source/nsswitch/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24 */
  25
  26 #include "includes.h"
  27 #include "winbindd.h"
  28
  29 BOOL opt_nocache = False;
  30 BOOL opt_dual_daemon = True;
  31 static BOOL interactive = False;
  32
  33 extern BOOL override_logfile;
  34
  35 /* Reload configuration */
  36
  37 static BOOL reload_services_file(void)
  38 {
  39         BOOL ret;
  40
  41         if (lp_loaded()) {
  42                 pstring fname;
  43
  44                 pstrcpy(fname,lp_configfile());
  45                 if (file_exist(fname,NULL) && !strcsequal(fname,dyn_CONFIGFILE)) {
  46                         pstrcpy(dyn_CONFIGFILE,fname);
  47                 }
  48         }
  49
  50         reopen_logs();
  51         ret = lp_load(dyn_CONFIGFILE,False,False,True);
  52
  53         reopen_logs();
  54         load_interfaces();
  55
  56         return(ret);
  57 }
  58
  59
  60 #if DUMP_CORE
  61
  62 /**************************************************************************** **
  63  Prepare to dump a core file - carefully!
  64  **************************************************************************** */
  65
  66 static BOOL dump_core(void)
  67 {
  68         char *p;
  69         pstring dname;
  70         pstrcpy( dname, lp_logfile() );
  71         if ((p=strrchr(dname,'/')))
  72                 *p=0;
  73         pstrcat( dname, "/corefiles" );
  74         mkdir( dname, 0700 );
  75         sys_chown( dname, getuid(), getgid() );
  76         chmod( dname, 0700 );
  77         if ( chdir(dname) )
  78                 return( False );
  79         umask( ~(0700) );
  80
  81 #ifdef HAVE_GETRLIMIT
  82 #ifdef RLIMIT_CORE
  83         {
  84                 struct rlimit rlp;
  85                 getrlimit( RLIMIT_CORE, &rlp );
  86                 rlp.rlim_cur = MAX( 4*1024*1024, rlp.rlim_cur );
  87                 setrlimit( RLIMIT_CORE, &rlp );
  88                 getrlimit( RLIMIT_CORE, &rlp );
  89                 DEBUG( 3, ( "Core limits now %d %d\n", (int)rlp.rlim_cur, (int)rlp.rlim_max ) );
  90         }
  91 #endif
  92 #endif
  93
  94         DEBUG(0,("Dumping core in %s\n",dname));
  95         abort();
  96         return( True );
  97 } /* dump_core */
  98 #endif
  99
 100 /**************************************************************************** **
 101  Handle a fault..
 102  **************************************************************************** */
 103
 104 static void fault_quit(void)
 105 {
 106 #if DUMP_CORE
 107         dump_core();
 108 #endif
 109 }
 110
 111 static void winbindd_status(void)
 112 {
 113         struct winbindd_cli_state *tmp;
 114
 115         DEBUG(0, ("winbindd status:\n"));
 116
 117         /* Print client state information */
 118
 119         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 120
 121         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 122                 DEBUG(2, ("\tclient list:\n"));
 123                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 124                         DEBUG(2, ("\t\tpid %lu, sock %d, rbl %d, wbl %d\n",
 125                                   (unsigned long)tmp->pid, tmp->sock, tmp->read_buf_len,
 126                                   tmp->write_buf_len));
 127                 }
 128         }
 129 }
 130
 131 /* Print winbindd status to log file */
 132
 133 static void print_winbindd_status(void)
 134 {
 135         winbindd_status();
 136 }
 137
 138 /* Flush client cache */
 139
 140 static void flush_caches(void)
 141 {
 142 #if 0
 143         /* Clear cached user and group enumation info */
 144         if (!opt_dual_daemon) /* Until we have coherent cache flush. */
 145                 wcache_flush_cache();
 146 #endif
 147
 148         /* We need to invalidate cached user list entries on a SIGHUP
 149            otherwise cached access denied errors due to restrict anonymous
 150            hang around until the sequence number changes. */
 151
 152         wcache_invalidate_cache();
 153 }
 154
 155 /* Handle the signal by unlinking socket and exiting */
 156
 157 static void terminate(void)
 158 {
 159         pstring path;
 160
 161         idmap_close();
 162
 163         /* Remove socket file */
 164         pstr_sprintf(path, "%s/%s",
 165                  WINBINDD_SOCKET_DIR, WINBINDD_SOCKET_NAME);
 166         unlink(path);
 167
 168 #if 0
 169         if (interactive) {
 170                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 171                 char *description = talloc_describe_all(mem_ctx);
 172
 173                 DEBUG(3, ("tallocs left:\n%s\n", description));
 174                 talloc_destroy(mem_ctx);
 175         }
 176 #endif
 177
 178         exit(0);
 179 }
 180
 181 static BOOL do_sigterm;
 182
 183 static void termination_handler(int signum)
 184 {
 185         do_sigterm = True;
 186         sys_select_signal();
 187 }
 188
 189 static BOOL do_sigusr2;
 190
 191 static void sigusr2_handler(int signum)
 192 {
 193         do_sigusr2 = True;
 194         sys_select_signal();
 195 }
 196
 197 static BOOL do_sighup;
 198
 199 static void sighup_handler(int signum)
 200 {
 201         do_sighup = True;
 202         sys_select_signal();
 203 }
 204
 205 static BOOL do_sigchld;
 206
 207 static void sigchld_handler(int signum)
 208 {
 209         do_sigchld = True;
 210         sys_select_signal();
 211 }
 212
 213 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 214 static void msg_reload_services(int msg_type, pid_t src, void *buf, size_t len)
 215 {
 216         /* Flush various caches */
 217         flush_caches();
 218         reload_services_file();
 219 }
 220
 221 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 222 static void msg_shutdown(int msg_type, pid_t src, void *buf, size_t len)
 223 {
 224         terminate();
 225 }
 226
 227 static struct winbindd_dispatch_table dispatch_table[] = {
 228
 229         /* User functions */
 230
 231         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 232         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 233
 234         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 235         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 236         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 237
 238         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 239         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 240         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 241           "GETUSERDOMGROUPS" },
 242
 243         /* Group functions */
 244
 245         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 246         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 247         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 248         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 249         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 250         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 251
 252         /* PAM auth functions */
 253
 254         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 255         { WINBINDD_PAM_AUTH_CRAP, winbindd_crap_auth, "AUTH_CRAP" },
 256         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 257
 258         /* Enumeration functions */
 259
 260         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 261         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 262         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 263           "LIST_TRUSTDOM" },
 264         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 265
 266         /* SID related functions */
 267
 268         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 269         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 270
 271         /* Lookup related functions */
 272
 273         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 274         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 275         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 276         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 277         { WINBINDD_ALLOCATE_RID, winbindd_allocate_rid, "ALLOCATE_RID" },
 278         { WINBINDD_ALLOCATE_RID_AND_GID, winbindd_allocate_rid_and_gid,
 279           "ALLOCATE_RID_AND_GID" },
 280
 281         /* Miscellaneous */
 282
 283         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 284         { WINBINDD_PING, winbindd_ping, "PING" },
 285         { WINBINDD_INFO, winbindd_info, "INFO" },
 286         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 287           "INTERFACE_VERSION" },
 288         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 289         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 290         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 291         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 292           "WINBINDD_PRIV_PIPE_DIR" },
 293         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 294
 295         /* WINS functions */
 296
 297         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 298         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 299
 300         /* End of list */
 301
 302         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 303 };
 304
 305 static void process_request(struct winbindd_cli_state *state)
 306 {
 307         struct winbindd_dispatch_table *table = dispatch_table;
 308
 309         /* Free response data - we may be interrupted and receive another
 310            command before being able to send this data off. */
 311
 312         SAFE_FREE(state->response.extra_data);
 313
 314         ZERO_STRUCT(state->response);
 315
 316         state->response.result = WINBINDD_PENDING;
 317         state->response.length = sizeof(struct winbindd_response);
 318
 319         state->mem_ctx = talloc_init("winbind request");
 320         if (state->mem_ctx == NULL)
 321                 return;
 322
 323         /* Process command */
 324
 325         for (table = dispatch_table; table->fn; table++) {
 326                 if (state->request.cmd == table->cmd) {
 327                         DEBUG(10,("process_request: request fn %s\n",
 328                                   table->winbindd_cmd_name ));
 329                         state->response.result = table->fn(state);
 330                         break;
 331                 }
 332         }
 333
 334         if (!table->fn) {
 335                 DEBUG(10,("process_request: unknown request fn number %d\n",
 336                           (int)state->request.cmd ));
 337                 state->response.result = WINBINDD_ERROR;
 338         }
 339 }
 340
 341 /*
 342  * A list of file descriptors being monitored by select in the main processing
 343  * loop. fd_event->handler is called whenever the socket is readable/writable.
 344  */
 345
 346 static struct fd_event *fd_events = NULL;
 347
 348 void add_fd_event(struct fd_event *ev)
 349 {
 350         struct fd_event *match;
 351
 352         /* only add unique fd_event structs */
 353
 354         for (match=fd_events; match; match=match->next ) {
 355 #ifdef DEVELOPER
 356                 SMB_ASSERT( match != ev );
 357 #else
 358                 if ( match == ev )
 359                         return;
 360 #endif
 361         }
 362
 363         DLIST_ADD(fd_events, ev);
 364 }
 365
 366 void remove_fd_event(struct fd_event *ev)
 367 {
 368         DLIST_REMOVE(fd_events, ev);
 369 }
 370
 371 /*
 372  * Handler for fd_events to complete a read/write request, set up by
 373  * setup_async_read/setup_async_write.
 374  */
 375
 376 static void rw_callback(struct fd_event *event, int flags)
 377 {
 378         size_t todo;
 379         ssize_t done = 0;
 380
 381         todo = event->length - event->done;
 382
 383         if (event->flags & EVENT_FD_WRITE) {
 384                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 385                 done = sys_write(event->fd,
 386                                  &((char *)event->data)[event->done],
 387                                  todo);
 388
 389                 if (done <= 0) {
 390                         event->flags = 0;
 391                         event->finished(event->private, False);
 392                         return;
 393                 }
 394         }
 395
 396         if (event->flags & EVENT_FD_READ) {
 397                 SMB_ASSERT(flags == EVENT_FD_READ);
 398                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 399                                 todo);
 400
 401                 if (done <= 0) {
 402                         event->flags = 0;
 403                         event->finished(event->private, False);
 404                         return;
 405                 }
 406         }
 407
 408         event->done += done;
 409
 410         if (event->done == event->length) {
 411                 event->flags = 0;
 412                 event->finished(event->private, True);
 413         }
 414 }
 415
 416 /*
 417  * Request an async read/write on a fd_event structure. (*finished) is called
 418  * when the request is completed or an error had occurred.
 419  */
 420
 421 void setup_async_read(struct fd_event *event, void *data, size_t length,
 422                       void (*finished)(void *private, BOOL success),
 423                       void *private)
 424 {
 425         SMB_ASSERT(event->flags == 0);
 426         event->data = data;
 427         event->length = length;
 428         event->done = 0;
 429         event->handler = rw_callback;
 430         event->finished = finished;
 431         event->private = private;
 432         event->flags = EVENT_FD_READ;
 433 }
 434
 435 void setup_async_write(struct fd_event *event, void *data, size_t length,
 436                        void (*finished)(void *private, BOOL success),
 437                        void *private)
 438 {
 439         SMB_ASSERT(event->flags == 0);
 440         event->data = data;
 441         event->length = length;
 442         event->done = 0;
 443         event->handler = rw_callback;
 444         event->finished = finished;
 445         event->private = private;
 446         event->flags = EVENT_FD_WRITE;
 447 }
 448
 449 /*
 450  * This is the main event loop of winbind requests. It goes through a
 451  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 452  *
 453  * An idle winbind client has a read request of 4 bytes outstanding,
 454  * finalizing function is request_len_recv, checking the length. request_recv
 455  * then processes the packet. The processing function then at some point has
 456  * to call request_finished which schedules sending the response.
 457  */
 458
 459 static void request_len_recv(void *private, BOOL success);
 460 static void request_recv(void *private, BOOL success);
 461 void request_finished(struct winbindd_cli_state *state);
 462 void request_finished_cont(void *private, BOOL success);
 463 static void response_main_sent(void *private, BOOL success);
 464 static void response_extra_sent(void *private, BOOL success);
 465
 466 static void response_extra_sent(void *private, BOOL success)
 467 {
 468         struct winbindd_cli_state *state =
 469                 talloc_get_type_abort(private, struct winbindd_cli_state);
 470
 471         if (state->mem_ctx != NULL) {
 472                 talloc_destroy(state->mem_ctx);
 473                 state->mem_ctx = NULL;
 474         }
 475
 476         if (!success) {
 477                 state->finished = True;
 478                 return;
 479         }
 480
 481         SAFE_FREE(state->response.extra_data);
 482
 483         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 484                          request_len_recv, state);
 485 }
 486
 487 static void response_main_sent(void *private, BOOL success)
 488 {
 489         struct winbindd_cli_state *state =
 490                 talloc_get_type_abort(private, struct winbindd_cli_state);
 491
 492         if (!success) {
 493                 state->finished = True;
 494                 return;
 495         }
 496
 497         if (state->response.length == sizeof(state->response)) {
 498                 if (state->mem_ctx != NULL) {
 499                         talloc_destroy(state->mem_ctx);
 500                         state->mem_ctx = NULL;
 501                 }
 502
 503                 setup_async_read(&state->fd_event, &state->request,
 504                                  sizeof(uint32), request_len_recv, state);
 505                 return;
 506         }
 507
 508         setup_async_write(&state->fd_event, state->response.extra_data,
 509                           state->response.length - sizeof(state->response),
 510                           response_extra_sent, state);
 511 }
 512
 513 void request_finished(struct winbindd_cli_state *state)
 514 {
 515         setup_async_write(&state->fd_event, &state->response,
 516                           sizeof(state->response), response_main_sent, state);
 517 }
 518
 519 void request_finished_cont(void *private, BOOL success)
 520 {
 521         struct winbindd_cli_state *state =
 522                 talloc_get_type_abort(private, struct winbindd_cli_state);
 523
 524         if (!success)
 525                 state->response.result = WINBINDD_ERROR;
 526         request_finished(state);
 527 }
 528
 529 static void request_recv(void *private, BOOL success)
 530 {
 531         struct winbindd_cli_state *state =
 532                 talloc_get_type_abort(private, struct winbindd_cli_state);
 533
 534         if (!success) {
 535                 state->finished = True;
 536                 return;
 537         }
 538
 539         process_request(state);
 540
 541         if (state->response.result != WINBINDD_PENDING)
 542                 request_finished(state);
 543 }
 544
 545 static void request_len_recv(void *private, BOOL success)
 546 {
 547         struct winbindd_cli_state *state =
 548                 talloc_get_type_abort(private, struct winbindd_cli_state);
 549
 550         if (!success) {
 551                 state->finished = True;
 552                 return;
 553         }
 554
 555         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 556                 DEBUG(0,("process_loop: Invalid request size received: %d\n",
 557                          *(uint32 *)(&state->request)));
 558                 state->finished = True;
 559                 return;
 560         }
 561
 562         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 563                          sizeof(state->request) - sizeof(uint32),
 564                          request_recv, state);
 565 }
 566
 567 /* Process a new connection by adding it to the client connection list */
 568
 569 static void new_connection(int listen_sock, BOOL privileged)
 570 {
 571         struct sockaddr_un sunaddr;
 572         struct winbindd_cli_state *state;
 573         socklen_t len;
 574         int sock;
 575
 576         /* Accept connection */
 577
 578         len = sizeof(sunaddr);
 579
 580         do {
 581                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 582         } while (sock == -1 && errno == EINTR);
 583
 584         if (sock == -1)
 585                 return;
 586
 587         DEBUG(6,("accepted socket %d\n", sock));
 588
 589         /* Create new connection structure */
 590
 591         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL)
 592                 return;
 593
 594         state->sock = sock;
 595
 596         state->last_access = time(NULL);
 597
 598         state->privileged = privileged;
 599
 600         state->fd_event.fd = state->sock;
 601         state->fd_event.flags = 0;
 602         add_fd_event(&state->fd_event);
 603
 604         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 605                          request_len_recv, state);
 606
 607         /* Add to connection list */
 608
 609         winbindd_add_client(state);
 610 }
 611
 612 /* Remove a client connection from client connection list */
 613
 614 static void remove_client(struct winbindd_cli_state *state)
 615 {
 616         /* It's a dead client - hold a funeral */
 617
 618         if (state != NULL) {
 619
 620                 /* Close socket */
 621
 622                 close(state->sock);
 623
 624                 /* Free any getent state */
 625
 626                 free_getent_state(state->getpwent_state);
 627                 free_getent_state(state->getgrent_state);
 628
 629                 /* We may have some extra data that was not freed if the
 630                    client was killed unexpectedly */
 631
 632                 SAFE_FREE(state->response.extra_data);
 633
 634                 if (state->mem_ctx != NULL) {
 635                         talloc_destroy(state->mem_ctx);
 636                         state->mem_ctx = NULL;
 637                 }
 638
 639                 remove_fd_event(&state->fd_event);
 640
 641                 /* Remove from list and free */
 642
 643                 winbindd_remove_client(state);
 644                 talloc_free(state);
 645         }
 646 }
 647
 648
 649 /* Shutdown client connection which has been idle for the longest time */
 650
 651 static BOOL remove_idle_client(void)
 652 {
 653         struct winbindd_cli_state *state, *remove_state = NULL;
 654         time_t last_access = 0;
 655         int nidle = 0;
 656
 657         for (state = winbindd_client_list(); state; state = state->next) {
 658                 if (state->read_buf_len == 0 && state->write_buf_len == 0 &&
 659                     state->response.result != WINBINDD_PENDING &&
 660                     !state->getpwent_state && !state->getgrent_state) {
 661                         nidle++;
 662                         if (!last_access || state->last_access < last_access) {
 663                                 last_access = state->last_access;
 664                                 remove_state = state;
 665                         }
 666                 }
 667         }
 668
 669         if (remove_state) {
 670                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 671                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 672                 remove_client(remove_state);
 673                 return True;
 674         }
 675
 676         return False;
 677 }
 678
 679 /* Process a complete received packet from a client */
 680
 681 void winbind_process_packet(struct winbindd_cli_state *state)
 682 {
 683         /* Process request */
 684
 685         /* Ensure null termination of entire request */
 686         state->request.null_term = '\0';
 687
 688         state->pid = state->request.pid;
 689
 690         process_request(state);
 691
 692         /* Update client state */
 693
 694         state->read_buf_len = 0;
 695         state->write_buf_len = sizeof(struct winbindd_response);
 696
 697         /* we might need to send it to the dual daemon */
 698         if (opt_dual_daemon) {
 699                 dual_send_request(state);
 700         }
 701 }
 702
 703 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 704    non-forking, non-threaded model which allows us to handle many
 705    simultaneous connections while remaining impervious to many denial of
 706    service attacks. */
 707
 708 static void process_loop(void)
 709 {
 710         struct winbindd_cli_state *state;
 711         struct fd_event *ev;
 712         fd_set r_fds, w_fds;
 713         int maxfd, listen_sock, listen_priv_sock, selret;
 714         struct timeval timeout;
 715
 716         /* We'll be doing this a lot */
 717
 718         /* Handle messages */
 719
 720         message_dispatch();
 721
 722         /* refresh the trusted domain cache */
 723
 724         rescan_trusted_domains();
 725
 726         /* Free up temporary memory */
 727
 728         lp_talloc_free();
 729         main_loop_talloc_free();
 730
 731         /* Initialise fd lists for select() */
 732
 733         listen_sock = open_winbindd_socket();
 734         listen_priv_sock = open_winbindd_priv_socket();
 735
 736         if (listen_sock == -1 || listen_priv_sock == -1) {
 737                 perror("open_winbind_socket");
 738                 exit(1);
 739         }
 740
 741         maxfd = MAX(listen_sock, listen_priv_sock);
 742
 743         FD_ZERO(&r_fds);
 744         FD_ZERO(&w_fds);
 745         FD_SET(listen_sock, &r_fds);
 746         FD_SET(listen_priv_sock, &r_fds);
 747
 748         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 749         timeout.tv_usec = 0;
 750
 751         if (opt_dual_daemon) {
 752                 maxfd = dual_select_setup(&w_fds, maxfd);
 753         }
 754
 755         /* Set up client readers and writers */
 756
 757         state = winbindd_client_list();
 758
 759         while (state) {
 760
 761                 struct winbindd_cli_state *next = state->next;
 762
 763                 /* Dispose of client connection if it is marked as
 764                    finished */
 765
 766                 if (state->finished)
 767                         remove_client(state);
 768
 769                 state = next;
 770         }
 771
 772         for (ev = fd_events; ev; ev = ev->next) {
 773                 if (ev->flags & EVENT_FD_READ) {
 774                         FD_SET(ev->fd, &r_fds);
 775                         maxfd = MAX(ev->fd, maxfd);
 776                 }
 777                 if (ev->flags & EVENT_FD_WRITE) {
 778                         FD_SET(ev->fd, &w_fds);
 779                         maxfd = MAX(ev->fd, maxfd);
 780                 }
 781         }
 782
 783         /* Call select */
 784
 785         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 786
 787         if (selret == 0)
 788                 goto no_fds_ready;
 789
 790         if ((selret == -1 && errno != EINTR) || selret == 0) {
 791
 792                 /* Select error, something is badly wrong */
 793
 794                 perror("select");
 795                 exit(1);
 796         }
 797
 798         /* Create a new connection if listen_sock readable */
 799
 800         if (opt_dual_daemon) {
 801                 dual_select(&w_fds);
 802         }
 803
 804         ev = fd_events;
 805         while (ev != NULL) {
 806                 struct fd_event *next = ev->next;
 807                 int flags = 0;
 808                 if (FD_ISSET(ev->fd, &r_fds))
 809                         flags |= EVENT_FD_READ;
 810                 if (FD_ISSET(ev->fd, &w_fds))
 811                         flags |= EVENT_FD_WRITE;
 812                 if (flags)
 813                         ev->handler(ev, flags);
 814                 ev = next;
 815         }
 816
 817         if (FD_ISSET(listen_sock, &r_fds)) {
 818                 while (winbindd_num_clients() >
 819                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 820                         DEBUG(5,("winbindd: Exceeding %d client "
 821                                  "connections, removing idle "
 822                                  "connection.\n",
 823                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 824                         if (!remove_idle_client()) {
 825                                 DEBUG(0,("winbindd: Exceeding %d "
 826                                          "client connections, no idle "
 827                                          "connection found\n",
 828                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 829                                 break;
 830                         }
 831                 }
 832                 /* new, non-privileged connection */
 833                 new_connection(listen_sock, False);
 834         }
 835
 836         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 837                 while (winbindd_num_clients() >
 838                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 839                         DEBUG(5,("winbindd: Exceeding %d client "
 840                                  "connections, removing idle "
 841                                  "connection.\n",
 842                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 843                         if (!remove_idle_client()) {
 844                                 DEBUG(0,("winbindd: Exceeding %d "
 845                                          "client connections, no idle "
 846                                          "connection found\n",
 847                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 848                                 break;
 849                         }
 850                 }
 851                 /* new, privileged connection */
 852                 new_connection(listen_priv_sock, True);
 853         }
 854
 855  no_fds_ready:
 856
 857 #if 0
 858         winbindd_check_cache_size(time(NULL));
 859 #endif
 860
 861         /* Check signal handling things */
 862
 863         if (do_sigterm)
 864                 terminate();
 865
 866         if (do_sighup) {
 867
 868                 DEBUG(3, ("got SIGHUP\n"));
 869
 870                 msg_reload_services(MSG_SMB_CONF_UPDATED, (pid_t) 0, NULL, 0);
 871                 do_sighup = False;
 872         }
 873
 874         if (do_sigusr2) {
 875                 print_winbindd_status();
 876                 do_sigusr2 = False;
 877         }
 878
 879         if (do_sigchld) {
 880                 pid_t pid;
 881
 882                 do_sigchld = False;
 883
 884                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 885                         winbind_child_died(pid);
 886                 }
 887         }
 888 }
 889
 890 /* Main function */
 891
 892 struct winbindd_state server_state;   /* Server state information */
 893
 894 int main(int argc, char **argv)
 895 {
 896         pstring logfile;
 897         static BOOL Fork = True;
 898         static BOOL log_stdout = False;
 899         struct poptOption long_options[] = {
 900                 POPT_AUTOHELP
 901                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 902                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Daemon in foreground mode" },
 903                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 904                 { "single-daemon", 'Y', POPT_ARG_VAL, &opt_dual_daemon, False, "Single daemon mode" },
 905                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 906                 POPT_COMMON_SAMBA
 907                 POPT_TABLEEND
 908         };
 909         poptContext pc;
 910         int opt;
 911
 912         /* glibc (?) likes to print "User defined signal 1" and exit if a
 913            SIGUSR[12] is received before a handler is installed */
 914
 915         CatchSignal(SIGUSR1, SIG_IGN);
 916         CatchSignal(SIGUSR2, SIG_IGN);
 917
 918         fault_setup((void (*)(void *))fault_quit );
 919
 920         /* Initialise for running in non-root mode */
 921
 922         sec_init();
 923
 924         set_remote_machine_name("winbindd", False);
 925
 926         /* Set environment variable so we don't recursively call ourselves.
 927            This may also be useful interactively. */
 928
 929         setenv(WINBINDD_DONT_ENV, "1", 1);
 930
 931         /* Initialise samba/rpc client stuff */
 932
 933         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
 934                                                 POPT_CONTEXT_KEEP_FIRST);
 935
 936         while ((opt = poptGetNextOpt(pc)) != -1) {
 937                 switch (opt) {
 938                         /* Don't become a daemon */
 939                 case 'i':
 940                         interactive = True;
 941                         log_stdout = True;
 942                         Fork = False;
 943                         break;
 944                 }
 945         }
 946
 947
 948         if (log_stdout && Fork) {
 949                 printf("Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n");
 950                 poptPrintUsage(pc, stderr, 0);
 951                 exit(1);
 952         }
 953
 954         if (!override_logfile) {
 955                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
 956                 lp_set_logfile(logfile);
 957         }
 958         setup_logging("winbindd", log_stdout);
 959         reopen_logs();
 960
 961         DEBUG(1, ("winbindd version %s started.\n", SAMBA_VERSION_STRING) );
 962         DEBUGADD( 1, ( "Copyright The Samba Team 2000-2004\n" ) );
 963
 964         if (!reload_services_file()) {
 965                 DEBUG(0, ("error opening config file\n"));
 966                 exit(1);
 967         }
 968
 969         /* Setup names. */
 970
 971         if (!init_names())
 972                 exit(1);
 973
 974         load_interfaces();
 975
 976         if (!secrets_init()) {
 977
 978                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
 979                 return False;
 980         }
 981
 982         /* Enable netbios namecache */
 983
 984         namecache_enable();
 985
 986         /* Check winbindd parameters are valid */
 987
 988         ZERO_STRUCT(server_state);
 989
 990         /* Winbind daemon initialisation */
 991
 992         if ( (!winbindd_param_init()) || (!winbindd_upgrade_idmap()) ||
 993              (!idmap_init(lp_idmap_backend())) ) {
 994                 DEBUG(1, ("Could not init idmap -- netlogon proxy only\n"));
 995                 idmap_set_proxyonly();
 996         }
 997
 998         /* Unblock all signals we are interested in as they may have been
 999            blocked by the parent process. */
1000
1001         BlockSignals(False, SIGINT);
1002         BlockSignals(False, SIGQUIT);
1003         BlockSignals(False, SIGTERM);
1004         BlockSignals(False, SIGUSR1);
1005         BlockSignals(False, SIGUSR2);
1006         BlockSignals(False, SIGHUP);
1007         BlockSignals(False, SIGCHLD);
1008
1009         /* Setup signal handlers */
1010
1011         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1012         CatchSignal(SIGQUIT, termination_handler);
1013         CatchSignal(SIGTERM, termination_handler);
1014         CatchSignal(SIGCHLD, sigchld_handler);
1015
1016         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1017
1018         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1019         CatchSignal(SIGHUP, sighup_handler);
1020
1021         if (!interactive)
1022                 become_daemon(Fork);
1023
1024         pidfile_create("winbindd");
1025
1026 #if HAVE_SETPGID
1027         /*
1028          * If we're interactive we want to set our own process group for
1029          * signal management.
1030          */
1031         if (interactive)
1032                 setpgid( (pid_t)0, (pid_t)0);
1033 #endif
1034
1035         if (opt_dual_daemon) {
1036                 do_dual_daemon();
1037         }
1038
1039         /* Initialise messaging system */
1040
1041         if (!message_init()) {
1042                 DEBUG(0, ("unable to initialise messaging system\n"));
1043                 exit(1);
1044         }
1045
1046         /* React on 'smbcontrol winbindd reload-config' in the same way
1047            as to SIGHUP signal */
1048         message_register(MSG_SMB_CONF_UPDATED, msg_reload_services);
1049         message_register(MSG_SHUTDOWN, msg_shutdown);
1050
1051         poptFreeContext(pc);
1052
1053         netsamlogon_cache_init(); /* Non-critical */
1054
1055         init_domain_list();
1056
1057         init_idmap_child();
1058
1059         /* Loop waiting for requests */
1060
1061         while (1)
1062                 process_loop();
1063
1064         trustdom_cache_shutdown();
1065
1066         return 0;
1067 }