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(signum);
 187 }
 188
 189 static BOOL do_sigusr2;
 190
 191 static void sigusr2_handler(int signum)
 192 {
 193         do_sigusr2 = True;
 194         sys_select_signal(SIGUSR2);
 195 }
 196
 197 static BOOL do_sighup;
 198
 199 static void sighup_handler(int signum)
 200 {
 201         do_sighup = True;
 202         sys_select_signal(SIGHUP);
 203 }
 204
 205 static BOOL do_sigchld;
 206
 207 static void sigchld_handler(int signum)
 208 {
 209         do_sigchld = True;
 210         sys_select_signal(SIGCHLD);
 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 {
 228         enum winbindd_cmd cmd;
 229         void (*fn)(struct winbindd_cli_state *state);
 230         const char *winbindd_cmd_name;
 231 } dispatch_table[] = {
 232
 233         /* User functions */
 234
 235         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 236         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 237
 238         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 239         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 240         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 241
 242         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 243         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 244         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 245           "GETUSERDOMGROUPS" },
 246
 247         /* Group functions */
 248
 249         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 250         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 251         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 252         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 253         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 254         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 255
 256         /* PAM auth functions */
 257
 258         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 259         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 260         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 261
 262         /* Enumeration functions */
 263
 264         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 265         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 266         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 267           "LIST_TRUSTDOM" },
 268         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 269
 270         /* SID related functions */
 271
 272         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 273         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 274
 275         /* Lookup related functions */
 276
 277         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 278         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 279         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 280         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 281         { WINBINDD_ALLOCATE_RID, winbindd_allocate_rid, "ALLOCATE_RID" },
 282         { WINBINDD_ALLOCATE_RID_AND_GID, winbindd_allocate_rid_and_gid,
 283           "ALLOCATE_RID_AND_GID" },
 284
 285         /* Miscellaneous */
 286
 287         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 288         { WINBINDD_PING, winbindd_ping, "PING" },
 289         { WINBINDD_INFO, winbindd_info, "INFO" },
 290         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 291           "INTERFACE_VERSION" },
 292         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 293         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 294         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 295         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 296           "WINBINDD_PRIV_PIPE_DIR" },
 297         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 298
 299         /* WINS functions */
 300
 301         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 302         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 303
 304         /* End of list */
 305
 306         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 307 };
 308
 309 static void process_request(struct winbindd_cli_state *state)
 310 {
 311         struct winbindd_dispatch_table *table = dispatch_table;
 312
 313         /* Free response data - we may be interrupted and receive another
 314            command before being able to send this data off. */
 315
 316         SAFE_FREE(state->response.extra_data);
 317
 318         ZERO_STRUCT(state->response);
 319
 320         state->response.result = WINBINDD_PENDING;
 321         state->response.length = sizeof(struct winbindd_response);
 322
 323         state->mem_ctx = talloc_init("winbind request");
 324         if (state->mem_ctx == NULL)
 325                 return;
 326
 327         /* Process command */
 328
 329         for (table = dispatch_table; table->fn; table++) {
 330                 if (state->request.cmd == table->cmd) {
 331                         DEBUG(10,("process_request: request fn %s\n",
 332                                   table->winbindd_cmd_name ));
 333                         table->fn(state);
 334                         break;
 335                 }
 336         }
 337
 338         if (!table->fn) {
 339                 DEBUG(10,("process_request: unknown request fn number %d\n",
 340                           (int)state->request.cmd ));
 341                 request_error(state);
 342         }
 343 }
 344
 345 /*
 346  * A list of file descriptors being monitored by select in the main processing
 347  * loop. fd_event->handler is called whenever the socket is readable/writable.
 348  */
 349
 350 static struct fd_event *fd_events = NULL;
 351
 352 void add_fd_event(struct fd_event *ev)
 353 {
 354         struct fd_event *match;
 355
 356         /* only add unique fd_event structs */
 357
 358         for (match=fd_events; match; match=match->next ) {
 359 #ifdef DEVELOPER
 360                 SMB_ASSERT( match != ev );
 361 #else
 362                 if ( match == ev )
 363                         return;
 364 #endif
 365         }
 366
 367         DLIST_ADD(fd_events, ev);
 368 }
 369
 370 void remove_fd_event(struct fd_event *ev)
 371 {
 372         DLIST_REMOVE(fd_events, ev);
 373 }
 374
 375 /*
 376  * Handler for fd_events to complete a read/write request, set up by
 377  * setup_async_read/setup_async_write.
 378  */
 379
 380 static void rw_callback(struct fd_event *event, int flags)
 381 {
 382         size_t todo;
 383         ssize_t done = 0;
 384
 385         todo = event->length - event->done;
 386
 387         if (event->flags & EVENT_FD_WRITE) {
 388                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 389                 done = sys_write(event->fd,
 390                                  &((char *)event->data)[event->done],
 391                                  todo);
 392
 393                 if (done <= 0) {
 394                         event->flags = 0;
 395                         event->finished(event->private_data, False);
 396                         return;
 397                 }
 398         }
 399
 400         if (event->flags & EVENT_FD_READ) {
 401                 SMB_ASSERT(flags == EVENT_FD_READ);
 402                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 403                                 todo);
 404
 405                 if (done <= 0) {
 406                         event->flags = 0;
 407                         event->finished(event->private_data, False);
 408                         return;
 409                 }
 410         }
 411
 412         event->done += done;
 413
 414         if (event->done == event->length) {
 415                 event->flags = 0;
 416                 event->finished(event->private_data, True);
 417         }
 418 }
 419
 420 /*
 421  * Request an async read/write on a fd_event structure. (*finished) is called
 422  * when the request is completed or an error had occurred.
 423  */
 424
 425 void setup_async_read(struct fd_event *event, void *data, size_t length,
 426                       void (*finished)(void *private_data, BOOL success),
 427                       void *private_data)
 428 {
 429         SMB_ASSERT(event->flags == 0);
 430         event->data = data;
 431         event->length = length;
 432         event->done = 0;
 433         event->handler = rw_callback;
 434         event->finished = finished;
 435         event->private_data = private_data;
 436         event->flags = EVENT_FD_READ;
 437 }
 438
 439 void setup_async_write(struct fd_event *event, void *data, size_t length,
 440                        void (*finished)(void *private_data, BOOL success),
 441                        void *private_data)
 442 {
 443         SMB_ASSERT(event->flags == 0);
 444         event->data = data;
 445         event->length = length;
 446         event->done = 0;
 447         event->handler = rw_callback;
 448         event->finished = finished;
 449         event->private_data = private_data;
 450         event->flags = EVENT_FD_WRITE;
 451 }
 452
 453 /*
 454  * This is the main event loop of winbind requests. It goes through a
 455  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 456  *
 457  * An idle winbind client has a read request of 4 bytes outstanding,
 458  * finalizing function is request_len_recv, checking the length. request_recv
 459  * then processes the packet. The processing function then at some point has
 460  * to call request_finished which schedules sending the response.
 461  */
 462
 463 static void request_len_recv(void *private_data, BOOL success);
 464 static void request_recv(void *private_data, BOOL success);
 465 static void request_finished(struct winbindd_cli_state *state);
 466 void request_finished_cont(void *private_data, BOOL success);
 467 static void response_main_sent(void *private_data, BOOL success);
 468 static void response_extra_sent(void *private_data, BOOL success);
 469
 470 static void response_extra_sent(void *private_data, BOOL success)
 471 {
 472         struct winbindd_cli_state *state =
 473                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 474
 475         if (state->mem_ctx != NULL) {
 476                 talloc_destroy(state->mem_ctx);
 477                 state->mem_ctx = NULL;
 478         }
 479
 480         if (!success) {
 481                 state->finished = True;
 482                 return;
 483         }
 484
 485         SAFE_FREE(state->response.extra_data);
 486
 487         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 488                          request_len_recv, state);
 489 }
 490
 491 static void response_main_sent(void *private_data, BOOL success)
 492 {
 493         struct winbindd_cli_state *state =
 494                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 495
 496         if (!success) {
 497                 state->finished = True;
 498                 return;
 499         }
 500
 501         if (state->response.length == sizeof(state->response)) {
 502                 if (state->mem_ctx != NULL) {
 503                         talloc_destroy(state->mem_ctx);
 504                         state->mem_ctx = NULL;
 505                 }
 506
 507                 setup_async_read(&state->fd_event, &state->request,
 508                                  sizeof(uint32), request_len_recv, state);
 509                 return;
 510         }
 511
 512         setup_async_write(&state->fd_event, state->response.extra_data,
 513                           state->response.length - sizeof(state->response),
 514                           response_extra_sent, state);
 515 }
 516
 517 static void request_finished(struct winbindd_cli_state *state)
 518 {
 519         setup_async_write(&state->fd_event, &state->response,
 520                           sizeof(state->response), response_main_sent, state);
 521 }
 522
 523 void request_error(struct winbindd_cli_state *state)
 524 {
 525         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 526         state->response.result = WINBINDD_ERROR;
 527         request_finished(state);
 528 }
 529
 530 void request_ok(struct winbindd_cli_state *state)
 531 {
 532         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 533         state->response.result = WINBINDD_OK;
 534         request_finished(state);
 535 }
 536
 537 void request_finished_cont(void *private_data, BOOL success)
 538 {
 539         struct winbindd_cli_state *state =
 540                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 541
 542         if (success)
 543                 request_ok(state);
 544         else
 545                 request_error(state);
 546 }
 547
 548 static void request_recv(void *private_data, BOOL success)
 549 {
 550         struct winbindd_cli_state *state =
 551                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 552
 553         if (!success) {
 554                 state->finished = True;
 555                 return;
 556         }
 557
 558         process_request(state);
 559 }
 560
 561 static void request_len_recv(void *private_data, BOOL success)
 562 {
 563         struct winbindd_cli_state *state =
 564                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 565
 566         if (!success) {
 567                 state->finished = True;
 568                 return;
 569         }
 570
 571         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 572                 DEBUG(0,("process_loop: Invalid request size received: %d\n",
 573                          *(uint32 *)(&state->request)));
 574                 state->finished = True;
 575                 return;
 576         }
 577
 578         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 579                          sizeof(state->request) - sizeof(uint32),
 580                          request_recv, state);
 581 }
 582
 583 /* Process a new connection by adding it to the client connection list */
 584
 585 static void new_connection(int listen_sock, BOOL privileged)
 586 {
 587         struct sockaddr_un sunaddr;
 588         struct winbindd_cli_state *state;
 589         socklen_t len;
 590         int sock;
 591
 592         /* Accept connection */
 593
 594         len = sizeof(sunaddr);
 595
 596         do {
 597                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 598         } while (sock == -1 && errno == EINTR);
 599
 600         if (sock == -1)
 601                 return;
 602
 603         DEBUG(6,("accepted socket %d\n", sock));
 604
 605         /* Create new connection structure */
 606
 607         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL)
 608                 return;
 609
 610         state->sock = sock;
 611
 612         state->last_access = time(NULL);
 613
 614         state->privileged = privileged;
 615
 616         state->fd_event.fd = state->sock;
 617         state->fd_event.flags = 0;
 618         add_fd_event(&state->fd_event);
 619
 620         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 621                          request_len_recv, state);
 622
 623         /* Add to connection list */
 624
 625         winbindd_add_client(state);
 626 }
 627
 628 /* Remove a client connection from client connection list */
 629
 630 static void remove_client(struct winbindd_cli_state *state)
 631 {
 632         /* It's a dead client - hold a funeral */
 633
 634         if (state != NULL) {
 635
 636                 /* Close socket */
 637
 638                 close(state->sock);
 639
 640                 /* Free any getent state */
 641
 642                 free_getent_state(state->getpwent_state);
 643                 free_getent_state(state->getgrent_state);
 644
 645                 /* We may have some extra data that was not freed if the
 646                    client was killed unexpectedly */
 647
 648                 SAFE_FREE(state->response.extra_data);
 649
 650                 if (state->mem_ctx != NULL) {
 651                         talloc_destroy(state->mem_ctx);
 652                         state->mem_ctx = NULL;
 653                 }
 654
 655                 remove_fd_event(&state->fd_event);
 656
 657                 /* Remove from list and free */
 658
 659                 winbindd_remove_client(state);
 660                 talloc_free(state);
 661         }
 662 }
 663
 664
 665 /* Shutdown client connection which has been idle for the longest time */
 666
 667 static BOOL remove_idle_client(void)
 668 {
 669         struct winbindd_cli_state *state, *remove_state = NULL;
 670         time_t last_access = 0;
 671         int nidle = 0;
 672
 673         for (state = winbindd_client_list(); state; state = state->next) {
 674                 if (state->read_buf_len == 0 && state->write_buf_len == 0 &&
 675                     state->response.result != WINBINDD_PENDING &&
 676                     !state->getpwent_state && !state->getgrent_state) {
 677                         nidle++;
 678                         if (!last_access || state->last_access < last_access) {
 679                                 last_access = state->last_access;
 680                                 remove_state = state;
 681                         }
 682                 }
 683         }
 684
 685         if (remove_state) {
 686                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 687                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 688                 remove_client(remove_state);
 689                 return True;
 690         }
 691
 692         return False;
 693 }
 694
 695 /* Process a complete received packet from a client */
 696
 697 void winbind_process_packet(struct winbindd_cli_state *state)
 698 {
 699         /* Process request */
 700
 701         /* Ensure null termination of entire request */
 702         state->request.null_term = '\0';
 703
 704         state->pid = state->request.pid;
 705
 706         process_request(state);
 707
 708         /* Update client state */
 709
 710         state->read_buf_len = 0;
 711         state->write_buf_len = sizeof(struct winbindd_response);
 712
 713         /* we might need to send it to the dual daemon */
 714         if (opt_dual_daemon) {
 715                 dual_send_request(state);
 716         }
 717 }
 718
 719 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
 720    non-forking, non-threaded model which allows us to handle many
 721    simultaneous connections while remaining impervious to many denial of
 722    service attacks. */
 723
 724 static void process_loop(void)
 725 {
 726         struct winbindd_cli_state *state;
 727         struct fd_event *ev;
 728         fd_set r_fds, w_fds;
 729         int maxfd, listen_sock, listen_priv_sock, selret;
 730         struct timeval timeout;
 731
 732         /* We'll be doing this a lot */
 733
 734         /* Handle messages */
 735
 736         message_dispatch();
 737
 738         /* refresh the trusted domain cache */
 739
 740         rescan_trusted_domains();
 741
 742         /* Free up temporary memory */
 743
 744         lp_talloc_free();
 745         main_loop_talloc_free();
 746
 747         /* Initialise fd lists for select() */
 748
 749         listen_sock = open_winbindd_socket();
 750         listen_priv_sock = open_winbindd_priv_socket();
 751
 752         if (listen_sock == -1 || listen_priv_sock == -1) {
 753                 perror("open_winbind_socket");
 754                 exit(1);
 755         }
 756
 757         maxfd = MAX(listen_sock, listen_priv_sock);
 758
 759         FD_ZERO(&r_fds);
 760         FD_ZERO(&w_fds);
 761         FD_SET(listen_sock, &r_fds);
 762         FD_SET(listen_priv_sock, &r_fds);
 763
 764         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
 765         timeout.tv_usec = 0;
 766
 767         if (opt_dual_daemon) {
 768                 maxfd = dual_select_setup(&w_fds, maxfd);
 769         }
 770
 771         /* Set up client readers and writers */
 772
 773         state = winbindd_client_list();
 774
 775         while (state) {
 776
 777                 struct winbindd_cli_state *next = state->next;
 778
 779                 /* Dispose of client connection if it is marked as
 780                    finished */
 781
 782                 if (state->finished)
 783                         remove_client(state);
 784
 785                 state = next;
 786         }
 787
 788         for (ev = fd_events; ev; ev = ev->next) {
 789                 if (ev->flags & EVENT_FD_READ) {
 790                         FD_SET(ev->fd, &r_fds);
 791                         maxfd = MAX(ev->fd, maxfd);
 792                 }
 793                 if (ev->flags & EVENT_FD_WRITE) {
 794                         FD_SET(ev->fd, &w_fds);
 795                         maxfd = MAX(ev->fd, maxfd);
 796                 }
 797         }
 798
 799         /* Call select */
 800
 801         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
 802
 803         if (selret == 0)
 804                 goto no_fds_ready;
 805
 806         if ((selret == -1 && errno != EINTR) || selret == 0) {
 807
 808                 /* Select error, something is badly wrong */
 809
 810                 perror("select");
 811                 exit(1);
 812         }
 813
 814         /* Create a new connection if listen_sock readable */
 815
 816         if (opt_dual_daemon) {
 817                 dual_select(&w_fds);
 818         }
 819
 820         ev = fd_events;
 821         while (ev != NULL) {
 822                 struct fd_event *next = ev->next;
 823                 int flags = 0;
 824                 if (FD_ISSET(ev->fd, &r_fds))
 825                         flags |= EVENT_FD_READ;
 826                 if (FD_ISSET(ev->fd, &w_fds))
 827                         flags |= EVENT_FD_WRITE;
 828                 if (flags)
 829                         ev->handler(ev, flags);
 830                 ev = next;
 831         }
 832
 833         if (FD_ISSET(listen_sock, &r_fds)) {
 834                 while (winbindd_num_clients() >
 835                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 836                         DEBUG(5,("winbindd: Exceeding %d client "
 837                                  "connections, removing idle "
 838                                  "connection.\n",
 839                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 840                         if (!remove_idle_client()) {
 841                                 DEBUG(0,("winbindd: Exceeding %d "
 842                                          "client connections, no idle "
 843                                          "connection found\n",
 844                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 845                                 break;
 846                         }
 847                 }
 848                 /* new, non-privileged connection */
 849                 new_connection(listen_sock, False);
 850         }
 851
 852         if (FD_ISSET(listen_priv_sock, &r_fds)) {
 853                 while (winbindd_num_clients() >
 854                        WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 855                         DEBUG(5,("winbindd: Exceeding %d client "
 856                                  "connections, removing idle "
 857                                  "connection.\n",
 858                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 859                         if (!remove_idle_client()) {
 860                                 DEBUG(0,("winbindd: Exceeding %d "
 861                                          "client connections, no idle "
 862                                          "connection found\n",
 863                                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 864                                 break;
 865                         }
 866                 }
 867                 /* new, privileged connection */
 868                 new_connection(listen_priv_sock, True);
 869         }
 870
 871  no_fds_ready:
 872
 873 #if 0
 874         winbindd_check_cache_size(time(NULL));
 875 #endif
 876
 877         /* Check signal handling things */
 878
 879         if (do_sigterm)
 880                 terminate();
 881
 882         if (do_sighup) {
 883
 884                 DEBUG(3, ("got SIGHUP\n"));
 885
 886                 msg_reload_services(MSG_SMB_CONF_UPDATED, (pid_t) 0, NULL, 0);
 887                 do_sighup = False;
 888         }
 889
 890         if (do_sigusr2) {
 891                 print_winbindd_status();
 892                 do_sigusr2 = False;
 893         }
 894
 895         if (do_sigchld) {
 896                 pid_t pid;
 897
 898                 do_sigchld = False;
 899
 900                 while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 901                         winbind_child_died(pid);
 902                 }
 903         }
 904 }
 905
 906 /* Main function */
 907
 908 struct winbindd_state server_state;   /* Server state information */
 909
 910 int main(int argc, char **argv)
 911 {
 912         pstring logfile;
 913         static BOOL Fork = True;
 914         static BOOL log_stdout = False;
 915         struct poptOption long_options[] = {
 916                 POPT_AUTOHELP
 917                 { "stdout", 'S', POPT_ARG_VAL, &log_stdout, True, "Log to stdout" },
 918                 { "foreground", 'F', POPT_ARG_VAL, &Fork, False, "Daemon in foreground mode" },
 919                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
 920                 { "single-daemon", 'Y', POPT_ARG_VAL, &opt_dual_daemon, False, "Single daemon mode" },
 921                 { "no-caching", 'n', POPT_ARG_VAL, &opt_nocache, True, "Disable caching" },
 922                 POPT_COMMON_SAMBA
 923                 POPT_TABLEEND
 924         };
 925         poptContext pc;
 926         int opt;
 927
 928         /* glibc (?) likes to print "User defined signal 1" and exit if a
 929            SIGUSR[12] is received before a handler is installed */
 930
 931         CatchSignal(SIGUSR1, SIG_IGN);
 932         CatchSignal(SIGUSR2, SIG_IGN);
 933
 934         fault_setup((void (*)(void *))fault_quit );
 935
 936         /* Initialise for running in non-root mode */
 937
 938         sec_init();
 939
 940         set_remote_machine_name("winbindd", False);
 941
 942         /* Set environment variable so we don't recursively call ourselves.
 943            This may also be useful interactively. */
 944
 945         setenv(WINBINDD_DONT_ENV, "1", 1);
 946
 947         /* Initialise samba/rpc client stuff */
 948
 949         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options,
 950                                                 POPT_CONTEXT_KEEP_FIRST);
 951
 952         while ((opt = poptGetNextOpt(pc)) != -1) {
 953                 switch (opt) {
 954                         /* Don't become a daemon */
 955                 case 'i':
 956                         interactive = True;
 957                         log_stdout = True;
 958                         Fork = False;
 959                         break;
 960                 }
 961         }
 962
 963
 964         if (log_stdout && Fork) {
 965                 printf("Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n");
 966                 poptPrintUsage(pc, stderr, 0);
 967                 exit(1);
 968         }
 969
 970         if (!override_logfile) {
 971                 pstr_sprintf(logfile, "%s/log.winbindd", dyn_LOGFILEBASE);
 972                 lp_set_logfile(logfile);
 973         }
 974         setup_logging("winbindd", log_stdout);
 975         reopen_logs();
 976
 977         DEBUG(1, ("winbindd version %s started.\n", SAMBA_VERSION_STRING) );
 978         DEBUGADD( 1, ( "Copyright The Samba Team 2000-2004\n" ) );
 979
 980         if (!reload_services_file()) {
 981                 DEBUG(0, ("error opening config file\n"));
 982                 exit(1);
 983         }
 984
 985         /* Setup names. */
 986
 987         if (!init_names())
 988                 exit(1);
 989
 990         load_interfaces();
 991
 992         if (!secrets_init()) {
 993
 994                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
 995                 return False;
 996         }
 997
 998         /* Enable netbios namecache */
 999
1000         namecache_enable();
1001
1002         /* Check winbindd parameters are valid */
1003
1004         ZERO_STRUCT(server_state);
1005
1006         /* Winbind daemon initialisation */
1007
1008         if ( (!winbindd_param_init()) || (!winbindd_upgrade_idmap()) ||
1009              (!idmap_init(lp_idmap_backend())) ) {
1010                 DEBUG(1, ("Could not init idmap -- netlogon proxy only\n"));
1011                 idmap_set_proxyonly();
1012         }
1013
1014         /* Unblock all signals we are interested in as they may have been
1015            blocked by the parent process. */
1016
1017         BlockSignals(False, SIGINT);
1018         BlockSignals(False, SIGQUIT);
1019         BlockSignals(False, SIGTERM);
1020         BlockSignals(False, SIGUSR1);
1021         BlockSignals(False, SIGUSR2);
1022         BlockSignals(False, SIGHUP);
1023         BlockSignals(False, SIGCHLD);
1024
1025         /* Setup signal handlers */
1026
1027         CatchSignal(SIGINT, termination_handler);      /* Exit on these sigs */
1028         CatchSignal(SIGQUIT, termination_handler);
1029         CatchSignal(SIGTERM, termination_handler);
1030         CatchSignal(SIGCHLD, sigchld_handler);
1031
1032         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1033
1034         CatchSignal(SIGUSR2, sigusr2_handler);         /* Debugging sigs */
1035         CatchSignal(SIGHUP, sighup_handler);
1036
1037         if (!interactive)
1038                 become_daemon(Fork);
1039
1040         pidfile_create("winbindd");
1041
1042 #if HAVE_SETPGID
1043         /*
1044          * If we're interactive we want to set our own process group for
1045          * signal management.
1046          */
1047         if (interactive)
1048                 setpgid( (pid_t)0, (pid_t)0);
1049 #endif
1050
1051         if (opt_dual_daemon) {
1052                 do_dual_daemon();
1053         }
1054
1055         /* Initialise messaging system */
1056
1057         if (!message_init()) {
1058                 DEBUG(0, ("unable to initialise messaging system\n"));
1059                 exit(1);
1060         }
1061
1062         /* React on 'smbcontrol winbindd reload-config' in the same way
1063            as to SIGHUP signal */
1064         message_register(MSG_SMB_CONF_UPDATED, msg_reload_services);
1065         message_register(MSG_SHUTDOWN, msg_shutdown);
1066
1067         poptFreeContext(pc);
1068
1069         netsamlogon_cache_init(); /* Non-critical */
1070
1071         init_domain_list();
1072
1073         init_idmap_child();
1074
1075         /* Loop waiting for requests */
1076
1077         while (1)
1078                 process_loop();
1079
1080         trustdom_cache_shutdown();
1081
1082         return 0;
1083 }