUG(0, ("Process %s requested injection of signal %d\n",
 177                   procid_str_static(&src), sig));
 178 #endif
 179
 180         kill(sys_getpid(), sig);
 181 }
 182 #endif /* DEVELOPER */
 183
 184 struct child_pid {
 185         struct child_pid *prev, *next;
 186         pid_t pid;
 187 };
 188
 189 static void add_child_pid(pid_t pid)
 190 {
 191         struct child_pid *child;
 192
 193         if (lp_max_smbd_processes() == 0) {
 194                 /* Don't bother with the child list if we don't care anyway */
 195                 return;
 196         }
 197
 198         child = SMB_MALLOC_P(struct child_pid);
 199         if (child == NULL) {
 200                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 201                 return;
 202         }
 203         child->pid = pid;
 204         DLIST_ADD(children, child);
 205         num_children += 1;
 206 }
 207
 208 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 209 {
 210         struct child_pid *child;
 211
 212         if (unclean_shutdown) {
 213                 /* a child terminated uncleanly so tickle all processes to see
 214                    if they can grab any of the pending locks
 215                 */
 216                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n", (unsigned int)pid));
 217                 messaging_send_buf(smbd_messaging_context(), procid_self(),
 218                                    MSG_SMB_BRL_VALIDATE, NULL, 0);
 219                 message_send_all(smbd_messaging_context(),
 220                                  MSG_SMB_UNLOCK, NULL, 0, NULL);
 221         }
 222
 223         if (lp_max_smbd_processes() == 0) {
 224                 /* Don't bother with the child list if we don't care anyway */
 225                 return;
 226         }
 227
 228         for (child = children; child != NULL; child = child->next) {
 229                 if (child->pid == pid) {
 230                         struct child_pid *tmp = child;
 231                         DLIST_REMOVE(children, child);
 232                         SAFE_FREE(tmp);
 233                         num_children -= 1;
 234                         return;
 235                 }
 236         }
 237
 238         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 239 }
 240
 241 /****************************************************************************
 242  Have we reached the process limit ?
 243 ****************************************************************************/
 244
 245 static bool allowable_number_of_smbd_processes(void)
 246 {
 247         int max_processes = lp_max_smbd_processes();
 248
 249         if (!max_processes)
 250                 return True;
 251
 252         return num_children < max_processes;
 253 }
 254
 255 static void smbd_sig_chld_handler(struct tevent_context *ev,
 256                                   struct tevent_signal *se,
 257                                   int signum,
 258                                   int count,
 259                                   void *siginfo,
 260                                   void *private_data)
 261 {
 262         pid_t pid;
 263         int status;
 264
 265         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 266                 bool unclean_shutdown = False;
 267
 268                 /* If the child terminated normally, assume
 269                    it was an unclean shutdown unless the
 270                    status is 0
 271                 */
 272                 if (WIFEXITED(status)) {
 273                         unclean_shutdown = WEXITSTATUS(status);
 274                 }
 275                 /* If the child terminated due to a signal
 276                    we always assume it was unclean.
 277                 */
 278                 if (WIFSIGNALED(status)) {
 279                         unclean_shutdown = True;
 280                 }
 281                 remove_child_pid(pid, unclean_shutdown);
 282         }
 283 }
 284
 285 static void smbd_setup_sig_chld_handler(void)
 286 {
 287         struct tevent_signal *se;
 288
 289         se = tevent_add_signal(smbd_event_context(),
 290                                smbd_event_context(),
 291                                SIGCHLD, 0,
 292                                smbd_sig_chld_handler,
 293                                NULL);
 294         if (!se) {
 295                 exit_server("failed to setup SIGCHLD handler");
 296         }
 297 }
 298
 299 struct smbd_open_socket;
 300
 301 struct smbd_parent_context {
 302         bool interactive;
 303
 304         /* the list of listening sockets */
 305         struct smbd_open_socket *sockets;
 306 };
 307
 308 struct smbd_open_socket {
 309         struct smbd_open_socket *prev, *next;
 310         struct smbd_parent_context *parent;
 311         int fd;
 312         struct tevent_fd *fde;
 313 };
 314
 315 static void smbd_open_socket_close_fn(struct tevent_context *ev,
 316                                       struct tevent_fd *fde,
 317                                       int fd,
 318                                       void *private_data)
 319 {
 320         /* this might be the socket_wrapper swrap_close() */
 321         close(fd);
 322 }
 323
 324 static void smbd_accept_connection(struct tevent_context *ev,
 325                                    struct tevent_fd *fde,
 326                                    uint16_t flags,
 327                                    void *private_data)
 328 {
 329         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
 330                                      struct smbd_open_socket);
 331         struct sockaddr_storage addr;
 332         socklen_t in_addrlen = sizeof(addr);
 333         pid_t pid = 0;
 334
 335         smbd_set_server_fd(accept(s->fd,(struct sockaddr *)&addr,&in_addrlen));
 336
 337         if (smbd_server_fd() == -1 && errno == EINTR)
 338                 return;
 339
 340         if (smbd_server_fd() == -1) {
 341                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 342                          strerror(errno)));
 343                 return;
 344         }
 345
 346         if (s->parent->interactive) {
 347                 smbd_process();
 348                 exit_server_cleanly("end of interactive mode");
 349                 return;
 350         }
 351
 352         if (!allowable_number_of_smbd_processes()) {
 353                 close(smbd_server_fd());
 354                 smbd_set_server_fd(-1);
 355                 return;
 356         }
 357
 358         pid = sys_fork();
 359         if (pid == 0) {
 360                 NTSTATUS status = NT_STATUS_OK;
 361                 /* Child code ... */
 362                 am_parent = 0;
 363
 364                 /* Stop zombies, the parent explicitly handles
 365                  * them, counting worker smbds. */
 366                 CatchChild();
 367
 368                 /* close our standard file
 369                    descriptors */
 370                 close_low_fds(False);
 371
 372                 /*
 373                  * Can't use TALLOC_FREE here. Nulling out the argument to it
 374                  * would overwrite memory we've just freed.
 375                  */
 376                 talloc_free(s->parent);
 377                 s = NULL;
 378
 379                 status = reinit_after_fork(smbd_messaging_context(),
 380                                            smbd_event_context(), true);
 381                 if (!NT_STATUS_IS_OK(status)) {
 382                         if (NT_STATUS_EQUAL(status,
 383                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
 384                                 DEBUG(0,("child process cannot initialize "
 385                                          "because too many files are open\n"));
 386                                 goto exit;
 387                         }
 388                         DEBUG(0,("reinit_after_fork() failed\n"));
 389                         smb_panic("reinit_after_fork() failed");
 390                 }
 391
 392                 smbd_setup_sig_term_handler();
 393                 smbd_setup_sig_hup_handler();
 394
 395                 smbd_process();
 396          exit:
 397                 exit_server_cleanly("end of child");
 398                 return;
 399         } else if (pid < 0) {
 400                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
 401                          strerror(errno)));
 402         }
 403
 404         /* The parent doesn't need this socket */
 405         close(smbd_server_fd());
 406
 407         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 408                 Clear the closed fd info out of server_fd --
 409                 and more importantly, out of client_fd in
 410                 util_sock.c, to avoid a possible
 411                 getpeername failure if we reopen the logs
 412                 and use %I in the filename.
 413         */
 414
 415         smbd_set_server_fd(-1);
 416
 417         if (pid != 0) {
 418                 add_child_pid(pid);
 419         }
 420
 421         /* Force parent to check log size after
 422          * spawning child.  Fix from
 423          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 424          * parent smbd will log to logserver.smb.  It
 425          * writes only two messages for each child
 426          * started/finished. But each child writes,
 427          * say, 50 messages also in logserver.smb,
 428          * begining with the debug_count of the
 429          * parent, before the child opens its own log
 430          * file logserver.client. In a worst case
 431          * scenario the size of logserver.smb would be
 432          * checked after about 50*50=2500 messages
 433          * (ca. 100kb).
 434          * */
 435         force_check_log_size();
 436 }
 437
 438 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
 439                                  const struct sockaddr_storage *ifss,
 440                                  uint16_t port)
 441 {
 442         struct smbd_open_socket *s;
 443
 444         s = talloc(parent, struct smbd_open_socket);
 445         if (!s) {
 446                 return false;
 447         }
 448
 449         s->parent = parent;
 450         s->fd = open_socket_in(SOCK_STREAM,
 451                                port,
 452                                parent->sockets == NULL ? 0 : 2,
 453                                ifss,
 454                                true);
 455         if (s->fd == -1) {
 456                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
 457                         "%s\n", strerror(errno)));
 458                 TALLOC_FREE(s);
 459                 /*
 460                  * We ignore an error here, as we've done before
 461                  */
 462                 return true;
 463         }
 464
 465         /* ready to listen */
 466         set_socket_options(s->fd, "SO_KEEPALIVE");
 467         set_socket_options(s->fd, lp_socket_options());
 468
 469         /* Set server socket to
 470          * non-blocking for the accept. */
 471         set_blocking(s->fd, False);
 472
 473         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
 474                 DEBUG(0,("open_sockets_smbd: listen: "
 475                         "%s\n", strerror(errno)));
 476                         close(s->fd);
 477                 TALLOC_FREE(s);
 478                 return false;
 479         }
 480
 481         s->fde = tevent_add_fd(smbd_event_context(),
 482                                s,
 483                                s->fd, TEVENT_FD_READ,
 484                                smbd_accept_connection,
 485                                s);
 486         if (!s->fde) {
 487                 DEBUG(0,("open_sockets_smbd: "
 488                          "tevent_add_fd: %s\n",
 489                          strerror(errno)));
 490                 close(s->fd);
 491                 TALLOC_FREE(s);
 492                 return false;
 493         }
 494         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
 495
 496         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
 497
 498         return true;
 499 }
 500
 501 /****************************************************************************
 502  Open the socket communication.
 503 ****************************************************************************/
 504
 505 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 506                               const char *smb_ports)
 507 {
 508         int num_interfaces = iface_count();
 509         int i;
 510         char *ports;
 511         unsigned dns_port = 0;
 512
 513 #ifdef HAVE_ATEXIT
 514         atexit(killkids);
 515 #endif
 516
 517         /* Stop zombies */
 518         smbd_setup_sig_chld_handler();
 519
 520         /* use a reasonable default set of ports - listing on 445 and 139 */
 521         if (!smb_ports) {
 522                 ports = lp_smb_ports();
 523                 if (!ports || !*ports) {
 524                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 525                 } else {
 526                         ports = talloc_strdup(talloc_tos(), ports);
 527                 }
 528         } else {
 529                 ports = talloc_strdup(talloc_tos(), smb_ports);
 530         }
 531
 532         if (lp_interfaces() && lp_bind_interfaces_only()) {
 533                 /* We have been given an interfaces line, and been
 534                    told to only bind to those interfaces. Create a
 535                    socket per interface and bind to only these.
 536                 */
 537
 538                 /* Now open a listen socket for each of the
 539                    interfaces. */
 540                 for(i = 0; i < num_interfaces; i++) {
 541                         const struct sockaddr_storage *ifss =
 542                                         iface_n_sockaddr_storage(i);
 543                         char *tok;
 544                         const char *ptr;
 545
 546                         if (ifss == NULL) {
 547                                 DEBUG(0,("open_sockets_smbd: "
 548                                         "interface %d has NULL IP address !\n",
 549                                         i));
 550                                 continue;
 551                         }
 552
 553                         for (ptr=ports;
 554                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 555                                 unsigned port = atoi(tok);
 556                                 if (port == 0 || port > 0xffff) {
 557                                         continue;
 558                                 }
 559
 560                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 561                                         return false;
 562                                 }
 563                         }
 564                 }
 565         } else {
 566                 /* Just bind to 0.0.0.0 - accept connections
 567                    from anywhere. */
 568
 569                 char *tok;
 570                 const char *ptr;
 571                 const char *sock_addr = lp_socket_address();
 572                 char *sock_tok;
 573                 const char *sock_ptr;
 574
 575                 if (strequal(sock_addr, "0.0.0.0") ||
 576                     strequal(sock_addr, "::")) {
 577 #if HAVE_IPV6
 578                         sock_addr = "::,0.0.0.0";
 579 #else
 580                         sock_addr = "0.0.0.0";
 581 #endif
 582                 }
 583
 584                 for (sock_ptr=sock_addr;
 585                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 586                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 587                                 struct sockaddr_storage ss;
 588
 589                                 unsigned port = atoi(tok);
 590                                 if (port == 0 || port > 0xffff) {
 591                                         continue;
 592                                 }
 593
 594                                 /* Keep the first port for mDNS service
 595                                  * registration.
 596                                  */
 597                                 if (dns_port == 0) {
 598                                         dns_port = port;
 599                                 }
 600
 601                                 /* open an incoming socket */
 602                                 if (!interpret_string_addr(&ss, sock_tok,
 603                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 604                                         continue;
 605                                 }
 606
 607                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 608                                         return false;
 609                                 }
 610                         }
 611                 }
 612         }
 613
 614         if (parent->sockets == NULL) {
 615                 DEBUG(0,("open_sockets_smbd: No "
 616                         "sockets available to bind to.\n"));
 617                 return false;
 618         }
 619
 620         /* Setup the main smbd so that we can get messages. Note that
 621            do this after starting listening. This is needed as when in
 622            clustered mode, ctdb won't allow us to start doing database
 623            operations until it has gone thru a full startup, which
 624            includes checking to see that smbd is listening. */
 625         claim_connection(NULL,"",
 626                          FLAG_MSG_GENERAL|FLAG_MSG_SMBD|FLAG_MSG_DBWRAP);
 627
 628         /* Listen to messages */
 629
 630         messaging_register(smbd_messaging_context(), NULL,
 631                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 632         messaging_register(smbd_messaging_context(), NULL,
 633                            MSG_SHUTDOWN, msg_exit_server);
 634         messaging_register(smbd_messaging_context(), NULL,
 635                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 636         messaging_register(smbd_messaging_context(), NULL,
 637                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 638         messaging_register(smbd_messaging_context(), NULL,
 639                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 640         brl_register_msgs(smbd_messaging_context());
 641
 642 #ifdef CLUSTER_SUPPORT
 643         if (lp_clustering()) {
 644                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 645         }
 646 #endif
 647
 648 #ifdef DEVELOPER
 649         messaging_register(smbd_messaging_context(), NULL,
 650                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 651 #endif
 652
 653         if (dns_port != 0) {
 654 #ifdef WITH_DNSSD_SUPPORT
 655                 smbd_setup_mdns_registration(smbd_event_context(),
 656                                              parent, dns_port);
 657 #endif
 658 #ifdef WITH_AVAHI_SUPPORT
 659                 void *avahi_conn;
 660
 661                 avahi_conn = avahi_start_register(
 662                         smbd_event_context(), smbd_event_context(), dns_port);
 663                 if (avahi_conn == NULL) {
 664                         DEBUG(10, ("avahi_start_register failed\n"));
 665                 }
 666 #endif
 667         }
 668
 669         return true;
 670 }
 671
 672 static void smbd_parent_loop(struct smbd_parent_context *parent)
 673 {
 674         /* now accept incoming connections - forking a new process
 675            for each incoming connection */
 676         DEBUG(2,("waiting for connections\n"));
 677         while (1) {
 678                 int ret;
 679                 TALLOC_CTX *frame = talloc_stackframe();
 680
 681                 ret = tevent_loop_once(smbd_event_context());
 682                 if (ret != 0) {
 683                         exit_server_cleanly("tevent_loop_once() error");
 684                 }
 685
 686                 TALLOC_FREE(frame);
 687         } /* end while 1 */
 688
 689 /* NOTREACHED   return True; */
 690 }
 691
 692 /***************************************************************************
 693  purge stale printers and reload from pre-populated pcap cache
 694 ***************************************************************************/
 695 void reload_printers(void)
 696 {
 697         int snum;
 698         int n_services = lp_numservices();
 699         int pnum = lp_servicenumber(PRINTERS_NAME);
 700         const char *pname;
 701
 702         SMB_ASSERT(pcap_cache_loaded());
 703
 704         DEBUG(10, ("reloading printer services from pcap cache\n"));
 705         for (snum = 0; snum < n_services; snum++) {
 706                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 707                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 708                                       lp_autoloaded(snum)))
 709                         continue;
 710
 711                 pname = lp_printername(snum);
 712                 if (!pcap_printername_ok(pname)) {
 713                         DEBUG(3, ("removing stale printer %s\n", pname));
 714
 715                         if (is_printer_published(NULL, snum, NULL))
 716                                 nt_printer_publish(NULL, snum, DSPRINT_UNPUBLISH);
 717                         del_a_printer(pname);
 718                         lp_killservice(snum);
 719                 }
 720         }
 721
 722         load_printers();
 723 }
 724
 725 /****************************************************************************
 726  Reload the services file.
 727 **************************************************************************/
 728
 729 bool reload_services(bool test)
 730 {
 731         bool ret;
 732
 733         if (lp_loaded()) {
 734                 char *fname = lp_configfile();
 735                 if (file_exist(fname) &&
 736                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 737                         set_dyn_CONFIGFILE(fname);
 738                         test = False;
 739                 }
 740         }
 741
 742         reopen_logs();
 743
 744         if (test && !lp_file_list_changed())
 745                 return(True);
 746
 747         lp_killunused(conn_snum_used);
 748
 749         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 750
 751         pcap_cache_reload(&reload_printers);
 752
 753         /* perhaps the config filename is now set */
 754         if (!test)
 755                 reload_services(True);
 756
 757         reopen_logs();
 758
 759         load_interfaces();
 760
 761         if (smbd_server_fd() != -1) {
 762                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 763                 set_socket_options(smbd_server_fd(), lp_socket_options());
 764         }
 765
 766         mangle_reset_cache();
 767         reset_stat_cache();
 768
 769         /* this forces service parameters to be flushed */
 770         set_current_service(NULL,0,True);
 771
 772         return(ret);
 773 }
 774
 775 /****************************************************************************
 776  Exit the server.
 777 ****************************************************************************/
 778
 779 /* Reasons for shutting down a server process. */
 780 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 781
 782 static void exit_server_common(enum server_exit_reason how,
 783         const char *const reason) _NORETURN_;
 784
 785 static void exit_server_common(enum server_exit_reason how,
 786         const char *const reason)
 787 {
 788         bool had_open_conn;
 789
 790         if (!exit_firsttime)
 791                 exit(0);
 792         exit_firsttime = false;
 793
 794         change_to_root_user();
 795
 796         if (negprot_global_auth_context) {
 797                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 798         }
 799
 800         had_open_conn = conn_close_all();
 801
 802         invalidate_all_vuids();
 803
 804         /* 3 second timeout. */
 805         print_notify_send_messages(smbd_messaging_context(), 3);
 806
 807         /* delete our entry in the connections database. */
 808         yield_connection(NULL,"");
 809
 810 #ifdef WITH_DFS
 811         if (dcelogin_atmost_once) {
 812                 dfs_unlogin();
 813         }
 814 #endif
 815
 816 #ifdef USE_DMAPI
 817         /* Destroy Samba DMAPI session only if we are master smbd process */
 818         if (am_parent) {
 819                 if (!dmapi_destroy_session()) {
 820                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 821                 }
 822         }
 823 #endif
 824
 825         locking_end();
 826         printing_end();
 827
 828         if (how != SERVER_EXIT_NORMAL) {
 829                 int oldlevel = DEBUGLEVEL;
 830
 831                 DEBUGLEVEL = 10;
 832
 833                 DEBUGSEP(0);
 834                 DEBUG(0,("Abnormal server exit: %s\n",
 835                         reason ? reason : "no explanation provided"));
 836                 DEBUGSEP(0);
 837
 838                 log_stack_trace();
 839
 840                 DEBUGLEVEL = oldlevel;
 841                 dump_core();
 842
 843         } else {
 844                 DEBUG(3,("Server exit (%s)\n",
 845                         (reason ? reason : "normal exit")));
 846                 if (am_parent) {
 847                         pidfile_unlink();
 848                 }
 849         }
 850
 851         /* if we had any open SMB connections when we exited then we
 852            need to tell the parent smbd so that it can trigger a retry
 853            of any locks we may have been holding or open files we were
 854            blocking */
 855         if (had_open_conn) {
 856                 exit(1);
 857         } else {
 858                 exit(0);
 859         }
 860 }
 861
 862 void exit_server(const char *const explanation)
 863 {
 864         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 865 }
 866
 867 void exit_server_cleanly(const char *const explanation)
 868 {
 869         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 870 }
 871
 872 void exit_server_fault(void)
 873 {
 874         exit_server("critical server fault");
 875 }
 876
 877 /****************************************************************************
 878  Initialise connect, service and file structs.
 879 ****************************************************************************/
 880
 881 static bool init_structs(void )
 882 {
 883         /*
 884          * Set the machine NETBIOS name if not already
 885          * set from the config file.
 886          */
 887
 888         if (!init_names())
 889                 return False;
 890
 891         conn_init();
 892
 893         file_init();
 894
 895         init_dptrs();
 896
 897         if (!secrets_init())
 898                 return False;
 899
 900         return True;
 901 }
 902
 903 /****************************************************************************
 904  main program.
 905 ****************************************************************************/
 906
 907 /* Declare prototype for build_options() to avoid having to run it through
 908    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 909    prototype generation system is too complicated. */
 910
 911 extern void build_options(bool screen);
 912
 913  int main(int argc,const char *argv[])
 914 {
 915         /* shall I run as a daemon */
 916         bool is_daemon = false;
 917         bool interactive = false;
 918         bool Fork = true;
 919         bool no_process_group = false;
 920         bool log_stdout = false;
 921         char *ports = NULL;
 922         char *profile_level = NULL;
 923         int opt;
 924         poptContext pc;
 925         bool print_build_options = False;
 926         enum {
 927                 OPT_DAEMON = 1000,
 928                 OPT_INTERACTIVE,
 929                 OPT_FORK,
 930                 OPT_NO_PROCESS_GROUP,
 931                 OPT_LOG_STDOUT
 932         };
 933         struct poptOption long_options[] = {
 934         POPT_AUTOHELP
 935         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 936         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 937         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 938         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 939         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 940         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 941         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 942         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 943         POPT_COMMON_SAMBA
 944         POPT_COMMON_DYNCONFIG
 945         POPT_TABLEEND
 946         };
 947         struct smbd_parent_context *parent = NULL;
 948         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
 949
 950         smbd_init_globals();
 951
 952         TimeInit();
 953
 954 #ifdef HAVE_SET_AUTH_PARAMETERS
 955         set_auth_parameters(argc,argv);
 956 #endif
 957
 958         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 959         while((opt = poptGetNextOpt(pc)) != -1) {
 960                 switch (opt)  {
 961                 case OPT_DAEMON:
 962                         is_daemon = true;
 963                         break;
 964                 case OPT_INTERACTIVE:
 965                         interactive = true;
 966                         break;
 967                 case OPT_FORK:
 968                         Fork = false;
 969                         break;
 970                 case OPT_NO_PROCESS_GROUP:
 971                         no_process_group = true;
 972                         break;
 973                 case OPT_LOG_STDOUT:
 974                         log_stdout = true;
 975                         break;
 976                 case 'b':
 977                         print_build_options = True;
 978                         break;
 979                 default:
 980                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 981                                   poptBadOption(pc, 0), poptStrerror(opt));
 982                         poptPrintUsage(pc, stderr, 0);
 983                         exit(1);
 984                 }
 985         }
 986         poptFreeContext(pc);
 987
 988         if (interactive) {
 989                 Fork = False;
 990                 log_stdout = True;
 991         }
 992
 993         setup_logging(argv[0],log_stdout);
 994
 995         if (print_build_options) {
 996                 build_options(True); /* Display output to screen as well as debug */
 997                 exit(0);
 998         }
 999
1000         load_case_tables();
1001
1002 #ifdef HAVE_SETLUID
1003         /* needed for SecureWare on SCO */
1004         setluid(0);
1005 #endif
1006
1007         sec_init();
1008
1009         set_remote_machine_name("smbd", False);
1010
1011         if (interactive && (DEBUGLEVEL >= 9)) {
1012                 talloc_enable_leak_report();
1013         }
1014
1015         if (log_stdout && Fork) {
1016                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1017                 exit(1);
1018         }
1019
1020         /* we want to re-seed early to prevent time delays causing
1021            client problems at a later date. (tridge) */
1022         generate_random_buffer(NULL, 0);
1023
1024         /* make absolutely sure we run as root - to handle cases where people
1025            are crazy enough to have it setuid */
1026
1027         gain_root_privilege();
1028         gain_root_group_privilege();
1029
1030         fault_setup((void (*)(void *))exit_server_fault);
1031         dump_core_setup("smbd");
1032
1033         /* we are never interested in SIGPIPE */
1034         BlockSignals(True,SIGPIPE);
1035
1036 #if defined(SIGFPE)
1037         /* we are never interested in SIGFPE */
1038         BlockSignals(True,SIGFPE);
1039 #endif
1040
1041 #if defined(SIGUSR2)
1042         /* We are no longer interested in USR2 */
1043         BlockSignals(True,SIGUSR2);
1044 #endif
1045
1046         /* POSIX demands that signals are inherited. If the invoking process has
1047          * these signals masked, we will have problems, as we won't recieve them. */
1048         BlockSignals(False, SIGHUP);
1049         BlockSignals(False, SIGUSR1);
1050         BlockSignals(False, SIGTERM);
1051
1052         /* Ensure we leave no zombies until we
1053          * correctly set up child handling below. */
1054
1055         CatchChild();
1056
1057         /* we want total control over the permissions on created files,
1058            so set our umask to 0 */
1059         umask(0);
1060
1061         init_sec_ctx();
1062
1063         reopen_logs();
1064
1065         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1066         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1067
1068         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1069                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1070
1071         /* Output the build options to the debug log */
1072         build_options(False);
1073
1074         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1075                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1076                 exit(1);
1077         }
1078
1079         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1080                 DEBUG(0, ("error opening config file\n"));
1081                 exit(1);
1082         }
1083
1084         if (smbd_messaging_context() == NULL)
1085                 exit(1);
1086
1087         if (!reload_services(False))
1088                 return(-1);
1089
1090         init_structs();
1091
1092 #ifdef WITH_PROFILE
1093         if (!profile_setup(smbd_messaging_context(), False)) {
1094                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1095                 return -1;
1096         }
1097         if (profile_level != NULL) {
1098                 int pl = atoi(profile_level);
1099                 struct server_id src;
1100
1101                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1102                 src.pid = getpid();
1103                 set_profile_level(pl, src);
1104         }
1105 #endif
1106
1107         DEBUG(3,( "loaded services\n"));
1108
1109         if (!is_daemon && !is_a_socket(0)) {
1110                 if (!interactive)
1111                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1112
1113                 /*
1114                  * Setting is_daemon here prevents us from eventually calling
1115                  * the open_sockets_inetd()
1116                  */
1117
1118                 is_daemon = True;
1119         }
1120
1121         if (is_daemon && !interactive) {
1122                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1123                 become_daemon(Fork, no_process_group);
1124         }
1125
1126 #if HAVE_SETPGID
1127         /*
1128          * If we're interactive we want to set our own process group for
1129          * signal management.
1130          */
1131         if (interactive && !no_process_group)
1132                 setpgid( (pid_t)0, (pid_t)0);
1133 #endif
1134
1135         if (!directory_exist(lp_lockdir()))
1136                 mkdir(lp_lockdir(), 0755);
1137
1138         if (is_daemon)
1139                 pidfile_create("smbd");
1140
1141         if (!NT_STATUS_IS_OK(reinit_after_fork(smbd_messaging_context(),
1142                              smbd_event_context(), false))) {
1143                 DEBUG(0,("reinit_after_fork() failed\n"));
1144                 exit(1);
1145         }
1146
1147         smbd_setup_sig_term_handler();
1148         smbd_setup_sig_hup_handler();
1149
1150         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1151
1152         if (smbd_memcache() == NULL) {
1153                 exit(1);
1154         }
1155
1156         memcache_set_global(smbd_memcache());
1157
1158         /* Initialise the password backed before the global_sam_sid
1159            to ensure that we fetch from ldap before we make a domain sid up */
1160
1161         if(!initialize_password_db(False, smbd_event_context()))
1162                 exit(1);
1163
1164         if (!secrets_init()) {
1165                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1166                 exit(1);
1167         }
1168
1169         if(!get_global_sam_sid()) {
1170                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1171                 exit(1);
1172         }
1173
1174         if (!session_init())
1175                 exit(1);
1176
1177         if (!connections_init(True))
1178                 exit(1);
1179
1180         if (!locking_init())
1181                 exit(1);
1182
1183         namecache_enable();
1184
1185         if (!W_ERROR_IS_OK(registry_init_full()))
1186                 exit(1);
1187
1188 #if 0
1189         if (!init_svcctl_db())
1190                 exit(1);
1191 #endif
1192
1193         if (!print_backend_init(smbd_messaging_context()))
1194                 exit(1);
1195
1196         if (!init_guest_info()) {
1197                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1198                 return -1;
1199         }
1200
1201         /* only start the background queue daemon if we are
1202            running as a daemon -- bad things will happen if
1203            smbd is launched via inetd and we fork a copy of
1204            ourselves here */
1205
1206         if (is_daemon && !interactive
1207             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1208                 start_background_queue();
1209         }
1210
1211         if (!is_daemon) {
1212                 /* inetd mode */
1213                 TALLOC_FREE(frame);
1214
1215                 /* Started from inetd. fd 0 is the socket. */
1216                 /* We will abort gracefully when the client or remote system
1217                    goes away */
1218                 smbd_set_server_fd(dup(0));
1219
1220                 /* close our standard file descriptors */
1221                 close_low_fds(False); /* Don't close stderr */
1222
1223 #ifdef HAVE_ATEXIT
1224                 atexit(killkids);
1225 #endif
1226
1227                 /* Stop zombies */
1228                 smbd_setup_sig_chld_handler();
1229
1230                 smbd_process();
1231
1232                 exit_server_cleanly(NULL);
1233                 return(0);
1234         }
1235
1236         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1237         if (!parent) {
1238                 exit_server("talloc(struct smbd_parent_context) failed");
1239         }
1240         parent->interactive = interactive;
1241
1242         if (!open_sockets_smbd(parent, ports))
1243                 exit_server("open_sockets_smbd() failed");
1244
1245         TALLOC_FREE(frame);
1246
1247         smbd_parent_loop(parent);
1248
1249         exit_server_cleanly(NULL);
1250         return(0);
1251 }