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         ZERO_STRUCT(state->response);
 512
 513         state->response.result = WINBINDD_PENDING;
 514         state->response.length = sizeof(struct winbindd_response);
 515
 516         state->mem_ctx = talloc_init("winbind request");
 517         if (state->mem_ctx == NULL)
 518                 return;
 519
 520         /* Remember who asked us. */
 521         state->pid = state->request.pid;
 522
 523         /* Process command */
 524
 525         for (table = dispatch_table; table->fn; table++) {
 526                 if (state->request.cmd == table->cmd) {
 527                         DEBUG(10,("process_request: request fn %s\n",
 528                                   table->winbindd_cmd_name ));
 529                         table->fn(state);
 530                         break;
 531                 }
 532         }
 533
 534         if (!table->fn) {
 535                 DEBUG(10,("process_request: unknown request fn number %d\n",
 536                           (int)state->request.cmd ));
 537                 request_error(state);
 538         }
 539 }
 540
 541 /*
 542  * A list of file descriptors being monitored by select in the main processing
 543  * loop. winbindd_fd_event->handler is called whenever the socket is readable/writable.
 544  */
 545
 546 static struct winbindd_fd_event *fd_events = NULL;
 547
 548 void add_fd_event(struct winbindd_fd_event *ev)
 549 {
 550         struct winbindd_fd_event *match;
 551
 552         /* only add unique winbindd_fd_event structs */
 553
 554         for (match=fd_events; match; match=match->next ) {
 555 #ifdef DEVELOPER
 556                 SMB_ASSERT( match != ev );
 557 #else
 558                 if ( match == ev )
 559                         return;
 560 #endif
 561         }
 562
 563         DLIST_ADD(fd_events, ev);
 564 }
 565
 566 void remove_fd_event(struct winbindd_fd_event *ev)
 567 {
 568         DLIST_REMOVE(fd_events, ev);
 569 }
 570
 571 /*
 572  * Handler for winbindd_fd_events to complete a read/write request, set up by
 573  * setup_async_read/setup_async_write.
 574  */
 575
 576 static void rw_callback(struct winbindd_fd_event *event, int flags)
 577 {
 578         size_t todo;
 579         ssize_t done = 0;
 580
 581         todo = event->length - event->done;
 582
 583         if (event->flags & EVENT_FD_WRITE) {
 584                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 585                 done = sys_write(event->fd,
 586                                  &((char *)event->data)[event->done],
 587                                  todo);
 588
 589                 if (done <= 0) {
 590                         event->flags = 0;
 591                         event->finished(event->private_data, False);
 592                         return;
 593                 }
 594         }
 595
 596         if (event->flags & EVENT_FD_READ) {
 597                 SMB_ASSERT(flags == EVENT_FD_READ);
 598                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 599                                 todo);
 600
 601                 if (done <= 0) {
 602                         event->flags = 0;
 603                         event->finished(event->private_data, False);
 604                         return;
 605                 }
 606         }
 607
 608         event->done += done;
 609
 610         if (event->done == event->length) {
 611                 event->flags = 0;
 612                 event->finished(event->private_data, True);
 613         }
 614 }
 615
 616 /*
 617  * Request an async read/write on a winbindd_fd_event structure. (*finished) is called
 618  * when the request is completed or an error had occurred.
 619  */
 620
 621 void setup_async_read(struct winbindd_fd_event *event, void *data, size_t length,
 622                       void (*finished)(void *private_data, bool success),
 623                       void *private_data)
 624 {
 625         SMB_ASSERT(event->flags == 0);
 626         event->data = data;
 627         event->length = length;
 628         event->done = 0;
 629         event->handler = rw_callback;
 630         event->finished = finished;
 631         event->private_data = private_data;
 632         event->flags = EVENT_FD_READ;
 633 }
 634
 635 void setup_async_write(struct winbindd_fd_event *event, void *data, size_t length,
 636                        void (*finished)(void *private_data, bool success),
 637                        void *private_data)
 638 {
 639         SMB_ASSERT(event->flags == 0);
 640         event->data = data;
 641         event->length = length;
 642         event->done = 0;
 643         event->handler = rw_callback;
 644         event->finished = finished;
 645         event->private_data = private_data;
 646         event->flags = EVENT_FD_WRITE;
 647 }
 648
 649 /*
 650  * This is the main event loop of winbind requests. It goes through a
 651  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 652  *
 653  * An idle winbind client has a read request of 4 bytes outstanding,
 654  * finalizing function is request_len_recv, checking the length. request_recv
 655  * then processes the packet. The processing function then at some point has
 656  * to call request_finished which schedules sending the response.
 657  */
 658
 659 static void request_len_recv(void *private_data, bool success);
 660 static void request_recv(void *private_data, bool success);
 661 static void request_main_recv(void *private_data, bool success);
 662 static void request_finished(struct winbindd_cli_state *state);
 663 static void response_main_sent(void *private_data, bool success);
 664 static void response_extra_sent(void *private_data, bool success);
 665
 666 static void response_extra_sent(void *private_data, bool success)
 667 {
 668         struct winbindd_cli_state *state =
 669                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 670
 671         TALLOC_FREE(state->mem_ctx);
 672
 673         if (!success) {
 674                 state->finished = True;
 675                 return;
 676         }
 677
 678         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 679                          request_len_recv, state);
 680 }
 681
 682 static void response_main_sent(void *private_data, bool success)
 683 {
 684         struct winbindd_cli_state *state =
 685                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 686
 687         if (!success) {
 688                 state->finished = True;
 689                 return;
 690         }
 691
 692         if (state->response.length == sizeof(state->response)) {
 693                 TALLOC_FREE(state->mem_ctx);
 694
 695                 setup_async_read(&state->fd_event, &state->request,
 696                                  sizeof(uint32), request_len_recv, state);
 697                 return;
 698         }
 699
 700         setup_async_write(&state->fd_event, state->response.extra_data.data,
 701                           state->response.length - sizeof(state->response),
 702                           response_extra_sent, state);
 703 }
 704
 705 static void request_finished(struct winbindd_cli_state *state)
 706 {
 707         /* Make sure request.extra_data is freed when finish processing a request */
 708         SAFE_FREE(state->request.extra_data.data);
 709         setup_async_write(&state->fd_event, &state->response,
 710                           sizeof(state->response), response_main_sent, state);
 711 }
 712
 713 void request_error(struct winbindd_cli_state *state)
 714 {
 715         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 716         state->response.result = WINBINDD_ERROR;
 717         request_finished(state);
 718 }
 719
 720 void request_ok(struct winbindd_cli_state *state)
 721 {
 722         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 723         state->response.result = WINBINDD_OK;
 724         request_finished(state);
 725 }
 726
 727 static void request_len_recv(void *private_data, bool success)
 728 {
 729         struct winbindd_cli_state *state =
 730                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 731
 732         if (!success) {
 733                 state->finished = True;
 734                 return;
 735         }
 736
 737         if (*(uint32 *)(void *)(&state->request) != sizeof(state->request)) {
 738                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
 739                          *(uint32_t *)(void *)(&state->request),
 740                          (uint32_t)sizeof(state->request)));
 741                 state->finished = True;
 742                 return;
 743         }
 744
 745         setup_async_read(&state->fd_event,
 746                          (uint32 *)(void *)(&state->request)+1,
 747                          sizeof(state->request) - sizeof(uint32),
 748                          request_main_recv, state);
 749 }
 750
 751 static void request_main_recv(void *private_data, bool success)
 752 {
 753         struct winbindd_cli_state *state =
 754                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 755
 756         if (!success) {
 757                 state->finished = True;
 758                 return;
 759         }
 760
 761         if (state->request.extra_len == 0) {
 762                 state->request.extra_data.data = NULL;
 763                 request_recv(state, True);
 764                 return;
 765         }
 766
 767         if ((!state->privileged) &&
 768             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 769                 DEBUG(3, ("Got request with %d bytes extra data on "
 770                           "unprivileged socket\n", (int)state->request.extra_len));
 771                 state->request.extra_data.data = NULL;
 772                 state->finished = True;
 773                 return;
 774         }
 775
 776         state->request.extra_data.data =
 777                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 778
 779         if (state->request.extra_data.data == NULL) {
 780                 DEBUG(0, ("malloc failed\n"));
 781                 state->finished = True;
 782                 return;
 783         }
 784
 785         /* Ensure null termination */
 786         state->request.extra_data.data[state->request.extra_len] = '\0';
 787
 788         setup_async_read(&state->fd_event, state->request.extra_data.data,
 789                          state->request.extra_len, request_recv, state);
 790 }
 791
 792 static void request_recv(void *private_data, bool success)
 793 {
 794         struct winbindd_cli_state *state =
 795                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 796
 797         if (!success) {
 798                 state->finished = True;
 799                 return;
 800         }
 801
 802         process_request(state);
 803 }
 804
 805 /* Process a new connection by adding it to the client connection list */
 806
 807 static void new_connection(int listen_sock, bool privileged)
 808 {
 809         struct sockaddr_un sunaddr;
 810         struct winbindd_cli_state *state;
 811         socklen_t len;
 812         int sock;
 813
 814         /* Accept connection */
 815
 816         len = sizeof(sunaddr);
 817
 818         do {
 819                 sock = accept(listen_sock, (struct sockaddr *)(void *)&sunaddr,
 820                               &len);
 821         } while (sock == -1 && errno == EINTR);
 822
 823         if (sock == -1)
 824                 return;
 825
 826         DEBUG(6,("accepted socket %d\n", sock));
 827
 828         /* Create new connection structure */
 829
 830         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 831                 close(sock);
 832                 return;
 833         }
 834
 835         state->sock = sock;
 836
 837         state->last_access = time(NULL);
 838
 839         state->privileged = privileged;
 840
 841         state->fd_event.fd = state->sock;
 842         state->fd_event.flags = 0;
 843         add_fd_event(&state->fd_event);
 844
 845         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 846                          request_len_recv, state);
 847
 848         /* Add to connection list */
 849
 850         winbindd_add_client(state);
 851 }
 852
 853 /* Remove a client connection from client connection list */
 854
 855 static void remove_client(struct winbindd_cli_state *state)
 856 {
 857         char c = 0;
 858         int nwritten;
 859
 860         /* It's a dead client - hold a funeral */
 861
 862         if (state == NULL) {
 863                 return;
 864         }
 865
 866         /* tell client, we are closing ... */
 867         nwritten = write(state->sock, &c, sizeof(c));
 868         if (nwritten == -1) {
 869                 /*
 870                  * ignore EPIPE error here, because the other end might
 871                  * have already closed the socket.
 872                  */
 873                 if (errno != EPIPE) {
 874                         DEBUG(2, ("final write to client failed: %s\n",
 875                                 strerror(errno)));
 876                 }
 877         }
 878
 879         /* Close socket */
 880
 881         close(state->sock);
 882
 883         /* Free any getent state */
 884
 885         free_getent_state(state->getpwent_state);
 886         free_getent_state(state->getgrent_state);
 887
 888         TALLOC_FREE(state->mem_ctx);
 889
 890         remove_fd_event(&state->fd_event);
 891
 892         /* Remove from list and free */
 893
 894         winbindd_remove_client(state);
 895         TALLOC_FREE(state);
 896 }
 897
 898 /* Shutdown client connection which has been idle for the longest time */
 899
 900 static bool remove_idle_client(void)
 901 {
 902         struct winbindd_cli_state *state, *remove_state = NULL;
 903         time_t last_access = 0;
 904         int nidle = 0;
 905
 906         for (state = winbindd_client_list(); state; state = state->next) {
 907                 if (state->response.result != WINBINDD_PENDING &&
 908                     state->fd_event.flags == EVENT_FD_READ &&
 909                     !state->getpwent_state && !state->getgrent_state) {
 910                         nidle++;
 911                         if (!last_access || state->last_access < last_access) {
 912                                 last_access = state->last_access;
 913                                 remove_state = state;
 914                         }
 915                 }
 916         }
 917
 918         if (remove_state) {
 919                 DEBUG(5,("Found %d idle client connections, shutting down sock %d, pid %u\n",
 920                         nidle, remove_state->sock, (unsigned int)remove_state->pid));
 921                 remove_client(remove_state);
 922                 return True;
 923         }
 924
 925         return False;
 926 }
 927
 928 struct winbindd_listen_state {
 929         bool privileged;
 930         int fd;
 931         struct tevent_fd *fde;
 932 };
 933
 934 static void winbindd_listen_fde_handler(struct tevent_context *ev,
 935                                         struct tevent_fd *fde,
 936                                         uint16_t flags,
 937                                         void *private_data)
 938 {
 939         struct winbindd_listen_state *s = talloc_get_type_abort(private_data,
 940                                           struct winbindd_listen_state);
 941
 942         while (winbindd_num_clients() >
 943                WINBINDD_MAX_SIMULTANEOUS_CLIENTS - 1) {
 944                 DEBUG(5,("winbindd: Exceeding %d client "
 945                          "connections, removing idle "
 946                          "connection.\n",
 947                          WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 948                 if (!remove_idle_client()) {
 949                         DEBUG(0,("winbindd: Exceeding %d "
 950                                  "client connections, no idle "
 951                                  "connection found\n",
 952                                  WINBINDD_MAX_SIMULTANEOUS_CLIENTS));
 953                         break;
 954                 }
 955         }
 956         new_connection(s->fd, s->privileged);
 957 }
 958
 959 static bool winbindd_setup_listeners(void)
 960 {
 961         struct winbindd_listen_state *pub_state = NULL;
 962         struct winbindd_listen_state *priv_state = NULL;
 963
 964         pub_state = talloc(winbind_event_context(),
 965                            struct winbindd_listen_state);
 966         if (!pub_state) {
 967                 goto failed;
 968         }
 969
 970         pub_state->privileged = false;
 971         pub_state->fd = open_winbindd_socket();
 972         if (pub_state->fd == -1) {
 973                 goto failed;
 974         }
 975
 976         pub_state->fde = tevent_add_fd(winbind_event_context(),
 977                                        pub_state, pub_state->fd,
 978                                        TEVENT_FD_READ,
 979                                        winbindd_listen_fde_handler,
 980                                        pub_state);
 981         if (!pub_state->fde) {
 982                 close(pub_state->fd);
 983                 goto failed;
 984         }
 985         tevent_fd_set_auto_close(pub_state->fde);
 986
 987         priv_state = talloc(winbind_event_context(),
 988                             struct winbindd_listen_state);
 989         if (!priv_state) {
 990                 goto failed;
 991         }
 992
 993         priv_state->privileged = true;
 994         priv_state->fd = open_winbindd_priv_socket();
 995         if (priv_state->fd == -1) {
 996                 goto failed;
 997         }
 998
 999         priv_state->fde = tevent_add_fd(winbind_event_context(),
1000                                         priv_state, priv_state->fd,
1001                                         TEVENT_FD_READ,
1002                                         winbindd_listen_fde_handler,
1003                                         priv_state);
1004         if (!priv_state->fde) {
1005                 close(priv_state->fd);
1006                 goto failed;
1007         }
1008         tevent_fd_set_auto_close(priv_state->fde);
1009
1010         return true;
1011 failed:
1012         TALLOC_FREE(pub_state);
1013         TALLOC_FREE(priv_state);
1014         return false;
1015 }
1016
1017 /* Process incoming clients on listen_sock.  We use a tricky non-blocking,
1018    non-forking, non-threaded model which allows us to handle many
1019    simultaneous connections while remaining impervious to many denial of
1020    service attacks. */
1021
1022 static void process_loop(void)
1023 {
1024         struct winbindd_fd_event *ev;
1025         fd_set r_fds, w_fds;
1026         int maxfd = 0, selret;
1027         struct timeval timeout, ev_timeout;
1028
1029         run_events(winbind_event_context(), 0, NULL, NULL);
1030
1031         /* Initialise fd lists for select() */
1032
1033         FD_ZERO(&r_fds);
1034         FD_ZERO(&w_fds);
1035
1036         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
1037         timeout.tv_usec = 0;
1038
1039         /* Check for any event timeouts. */
1040         {
1041                 struct timeval now;
1042                 GetTimeOfDay(&now);
1043
1044                 event_add_to_select_args(winbind_event_context(), &now,
1045                                          &r_fds, &w_fds, &ev_timeout, &maxfd);
1046         }
1047         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
1048                 timeout = timeval_min(&timeout, &ev_timeout);
1049         }
1050
1051         for (ev = fd_events; ev; ev = ev->next) {
1052                 if (ev->flags & EVENT_FD_READ) {
1053                         FD_SET(ev->fd, &r_fds);
1054                         maxfd = MAX(ev->fd, maxfd);
1055                 }
1056                 if (ev->flags & EVENT_FD_WRITE) {
1057                         FD_SET(ev->fd, &w_fds);
1058                         maxfd = MAX(ev->fd, maxfd);
1059                 }
1060         }
1061
1062         /* Call select */
1063
1064         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
1065
1066         if (selret == 0) {
1067                 goto no_fds_ready;
1068         }
1069
1070         if (selret == -1) {
1071                 if (errno == EINTR) {
1072                         goto no_fds_ready;
1073                 }
1074
1075                 /* Select error, something is badly wrong */
1076
1077                 perror("select");
1078                 exit(1);
1079         }
1080
1081         /* selret > 0 */
1082
1083         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
1084
1085         ev = fd_events;
1086         while (ev != NULL) {
1087                 struct winbindd_fd_event *next = ev->next;
1088                 int flags = 0;
1089                 if (FD_ISSET(ev->fd, &r_fds))
1090                         flags |= EVENT_FD_READ;
1091                 if (FD_ISSET(ev->fd, &w_fds))
1092                         flags |= EVENT_FD_WRITE;
1093                 if (flags)
1094                         ev->handler(ev, flags);
1095                 ev = next;
1096         }
1097
1098         return;
1099
1100  no_fds_ready:
1101
1102         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
1103
1104 #if 0
1105         winbindd_check_cache_size(time(NULL));
1106 #endif
1107 }
1108
1109 bool winbindd_use_idmap_cache(void)
1110 {
1111         return !opt_nocache;
1112 }
1113
1114 bool winbindd_use_cache(void)
1115 {
1116         return !opt_nocache;
1117 }
1118
1119 /* Main function */
1120
1121 int main(int argc, char **argv, char **envp)
1122 {
1123         static bool is_daemon = False;
1124         static bool Fork = True;
1125         static bool log_stdout = False;
1126         static bool no_process_group = False;
1127         enum {
1128                 OPT_DAEMON = 1000,
1129                 OPT_FORK,
1130                 OPT_NO_PROCESS_GROUP,
1131                 OPT_LOG_STDOUT
1132         };
1133         struct poptOption long_options[] = {
1134                 POPT_AUTOHELP
1135                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1136                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1137                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1138                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1139                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1140                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1141                 POPT_COMMON_SAMBA
1142                 POPT_TABLEEND
1143         };
1144         poptContext pc;
1145         int opt;
1146         TALLOC_CTX *frame = talloc_stackframe();
1147
1148         /* glibc (?) likes to print "User defined signal 1" and exit if a
1149            SIGUSR[12] is received before a handler is installed */
1150
1151         CatchSignal(SIGUSR1, SIG_IGN);
1152         CatchSignal(SIGUSR2, SIG_IGN);
1153
1154         fault_setup((void (*)(void *))fault_quit );
1155         dump_core_setup("winbindd");
1156
1157         load_case_tables();
1158
1159         /* Initialise for running in non-root mode */
1160
1161         sec_init();
1162
1163         set_remote_machine_name("winbindd", False);
1164
1165         /* Set environment variable so we don't recursively call ourselves.
1166            This may also be useful interactively. */
1167
1168         if ( !winbind_off() ) {
1169                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1170                 exit(1);
1171         }
1172
1173         /* Initialise samba/rpc client stuff */
1174
1175         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1176
1177         while ((opt = poptGetNextOpt(pc)) != -1) {
1178                 switch (opt) {
1179                         /* Don't become a daemon */
1180                 case OPT_DAEMON:
1181                         is_daemon = True;
1182                         break;
1183                 case 'i':
1184                         interactive = True;
1185                         log_stdout = True;
1186                         Fork = False;
1187                         break;
1188                 case OPT_FORK:
1189                         Fork = false;
1190                         break;
1191                 case OPT_NO_PROCESS_GROUP:
1192                         no_process_group = true;
1193                         break;
1194                 case OPT_LOG_STDOUT:
1195                         log_stdout = true;
1196                         break;
1197                 case 'n':
1198                         opt_nocache = true;
1199                         break;
1200                 default:
1201                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1202                                   poptBadOption(pc, 0), poptStrerror(opt));
1203                         poptPrintUsage(pc, stderr, 0);
1204                         exit(1);
1205                 }
1206         }
1207
1208         if (is_daemon && interactive) {
1209                 d_fprintf(stderr,"\nERROR: "
1210                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1211                 poptPrintUsage(pc, stderr, 0);
1212                 exit(1);
1213         }
1214
1215         if (log_stdout && Fork) {
1216                 d_fprintf(stderr, "\nERROR: "
1217                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1218                 poptPrintUsage(pc, stderr, 0);
1219                 exit(1);
1220         }
1221
1222         poptFreeContext(pc);
1223
1224         if (!override_logfile) {
1225                 char *lfile = NULL;
1226                 if (asprintf(&lfile,"%s/log.winbindd",
1227                                 get_dyn_LOGFILEBASE()) > 0) {
1228                         lp_set_logfile(lfile);
1229                         SAFE_FREE(lfile);
1230                 }
1231         }
1232         setup_logging("winbindd", log_stdout);
1233         reopen_logs();
1234
1235         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1236         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1237
1238         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1239                 DEBUG(0, ("error opening config file\n"));
1240                 exit(1);
1241         }
1242
1243         /* Initialise messaging system */
1244
1245         if (winbind_messaging_context() == NULL) {
1246                 exit(1);
1247         }
1248
1249         if (!reload_services_file(NULL)) {
1250                 DEBUG(0, ("error opening config file\n"));
1251                 exit(1);
1252         }
1253
1254         if (!directory_exist(lp_lockdir())) {
1255                 mkdir(lp_lockdir(), 0755);
1256         }
1257
1258         /* Setup names. */
1259
1260         if (!init_names())
1261                 exit(1);
1262
1263         load_interfaces();
1264
1265         if (!secrets_init()) {
1266
1267                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1268                 return False;
1269         }
1270
1271         /* Enable netbios namecache */
1272
1273         namecache_enable();
1274
1275         /* Unblock all signals we are interested in as they may have been
1276            blocked by the parent process. */
1277
1278         BlockSignals(False, SIGINT);
1279         BlockSignals(False, SIGQUIT);
1280         BlockSignals(False, SIGTERM);
1281         BlockSignals(False, SIGUSR1);
1282         BlockSignals(False, SIGUSR2);
1283         BlockSignals(False, SIGHUP);
1284         BlockSignals(False, SIGCHLD);
1285
1286         if (!interactive)
1287                 become_daemon(Fork, no_process_group);
1288
1289         pidfile_create("winbindd");
1290
1291 #if HAVE_SETPGID
1292         /*
1293          * If we're interactive we want to set our own process group for
1294          * signal management.
1295          */
1296         if (interactive && !no_process_group)
1297                 setpgid( (pid_t)0, (pid_t)0);
1298 #endif
1299
1300         TimeInit();
1301
1302         /* Don't use winbindd_reinit_after_fork here as
1303          * we're just starting up and haven't created any
1304          * winbindd-specific resources we must free yet. JRA.
1305          */
1306
1307         if (!reinit_after_fork(winbind_messaging_context(),
1308                                winbind_event_context(), false)) {
1309                 DEBUG(0,("reinit_after_fork() failed\n"));
1310                 exit(1);
1311         }
1312
1313         /* Setup signal handlers */
1314
1315         if (!winbindd_setup_sig_term_handler(true))
1316                 exit(1);
1317         if (!winbindd_setup_sig_hup_handler(NULL))
1318                 exit(1);
1319         if (!winbindd_setup_sig_chld_handler())
1320                 exit(1);
1321         if (!winbindd_setup_sig_usr2_handler())
1322                 exit(1);
1323
1324         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1325
1326         /*
1327          * Ensure all cache and idmap caches are consistent
1328          * and initialized before we startup.
1329          */
1330         if (!winbindd_cache_validate_and_initialize()) {
1331                 exit(1);
1332         }
1333
1334         /* get broadcast messages */
1335         claim_connection(NULL,"",FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP);
1336
1337         /* React on 'smbcontrol winbindd reload-config' in the same way
1338            as to SIGHUP signal */
1339         messaging_register(winbind_messaging_context(), NULL,
1340                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1341         messaging_register(winbind_messaging_context(), NULL,
1342                            MSG_SHUTDOWN, msg_shutdown);
1343
1344         /* Handle online/offline messages. */
1345         messaging_register(winbind_messaging_context(), NULL,
1346                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1347         messaging_register(winbind_messaging_context(), NULL,
1348                            MSG_WINBIND_ONLINE, winbind_msg_online);
1349         messaging_register(winbind_messaging_context(), NULL,
1350                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1351
1352         messaging_register(winbind_messaging_context(), NULL,
1353                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1354
1355         messaging_register(winbind_messaging_context(), NULL,
1356                            MSG_WINBIND_VALIDATE_CACHE,
1357                            winbind_msg_validate_cache);
1358
1359         messaging_register(winbind_messaging_context(), NULL,
1360                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1361                            winbind_msg_dump_domain_list);
1362
1363         /* Register handler for MSG_DEBUG. */
1364         messaging_register(winbind_messaging_context(), NULL,
1365                            MSG_DEBUG,
1366                            winbind_msg_debug);
1367
1368         netsamlogon_cache_init(); /* Non-critical */
1369
1370         /* clear the cached list of trusted domains */
1371
1372         wcache_tdc_clear();
1373
1374         if (!init_domain_list()) {
1375                 DEBUG(0,("unable to initialize domain list\n"));
1376                 exit(1);
1377         }
1378
1379         init_idmap_child();
1380         init_locator_child();
1381
1382         smb_nscd_flush_user_cache();
1383         smb_nscd_flush_group_cache();
1384
1385         /* setup listen sockets */
1386
1387         if (!winbindd_setup_listeners()) {
1388                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1389                 exit(1);
1390         }
1391
1392         TALLOC_FREE(frame);
1393         /* Loop waiting for requests */
1394         while (1) {
1395                 struct winbindd_cli_state *state;
1396
1397                 frame = talloc_stackframe();
1398
1399                 /* refresh the trusted domain cache */
1400
1401                 rescan_trusted_domains();
1402
1403                 /* Dispose of client connection if it is marked as
1404                    finished */
1405                 state = winbindd_client_list();
1406                 while (state) {
1407                         struct winbindd_cli_state *next = state->next;
1408
1409                         if (state->finished) {
1410                                 remove_client(state);
1411                         }
1412
1413                         state = next;
1414                 }
1415
1416                 process_loop();
1417
1418                 TALLOC_FREE(frame);
1419         }
1420
1421         return 0;
1422 }