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 #if 0
 164         if (interactive) {
 165                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 166                 char *description = talloc_describe_all(mem_ctx);
 167
 168                 DEBUG(3, ("tallocs left:\n%s\n", description));
 169                 talloc_destroy(mem_ctx);
 170         }
 171 #endif
 172
 173         if (is_parent) {
 174                 pidfile_unlink();
 175         }
 176
 177         exit(0);
 178 }
 179
 180 static void winbindd_sig_term_handler(struct tevent_context *ev,
 181                                       struct tevent_signal *se,
 182                                       int signum,
 183                                       int count,
 184                                       void *siginfo,
 185                                       void *private_data)
 186 {
 187         bool *is_parent = talloc_get_type_abort(private_data, bool);
 188
 189         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 190                  signum, (int)*is_parent));
 191         terminate(*is_parent);
 192 }
 193
 194 bool winbindd_setup_sig_term_handler(bool parent)
 195 {
 196         struct tevent_signal *se;
 197         bool *is_parent;
 198
 199         is_parent = talloc(winbind_event_context(), bool);
 200         if (!is_parent) {
 201                 return false;
 202         }
 203
 204         *is_parent = parent;
 205
 206         se = tevent_add_signal(winbind_event_context(),
 207                                is_parent,
 208                                SIGTERM, 0,
 209                                winbindd_sig_term_handler,
 210                                is_parent);
 211         if (!se) {
 212                 DEBUG(0,("failed to setup SIGTERM handler"));
 213                 talloc_free(is_parent);
 214                 return false;
 215         }
 216
 217         se = tevent_add_signal(winbind_event_context(),
 218                                is_parent,
 219                                SIGINT, 0,
 220                                winbindd_sig_term_handler,
 221                                is_parent);
 222         if (!se) {
 223                 DEBUG(0,("failed to setup SIGINT handler"));
 224                 talloc_free(is_parent);
 225                 return false;
 226         }
 227
 228         se = tevent_add_signal(winbind_event_context(),
 229                                is_parent,
 230                                SIGQUIT, 0,
 231                                winbindd_sig_term_handler,
 232                                is_parent);
 233         if (!se) {
 234                 DEBUG(0,("failed to setup SIGINT handler"));
 235                 talloc_free(is_parent);
 236                 return false;
 237         }
 238
 239         return true;
 240 }
 241
 242 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 243                                      struct tevent_signal *se,
 244                                      int signum,
 245                                      int count,
 246                                      void *siginfo,
 247                                      void *private_data)
 248 {
 249         const char *file = (const char *)private_data;
 250
 251         DEBUG(1,("Reloading services after SIGHUP\n"));
 252         flush_caches();
 253         reload_services_file(file);
 254 }
 255
 256 bool winbindd_setup_sig_hup_handler(const char *lfile)
 257 {
 258         struct tevent_signal *se;
 259         char *file = NULL;
 260
 261         if (lfile) {
 262                 file = talloc_strdup(winbind_event_context(),
 263                                      lfile);
 264                 if (!file) {
 265                         return false;
 266                 }
 267         }
 268
 269         se = tevent_add_signal(winbind_event_context(),
 270                                winbind_event_context(),
 271                                SIGHUP, 0,
 272                                winbindd_sig_hup_handler,
 273                                file);
 274         if (!se) {
 275                 return false;
 276         }
 277
 278         return true;
 279 }
 280
 281 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 282                                       struct tevent_signal *se,
 283                                       int signum,
 284                                       int count,
 285                                       void *siginfo,
 286                                       void *private_data)
 287 {
 288         pid_t pid;
 289
 290         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 291                 winbind_child_died(pid);
 292         }
 293 }
 294
 295 static bool winbindd_setup_sig_chld_handler(void)
 296 {
 297         struct tevent_signal *se;
 298
 299         se = tevent_add_signal(winbind_event_context(),
 300                                winbind_event_context(),
 301                                SIGCHLD, 0,
 302                                winbindd_sig_chld_handler,
 303                                NULL);
 304         if (!se) {
 305                 return false;
 306         }
 307
 308         return true;
 309 }
 310
 311 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 312                                       struct tevent_signal *se,
 313                                       int signum,
 314                                       int count,
 315                                       void *siginfo,
 316                                       void *private_data)
 317 {
 318         print_winbindd_status();
 319 }
 320
 321 static bool winbindd_setup_sig_usr2_handler(void)
 322 {
 323         struct tevent_signal *se;
 324
 325         se = tevent_add_signal(winbind_event_context(),
 326                                winbind_event_context(),
 327                                SIGUSR2, 0,
 328                                winbindd_sig_usr2_handler,
 329                                NULL);
 330         if (!se) {
 331                 return false;
 332         }
 333
 334         return true;
 335 }
 336
 337 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 338 static void msg_reload_services(struct messaging_context *msg,
 339                                 void *private_data,
 340                                 uint32_t msg_type,
 341                                 struct server_id server_id,
 342                                 DATA_BLOB *data)
 343 {
 344         /* Flush various caches */
 345         flush_caches();
 346         reload_services_file((const char *) private_data);
 347 }
 348
 349 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 350 static void msg_shutdown(struct messaging_context *msg,
 351                          void *private_data,
 352                          uint32_t msg_type,
 353                          struct server_id server_id,
 354                          DATA_BLOB *data)
 355 {
 356         /* only the parent waits for this message */
 357         DEBUG(0,("Got shutdown message\n"));
 358         terminate(true);
 359 }
 360
 361
 362 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 363                                        void *private_data,
 364                                        uint32_t msg_type,
 365                                        struct server_id server_id,
 366                                        DATA_BLOB *data)
 367 {
 368         uint8 ret;
 369         pid_t child_pid;
 370
 371         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 372                    "message.\n"));
 373
 374         /*
 375          * call the validation code from a child:
 376          * so we don't block the main winbindd and the validation
 377          * code can safely use fork/waitpid...
 378          */
 379         child_pid = sys_fork();
 380
 381         if (child_pid == -1) {
 382                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 383                           strerror(errno)));
 384                 return;
 385         }
 386
 387         if (child_pid != 0) {
 388                 /* parent */
 389                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 390                           "pid %d.\n", (int)child_pid));
 391                 return;
 392         }
 393
 394         /* child */
 395
 396         if (!winbindd_reinit_after_fork(NULL)) {
 397                 _exit(0);
 398         }
 399
 400         ret = (uint8)winbindd_validate_cache_nobackup();
 401         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 402         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 403                            (size_t)1);
 404         _exit(0);
 405 }
 406
 407 static struct winbindd_dispatch_table {
 408         enum winbindd_cmd cmd;
 409         void (*fn)(struct winbindd_cli_state *state);
 410         const char *winbindd_cmd_name;
 411 } dispatch_table[] = {
 412
 413         /* User functions */
 414
 415         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 416         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 417         { WINBINDD_GETPWSID, winbindd_getpwsid, "GETPWSID" },
 418
 419         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 420         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 421         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 422
 423         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 424         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 425         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 426           "GETUSERDOMGROUPS" },
 427         { WINBINDD_GETSIDALIASES, winbindd_getsidaliases,
 428            "LOOKUPUSERALIASES" },
 429
 430         /* Group functions */
 431
 432         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 433         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 434         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 435         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 436         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 437         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 438
 439         /* PAM auth functions */
 440
 441         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 442         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 443         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 444         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 445         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 446
 447         /* Enumeration functions */
 448
 449         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 450         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 451         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 452           "LIST_TRUSTDOM" },
 453         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 454
 455         /* SID related functions */
 456
 457         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 458         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 459         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 460
 461         /* Lookup related functions */
 462
 463         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 464         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 465         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 466         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 467         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 468         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 469         { WINBINDD_SET_MAPPING, winbindd_set_mapping, "SET_MAPPING" },
 470         { WINBINDD_REMOVE_MAPPING, winbindd_remove_mapping, "REMOVE_MAPPING" },
 471         { WINBINDD_SET_HWM, winbindd_set_hwm, "SET_HWMS" },
 472
 473         /* Miscellaneous */
 474
 475         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 476         { WINBINDD_PING, winbindd_ping, "PING" },
 477         { WINBINDD_INFO, winbindd_info, "INFO" },
 478         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 479           "INTERFACE_VERSION" },
 480         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 481         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 482         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 483         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 484           "WINBINDD_PRIV_PIPE_DIR" },
 485         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 486         { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
 487
 488         /* Credential cache access */
 489         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 490
 491         /* WINS functions */
 492
 493         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 494         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 495
 496         /* End of list */
 497
 498         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 499 };
 500
 501 static void process_request(struct winbindd_cli_state *state)
 502 {
 503         struct winbindd_dispatch_table *table = dispatch_table;
 504
 505         /* Free response data - we may be interrupted and receive another
 506            command before being able to send this data off. */
 507
 508         SAFE_FREE(state->response.extra_data.data);
 509
 510         ZERO_STRUCT(state->response);
 511
 512         state->response.result = WINBINDD_PENDING;
 513         state->response.length = sizeof(struct winbindd_response);
 514
 515         state->mem_ctx = talloc_init("winbind request");
 516         if (state->mem_ctx == NULL)
 517                 return;
 518
 519         /* Remember who asked us. */
 520         state->pid = state->request.pid;
 521
 522         /* Process command */
 523
 524         for (table = dispatch_table; table->fn; table++) {
 525                 if (state->request.cmd == table->cmd) {
 526                         DEBUG(10,("process_request: request fn %s\n",
 527                                   table->winbindd_cmd_name ));
 528                         table->fn(state);
 529                         break;
 530                 }
 531         }
 532
 533         if (!table->fn) {
 534                 DEBUG(10,("process_request: unknown request fn number %d\n",
 535                           (int)state->request.cmd ));
 536                 request_error(state);
 537         }
 538 }
 539
 540 /*
 541  * A list of file descriptors being monitored by select in the main processing
 542  * loop. winbindd_fd_event->handler is called whenever the socket is readable/writable.
 543  */
 544
 545 static struct winbindd_fd_event *fd_events = NULL;
 546
 547 void add_fd_event(struct winbindd_fd_event *ev)
 548 {
 549         struct winbindd_fd_event *match;
 550
 551         /* only add unique winbindd_fd_event structs */
 552
 553         for (match=fd_events; match; match=match->next ) {
 554 #ifdef DEVELOPER
 555                 SMB_ASSERT( match != ev );
 556 #else
 557                 if ( match == ev )
 558                         return;
 559 #endif
 560         }
 561
 562         DLIST_ADD(fd_events, ev);
 563 }
 564
 565 void remove_fd_event(struct winbindd_fd_event *ev)
 566 {
 567         DLIST_REMOVE(fd_events, ev);
 568 }
 569
 570 /*
 571  * Handler for winbindd_fd_events to complete a read/write request, set up by
 572  * setup_async_read/setup_async_write.
 573  */
 574
 575 static void rw_callback(struct winbindd_fd_event *event, int flags)
 576 {
 577         size_t todo;
 578         ssize_t done = 0;
 579
 580         todo = event->length - event->done;
 581
 582         if (event->flags & EVENT_FD_WRITE) {
 583                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 584                 done = sys_write(event->fd,
 585                                  &((char *)event->data)[event->done],
 586                                  todo);
 587
 588                 if (done <= 0) {
 589                         event->flags = 0;
 590                         event->finished(event->private_data, False);
 591                         return;
 592                 }
 593         }
 594
 595         if (event->flags & EVENT_FD_READ) {
 596                 SMB_ASSERT(flags == EVENT_FD_READ);
 597                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 598                                 todo);
 599
 600                 if (done <= 0) {
 601                         event->flags = 0;
 602                         event->finished(event->private_data, False);
 603                         return;
 604                 }
 605         }
 606
 607         event->done += done;
 608
 609         if (event->done == event->length) {
 610                 event->flags = 0;
 611                 event->finished(event->private_data, True);
 612         }
 613 }
 614
 615 /*
 616  * Request an async read/write on a winbindd_fd_event structure. (*finished) is called
 617  * when the request is completed or an error had occurred.
 618  */
 619
 620 void setup_async_read(struct winbindd_fd_event *event, void *data, size_t length,
 621                       void (*finished)(void *private_data, bool success),
 622                       void *private_data)
 623 {
 624         SMB_ASSERT(event->flags == 0);
 625         event->data = data;
 626         event->length = length;
 627         event->done = 0;
 628         event->handler = rw_callback;
 629         event->finished = finished;
 630         event->private_data = private_data;
 631         event->flags = EVENT_FD_READ;
 632 }
 633
 634 void setup_async_write(struct winbindd_fd_event *event, void *data, size_t length,
 635                        void (*finished)(void *private_data, bool success),
 636                        void *private_data)
 637 {
 638         SMB_ASSERT(event->flags == 0);
 639         event->data = data;
 640         event->length = length;
 641         event->done = 0;
 642         event->handler = rw_callback;
 643         event->finished = finished;
 644         event->private_data = private_data;
 645         event->flags = EVENT_FD_WRITE;
 646 }
 647
 648 /*
 649  * This is the main event loop of winbind requests. It goes through a
 650  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 651  *
 652  * An idle winbind client has a read request of 4 bytes outstanding,
 653  * finalizing function is request_len_recv, checking the length. request_recv
 654  * then processes the packet. The processing function then at some point has
 655  * to call request_finished which schedules sending the response.
 656  */
 657
 658 static void request_len_recv(void *private_data, bool success);
 659 static void request_recv(void *private_data, bool success);
 660 static void request_main_recv(void *private_data, bool success);
 661 static void request_finished(struct winbindd_cli_state *state);
 662 static void response_main_sent(void *private_data, bool success);
 663 static void response_extra_sent(void *private_data, bool success);
 664
 665 static void response_extra_sent(void *private_data, bool success)
 666 {
 667         struct winbindd_cli_state *state =
 668                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 669
 670         TALLOC_FREE(state->mem_ctx);
 671
 672         if (!success) {
 673                 state->finished = True;
 674                 return;
 675         }
 676
 677         SAFE_FREE(state->response.extra_data.data);
 678
 679         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 680                          request_len_recv, state);
 681 }
 682
 683 static void response_main_sent(void *private_data, bool success)
 684 {
 685         struct winbindd_cli_state *state =
 686                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 687
 688         if (!success) {
 689                 state->finished = True;
 690                 return;
 691         }
 692
 693         if (state->response.length == sizeof(state->response)) {
 694                 TALLOC_FREE(state->mem_ctx);
 695
 696                 setup_async_read(&state->fd_event, &state->request,
 697                                  sizeof(uint32), request_len_recv, state);
 698                 return;
 699         }
 700
 701         setup_async_write(&state->fd_event, state->response.extra_data.data,
 702                           state->response.length - sizeof(state->response),
 703                           response_extra_sent, state);
 704 }
 705
 706 static void request_finished(struct winbindd_cli_state *state)
 707 {
 708         /* Make sure request.extra_data is freed when finish processing a request */
 709         SAFE_FREE(state->request.extra_data.data);
 710         setup_async_write(&state->fd_event, &state->response,
 711                           sizeof(state->response), response_main_sent, state);
 712 }
 713
 714 void request_error(struct winbindd_cli_state *state)
 715 {
 716         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 717         state->response.result = WINBINDD_ERROR;
 718         request_finished(state);
 719 }
 720
 721 void request_ok(struct winbindd_cli_state *state)
 722 {
 723         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 724         state->response.result = WINBINDD_OK;
 725         request_finished(state);
 726 }
 727
 728 static void request_len_recv(void *private_data, bool success)
 729 {
 730         struct winbindd_cli_state *state =
 731                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 732
 733         if (!success) {
 734                 state->finished = True;
 735                 return;
 736         }
 737
 738         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 739                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
 740                          *(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
 741                 state->finished = True;
 742                 return;
 743         }
 744
 745         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 746                          sizeof(state->request) - sizeof(uint32),
 747                          request_main_recv, state);
 748 }
 749
 750 static void request_main_recv(void *private_data, bool success)
 751 {
 752         struct winbindd_cli_state *state =
 753                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 754
 755         if (!success) {
 756                 state->finished = True;
 757                 return;
 758         }
 759
 760         if (state->request.extra_len == 0) {
 761                 state->request.extra_data.data = NULL;
 762                 request_recv(state, True);
 763                 return;
 764         }
 765
 766         if ((!state->privileged) &&
 767             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 768                 DEBUG(3, ("Got request with %d bytes extra data on "
 769                           "unprivileged socket\n", (int)state->request.extra_len));
 770                 state->request.extra_data.data = NULL;
 771                 state->finished = True;
 772                 return;
 773         }
 774
 775         state->request.extra_data.data =
 776                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 777
 778         if (state->request.extra_data.data == NULL) {
 779                 DEBUG(0, ("malloc failed\n"));
 780                 state->finished = True;
 781                 return;
 782         }
 783
 784         /* Ensure null termination */
 785         state->request.extra_data.data[state->request.extra_len] = '\0';
 786
 787         setup_async_read(&state->fd_event, state->request.extra_data.data,
 788                          state->request.extra_len, request_recv, state);
 789 }
 790
 791 static void request_recv(void *private_data, bool success)
 792 {
 793         struct winbindd_cli_state *state =
 794                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 795
 796         if (!success) {
 797                 state->finished = True;
 798                 return;
 799         }
 800
 801         process_request(state);
 802 }
 803
 804 /* Process a new connection by adding it to the client connection list */
 805
 806 static void new_connection(int listen_sock, bool privileged)
 807 {
 808         struct sockaddr_un sunaddr;
 809         struct winbindd_cli_state *state;
 810         socklen_t len;
 811         int sock;
 812
 813         /* Accept connection */
 814
 815         len = sizeof(sunaddr);
 816
 817         do {
 818                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 819         } while (sock == -1 && errno == EINTR);
 820
 821         if (sock == -1)
 822                 return;
 823
 824         DEBUG(6,("accepted socket %d\n", sock));
 825
 826         /* Create new connection structure */
 827
 828         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 829                 close(sock);
 830                 return;
 831         }
 832
 833         state->sock = sock;
 834
 835         state->last_access = time(NULL);
 836
 837         state->privileged = privileged;
 838
 839         state->fd_event.fd = state->sock;
 840         state->fd_event.flags = 0;
 841         add_fd_event(&state->fd_event);
 842
 843         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 844                          request_len_recv, state);
 845
 846         /* Add to connection list */
 847
 848         winbindd_add_client(state);
 849 }
 850
 851 /* Remove a client connection from client connection list */
 852
 853 static void remove_client(struct winbindd_cli_state *state)
 854 {
 855         char c = 0;
 856         int nwritten;
 857
 858         /* It's a dead client - hold a funeral */
 859
 860         if (state == NULL) {
 861                 return;
 862         }
 863
 864         if (!state->finished) {
 865                 /* tell client, we are closing ... */
 866                 nwritten = write(state->sock, &c, sizeof(c));
 867                 if (nwritten == -1) {
 868                         DEBUG(2, ("final write to client failed: %s\n",
 869                                   strerror(errno)));
 870                 }
 871         }
 872
 873         /* Close socket */
 874
 875         close(state->sock);
 876
 877         /* Free any getent state */
 878
 879         free_getent_state(state->getpwent_state);
 880         free_getent_state(state->getgrent_state);
 881
 882         /* We may have some extra data that was not freed if the client was
 883            killed unexpectedly */
 884
 885         SAFE_FREE(state->response.extra_data.data);
 886
 887         TALLOC_FREE(state->mem_ctx);
 888
 889         remove_fd_event(&state->fd_event);
 890
 891         /* Remove from list and free */
 892
 893         winbindd_remove_client(state);
 894         TALLOC_FREE(state);
 895 }
 896
 897 /* Shutdown client connection which has been idle for the longest time */
 898
 899 static bool remove_idle_client(void)
 900 {
 901         struct winbindd_cli_state *state, *remove_state = NULL;
 902         time_t last_access = 0;
 903         int nidle = 0;
 904
 905         for (state = winbindd_client_list(); state; state = state->next) {
 906                 if (state->response.result != WINBINDD_PENDING &&
 907                     state->fd_event.flags == EVENT_FD_READ &&
 908                     !state->getpwent_state && !state->getgrent_state) {
 909                         nidle++;
 910                         if (!last_access || state->last_access < last_access) {
 911                                 last_access = state->last_access;
 912                                 remove_state = state;
 913                         }
 914                 }
 915         }
 916
 917         if (remove_state) {
 918                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 919                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 920                 remove_client(remove_state);
 921                 return True;
 922         }
 923
 924         return False;
 925 }
 926
 927 struct winbindd_listen_state {
 928         bool privileged;
 929         int fd;
 930         struct tevent_fd *fde;
 931 };
 932
 933 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 934                                         struct tevent_fd *fde,
 935                                         uint16_t flags,
 936                                         void *private_data)
 937 {
 938         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 939                                           struct winbindd_listen_state);
 940
 941         while (winbindd_num_clients() >
 942                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 943                 DEBUG(5,("winbindd: Exceeding %d client "
 944                          "connections, removing idle "
 945                          "connection.\n",
 946                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 947                 if (!remove_idle_client()) {
 948                         DEBUG(0,("winbindd: Exceeding %d "
 949                                  "client connections, no idle "
 950                                  "connection found\n",
 951                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 952                         break;
 953                 }
 954         }
 955
 956         /* new, non-privileged connection */
 957         new_connection(s->fd, s->privileged);
 958 }
 959
 960 static bool winbindd_setup_listeners(void)
 961 {
 962         struct winbindd_listen_state *pub_state = NULL;
 963         struct winbindd_listen_state *priv_state = NULL;
 964
 965         pub_state = talloc(winbind_event_context(),
 966                            struct winbindd_listen_state);
 967         if (!pub_state) {
 968                 goto failed;
 969         }
 970
 971         pub_state->privileged = false;
 972         pub_state->fd = open_winbindd_socket();
 973         if (pub_state->fd == -1) {
 974                 goto failed;
 975         }
 976
 977         pub_state->fde = tevent_add_fd(winbind_event_context(),
 978                                        pub_state, pub_state->fd,
 979                                        TEVENT_FD_READ,
 980                                        winbindd_listen_fde_handler,
 981                                        pub_state);
 982         if (!pub_state->fde) {
 983                 close(pub_state->fd);
 984                 goto failed;
 985         }
 986         tevent_fd_set_auto_close(pub_state->fde);
 987
 988         priv_state = talloc(winbind_event_context(),
 989                             struct winbindd_listen_state);
 990         if (!priv_state) {
 991                 goto failed;
 992         }
 993
 994         priv_state->privileged = true;
 995         priv_state->fd = open_winbindd_priv_socket();
 996         if (priv_state->fd == -1) {
 997                 goto failed;
 998         }
 999
1000         priv_state->fde = tevent_add_fd(winbind_event_context(),
1001                                         priv_state, priv_state->fd,
1002                                         TEVENT_FD_READ,
1003                                         winbindd_listen_fde_handler,
1004                                         priv_state);
1005         if (!priv_state->fde) {
1006                 close(priv_state->fd);
1007                 goto failed;
1008         }
1009         tevent_fd_set_auto_close(priv_state->fde);
1010
1011         return true;
1012 failed:
1013         TALLOC_FREE(pub_state);
1014         TALLOC_FREE(priv_state);
1015         return false;
1016 }
1017
1018 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
1019    non-forking, non-threaded model which allows us to handle many
1020    simultaneous connections while remaining impervious to many denial of
1021    service attacks. */
1022
1023 static void process_loop(void)
1024 {
1025         struct winbindd_fd_event *ev;
1026         fd_set r_fds, w_fds;
1027         int maxfd = 0, selret;
1028         struct timeval timeout, ev_timeout;
1029
1030         if (run_events(winbind_event_context(), 0, NULL, NULL)) {
1031                 return;
1032         }
1033
1034         /* Initialise fd lists for select() */
1035
1036         FD_ZERO(&r_fds);
1037         FD_ZERO(&w_fds);
1038
1039         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
1040         timeout.tv_usec = 0;
1041
1042         /* Check for any event timeouts. */
1043         {
1044                 struct timeval now;
1045                 GetTimeOfDay(&now);
1046
1047                 /*
1048                  * Initialize this high as event_add_to_select_args()
1049                  * uses a timeval_min() on this and next_event. Fix
1050                  * from Roel van Meer <rolek@alt001.com>.
1051                  */
1052
1053                 ev_timeout.tv_sec = 999999;
1054                 ev_timeout.tv_usec = 0;
1055
1056                 event_add_to_select_args(winbind_event_context(), &now,
1057                                          &r_fds, &w_fds, &ev_timeout, &maxfd);
1058         }
1059         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
1060                 timeout = timeval_min(&timeout, &ev_timeout);
1061         }
1062
1063         for (ev = fd_events; ev; ev = ev->next) {
1064                 if (ev->flags & EVENT_FD_READ) {
1065                         FD_SET(ev->fd, &r_fds);
1066                         maxfd = MAX(ev->fd, maxfd);
1067                 }
1068                 if (ev->flags & EVENT_FD_WRITE) {
1069                         FD_SET(ev->fd, &w_fds);
1070                         maxfd = MAX(ev->fd, maxfd);
1071                 }
1072         }
1073
1074         /* Call select */
1075
1076         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
1077
1078         if (selret == 0) {
1079                 goto no_fds_ready;
1080         }
1081
1082         if (selret == -1) {
1083                 if (errno == EINTR) {
1084                         goto no_fds_ready;
1085                 }
1086
1087                 /* Select error, something is badly wrong */
1088
1089                 perror("select");
1090                 exit(1);
1091         }
1092
1093         /* selret > 0 */
1094
1095         if (run_events(winbind_event_context(), selret, &r_fds, &w_fds)) {
1096                 return;
1097         }
1098
1099         ev = fd_events;
1100         while (ev != NULL) {
1101                 struct winbindd_fd_event *next = ev->next;
1102                 int flags = 0;
1103                 if (FD_ISSET(ev->fd, &r_fds))
1104                         flags |= EVENT_FD_READ;
1105                 if (FD_ISSET(ev->fd, &w_fds))
1106                         flags |= EVENT_FD_WRITE;
1107                 if (flags) {
1108                         ev->handler(ev, flags);
1109                         return;
1110                 }
1111                 ev = next;
1112         }
1113
1114         return;
1115
1116  no_fds_ready:
1117
1118         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
1119
1120 #if 0
1121         winbindd_check_cache_size(time(NULL));
1122 #endif
1123 }
1124
1125 bool winbindd_use_idmap_cache(void)
1126 {
1127         return !opt_nocache;
1128 }
1129
1130 bool winbindd_use_cache(void)
1131 {
1132         return !opt_nocache;
1133 }
1134
1135 /* Main function */
1136
1137 int main(int argc, char **argv, char **envp)
1138 {
1139         static bool is_daemon = False;
1140         static bool Fork = True;
1141         static bool log_stdout = False;
1142         static bool no_process_group = False;
1143         enum {
1144                 OPT_DAEMON = 1000,
1145                 OPT_FORK,
1146                 OPT_NO_PROCESS_GROUP,
1147                 OPT_LOG_STDOUT
1148         };
1149         struct poptOption long_options[] = {
1150                 POPT_AUTOHELP
1151                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1152                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1153                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1154                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1155                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1156                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1157                 POPT_COMMON_SAMBA
1158                 POPT_TABLEEND
1159         };
1160         poptContext pc;
1161         int opt;
1162         TALLOC_CTX *frame = talloc_stackframe();
1163
1164         /* glibc (?) likes to print "User defined signal 1" and exit if a
1165            SIGUSR[12] is received before a handler is installed */
1166
1167         CatchSignal(SIGUSR1, SIG_IGN);
1168         CatchSignal(SIGUSR2, SIG_IGN);
1169
1170         fault_setup((void (*)(void *))fault_quit );
1171         dump_core_setup("winbindd");
1172
1173         load_case_tables();
1174
1175         /* Initialise for running in non-root mode */
1176
1177         sec_init();
1178
1179         set_remote_machine_name("winbindd", False);
1180
1181         /* Set environment variable so we don't recursively call ourselves.
1182            This may also be useful interactively. */
1183
1184         if ( !winbind_off() ) {
1185                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1186                 exit(1);
1187         }
1188
1189         /* Initialise samba/rpc client stuff */
1190
1191         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1192
1193         while ((opt = poptGetNextOpt(pc)) != -1) {
1194                 switch (opt) {
1195                         /* Don't become a daemon */
1196                 case OPT_DAEMON:
1197                         is_daemon = True;
1198                         break;
1199                 case 'i':
1200                         interactive = True;
1201                         log_stdout = True;
1202                         Fork = False;
1203                         break;
1204                 case OPT_FORK:
1205                         Fork = false;
1206                         break;
1207                 case OPT_NO_PROCESS_GROUP:
1208                         no_process_group = true;
1209                         break;
1210                 case OPT_LOG_STDOUT:
1211                         log_stdout = true;
1212                         break;
1213                 case 'n':
1214                         opt_nocache = true;
1215                         break;
1216                 default:
1217                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1218                                   poptBadOption(pc, 0), poptStrerror(opt));
1219                         poptPrintUsage(pc, stderr, 0);
1220                         exit(1);
1221                 }
1222         }
1223
1224         if (is_daemon && interactive) {
1225                 d_fprintf(stderr,"\nERROR: "
1226                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1227                 poptPrintUsage(pc, stderr, 0);
1228                 exit(1);
1229         }
1230
1231         if (log_stdout && Fork) {
1232                 d_fprintf(stderr, "\nERROR: "
1233                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1234                 poptPrintUsage(pc, stderr, 0);
1235                 exit(1);
1236         }
1237
1238         poptFreeContext(pc);
1239
1240         if (!override_logfile) {
1241                 char *lfile = NULL;
1242                 if (asprintf(&lfile,"%s/log.winbindd",
1243                                 get_dyn_LOGFILEBASE()) > 0) {
1244                         lp_set_logfile(lfile);
1245                         SAFE_FREE(lfile);
1246                 }
1247         }
1248         setup_logging("winbindd", log_stdout);
1249         reopen_logs();
1250
1251         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1252         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1253
1254         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1255                 DEBUG(0, ("error opening config file\n"));
1256                 exit(1);
1257         }
1258
1259         /* Initialise messaging system */
1260
1261         if (winbind_messaging_context() == NULL) {
1262                 exit(1);
1263         }
1264
1265         if (!reload_services_file(NULL)) {
1266                 DEBUG(0, ("error opening config file\n"));
1267                 exit(1);
1268         }
1269
1270         if (!directory_exist(lp_lockdir())) {
1271                 mkdir(lp_lockdir(), 0755);
1272         }
1273
1274         /* Setup names. */
1275
1276         if (!init_names())
1277                 exit(1);
1278
1279         load_interfaces();
1280
1281         if (!secrets_init()) {
1282
1283                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1284                 return False;
1285         }
1286
1287         /* Enable netbios namecache */
1288
1289         namecache_enable();
1290
1291         /* Unblock all signals we are interested in as they may have been
1292            blocked by the parent process. */
1293
1294         BlockSignals(False, SIGINT);
1295         BlockSignals(False, SIGQUIT);
1296         BlockSignals(False, SIGTERM);
1297         BlockSignals(False, SIGUSR1);
1298         BlockSignals(False, SIGUSR2);
1299         BlockSignals(False, SIGHUP);
1300         BlockSignals(False, SIGCHLD);
1301
1302         if (!interactive)
1303                 become_daemon(Fork, no_process_group);
1304
1305         pidfile_create("winbindd");
1306
1307 #if HAVE_SETPGID
1308         /*
1309          * If we're interactive we want to set our own process group for
1310          * signal management.
1311          */
1312         if (interactive && !no_process_group)
1313                 setpgid( (pid_t)0, (pid_t)0);
1314 #endif
1315
1316         TimeInit();
1317
1318         /* Don't use winbindd_reinit_after_fork here as
1319          * we're just starting up and haven't created any
1320          * winbindd-specific resources we must free yet. JRA.
1321          */
1322
1323         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1324                                                winbind_event_context(),
1325                                                false))) {
1326                 DEBUG(0,("reinit_after_fork() failed\n"));
1327                 exit(1);
1328         }
1329
1330         /* Setup signal handlers */
1331
1332         if (!winbindd_setup_sig_term_handler(true))
1333                 exit(1);
1334         if (!winbindd_setup_sig_hup_handler(NULL))
1335                 exit(1);
1336         if (!winbindd_setup_sig_chld_handler())
1337                 exit(1);
1338         if (!winbindd_setup_sig_usr2_handler())
1339                 exit(1);
1340
1341         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1342
1343         /*
1344          * Ensure all cache and idmap caches are consistent
1345          * and initialized before we startup.
1346          */
1347         if (!winbindd_cache_validate_and_initialize()) {
1348                 exit(1);
1349         }
1350
1351         /* get broadcast messages */
1352         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1353
1354         /* React on 'smbcontrol winbindd reload-config' in the same way
1355            as to SIGHUP signal */
1356         messaging_register(winbind_messaging_context(), NULL,
1357                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1358         messaging_register(winbind_messaging_context(), NULL,
1359                            MSG_SHUTDOWN, msg_shutdown);
1360
1361         /* Handle online/offline messages. */
1362         messaging_register(winbind_messaging_context(), NULL,
1363                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1364         messaging_register(winbind_messaging_context(), NULL,
1365                            MSG_WINBIND_ONLINE, winbind_msg_online);
1366         messaging_register(winbind_messaging_context(), NULL,
1367                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1368
1369         messaging_register(winbind_messaging_context(), NULL,
1370                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1371
1372         messaging_register(winbind_messaging_context(), NULL,
1373                            MSG_WINBIND_VALIDATE_CACHE,
1374                            winbind_msg_validate_cache);
1375
1376         messaging_register(winbind_messaging_context(), NULL,
1377                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1378                            winbind_msg_dump_domain_list);
1379
1380         /* Register handler for MSG_DEBUG. */
1381         messaging_register(winbind_messaging_context(), NULL,
1382                            MSG_DEBUG,
1383                            winbind_msg_debug);
1384
1385         netsamlogon_cache_init(); /* Non-critical */
1386
1387         /* clear the cached list of trusted domains */
1388
1389         wcache_tdc_clear();
1390
1391         if (!init_domain_list()) {
1392                 DEBUG(0,("unable to initialize domain list\n"));
1393                 exit(1);
1394         }
1395
1396         init_idmap_child();
1397         init_locator_child();
1398
1399         smb_nscd_flush_user_cache();
1400         smb_nscd_flush_group_cache();
1401
1402         /* setup listen sockets */
1403
1404         if (!winbindd_setup_listeners()) {
1405                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1406                 exit(1);
1407         }
1408
1409         TALLOC_FREE(frame);
1410         /* Loop waiting for requests */
1411         while (1) {
1412                 struct winbindd_cli_state *state;
1413
1414                 frame = talloc_stackframe();
1415
1416                 /* refresh the trusted domain cache */
1417
1418                 rescan_trusted_domains();
1419
1420                 /* Dispose of client connection if it is marked as
1421                    finished */
1422                 state = winbindd_client_list();
1423                 while (state) {
1424                         struct winbindd_cli_state *next = state->next;
1425
1426                         if (state->finished) {
1427                                 remove_client(state);
1428                         }
1429
1430                         state = next;
1431                 }
1432
1433                 process_loop();
1434
1435                 TALLOC_FREE(frame);
1436         }
1437
1438         return 0;
1439 }