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 struct event_context *smbd_event_context(void)
  63 {
  64         static struct event_context *ctx;
  65
  66         if (!ctx && !(ctx = event_context_init(NULL))) {
  67                 smb_panic("Could not init smbd event context");
  68         }
  69         return ctx;
  70 }
  71
  72 struct messaging_context *smbd_messaging_context(void)
  73 {
  74         static struct messaging_context *ctx;
  75
  76         if (!ctx && !(ctx = messaging_init(NULL, server_id_self(),
  77                                            smbd_event_context()))) {
  78                 smb_panic("Could not init smbd messaging context");
  79         }
  80         return ctx;
  81 }
  82
  83 struct memcache *smbd_memcache(void)
  84 {
  85         static struct memcache *cache;
  86
  87         if (!cache
  88             && !(cache = memcache_init(NULL,
  89                                        lp_max_stat_cache_size()*1024))) {
  90
  91                 smb_panic("Could not init smbd memcache");
  92         }
  93         return cache;
  94 }
  95
  96 /*******************************************************************
  97  What to do when smb.conf is updated.
  98  ********************************************************************/
  99
 100 static void smb_conf_updated(struct messaging_context *msg,
 101                              void *private_data,
 102                              uint32_t msg_type,
 103                              struct server_id server_id,
 104                              DATA_BLOB *data)
 105 {
 106         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
 107                   "updated. Reloading.\n"));
 108         reload_services(False);
 109 }
 110
 111
 112 /*******************************************************************
 113  Delete a statcache entry.
 114  ********************************************************************/
 115
 116 static void smb_stat_cache_delete(struct messaging_context *msg,
 117                                   void *private_data,
 118                                   uint32_t msg_tnype,
 119                                   struct server_id server_id,
 120                                   DATA_BLOB *data)
 121 {
 122         const char *name = (const char *)data->data;
 123         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 124         stat_cache_delete(name);
 125 }
 126
 127 /****************************************************************************
 128  Terminate signal.
 129 ****************************************************************************/
 130
 131 static void sig_term(void)
 132 {
 133         got_sig_term = 1;
 134         sys_select_signal(SIGTERM);
 135 }
 136
 137 /****************************************************************************
 138  Catch a sighup.
 139 ****************************************************************************/
 140
 141 static void sig_hup(int sig)
 142 {
 143         reload_after_sighup = 1;
 144         sys_select_signal(SIGHUP);
 145 }
 146
 147 /****************************************************************************
 148  Catch a sigcld
 149 ****************************************************************************/
 150 static void sig_cld(int sig)
 151 {
 152         got_sig_cld = 1;
 153         sys_select_signal(SIGCLD);
 154 }
 155
 156 /****************************************************************************
 157   Send a SIGTERM to our process group.
 158 *****************************************************************************/
 159
 160 static void  killkids(void)
 161 {
 162         if(am_parent) kill(0,SIGTERM);
 163 }
 164
 165 /****************************************************************************
 166  Process a sam sync message - not sure whether to do this here or
 167  somewhere else.
 168 ****************************************************************************/
 169
 170 static void msg_sam_sync(struct messaging_context *msg,
 171                          void *private_data,
 172                          uint32_t msg_type,
 173                          struct server_id server_id,
 174                          DATA_BLOB *data)
 175 {
 176         DEBUG(10, ("** sam sync message received, ignoring\n"));
 177 }
 178
 179
 180 /****************************************************************************
 181  Open the socket communication - inetd.
 182 ****************************************************************************/
 183
 184 static bool open_sockets_inetd(void)
 185 {
 186         /* Started from inetd. fd 0 is the socket. */
 187         /* We will abort gracefully when the client or remote system
 188            goes away */
 189         smbd_set_server_fd(dup(0));
 190
 191         /* close our standard file descriptors */
 192         close_low_fds(False); /* Don't close stderr */
 193
 194         set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 195         set_socket_options(smbd_server_fd(), lp_socket_options());
 196
 197         return True;
 198 }
 199
 200 static void msg_exit_server(struct messaging_context *msg,
 201                             void *private_data,
 202                             uint32_t msg_type,
 203                             struct server_id server_id,
 204                             DATA_BLOB *data)
 205 {
 206         DEBUG(3, ("got a SHUTDOWN message\n"));
 207         exit_server_cleanly(NULL);
 208 }
 209
 210 #ifdef DEVELOPER
 211 static void msg_inject_fault(struct messaging_context *msg,
 212                              void *private_data,
 213                              uint32_t msg_type,
 214                              struct server_id src,
 215                              DATA_BLOB *data)
 216 {
 217         int sig;
 218
 219         if (data->length != sizeof(sig)) {
 220
 221                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 222                           procid_str_static(&src)));
 223                 return;
 224         }
 225
 226         sig = *(int *)data->data;
 227         if (sig == -1) {
 228                 exit_server("internal error injected");
 229                 return;
 230         }
 231
 232 #if HAVE_STRSIGNAL
 233         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 234                   procid_str_static(&src), sig, strsignal(sig)));
 235 #else
 236         DEBUG(0, ("Process %s requested injection of signal %d\n",
 237                   procid_str_static(&src), sig));
 238 #endif
 239
 240         kill(sys_getpid(), sig);
 241 }
 242 #endif /* DEVELOPER */
 243
 244 struct child_pid {
 245         struct child_pid *prev, *next;
 246         pid_t pid;
 247 };
 248
 249 static struct child_pid *children;
 250 static int num_children;
 251
 252 static void add_child_pid(pid_t pid)
 253 {
 254         struct child_pid *child;
 255
 256         if (lp_max_smbd_processes() == 0) {
 257                 /* Don't bother with the child list if we don't care anyway */
 258                 return;
 259         }
 260
 261         child = SMB_MALLOC_P(struct child_pid);
 262         if (child == NULL) {
 263                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 264                 return;
 265         }
 266         child->pid = pid;
 267         DLIST_ADD(children, child);
 268         num_children += 1;
 269 }
 270
 271 static void remove_child_pid(pid_t pid)
 272 {
 273         struct child_pid *child;
 274
 275         if (lp_max_smbd_processes() == 0) {
 276                 /* Don't bother with the child list if we don't care anyway */
 277                 return;
 278         }
 279
 280         for (child = children; child != NULL; child = child->next) {
 281                 if (child->pid == pid) {
 282                         struct child_pid *tmp = child;
 283                         DLIST_REMOVE(children, child);
 284                         SAFE_FREE(tmp);
 285                         num_children -= 1;
 286                         return;
 287                 }
 288         }
 289
 290         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 291 }
 292
 293 /****************************************************************************
 294  Have we reached the process limit ?
 295 ****************************************************************************/
 296
 297 static bool allowable_number_of_smbd_processes(void)
 298 {
 299         int max_processes = lp_max_smbd_processes();
 300
 301         if (!max_processes)
 302                 return True;
 303
 304         return num_children < max_processes;
 305 }
 306
 307 /****************************************************************************
 308  Open the socket communication.
 309 ****************************************************************************/
 310
 311 static bool open_sockets_smbd(bool is_daemon, bool interactive, const char *smb_ports)
 312 {
 313         int num_interfaces = iface_count();
 314         int num_sockets = 0;
 315         int fd_listenset[FD_SETSIZE];
 316         fd_set listen_set;
 317         int s;
 318         int maxfd = 0;
 319         int i;
 320         char *ports;
 321         struct dns_reg_state * dns_reg = NULL;
 322         unsigned dns_port = 0;
 323
 324         if (!is_daemon) {
 325                 return open_sockets_inetd();
 326         }
 327
 328 #ifdef HAVE_ATEXIT
 329         {
 330                 static int atexit_set;
 331                 if(atexit_set == 0) {
 332                         atexit_set=1;
 333                         atexit(killkids);
 334                 }
 335         }
 336 #endif
 337
 338         /* Stop zombies */
 339         CatchSignal(SIGCLD, sig_cld);
 340
 341         FD_ZERO(&listen_set);
 342
 343         /* use a reasonable default set of ports - listing on 445 and 139 */
 344         if (!smb_ports) {
 345                 ports = lp_smb_ports();
 346                 if (!ports || !*ports) {
 347                         ports = smb_xstrdup(SMB_PORTS);
 348                 } else {
 349                         ports = smb_xstrdup(ports);
 350                 }
 351         } else {
 352                 ports = smb_xstrdup(smb_ports);
 353         }
 354
 355         if (lp_interfaces() && lp_bind_interfaces_only()) {
 356                 /* We have been given an interfaces line, and been
 357                    told to only bind to those interfaces. Create a
 358                    socket per interface and bind to only these.
 359                 */
 360
 361                 /* Now open a listen socket for each of the
 362                    interfaces. */
 363                 for(i = 0; i < num_interfaces; i++) {
 364                         TALLOC_CTX *frame = NULL;
 365                         const struct sockaddr_storage *ifss =
 366                                         iface_n_sockaddr_storage(i);
 367                         char *tok;
 368                         const char *ptr;
 369
 370                         if (ifss == NULL) {
 371                                 DEBUG(0,("open_sockets_smbd: "
 372                                         "interface %d has NULL IP address !\n",
 373                                         i));
 374                                 continue;
 375                         }
 376
 377                         frame = talloc_stackframe();
 378                         for (ptr=ports;
 379                                         next_token_talloc(frame,&ptr, &tok, " \t,");) {
 380                                 unsigned port = atoi(tok);
 381                                 if (port == 0 || port > 0xffff) {
 382                                         continue;
 383                                 }
 384
 385                                 /* Keep the first port for mDNS service
 386                                  * registration.
 387                                  */
 388                                 if (dns_port == 0) {
 389                                         dns_port = port;
 390                                 }
 391
 392                                 s = fd_listenset[num_sockets] =
 393                                         open_socket_in(SOCK_STREAM,
 394                                                         port,
 395                                                         num_sockets == 0 ? 0 : 2,
 396                                                         ifss,
 397                                                         true);
 398                                 if(s == -1) {
 399                                         continue;
 400                                 }
 401
 402                                 /* ready to listen */
 403                                 set_socket_options(s,"SO_KEEPALIVE");
 404                                 set_socket_options(s,lp_socket_options());
 405
 406                                 /* Set server socket to
 407                                  * non-blocking for the accept. */
 408                                 set_blocking(s,False);
 409
 410                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 411                                         DEBUG(0,("open_sockets_smbd: listen: "
 412                                                 "%s\n", strerror(errno)));
 413                                         close(s);
 414                                         TALLOC_FREE(frame);
 415                                         return False;
 416                                 }
 417                                 FD_SET(s,&listen_set);
 418                                 maxfd = MAX( maxfd, s);
 419
 420                                 num_sockets++;
 421                                 if (num_sockets >= FD_SETSIZE) {
 422                                         DEBUG(0,("open_sockets_smbd: Too "
 423                                                 "many sockets to bind to\n"));
 424                                         TALLOC_FREE(frame);
 425                                         return False;
 426                                 }
 427                         }
 428                         TALLOC_FREE(frame);
 429                 }
 430         } else {
 431                 /* Just bind to 0.0.0.0 - accept connections
 432                    from anywhere. */
 433
 434                 TALLOC_CTX *frame = talloc_stackframe();
 435                 char *tok;
 436                 const char *ptr;
 437                 const char *sock_addr = lp_socket_address();
 438                 char *sock_tok;
 439                 const char *sock_ptr;
 440
 441                 if (strequal(sock_addr, "0.0.0.0") ||
 442                                 strequal(sock_addr, "::")) {
 443 #if HAVE_IPV6
 444                         sock_addr = "::,0.0.0.0";
 445 #else
 446                         sock_addr = "0.0.0.0";
 447 #endif
 448                 }
 449
 450                 for (sock_ptr=sock_addr;
 451                                 next_token_talloc(frame, &sock_ptr, &sock_tok, " \t,"); ) {
 452                         for (ptr=ports; next_token_talloc(frame, &ptr, &tok, " \t,"); ) {
 453                                 struct sockaddr_storage ss;
 454
 455                                 unsigned port = atoi(tok);
 456                                 if (port == 0 || port > 0xffff) {
 457                                         continue;
 458                                 }
 459
 460                                 /* Keep the first port for mDNS service
 461                                  * registration.
 462                                  */
 463                                 if (dns_port == 0) {
 464                                         dns_port = port;
 465                                 }
 466
 467                                 /* open an incoming socket */
 468                                 if (!interpret_string_addr(&ss, sock_tok,
 469                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 470                                         continue;
 471                                 }
 472
 473                                 s = open_socket_in(SOCK_STREAM,
 474                                                 port,
 475                                                 num_sockets == 0 ? 0 : 2,
 476                                                 &ss,
 477                                                 true);
 478                                 if (s == -1) {
 479                                         continue;
 480                                 }
 481
 482                                 /* ready to listen */
 483                                 set_socket_options(s,"SO_KEEPALIVE");
 484                                 set_socket_options(s,lp_socket_options());
 485
 486                                 /* Set server socket to non-blocking
 487                                  * for the accept. */
 488                                 set_blocking(s,False);
 489
 490                                 if (listen(s, SMBD_LISTEN_BACKLOG) == -1) {
 491                                         DEBUG(0,("open_sockets_smbd: "
 492                                                 "listen: %s\n",
 493                                                  strerror(errno)));
 494                                         close(s);
 495                                         TALLOC_FREE(frame);
 496                                         return False;
 497                                 }
 498
 499                                 fd_listenset[num_sockets] = s;
 500                                 FD_SET(s,&listen_set);
 501                                 maxfd = MAX( maxfd, s);
 502
 503                                 num_sockets++;
 504
 505                                 if (num_sockets >= FD_SETSIZE) {
 506                                         DEBUG(0,("open_sockets_smbd: Too "
 507                                                 "many sockets to bind to\n"));
 508                                         TALLOC_FREE(frame);
 509                                         return False;
 510                                 }
 511                         }
 512                 }
 513                 TALLOC_FREE(frame);
 514         }
 515
 516         SAFE_FREE(ports);
 517
 518         if (num_sockets == 0) {
 519                 DEBUG(0,("open_sockets_smbd: No "
 520                         "sockets available to bind to.\n"));
 521                 return false;
 522         }
 523
 524         /* Setup the main smbd so that we can get messages. Note that
 525            do this after starting listening. This is needed as when in
 526            clustered mode, ctdb won't allow us to start doing database
 527            operations until it has gone thru a full startup, which
 528            includes checking to see that smbd is listening. */
 529         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_SMBD);
 530
 531         /* Listen to messages */
 532
 533         messaging_register(smbd_messaging_context(), NULL,
 534                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 535         messaging_register(smbd_messaging_context(), NULL,
 536                            MSG_SHUTDOWN, msg_exit_server);
 537         messaging_register(smbd_messaging_context(), NULL,
 538                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 539         messaging_register(smbd_messaging_context(), NULL,
 540                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 541         messaging_register(smbd_messaging_context(), NULL,
 542                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 543         brl_register_msgs(smbd_messaging_context());
 544
 545 #ifdef DEVELOPER
 546         messaging_register(smbd_messaging_context(), NULL,
 547                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 548 #endif
 549
 550         /* now accept incoming connections - forking a new process
 551            for each incoming connection */
 552         DEBUG(2,("waiting for a connection\n"));
 553         while (1) {
 554                 struct timeval now, idle_timeout;
 555                 fd_set r_fds, w_fds;
 556                 int num;
 557
 558                 /* Ensure we respond to PING and DEBUG messages from the main smbd. */
 559                 message_dispatch(smbd_messaging_context());
 560
 561                 if (got_sig_cld) {
 562                         pid_t pid;
 563                         got_sig_cld = False;
 564
 565                         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 566                                 remove_child_pid(pid);
 567                         }
 568                 }
 569
 570                 idle_timeout = timeval_zero();
 571
 572                 memcpy((char *)&r_fds, (char *)&listen_set,
 573                        sizeof(listen_set));
 574                 FD_ZERO(&w_fds);
 575                 GetTimeOfDay(&now);
 576
 577                 /* Kick off our mDNS registration. */
 578                 if (dns_port != 0) {
 579                         dns_register_smbd(&dns_reg, dns_port, &maxfd,
 580                                         &r_fds, &idle_timeout);
 581                 }
 582
 583                 event_add_to_select_args(smbd_event_context(), &now,
 584                                          &r_fds, &w_fds, &idle_timeout,
 585                                          &maxfd);
 586
 587                 num = sys_select(maxfd+1,&r_fds,&w_fds,NULL,
 588                                  timeval_is_zero(&idle_timeout) ?
 589                                  NULL : &idle_timeout);
 590
 591                 if (num == -1 && errno == EINTR) {
 592                         if (got_sig_term) {
 593                                 exit_server_cleanly(NULL);
 594                         }
 595
 596                         /* check for sighup processing */
 597                         if (reload_after_sighup) {
 598                                 change_to_root_user();
 599                                 DEBUG(1,("Reloading services after SIGHUP\n"));
 600                                 reload_services(False);
 601                                 reload_after_sighup = 0;
 602                         }
 603
 604                         continue;
 605                 }
 606
 607                 /* process pending nDNS responses */
 608                 if (dns_register_smbd_reply(dns_reg, &r_fds, &idle_timeout)) {
 609                         --num;
 610                 }
 611
 612                 if (run_events(smbd_event_context(), num, &r_fds, &w_fds)) {
 613                         continue;
 614                 }
 615
 616                 /* check if we need to reload services */
 617                 check_reload(time(NULL));
 618
 619                 /* Find the sockets that are read-ready -
 620                    accept on these. */
 621                 for( ; num > 0; num--) {
 622                         struct sockaddr addr;
 623                         socklen_t in_addrlen = sizeof(addr);
 624                         pid_t child = 0;
 625
 626                         s = -1;
 627                         for(i = 0; i < num_sockets; i++) {
 628                                 if(FD_ISSET(fd_listenset[i],&r_fds)) {
 629                                         s = fd_listenset[i];
 630                                         /* Clear this so we don't look
 631                                            at it again. */
 632                                         FD_CLR(fd_listenset[i],&r_fds);
 633                                         break;
 634                                 }
 635                         }
 636
 637                         smbd_set_server_fd(accept(s,&addr,&in_addrlen));
 638
 639                         if (smbd_server_fd() == -1 && errno == EINTR)
 640                                 continue;
 641
 642                         if (smbd_server_fd() == -1) {
 643                                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 644                                          strerror(errno)));
 645                                 continue;
 646                         }
 647
 648                         /* Ensure child is set to blocking mode */
 649                         set_blocking(smbd_server_fd(),True);
 650
 651                         if (smbd_server_fd() != -1 && interactive)
 652                                 return True;
 653
 654                         if (allowable_number_of_smbd_processes() &&
 655                             smbd_server_fd() != -1 &&
 656                             ((child = sys_fork())==0)) {
 657                                 char remaddr[INET6_ADDRSTRLEN];
 658
 659                                 /* Child code ... */
 660
 661                                 /* Stop zombies, the parent explicitly handles
 662                                  * them, counting worker smbds. */
 663                                 CatchChild();
 664
 665                                 /* close the listening socket(s) */
 666                                 for(i = 0; i < num_sockets; i++)
 667                                         close(fd_listenset[i]);
 668
 669                                 /* close our mDNS daemon handle */
 670                                 dns_register_close(&dns_reg);
 671
 672                                 /* close our standard file
 673                                    descriptors */
 674                                 close_low_fds(False);
 675                                 am_parent = 0;
 676
 677                                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 678                                 set_socket_options(smbd_server_fd(),
 679                                                    lp_socket_options());
 680
 681                                 /* this is needed so that we get decent entries
 682                                    in smbstatus for port 445 connects */
 683                                 set_remote_machine_name(get_peer_addr(smbd_server_fd(),
 684                                                                 remaddr,
 685                                                                 sizeof(remaddr)),
 686                                                                 false);
 687
 688                                 /* Reset the state of the random
 689                                  * number generation system, so
 690                                  * children do not get the same random
 691                                  * numbers as each other */
 692
 693                                 set_need_random_reseed();
 694                                 /* tdb needs special fork handling - remove
 695                                  * CLEAR_IF_FIRST flags */
 696                                 if (tdb_reopen_all(1) == -1) {
 697                                         DEBUG(0,("tdb_reopen_all failed.\n"));
 698                                         smb_panic("tdb_reopen_all failed");
 699                                 }
 700
 701                                 return True;
 702                         }
 703                         /* The parent doesn't need this socket */
 704                         close(smbd_server_fd());
 705
 706                         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 707                                 Clear the closed fd info out of server_fd --
 708                                 and more importantly, out of client_fd in
 709                                 util_sock.c, to avoid a possible
 710                                 getpeername failure if we reopen the logs
 711                                 and use %I in the filename.
 712                         */
 713
 714                         smbd_set_server_fd(-1);
 715
 716                         if (child != 0) {
 717                                 add_child_pid(child);
 718                         }
 719
 720                         /* Force parent to check log size after
 721                          * spawning child.  Fix from
 722                          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 723                          * parent smbd will log to logserver.smb.  It
 724                          * writes only two messages for each child
 725                          * started/finished. But each child writes,
 726                          * say, 50 messages also in logserver.smb,
 727                          * begining with the debug_count of the
 728                          * parent, before the child opens its own log
 729                          * file logserver.client. In a worst case
 730                          * scenario the size of logserver.smb would be
 731                          * checked after about 50*50=2500 messages
 732                          * (ca. 100kb).
 733                          * */
 734                         force_check_log_size();
 735
 736                 } /* end for num */
 737         } /* end while 1 */
 738
 739 /* NOTREACHED   return True; */
 740 }
 741
 742 /****************************************************************************
 743  Reload printers
 744 **************************************************************************/
 745 void reload_printers(void)
 746 {
 747         int snum;
 748         int n_services = lp_numservices();
 749         int pnum = lp_servicenumber(PRINTERS_NAME);
 750         const char *pname;
 751
 752         pcap_cache_reload();
 753
 754         /* remove stale printers */
 755         for (snum = 0; snum < n_services; snum++) {
 756                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 757                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 758                                       lp_autoloaded(snum)))
 759                         continue;
 760
 761                 pname = lp_printername(snum);
 762                 if (!pcap_printername_ok(pname)) {
 763                         DEBUG(3, ("removing stale printer %s\n", pname));
 764
 765                         if (is_printer_published(NULL, snum, NULL))
 766                                 nt_printer_publish(NULL, snum, SPOOL_DS_UNPUBLISH);
 767                         del_a_printer(pname);
 768                         lp_killservice(snum);
 769                 }
 770         }
 771
 772         load_printers();
 773 }
 774
 775 /****************************************************************************
 776  Reload the services file.
 777 **************************************************************************/
 778
 779 bool reload_services(bool test)
 780 {
 781         bool ret;
 782
 783         if (lp_loaded()) {
 784                 char *fname = lp_configfile();
 785                 if (file_exist(fname, NULL) &&
 786                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 787                         set_dyn_CONFIGFILE(fname);
 788                         test = False;
 789                 }
 790         }
 791
 792         reopen_logs();
 793
 794         if (test && !lp_file_list_changed())
 795                 return(True);
 796
 797         lp_killunused(conn_snum_used);
 798
 799         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 800
 801         reload_printers();
 802
 803         /* perhaps the config filename is now set */
 804         if (!test)
 805                 reload_services(True);
 806
 807         reopen_logs();
 808
 809         load_interfaces();
 810
 811         if (smbd_server_fd() != -1) {
 812                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 813                 set_socket_options(smbd_server_fd(), lp_socket_options());
 814         }
 815
 816         mangle_reset_cache();
 817         reset_stat_cache();
 818
 819         /* this forces service parameters to be flushed */
 820         set_current_service(NULL,0,True);
 821
 822         return(ret);
 823 }
 824
 825 /****************************************************************************
 826  Exit the server.
 827 ****************************************************************************/
 828
 829 /* Reasons for shutting down a server process. */
 830 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 831
 832 static void exit_server_common(enum server_exit_reason how,
 833         const char *const reason) NORETURN_ATTRIBUTE;
 834
 835 static void exit_server_common(enum server_exit_reason how,
 836         const char *const reason)
 837 {
 838         static int firsttime=1;
 839
 840         if (!firsttime)
 841                 exit(0);
 842         firsttime = 0;
 843
 844         change_to_root_user();
 845
 846         if (negprot_global_auth_context) {
 847                 (negprot_global_auth_context->free)(&negprot_global_auth_context);
 848         }
 849
 850         conn_close_all();
 851
 852         invalidate_all_vuids();
 853
 854         /* 3 second timeout. */
 855         print_notify_send_messages(smbd_messaging_context(), 3);
 856
 857         /* delete our entry in the connections database. */
 858         yield_connection(NULL,"");
 859
 860         respond_to_all_remaining_local_messages();
 861
 862 #ifdef WITH_DFS
 863         if (dcelogin_atmost_once) {
 864                 dfs_unlogin();
 865         }
 866 #endif
 867
 868         locking_end();
 869         printing_end();
 870
 871         if (how != SERVER_EXIT_NORMAL) {
 872                 int oldlevel = DEBUGLEVEL;
 873
 874                 DEBUGLEVEL = 10;
 875
 876                 DEBUGSEP(0);
 877                 DEBUG(0,("Abnormal server exit: %s\n",
 878                         reason ? reason : "no explanation provided"));
 879                 DEBUGSEP(0);
 880
 881                 log_stack_trace();
 882
 883                 DEBUGLEVEL = oldlevel;
 884                 dump_core();
 885
 886         } else {
 887                 DEBUG(3,("Server exit (%s)\n",
 888                         (reason ? reason : "normal exit")));
 889         }
 890
 891         exit(0);
 892 }
 893
 894 void exit_server(const char *const explanation)
 895 {
 896         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 897 }
 898
 899 void exit_server_cleanly(const char *const explanation)
 900 {
 901         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 902 }
 903
 904 void exit_server_fault(void)
 905 {
 906         exit_server("critical server fault");
 907 }
 908
 909 /****************************************************************************
 910  Initialise connect, service and file structs.
 911 ****************************************************************************/
 912
 913 static bool init_structs(void )
 914 {
 915         /*
 916          * Set the machine NETBIOS name if not already
 917          * set from the config file.
 918          */
 919
 920         if (!init_names())
 921                 return False;
 922
 923         conn_init();
 924
 925         file_init();
 926
 927         /* for RPC pipes */
 928         init_rpc_pipe_hnd();
 929
 930         init_dptrs();
 931
 932         secrets_init();
 933
 934         return True;
 935 }
 936
 937 /*
 938  * Send keepalive packets to our client
 939  */
 940 static bool keepalive_fn(const struct timeval *now, void *private_data)
 941 {
 942         if (!send_keepalive(smbd_server_fd())) {
 943                 DEBUG( 2, ( "Keepalive failed - exiting.\n" ) );
 944                 return False;
 945         }
 946         return True;
 947 }
 948
 949 /*
 950  * Do the recurring check if we're idle
 951  */
 952 static bool deadtime_fn(const struct timeval *now, void *private_data)
 953 {
 954         if ((conn_num_open() == 0)
 955             || (conn_idle_all(now->tv_sec))) {
 956                 DEBUG( 2, ( "Closing idle connection\n" ) );
 957                 messaging_send(smbd_messaging_context(), procid_self(),
 958                                MSG_SHUTDOWN, &data_blob_null);
 959                 return False;
 960         }
 961
 962         return True;
 963 }
 964
 965
 966 /****************************************************************************
 967  main program.
 968 ****************************************************************************/
 969
 970 /* Declare prototype for build_options() to avoid having to run it through
 971    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 972    prototype generation system is too complicated. */
 973
 974 extern void build_options(bool screen);
 975
 976  int main(int argc,const char *argv[])
 977 {
 978         /* shall I run as a daemon */
 979         static bool is_daemon = False;
 980         static bool interactive = False;
 981         static bool Fork = True;
 982         static bool no_process_group = False;
 983         static bool log_stdout = False;
 984         static char *ports = NULL;
 985         static char *profile_level = NULL;
 986         int opt;
 987         poptContext pc;
 988         bool print_build_options = False;
 989         enum {
 990                 OPT_DAEMON = 1000,
 991                 OPT_INTERACTIVE,
 992                 OPT_FORK,
 993                 OPT_NO_PROCESS_GROUP,
 994                 OPT_LOG_STDOUT
 995         };
 996         struct poptOption long_options[] = {
 997         POPT_AUTOHELP
 998         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 999         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1000         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1001         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1002         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1003         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1004         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1005         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1006         POPT_COMMON_SAMBA
1007         POPT_COMMON_DYNCONFIG
1008         POPT_TABLEEND
1009         };
1010         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1011
1012         TimeInit();
1013
1014 #ifdef HAVE_SET_AUTH_PARAMETERS
1015         set_auth_parameters(argc,argv);
1016 #endif
1017
1018         pc = poptGetContext("smbd", argc, argv, long_options, 0);
1019         while((opt = poptGetNextOpt(pc)) != -1) {
1020                 switch (opt)  {
1021                 case OPT_DAEMON:
1022                         is_daemon = true;
1023                         break;
1024                 case OPT_INTERACTIVE:
1025                         interactive = true;
1026                         break;
1027                 case OPT_FORK:
1028                         Fork = false;
1029                         break;
1030                 case OPT_NO_PROCESS_GROUP:
1031                         no_process_group = true;
1032                         break;
1033                 case OPT_LOG_STDOUT:
1034                         log_stdout = true;
1035                         break;
1036                 case 'b':
1037                         print_build_options = True;
1038                         break;
1039                 default:
1040                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1041                                   poptBadOption(pc, 0), poptStrerror(opt));
1042                         poptPrintUsage(pc, stderr, 0);
1043                         exit(1);
1044                 }
1045         }
1046         poptFreeContext(pc);
1047
1048         if (interactive) {
1049                 Fork = False;
1050                 log_stdout = True;
1051         }
1052
1053         setup_logging(argv[0],log_stdout);
1054
1055         if (print_build_options) {
1056                 build_options(True); /* Display output to screen as well as debug */
1057                 exit(0);
1058         }
1059
1060         load_case_tables();
1061
1062 #ifdef HAVE_SETLUID
1063         /* needed for SecureWare on SCO */
1064         setluid(0);
1065 #endif
1066
1067         sec_init();
1068
1069         set_remote_machine_name("smbd", False);
1070
1071         if (interactive && (DEBUGLEVEL >= 9)) {
1072                 talloc_enable_leak_report();
1073         }
1074
1075         if (log_stdout && Fork) {
1076                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1077                 exit(1);
1078         }
1079
1080         /* we want to re-seed early to prevent time delays causing
1081            client problems at a later date. (tridge) */
1082         generate_random_buffer(NULL, 0);
1083
1084         /* make absolutely sure we run as root - to handle cases where people
1085            are crazy enough to have it setuid */
1086
1087         gain_root_privilege();
1088         gain_root_group_privilege();
1089
1090         fault_setup((void (*)(void *))exit_server_fault);
1091         dump_core_setup("smbd");
1092
1093         CatchSignal(SIGTERM , SIGNAL_CAST sig_term);
1094         CatchSignal(SIGHUP,SIGNAL_CAST sig_hup);
1095
1096         /* we are never interested in SIGPIPE */
1097         BlockSignals(True,SIGPIPE);
1098
1099 #if defined(SIGFPE)
1100         /* we are never interested in SIGFPE */
1101         BlockSignals(True,SIGFPE);
1102 #endif
1103
1104 #if defined(SIGUSR2)
1105         /* We are no longer interested in USR2 */
1106         BlockSignals(True,SIGUSR2);
1107 #endif
1108
1109         /* POSIX demands that signals are inherited. If the invoking process has
1110          * these signals masked, we will have problems, as we won't recieve them. */
1111         BlockSignals(False, SIGHUP);
1112         BlockSignals(False, SIGUSR1);
1113         BlockSignals(False, SIGTERM);
1114
1115         /* we want total control over the permissions on created files,
1116            so set our umask to 0 */
1117         umask(0);
1118
1119         init_sec_ctx();
1120
1121         reopen_logs();
1122
1123         DEBUG(0,("smbd version %s started.\n", SAMBA_VERSION_STRING));
1124         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1125
1126         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1127                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1128
1129         /* Output the build options to the debug log */
1130         build_options(False);
1131
1132         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1133                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1134                 exit(1);
1135         }
1136
1137         /*
1138          * Do this before reload_services.
1139          */
1140
1141         if (!reload_services(False))
1142                 return(-1);
1143
1144         init_structs();
1145
1146 #ifdef WITH_PROFILE
1147         if (!profile_setup(smbd_messaging_context(), False)) {
1148                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1149                 return -1;
1150         }
1151         if (profile_level != NULL) {
1152                 int pl = atoi(profile_level);
1153                 struct server_id src;
1154
1155                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1156                 src.pid = getpid();
1157                 set_profile_level(pl, src);
1158         }
1159 #endif
1160
1161         DEBUG(3,( "loaded services\n"));
1162
1163         if (!is_daemon && !is_a_socket(0)) {
1164                 if (!interactive)
1165                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1166
1167                 /*
1168                  * Setting is_daemon here prevents us from eventually calling
1169                  * the open_sockets_inetd()
1170                  */
1171
1172                 is_daemon = True;
1173         }
1174
1175         if (is_daemon && !interactive) {
1176                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1177                 become_daemon(Fork, no_process_group);
1178         }
1179
1180 #if HAVE_SETPGID
1181         /*
1182          * If we're interactive we want to set our own process group for
1183          * signal management.
1184          */
1185         if (interactive && !no_process_group)
1186                 setpgid( (pid_t)0, (pid_t)0);
1187 #endif
1188
1189         if (!directory_exist(lp_lockdir(), NULL))
1190                 mkdir(lp_lockdir(), 0755);
1191
1192         if (is_daemon)
1193                 pidfile_create("smbd");
1194
1195         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1196
1197         if (smbd_messaging_context() == NULL)
1198                 exit(1);
1199
1200         if (smbd_memcache() == NULL) {
1201                 exit(1);
1202         }
1203
1204         memcache_set_global(smbd_memcache());
1205
1206         /* Initialise the password backed before the global_sam_sid
1207            to ensure that we fetch from ldap before we make a domain sid up */
1208
1209         if(!initialize_password_db(False, smbd_event_context()))
1210                 exit(1);
1211
1212         if (!secrets_init()) {
1213                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1214                 exit(1);
1215         }
1216
1217         if(!get_global_sam_sid()) {
1218                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1219                 exit(1);
1220         }
1221
1222         if (!session_init())
1223                 exit(1);
1224
1225         if (!connections_init(True))
1226                 exit(1);
1227
1228         if (!locking_init())
1229                 exit(1);
1230
1231         namecache_enable();
1232
1233         if (!init_registry())
1234                 exit(1);
1235
1236 #if 0
1237         if (!init_svcctl_db())
1238                 exit(1);
1239 #endif
1240
1241         if (!print_backend_init(smbd_messaging_context()))
1242                 exit(1);
1243
1244         if (!init_guest_info()) {
1245                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1246                 return -1;
1247         }
1248
1249         /* only start the background queue daemon if we are
1250            running as a daemon -- bad things will happen if
1251            smbd is launched via inetd and we fork a copy of
1252            ourselves here */
1253
1254         if ( is_daemon && !interactive )
1255                 start_background_queue();
1256
1257         /* Always attempt to initialize DMAPI. We will only use it later if
1258          * lp_dmapi_support is set on the share, but we need a single global
1259          * session to work with.
1260          */
1261         dmapi_init_session();
1262
1263         if (!open_sockets_smbd(is_daemon, interactive, ports))
1264                 exit(1);
1265
1266         /*
1267          * everything after this point is run after the fork()
1268          */
1269
1270         static_init_rpc;
1271
1272         init_modules();
1273
1274         /* Possibly reload the services file. Only worth doing in
1275          * daemon mode. In inetd mode, we know we only just loaded this.
1276          */
1277         if (is_daemon) {
1278                 reload_services(True);
1279         }
1280
1281         if (!init_account_policy()) {
1282                 DEBUG(0,("Could not open account policy tdb.\n"));
1283                 exit(1);
1284         }
1285
1286         if (*lp_rootdir()) {
1287                 if (sys_chroot(lp_rootdir()) == 0)
1288                         DEBUG(2,("Changed root to %s\n", lp_rootdir()));
1289         }
1290
1291         /* Setup oplocks */
1292         if (!init_oplocks(smbd_messaging_context()))
1293                 exit(1);
1294
1295         /* Setup aio signal handler. */
1296         initialize_async_io_handler();
1297
1298         /*
1299          * For clustering, we need to re-init our ctdbd connection after the
1300          * fork
1301          */
1302         if (!NT_STATUS_IS_OK(messaging_reinit(smbd_messaging_context())))
1303                 exit(1);
1304
1305         /* register our message handlers */
1306         messaging_register(smbd_messaging_context(), NULL,
1307                            MSG_SMB_FORCE_TDIS, msg_force_tdis);
1308
1309         if ((lp_keepalive() != 0)
1310             && !(event_add_idle(smbd_event_context(), NULL,
1311                                 timeval_set(lp_keepalive(), 0),
1312                                 "keepalive", keepalive_fn,
1313                                 NULL))) {
1314                 DEBUG(0, ("Could not add keepalive event\n"));
1315                 exit(1);
1316         }
1317
1318         if (!(event_add_idle(smbd_event_context(), NULL,
1319                              timeval_set(IDLE_CLOSED_TIMEOUT, 0),
1320                              "deadtime", deadtime_fn, NULL))) {
1321                 DEBUG(0, ("Could not add deadtime event\n"));
1322                 exit(1);
1323         }
1324
1325         TALLOC_FREE(frame);
1326
1327         smbd_process();
1328
1329         namecache_shutdown();
1330
1331         exit_server_cleanly(NULL);
1332         return(0);
1333 }