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