source3/winbindd/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 3 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, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_WINBIND
  30
  31 static bool opt_nocache = False;
  32 static bool interactive = False;
  33
  34 extern bool override_logfile;
  35
  36 struct event_context *winbind_event_context(void)
  37 {
  38         static struct event_context *ctx;
  39
  40         if (!ctx && !(ctx = event_context_init(NULL))) {
  41                 smb_panic("Could not init winbind event context");
  42         }
  43         return ctx;
  44 }
  45
  46 struct messaging_context *winbind_messaging_context(void)
  47 {
  48         static struct messaging_context *ctx;
  49
  50         if (ctx == NULL) {
  51                 ctx = messaging_init(NULL, server_id_self(),
  52                                      winbind_event_context());
  53         }
  54         if (ctx == NULL) {
  55                 DEBUG(0, ("Could not init winbind messaging context.\n"));
  56         }
  57         return ctx;
  58 }
  59
  60 /* Reload configuration */
  61
  62 static bool reload_services_file(const char *lfile)
  63 {
  64         bool ret;
  65
  66         if (lp_loaded()) {
  67                 const char *fname = lp_configfile();
  68
  69                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  70                         set_dyn_CONFIGFILE(fname);
  71                 }
  72         }
  73
  74         /* if this is a child, restore the logfile to the special
  75            name - <domain>, idmap, etc. */
  76         if (lfile && *lfile) {
  77                 lp_set_logfile(lfile);
  78         }
  79
  80         reopen_logs();
  81         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  82
  83         reopen_logs();
  84         load_interfaces();
  85
  86         return(ret);
  87 }
  88
  89
  90 /**************************************************************************** **
  91  Handle a fault..
  92  **************************************************************************** */
  93
  94 static void fault_quit(void)
  95 {
  96         dump_core();
  97 }
  98
  99 static void winbindd_status(void)
 100 {
 101         struct winbindd_cli_state *tmp;
 102
 103         DEBUG(0, ("winbindd status:\n"));
 104
 105         /* Print client state information */
 106
 107         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 108
 109         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 110                 DEBUG(2, ("\tclient list:\n"));
 111                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 112                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 113                                   (unsigned long)tmp->pid, tmp->sock));
 114                 }
 115         }
 116 }
 117
 118 /* Print winbindd status to log file */
 119
 120 static void print_winbindd_status(void)
 121 {
 122         winbindd_status();
 123 }
 124
 125 /* Flush client cache */
 126
 127 static void flush_caches(void)
 128 {
 129         /* We need to invalidate cached user list entries on a SIGHUP
 130            otherwise cached access denied errors due to restrict anonymous
 131            hang around until the sequence number changes. */
 132
 133         if (!wcache_invalidate_cache()) {
 134                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 135                 if (!winbindd_cache_validate_and_initialize()) {
 136                         exit(1);
 137                 }
 138         }
 139 }
 140
 141 /* Handle the signal by unlinking socket and exiting */
 142
 143 static void terminate(bool is_parent)
 144 {
 145         if (is_parent) {
 146                 /* When parent goes away we should
 147                  * remove the socket file. Not so
 148                  * when children terminate.
 149                  */
 150                 char *path = NULL;
 151
 152                 if (asprintf(&path, "%s/%s",
 153                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 154                         unlink(path);
 155                         SAFE_FREE(path);
 156                 }
 157         }
 158
 159         idmap_close();
 160
 161         trustdom_cache_shutdown();
 162
 163         gencache_stabilize();
 164
 165 #if 0
 166         if (interactive) {
 167                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 168                 char *description = talloc_describe_all(mem_ctx);
 169
 170                 DEBUG(3, ("tallocs left:\n%s\n", description));
 171                 talloc_destroy(mem_ctx);
 172         }
 173 #endif
 174
 175         if (is_parent) {
 176                 pidfile_unlink();
 177         }
 178
 179         exit(0);
 180 }
 181
 182 static void winbindd_sig_term_handler(struct tevent_context *ev,
 183                                       struct tevent_signal *se,
 184                                       int signum,
 185                                       int count,
 186                                       void *siginfo,
 187                                       void *private_data)
 188 {
 189         bool *is_parent = talloc_get_type_abort(private_data, bool);
 190
 191         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 192                  signum, (int)*is_parent));
 193
 194         /* if the parent killed us due to a timeout log where we were */
 195         if (signum == SIGXCPU) {
 196                 log_stack_trace_with_level(1);
 197         }
 198
 199         terminate(*is_parent);
 200 }
 201
 202 bool winbindd_setup_sig_term_handler(bool parent)
 203 {
 204         struct tevent_signal *se;
 205         bool *is_parent;
 206
 207         is_parent = talloc(winbind_event_context(), bool);
 208         if (!is_parent) {
 209                 return false;
 210         }
 211
 212         *is_parent = parent;
 213
 214         se = tevent_add_signal(winbind_event_context(),
 215                                is_parent,
 216                                SIGTERM, 0,
 217                                winbindd_sig_term_handler,
 218                                is_parent);
 219         if (!se) {
 220                 DEBUG(0,("failed to setup SIGTERM handler"));
 221                 talloc_free(is_parent);
 222                 return false;
 223         }
 224
 225         se = tevent_add_signal(winbind_event_context(),
 226                                is_parent,
 227                                SIGINT, 0,
 228                                winbindd_sig_term_handler,
 229                                is_parent);
 230         if (!se) {
 231                 DEBUG(0,("failed to setup SIGINT handler"));
 232                 talloc_free(is_parent);
 233                 return false;
 234         }
 235
 236         se = tevent_add_signal(winbind_event_context(),
 237                                is_parent,
 238                                SIGQUIT, 0,
 239                                winbindd_sig_term_handler,
 240                                is_parent);
 241         if (!se) {
 242                 DEBUG(0,("failed to setup SIGINT handler"));
 243                 talloc_free(is_parent);
 244                 return false;
 245         }
 246
 247         se = tevent_add_signal(winbind_event_context(),
 248                                is_parent,
 249                                SIGXCPU, 0,
 250                                winbindd_sig_term_handler,
 251                                is_parent);
 252         if (!se) {
 253                 DEBUG(0,("failed to setup SIGXCPU handler"));
 254                 talloc_free(is_parent);
 255                 return false;
 256         }
 257         return true;
 258 }
 259
 260 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 261                                      struct tevent_signal *se,
 262                                      int signum,
 263                                      int count,
 264                                      void *siginfo,
 265                                      void *private_data)
 266 {
 267         const char *file = (const char *)private_data;
 268
 269         DEBUG(1,("Reloading services after SIGHUP\n"));
 270         flush_caches();
 271         reload_services_file(file);
 272 }
 273
 274 bool winbindd_setup_sig_hup_handler(const char *lfile)
 275 {
 276         struct tevent_signal *se;
 277         char *file = NULL;
 278
 279         if (lfile) {
 280                 file = talloc_strdup(winbind_event_context(),
 281                                      lfile);
 282                 if (!file) {
 283                         return false;
 284                 }
 285         }
 286
 287         se = tevent_add_signal(winbind_event_context(),
 288                                winbind_event_context(),
 289                                SIGHUP, 0,
 290                                winbindd_sig_hup_handler,
 291                                file);
 292         if (!se) {
 293                 return false;
 294         }
 295
 296         return true;
 297 }
 298
 299 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 300                                       struct tevent_signal *se,
 301                                       int signum,
 302                                       int count,
 303                                       void *siginfo,
 304                                       void *private_data)
 305 {
 306         pid_t pid;
 307
 308         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 309                 winbind_child_died(pid);
 310         }
 311 }
 312
 313 static bool winbindd_setup_sig_chld_handler(void)
 314 {
 315         struct tevent_signal *se;
 316
 317         se = tevent_add_signal(winbind_event_context(),
 318                                winbind_event_context(),
 319                                SIGCHLD, 0,
 320                                winbindd_sig_chld_handler,
 321                                NULL);
 322         if (!se) {
 323                 return false;
 324         }
 325
 326         return true;
 327 }
 328
 329 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 330                                       struct tevent_signal *se,
 331                                       int signum,
 332                                       int count,
 333                                       void *siginfo,
 334                                       void *private_data)
 335 {
 336         print_winbindd_status();
 337 }
 338
 339 static bool winbindd_setup_sig_usr2_handler(void)
 340 {
 341         struct tevent_signal *se;
 342
 343         se = tevent_add_signal(winbind_event_context(),
 344                                winbind_event_context(),
 345                                SIGUSR2, 0,
 346                                winbindd_sig_usr2_handler,
 347                                NULL);
 348         if (!se) {
 349                 return false;
 350         }
 351
 352         return true;
 353 }
 354
 355 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 356 static void msg_reload_services(struct messaging_context *msg,
 357                                 void *private_data,
 358                                 uint32_t msg_type,
 359                                 struct server_id server_id,
 360                                 DATA_BLOB *data)
 361 {
 362         /* Flush various caches */
 363         flush_caches();
 364         reload_services_file((const char *) private_data);
 365 }
 366
 367 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 368 static void msg_shutdown(struct messaging_context *msg,
 369                          void *private_data,
 370                          uint32_t msg_type,
 371                          struct server_id server_id,
 372                          DATA_BLOB *data)
 373 {
 374         /* only the parent waits for this message */
 375         DEBUG(0,("Got shutdown message\n"));
 376         terminate(true);
 377 }
 378
 379
 380 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 381                                        void *private_data,
 382                                        uint32_t msg_type,
 383                                        struct server_id server_id,
 384                                        DATA_BLOB *data)
 385 {
 386         uint8 ret;
 387         pid_t child_pid;
 388
 389         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 390                    "message.\n"));
 391
 392         /*
 393          * call the validation code from a child:
 394          * so we don't block the main winbindd and the validation
 395          * code can safely use fork/waitpid...
 396          */
 397         child_pid = sys_fork();
 398
 399         if (child_pid == -1) {
 400                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 401                           strerror(errno)));
 402                 return;
 403         }
 404
 405         if (child_pid != 0) {
 406                 /* parent */
 407                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 408                           "pid %d.\n", (int)child_pid));
 409                 return;
 410         }
 411
 412         /* child */
 413
 414         if (!winbindd_reinit_after_fork(NULL)) {
 415                 _exit(0);
 416         }
 417
 418         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 419         CatchSignal(SIGCHLD, SIG_DFL);
 420
 421         ret = (uint8)winbindd_validate_cache_nobackup();
 422         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 423         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 424                            (size_t)1);
 425         _exit(0);
 426 }
 427
 428 static struct winbindd_dispatch_table {
 429         enum winbindd_cmd cmd;
 430         void (*fn)(struct winbindd_cli_state *state);
 431         const char *winbindd_cmd_name;
 432 } dispatch_table[] = {
 433
 434         /* User functions */
 435
 436         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 437         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 438         { WINBINDD_GETPWSID, winbindd_getpwsid, "GETPWSID" },
 439
 440         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 441         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 442         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 443
 444         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 445         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 446         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 447           "GETUSERDOMGROUPS" },
 448         { WINBINDD_GETSIDALIASES, winbindd_getsidaliases,
 449            "LOOKUPUSERALIASES" },
 450
 451         /* Group functions */
 452
 453         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 454         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 455         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 456         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 457         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 458         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 459
 460         /* PAM auth functions */
 461
 462         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 463         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 464         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 465         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 466         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 467
 468         /* Enumeration functions */
 469
 470         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 471         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 472         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 473           "LIST_TRUSTDOM" },
 474         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 475
 476         /* SID related functions */
 477
 478         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 479         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 480         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 481
 482         /* Lookup related functions */
 483
 484         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 485         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 486         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 487         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 488         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 489         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 490
 491         /* Miscellaneous */
 492
 493         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 494         { WINBINDD_PING_DC, winbindd_ping_dc, "PING_DC" },
 495         { WINBINDD_PING, winbindd_ping, "PING" },
 496         { WINBINDD_INFO, winbindd_info, "INFO" },
 497         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 498           "INTERFACE_VERSION" },
 499         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 500         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 501         { WINBINDD_DC_INFO, winbindd_dc_info, "DC_INFO" },
 502         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 503         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 504           "WINBINDD_PRIV_PIPE_DIR" },
 505         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 506         { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
 507
 508         /* Credential cache access */
 509         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 510
 511         /* WINS functions */
 512
 513         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 514         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 515
 516         /* End of list */
 517
 518         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 519 };
 520
 521 static void process_request(struct winbindd_cli_state *state)
 522 {
 523         struct winbindd_dispatch_table *table = dispatch_table;
 524
 525         /* Free response data - we may be interrupted and receive another
 526            command before being able to send this data off. */
 527
 528         SAFE_FREE(state->response.extra_data.data);
 529
 530         ZERO_STRUCT(state->response);
 531
 532         state->response.result = WINBINDD_PENDING;
 533         state->response.length = sizeof(struct winbindd_response);
 534
 535         state->mem_ctx = talloc_init("winbind request");
 536         if (state->mem_ctx == NULL)
 537                 return;
 538
 539         /* Remember who asked us. */
 540         state->pid = state->request.pid;
 541
 542         /* Process command */
 543
 544         for (table = dispatch_table; table->fn; table++) {
 545                 if (state->request.cmd == table->cmd) {
 546                         DEBUG(10,("process_request: request fn %s\n",
 547                                   table->winbindd_cmd_name ));
 548                         table->fn(state);
 549                         break;
 550                 }
 551         }
 552
 553         if (!table->fn) {
 554                 DEBUG(10,("process_request: unknown request fn number %d\n",
 555                           (int)state->request.cmd ));
 556                 request_error(state);
 557         }
 558 }
 559
 560 /*
 561  * A list of file descriptors being monitored by select in the main processing
 562  * loop. winbindd_fd_event->handler is called whenever the socket is readable/writable.
 563  */
 564
 565 static struct winbindd_fd_event *fd_events = NULL;
 566
 567 void add_fd_event(struct winbindd_fd_event *ev)
 568 {
 569         struct winbindd_fd_event *match;
 570
 571         /* only add unique winbindd_fd_event structs */
 572
 573         for (match=fd_events; match; match=match->next ) {
 574 #ifdef DEVELOPER
 575                 SMB_ASSERT( match != ev );
 576 #else
 577                 if ( match == ev )
 578                         return;
 579 #endif
 580         }
 581
 582         DLIST_ADD(fd_events, ev);
 583 }
 584
 585 void remove_fd_event(struct winbindd_fd_event *ev)
 586 {
 587         DLIST_REMOVE(fd_events, ev);
 588 }
 589
 590 /*
 591  * Handler for winbindd_fd_events to complete a read/write request, set up by
 592  * setup_async_read/setup_async_write.
 593  */
 594
 595 static void rw_callback(struct winbindd_fd_event *event, int flags)
 596 {
 597         size_t todo;
 598         ssize_t done = 0;
 599
 600         todo = event->length - event->done;
 601
 602         if (event->flags & EVENT_FD_WRITE) {
 603                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 604                 done = sys_write(event->fd,
 605                                  &((char *)event->data)[event->done],
 606                                  todo);
 607
 608                 if (done <= 0) {
 609                         event->flags = 0;
 610                         event->finished(event->private_data, False);
 611                         return;
 612                 }
 613         }
 614
 615         if (event->flags & EVENT_FD_READ) {
 616                 SMB_ASSERT(flags == EVENT_FD_READ);
 617                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 618                                 todo);
 619
 620                 if (done <= 0) {
 621                         event->flags = 0;
 622                         event->finished(event->private_data, False);
 623                         return;
 624                 }
 625         }
 626
 627         event->done += done;
 628
 629         if (event->done == event->length) {
 630                 event->flags = 0;
 631                 event->finished(event->private_data, True);
 632         }
 633 }
 634
 635 /*
 636  * Request an async read/write on a winbindd_fd_event structure. (*finished) is called
 637  * when the request is completed or an error had occurred.
 638  */
 639
 640 void setup_async_read(struct winbindd_fd_event *event, void *data, size_t length,
 641                       void (*finished)(void *private_data, bool success),
 642                       void *private_data)
 643 {
 644         SMB_ASSERT(event->flags == 0);
 645         event->data = data;
 646         event->length = length;
 647         event->done = 0;
 648         event->handler = rw_callback;
 649         event->finished = finished;
 650         event->private_data = private_data;
 651         event->flags = EVENT_FD_READ;
 652 }
 653
 654 void setup_async_write(struct winbindd_fd_event *event, void *data, size_t length,
 655                        void (*finished)(void *private_data, bool success),
 656                        void *private_data)
 657 {
 658         SMB_ASSERT(event->flags == 0);
 659         event->data = data;
 660         event->length = length;
 661         event->done = 0;
 662         event->handler = rw_callback;
 663         event->finished = finished;
 664         event->private_data = private_data;
 665         event->flags = EVENT_FD_WRITE;
 666 }
 667
 668 /*
 669  * This is the main event loop of winbind requests. It goes through a
 670  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 671  *
 672  * An idle winbind client has a read request of 4 bytes outstanding,
 673  * finalizing function is request_len_recv, checking the length. request_recv
 674  * then processes the packet. The processing function then at some point has
 675  * to call request_finished which schedules sending the response.
 676  */
 677
 678 static void request_len_recv(void *private_data, bool success);
 679 static void request_recv(void *private_data, bool success);
 680 static void request_main_recv(void *private_data, bool success);
 681 static void request_finished(struct winbindd_cli_state *state);
 682 static void response_main_sent(void *private_data, bool success);
 683 static void response_extra_sent(void *private_data, bool success);
 684
 685 static void response_extra_sent(void *private_data, bool success)
 686 {
 687         struct winbindd_cli_state *state =
 688                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 689
 690         TALLOC_FREE(state->mem_ctx);
 691
 692         if (!success) {
 693                 state->finished = True;
 694                 return;
 695         }
 696
 697         SAFE_FREE(state->response.extra_data.data);
 698
 699         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 700                          request_len_recv, state);
 701 }
 702
 703 static void response_main_sent(void *private_data, bool success)
 704 {
 705         struct winbindd_cli_state *state =
 706                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 707
 708         if (!success) {
 709                 state->finished = True;
 710                 return;
 711         }
 712
 713         if (state->response.length == sizeof(state->response)) {
 714                 TALLOC_FREE(state->mem_ctx);
 715
 716                 setup_async_read(&state->fd_event, &state->request,
 717                                  sizeof(uint32), request_len_recv, state);
 718                 return;
 719         }
 720
 721         setup_async_write(&state->fd_event, state->response.extra_data.data,
 722                           state->response.length - sizeof(state->response),
 723                           response_extra_sent, state);
 724 }
 725
 726 static void request_finished(struct winbindd_cli_state *state)
 727 {
 728         /* Make sure request.extra_data is freed when finish processing a request */
 729         SAFE_FREE(state->request.extra_data.data);
 730         setup_async_write(&state->fd_event, &state->response,
 731                           sizeof(state->response), response_main_sent, state);
 732 }
 733
 734 void request_error(struct winbindd_cli_state *state)
 735 {
 736         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 737         state->response.result = WINBINDD_ERROR;
 738         request_finished(state);
 739 }
 740
 741 void request_ok(struct winbindd_cli_state *state)
 742 {
 743         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 744         state->response.result = WINBINDD_OK;
 745         request_finished(state);
 746 }
 747
 748 static void request_len_recv(void *private_data, bool success)
 749 {
 750         struct winbindd_cli_state *state =
 751                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 752
 753         if (!success) {
 754                 state->finished = True;
 755                 return;
 756         }
 757
 758         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 759                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
 760                          *(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
 761                 state->finished = True;
 762                 return;
 763         }
 764
 765         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 766                          sizeof(state->request) - sizeof(uint32),
 767                          request_main_recv, state);
 768 }
 769
 770 static void request_main_recv(void *private_data, bool success)
 771 {
 772         struct winbindd_cli_state *state =
 773                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 774
 775         if (!success) {
 776                 state->finished = True;
 777                 return;
 778         }
 779
 780         if (state->request.extra_len == 0) {
 781                 state->request.extra_data.data = NULL;
 782                 request_recv(state, True);
 783                 return;
 784         }
 785
 786         if ((!state->privileged) &&
 787             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 788                 DEBUG(3, ("Got request with %d bytes extra data on "
 789                           "unprivileged socket\n", (int)state->request.extra_len));
 790                 state->request.extra_data.data = NULL;
 791                 state->finished = True;
 792                 return;
 793         }
 794
 795         state->request.extra_data.data =
 796                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 797
 798         if (state->request.extra_data.data == NULL) {
 799                 DEBUG(0, ("malloc failed\n"));
 800                 state->finished = True;
 801                 return;
 802         }
 803
 804         /* Ensure null termination */
 805         state->request.extra_data.data[state->request.extra_len] = '\0';
 806
 807         setup_async_read(&state->fd_event, state->request.extra_data.data,
 808                          state->request.extra_len, request_recv, state);
 809 }
 810
 811 static void request_recv(void *private_data, bool success)
 812 {
 813         struct winbindd_cli_state *state =
 814                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 815
 816         if (!success) {
 817                 state->finished = True;
 818                 return;
 819         }
 820
 821         process_request(state);
 822 }
 823
 824 /* Process a new connection by adding it to the client connection list */
 825
 826 static void new_connection(int listen_sock, bool privileged)
 827 {
 828         struct sockaddr_un sunaddr;
 829         struct winbindd_cli_state *state;
 830         socklen_t len;
 831         int sock;
 832
 833         /* Accept connection */
 834
 835         len = sizeof(sunaddr);
 836
 837         do {
 838                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 839         } while (sock == -1 && errno == EINTR);
 840
 841         if (sock == -1)
 842                 return;
 843
 844         DEBUG(6,("accepted socket %d\n", sock));
 845
 846         /* Create new connection structure */
 847
 848         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 849                 close(sock);
 850                 return;
 851         }
 852
 853         state->sock = sock;
 854
 855         state->last_access = time(NULL);
 856
 857         state->privileged = privileged;
 858
 859         state->fd_event.fd = state->sock;
 860         state->fd_event.flags = 0;
 861         add_fd_event(&state->fd_event);
 862
 863         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 864                          request_len_recv, state);
 865
 866         /* Add to connection list */
 867
 868         winbindd_add_client(state);
 869 }
 870
 871 /* Remove a client connection from client connection list */
 872
 873 static void remove_client(struct winbindd_cli_state *state)
 874 {
 875         char c = 0;
 876         int nwritten;
 877
 878         /* It's a dead client - hold a funeral */
 879
 880         if (state == NULL) {
 881                 return;
 882         }
 883
 884         if (!state->finished) {
 885                 /* tell client, we are closing ... */
 886                 nwritten = write(state->sock, &c, sizeof(c));
 887                 if (nwritten == -1) {
 888                         DEBUG(2, ("final write to client failed: %s\n",
 889                                   strerror(errno)));
 890                 }
 891         }
 892
 893         /* Close socket */
 894
 895         close(state->sock);
 896
 897         /* Free any getent state */
 898
 899         free_getent_state(state->getpwent_state);
 900         free_getent_state(state->getgrent_state);
 901
 902         /* We may have some extra data that was not freed if the client was
 903            killed unexpectedly */
 904
 905         SAFE_FREE(state->response.extra_data.data);
 906
 907         TALLOC_FREE(state->mem_ctx);
 908
 909         remove_fd_event(&state->fd_event);
 910
 911         /* Remove from list and free */
 912
 913         winbindd_remove_client(state);
 914         TALLOC_FREE(state);
 915 }
 916
 917 /* Shutdown client connection which has been idle for the longest time */
 918
 919 static bool remove_idle_client(void)
 920 {
 921         struct winbindd_cli_state *state, *remove_state = NULL;
 922         time_t last_access = 0;
 923         int nidle = 0;
 924
 925         for (state = winbindd_client_list(); state; state = state->next) {
 926                 if (state->response.result != WINBINDD_PENDING &&
 927                     state->fd_event.flags == EVENT_FD_READ &&
 928                     !state->getpwent_state && !state->getgrent_state) {
 929                         nidle++;
 930                         if (!last_access || state->last_access < last_access) {
 931                                 last_access = state->last_access;
 932                                 remove_state = state;
 933                         }
 934                 }
 935         }
 936
 937         if (remove_state) {
 938                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 939                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 940                 remove_client(remove_state);
 941                 return True;
 942         }
 943
 944         return False;
 945 }
 946
 947 struct winbindd_listen_state {
 948         bool privileged;
 949         int fd;
 950         struct tevent_fd *fde;
 951 };
 952
 953 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 954                                         struct tevent_fd *fde,
 955                                         uint16_t flags,
 956                                         void *private_data)
 957 {
 958         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 959                                           struct winbindd_listen_state);
 960
 961         while (winbindd_num_clients() >
 962                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 963                 DEBUG(5,("winbindd: Exceeding %d client "
 964                          "connections, removing idle "
 965                          "connection.\n",
 966                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 967                 if (!remove_idle_client()) {
 968                         DEBUG(0,("winbindd: Exceeding %d "
 969                                  "client connections, no idle "
 970                                  "connection found\n",
 971                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 972                         break;
 973                 }
 974         }
 975
 976         /* new, non-privileged connection */
 977         new_connection(s->fd, s->privileged);
 978 }
 979
 980 static bool winbindd_setup_listeners(void)
 981 {
 982         struct winbindd_listen_state *pub_state = NULL;
 983         struct winbindd_listen_state *priv_state = NULL;
 984
 985         pub_state = talloc(winbind_event_context(),
 986                            struct winbindd_listen_state);
 987         if (!pub_state) {
 988                 goto failed;
 989         }
 990
 991         pub_state->privileged = false;
 992         pub_state->fd = open_winbindd_socket();
 993         if (pub_state->fd == -1) {
 994                 goto failed;
 995         }
 996
 997         pub_state->fde = tevent_add_fd(winbind_event_context(),
 998                                        pub_state, pub_state->fd,
 999                                        TEVENT_FD_READ,
1000                                        winbindd_listen_fde_handler,
1001                                        pub_state);
1002         if (!pub_state->fde) {
1003                 close(pub_state->fd);
1004                 goto failed;
1005         }
1006         tevent_fd_set_auto_close(pub_state->fde);
1007
1008         priv_state = talloc(winbind_event_context(),
1009                             struct winbindd_listen_state);
1010         if (!priv_state) {
1011                 goto failed;
1012         }
1013
1014         priv_state->privileged = true;
1015         priv_state->fd = open_winbindd_priv_socket();
1016         if (priv_state->fd == -1) {
1017                 goto failed;
1018         }
1019
1020         priv_state->fde = tevent_add_fd(winbind_event_context(),
1021                                         priv_state, priv_state->fd,
1022                                         TEVENT_FD_READ,
1023                                         winbindd_listen_fde_handler,
1024                                         priv_state);
1025         if (!priv_state->fde) {
1026                 close(priv_state->fd);
1027                 goto failed;
1028         }
1029         tevent_fd_set_auto_close(priv_state->fde);
1030
1031         return true;
1032 failed:
1033         TALLOC_FREE(pub_state);
1034         TALLOC_FREE(priv_state);
1035         return false;
1036 }
1037
1038 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
1039    non-forking, non-threaded model which allows us to handle many
1040    simultaneous connections while remaining impervious to many denial of
1041    service attacks. */
1042
1043 static void process_loop(void)
1044 {
1045         struct winbindd_fd_event *ev;
1046         fd_set r_fds, w_fds;
1047         int maxfd = 0, selret;
1048         struct timeval timeout, ev_timeout;
1049
1050         if (run_events(winbind_event_context(), 0, NULL, NULL)) {
1051                 return;
1052         }
1053
1054         /* Initialise fd lists for select() */
1055
1056         FD_ZERO(&r_fds);
1057         FD_ZERO(&w_fds);
1058
1059         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
1060         timeout.tv_usec = 0;
1061
1062         /* Check for any event timeouts. */
1063         {
1064                 struct timeval now;
1065                 GetTimeOfDay(&now);
1066
1067                 event_add_to_select_args(winbind_event_context(), &now,
1068                                          &r_fds, &w_fds, &ev_timeout, &maxfd);
1069         }
1070         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
1071                 timeout = timeval_min(&timeout, &ev_timeout);
1072         }
1073
1074         for (ev = fd_events; ev; ev = ev->next) {
1075                 if (ev->flags & EVENT_FD_READ) {
1076                         FD_SET(ev->fd, &r_fds);
1077                         maxfd = MAX(ev->fd, maxfd);
1078                 }
1079                 if (ev->flags & EVENT_FD_WRITE) {
1080                         FD_SET(ev->fd, &w_fds);
1081                         maxfd = MAX(ev->fd, maxfd);
1082                 }
1083         }
1084
1085         /* Call select */
1086
1087         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
1088
1089         if (selret == 0) {
1090                 goto no_fds_ready;
1091         }
1092
1093         if (selret == -1) {
1094                 if (errno == EINTR) {
1095                         goto no_fds_ready;
1096                 }
1097
1098                 /* Select error, something is badly wrong */
1099
1100                 perror("select");
1101                 exit(1);
1102         }
1103
1104         /* selret > 0 */
1105
1106         if (run_events(winbind_event_context(), selret, &r_fds, &w_fds)) {
1107                 return;
1108         }
1109
1110         ev = fd_events;
1111         while (ev != NULL) {
1112                 struct winbindd_fd_event *next = ev->next;
1113                 int flags = 0;
1114                 if (FD_ISSET(ev->fd, &r_fds))
1115                         flags |= EVENT_FD_READ;
1116                 if (FD_ISSET(ev->fd, &w_fds))
1117                         flags |= EVENT_FD_WRITE;
1118                 if (flags) {
1119                         ev->handler(ev, flags);
1120                         return;
1121                 }
1122                 ev = next;
1123         }
1124
1125         return;
1126
1127  no_fds_ready:
1128
1129         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
1130
1131 #if 0
1132         winbindd_check_cache_size(time(NULL));
1133 #endif
1134 }
1135
1136 bool winbindd_use_idmap_cache(void)
1137 {
1138         return !opt_nocache;
1139 }
1140
1141 bool winbindd_use_cache(void)
1142 {
1143         return !opt_nocache;
1144 }
1145
1146 /* Main function */
1147
1148 int main(int argc, char **argv, char **envp)
1149 {
1150         static bool is_daemon = False;
1151         static bool Fork = True;
1152         static bool log_stdout = False;
1153         static bool no_process_group = False;
1154         enum {
1155                 OPT_DAEMON = 1000,
1156                 OPT_FORK,
1157                 OPT_NO_PROCESS_GROUP,
1158                 OPT_LOG_STDOUT
1159         };
1160         struct poptOption long_options[] = {
1161                 POPT_AUTOHELP
1162                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1163                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1164                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1165                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1166                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1167                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1168                 POPT_COMMON_SAMBA
1169                 POPT_TABLEEND
1170         };
1171         poptContext pc;
1172         int opt;
1173         TALLOC_CTX *frame = talloc_stackframe();
1174
1175         /* glibc (?) likes to print "User defined signal 1" and exit if a
1176            SIGUSR[12] is received before a handler is installed */
1177
1178         CatchSignal(SIGUSR1, SIG_IGN);
1179         CatchSignal(SIGUSR2, SIG_IGN);
1180
1181         fault_setup((void (*)(void *))fault_quit );
1182         dump_core_setup("winbindd");
1183
1184         load_case_tables();
1185
1186         /* Initialise for running in non-root mode */
1187
1188         sec_init();
1189
1190         set_remote_machine_name("winbindd", False);
1191
1192         /* Set environment variable so we don't recursively call ourselves.
1193            This may also be useful interactively. */
1194
1195         if ( !winbind_off() ) {
1196                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1197                 exit(1);
1198         }
1199
1200         /* Initialise samba/rpc client stuff */
1201
1202         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1203
1204         while ((opt = poptGetNextOpt(pc)) != -1) {
1205                 switch (opt) {
1206                         /* Don't become a daemon */
1207                 case OPT_DAEMON:
1208                         is_daemon = True;
1209                         break;
1210                 case 'i':
1211                         interactive = True;
1212                         log_stdout = True;
1213                         Fork = False;
1214                         break;
1215                 case OPT_FORK:
1216                         Fork = false;
1217                         break;
1218                 case OPT_NO_PROCESS_GROUP:
1219                         no_process_group = true;
1220                         break;
1221                 case OPT_LOG_STDOUT:
1222                         log_stdout = true;
1223                         break;
1224                 case 'n':
1225                         opt_nocache = true;
1226                         break;
1227                 default:
1228                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1229                                   poptBadOption(pc, 0), poptStrerror(opt));
1230                         poptPrintUsage(pc, stderr, 0);
1231                         exit(1);
1232                 }
1233         }
1234
1235         if (is_daemon && interactive) {
1236                 d_fprintf(stderr,"\nERROR: "
1237                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1238                 poptPrintUsage(pc, stderr, 0);
1239                 exit(1);
1240         }
1241
1242         if (log_stdout && Fork) {
1243                 d_fprintf(stderr, "\nERROR: "
1244                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1245                 poptPrintUsage(pc, stderr, 0);
1246                 exit(1);
1247         }
1248
1249         poptFreeContext(pc);
1250
1251         if (!override_logfile) {
1252                 char *lfile = NULL;
1253                 if (asprintf(&lfile,"%s/log.winbindd",
1254                                 get_dyn_LOGFILEBASE()) > 0) {
1255                         lp_set_logfile(lfile);
1256                         SAFE_FREE(lfile);
1257                 }
1258         }
1259         setup_logging("winbindd", log_stdout);
1260         reopen_logs();
1261
1262         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1263         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1264
1265         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1266                 DEBUG(0, ("error opening config file\n"));
1267                 exit(1);
1268         }
1269
1270         /* Initialise messaging system */
1271
1272         if (winbind_messaging_context() == NULL) {
1273                 exit(1);
1274         }
1275
1276         if (!reload_services_file(NULL)) {
1277                 DEBUG(0, ("error opening config file\n"));
1278                 exit(1);
1279         }
1280
1281         if (!directory_exist(lp_lockdir())) {
1282                 mkdir(lp_lockdir(), 0755);
1283         }
1284
1285         /* Setup names. */
1286
1287         if (!init_names())
1288                 exit(1);
1289
1290         load_interfaces();
1291
1292         if (!secrets_init()) {
1293
1294                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1295                 return False;
1296         }
1297
1298         /* Enable netbios namecache */
1299
1300         namecache_enable();
1301
1302         /* Unblock all signals we are interested in as they may have been
1303            blocked by the parent process. */
1304
1305         BlockSignals(False, SIGINT);
1306         BlockSignals(False, SIGQUIT);
1307         BlockSignals(False, SIGTERM);
1308         BlockSignals(False, SIGUSR1);
1309         BlockSignals(False, SIGUSR2);
1310         BlockSignals(False, SIGHUP);
1311         BlockSignals(False, SIGCHLD);
1312         BlockSignals(False, SIGXCPU);
1313
1314         if (!interactive)
1315                 become_daemon(Fork, no_process_group);
1316
1317         pidfile_create("winbindd");
1318
1319 #if HAVE_SETPGID
1320         /*
1321          * If we're interactive we want to set our own process group for
1322          * signal management.
1323          */
1324         if (interactive && !no_process_group)
1325                 setpgid( (pid_t)0, (pid_t)0);
1326 #endif
1327
1328         TimeInit();
1329
1330         /* Don't use winbindd_reinit_after_fork here as
1331          * we're just starting up and haven't created any
1332          * winbindd-specific resources we must free yet. JRA.
1333          */
1334
1335         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1336                                                winbind_event_context(),
1337                                                false))) {
1338                 DEBUG(0,("reinit_after_fork() failed\n"));
1339                 exit(1);
1340         }
1341
1342         /* Setup signal handlers */
1343
1344         if (!winbindd_setup_sig_term_handler(true))
1345                 exit(1);
1346         if (!winbindd_setup_sig_hup_handler(NULL))
1347                 exit(1);
1348         if (!winbindd_setup_sig_chld_handler())
1349                 exit(1);
1350         if (!winbindd_setup_sig_usr2_handler())
1351                 exit(1);
1352
1353         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1354
1355         /*
1356          * Ensure all cache and idmap caches are consistent
1357          * and initialized before we startup.
1358          */
1359         if (!winbindd_cache_validate_and_initialize()) {
1360                 exit(1);
1361         }
1362
1363         /* get broadcast messages */
1364
1365         if (!serverid_register(procid_self(),
1366                                FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1367                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1368                 exit(1);
1369         }
1370
1371         /* React on 'smbcontrol winbindd reload-config' in the same way
1372            as to SIGHUP signal */
1373         messaging_register(winbind_messaging_context(), NULL,
1374                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1375         messaging_register(winbind_messaging_context(), NULL,
1376                            MSG_SHUTDOWN, msg_shutdown);
1377
1378         /* Handle online/offline messages. */
1379         messaging_register(winbind_messaging_context(), NULL,
1380                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1381         messaging_register(winbind_messaging_context(), NULL,
1382                            MSG_WINBIND_ONLINE, winbind_msg_online);
1383         messaging_register(winbind_messaging_context(), NULL,
1384                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1385
1386         messaging_register(winbind_messaging_context(), NULL,
1387                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1388
1389         messaging_register(winbind_messaging_context(), NULL,
1390                            MSG_WINBIND_VALIDATE_CACHE,
1391                            winbind_msg_validate_cache);
1392
1393         messaging_register(winbind_messaging_context(), NULL,
1394                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1395                            winbind_msg_dump_domain_list);
1396
1397         messaging_register(winbind_messaging_context(), NULL,
1398                            MSG_WINBIND_IP_DROPPED,
1399                            winbind_msg_ip_dropped_parent);
1400
1401         /* Register handler for MSG_DEBUG. */
1402         messaging_register(winbind_messaging_context(), NULL,
1403                            MSG_DEBUG,
1404                            winbind_msg_debug);
1405
1406         netsamlogon_cache_init(); /* Non-critical */
1407
1408         /* clear the cached list of trusted domains */
1409
1410         wcache_tdc_clear();
1411
1412         if (!init_domain_list()) {
1413                 DEBUG(0,("unable to initialize domain list\n"));
1414                 exit(1);
1415         }
1416
1417         init_idmap_child();
1418         init_locator_child();
1419
1420         smb_nscd_flush_user_cache();
1421         smb_nscd_flush_group_cache();
1422
1423         /* setup listen sockets */
1424
1425         if (!winbindd_setup_listeners()) {
1426                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1427                 exit(1);
1428         }
1429
1430         TALLOC_FREE(frame);
1431         /* Loop waiting for requests */
1432         while (1) {
1433                 struct winbindd_cli_state *state;
1434
1435                 frame = talloc_stackframe();
1436
1437                 /* refresh the trusted domain cache */
1438
1439                 rescan_trusted_domains();
1440
1441                 /* Dispose of client connection if it is marked as
1442                    finished */
1443                 state = winbindd_client_list();
1444                 while (state) {
1445                         struct winbindd_cli_state *next = state->next;
1446
1447                         if (state->finished) {
1448                                 remove_client(state);
1449                         }
1450
1451                         state = next;
1452                 }
1453
1454                 process_loop();
1455
1456                 TALLOC_FREE(frame);
1457         }
1458
1459         return 0;
1460 }