source3/winbindd/winbindd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind daemon for ntdom nss module
   5
   6    Copyright (C) by Tim Potter 2000-2002
   7    Copyright (C) Andrew Tridgell 2002
   8    Copyright (C) Jelmer Vernooij 2003
   9    Copyright (C) Volker Lendecke 2004
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "winbindd.h"
  27
  28 #undef DBGC_CLASS
  29 #define DBGC_CLASS DBGC_WINBIND
  30
  31 static bool opt_nocache = False;
  32 static bool interactive = False;
  33
  34 extern bool override_logfile;
  35
  36 struct event_context *winbind_event_context(void)
  37 {
  38         static struct event_context *ctx;
  39
  40         if (!ctx && !(ctx = event_context_init(NULL))) {
  41                 smb_panic("Could not init winbind event context");
  42         }
  43         return ctx;
  44 }
  45
  46 struct messaging_context *winbind_messaging_context(void)
  47 {
  48         static struct messaging_context *ctx;
  49
  50         if (ctx == NULL) {
  51                 ctx = messaging_init(NULL, server_id_self(),
  52                                      winbind_event_context());
  53         }
  54         if (ctx == NULL) {
  55                 DEBUG(0, ("Could not init winbind messaging context.\n"));
  56         }
  57         return ctx;
  58 }
  59
  60 /* Reload configuration */
  61
  62 static bool reload_services_file(const char *lfile)
  63 {
  64         bool ret;
  65
  66         if (lp_loaded()) {
  67                 const char *fname = lp_configfile();
  68
  69                 if (file_exist(fname) && !strcsequal(fname,get_dyn_CONFIGFILE())) {
  70                         set_dyn_CONFIGFILE(fname);
  71                 }
  72         }
  73
  74         /* if this is a child, restore the logfile to the special
  75            name - <domain>, idmap, etc. */
  76         if (lfile && *lfile) {
  77                 lp_set_logfile(lfile);
  78         }
  79
  80         reopen_logs();
  81         ret = lp_load(get_dyn_CONFIGFILE(),False,False,True,True);
  82
  83         reopen_logs();
  84         load_interfaces();
  85
  86         return(ret);
  87 }
  88
  89
  90 /**************************************************************************** **
  91  Handle a fault..
  92  **************************************************************************** */
  93
  94 static void fault_quit(void)
  95 {
  96         dump_core();
  97 }
  98
  99 static void winbindd_status(void)
 100 {
 101         struct winbindd_cli_state *tmp;
 102
 103         DEBUG(0, ("winbindd status:\n"));
 104
 105         /* Print client state information */
 106
 107         DEBUG(0, ("\t%d clients currently active\n", winbindd_num_clients()));
 108
 109         if (DEBUGLEVEL >= 2 && winbindd_num_clients()) {
 110                 DEBUG(2, ("\tclient list:\n"));
 111                 for(tmp = winbindd_client_list(); tmp; tmp = tmp->next) {
 112                         DEBUGADD(2, ("\t\tpid %lu, sock %d\n",
 113                                   (unsigned long)tmp->pid, tmp->sock));
 114                 }
 115         }
 116 }
 117
 118 /* Print winbindd status to log file */
 119
 120 static void print_winbindd_status(void)
 121 {
 122         winbindd_status();
 123 }
 124
 125 /* Flush client cache */
 126
 127 static void flush_caches(void)
 128 {
 129         /* We need to invalidate cached user list entries on a SIGHUP
 130            otherwise cached access denied errors due to restrict anonymous
 131            hang around until the sequence number changes. */
 132
 133         if (!wcache_invalidate_cache()) {
 134                 DEBUG(0, ("invalidating the cache failed; revalidate the cache\n"));
 135                 if (!winbindd_cache_validate_and_initialize()) {
 136                         exit(1);
 137                 }
 138         }
 139 }
 140
 141 /* Handle the signal by unlinking socket and exiting */
 142
 143 static void terminate(bool is_parent)
 144 {
 145         if (is_parent) {
 146                 /* When parent goes away we should
 147                  * remove the socket file. Not so
 148                  * when children terminate.
 149                  */
 150                 char *path = NULL;
 151
 152                 if (asprintf(&path, "%s/%s",
 153                         get_winbind_pipe_dir(), WINBINDD_SOCKET_NAME) > 0) {
 154                         unlink(path);
 155                         SAFE_FREE(path);
 156                 }
 157         }
 158
 159         idmap_close();
 160
 161         trustdom_cache_shutdown();
 162
 163         gencache_stabilize();
 164
 165 #if 0
 166         if (interactive) {
 167                 TALLOC_CTX *mem_ctx = talloc_init("end_description");
 168                 char *description = talloc_describe_all(mem_ctx);
 169
 170                 DEBUG(3, ("tallocs left:\n%s\n", description));
 171                 talloc_destroy(mem_ctx);
 172         }
 173 #endif
 174
 175         if (is_parent) {
 176                 pidfile_unlink();
 177         }
 178
 179         exit(0);
 180 }
 181
 182 static void winbindd_sig_term_handler(struct tevent_context *ev,
 183                                       struct tevent_signal *se,
 184                                       int signum,
 185                                       int count,
 186                                       void *siginfo,
 187                                       void *private_data)
 188 {
 189         bool *is_parent = talloc_get_type_abort(private_data, bool);
 190
 191         DEBUG(0,("Got sig[%d] terminate (is_parent=%d)\n",
 192                  signum, (int)*is_parent));
 193         terminate(*is_parent);
 194 }
 195
 196 bool winbindd_setup_sig_term_handler(bool parent)
 197 {
 198         struct tevent_signal *se;
 199         bool *is_parent;
 200
 201         is_parent = talloc(winbind_event_context(), bool);
 202         if (!is_parent) {
 203                 return false;
 204         }
 205
 206         *is_parent = parent;
 207
 208         se = tevent_add_signal(winbind_event_context(),
 209                                is_parent,
 210                                SIGTERM, 0,
 211                                winbindd_sig_term_handler,
 212                                is_parent);
 213         if (!se) {
 214                 DEBUG(0,("failed to setup SIGTERM handler"));
 215                 talloc_free(is_parent);
 216                 return false;
 217         }
 218
 219         se = tevent_add_signal(winbind_event_context(),
 220                                is_parent,
 221                                SIGINT, 0,
 222                                winbindd_sig_term_handler,
 223                                is_parent);
 224         if (!se) {
 225                 DEBUG(0,("failed to setup SIGINT handler"));
 226                 talloc_free(is_parent);
 227                 return false;
 228         }
 229
 230         se = tevent_add_signal(winbind_event_context(),
 231                                is_parent,
 232                                SIGQUIT, 0,
 233                                winbindd_sig_term_handler,
 234                                is_parent);
 235         if (!se) {
 236                 DEBUG(0,("failed to setup SIGINT handler"));
 237                 talloc_free(is_parent);
 238                 return false;
 239         }
 240
 241         return true;
 242 }
 243
 244 static void winbindd_sig_hup_handler(struct tevent_context *ev,
 245                                      struct tevent_signal *se,
 246                                      int signum,
 247                                      int count,
 248                                      void *siginfo,
 249                                      void *private_data)
 250 {
 251         const char *file = (const char *)private_data;
 252
 253         DEBUG(1,("Reloading services after SIGHUP\n"));
 254         flush_caches();
 255         reload_services_file(file);
 256 }
 257
 258 bool winbindd_setup_sig_hup_handler(const char *lfile)
 259 {
 260         struct tevent_signal *se;
 261         char *file = NULL;
 262
 263         if (lfile) {
 264                 file = talloc_strdup(winbind_event_context(),
 265                                      lfile);
 266                 if (!file) {
 267                         return false;
 268                 }
 269         }
 270
 271         se = tevent_add_signal(winbind_event_context(),
 272                                winbind_event_context(),
 273                                SIGHUP, 0,
 274                                winbindd_sig_hup_handler,
 275                                file);
 276         if (!se) {
 277                 return false;
 278         }
 279
 280         return true;
 281 }
 282
 283 static void winbindd_sig_chld_handler(struct tevent_context *ev,
 284                                       struct tevent_signal *se,
 285                                       int signum,
 286                                       int count,
 287                                       void *siginfo,
 288                                       void *private_data)
 289 {
 290         pid_t pid;
 291
 292         while ((pid = sys_waitpid(-1, NULL, WNOHANG)) > 0) {
 293                 winbind_child_died(pid);
 294         }
 295 }
 296
 297 static bool winbindd_setup_sig_chld_handler(void)
 298 {
 299         struct tevent_signal *se;
 300
 301         se = tevent_add_signal(winbind_event_context(),
 302                                winbind_event_context(),
 303                                SIGCHLD, 0,
 304                                winbindd_sig_chld_handler,
 305                                NULL);
 306         if (!se) {
 307                 return false;
 308         }
 309
 310         return true;
 311 }
 312
 313 static void winbindd_sig_usr2_handler(struct tevent_context *ev,
 314                                       struct tevent_signal *se,
 315                                       int signum,
 316                                       int count,
 317                                       void *siginfo,
 318                                       void *private_data)
 319 {
 320         print_winbindd_status();
 321 }
 322
 323 static bool winbindd_setup_sig_usr2_handler(void)
 324 {
 325         struct tevent_signal *se;
 326
 327         se = tevent_add_signal(winbind_event_context(),
 328                                winbind_event_context(),
 329                                SIGUSR2, 0,
 330                                winbindd_sig_usr2_handler,
 331                                NULL);
 332         if (!se) {
 333                 return false;
 334         }
 335
 336         return true;
 337 }
 338
 339 /* React on 'smbcontrol winbindd reload-config' in the same way as on SIGHUP*/
 340 static void msg_reload_services(struct messaging_context *msg,
 341                                 void *private_data,
 342                                 uint32_t msg_type,
 343                                 struct server_id server_id,
 344                                 DATA_BLOB *data)
 345 {
 346         /* Flush various caches */
 347         flush_caches();
 348         reload_services_file((const char *) private_data);
 349 }
 350
 351 /* React on 'smbcontrol winbindd shutdown' in the same way as on SIGTERM*/
 352 static void msg_shutdown(struct messaging_context *msg,
 353                          void *private_data,
 354                          uint32_t msg_type,
 355                          struct server_id server_id,
 356                          DATA_BLOB *data)
 357 {
 358         /* only the parent waits for this message */
 359         DEBUG(0,("Got shutdown message\n"));
 360         terminate(true);
 361 }
 362
 363
 364 static void winbind_msg_validate_cache(struct messaging_context *msg_ctx,
 365                                        void *private_data,
 366                                        uint32_t msg_type,
 367                                        struct server_id server_id,
 368                                        DATA_BLOB *data)
 369 {
 370         uint8 ret;
 371         pid_t child_pid;
 372
 373         DEBUG(10, ("winbindd_msg_validate_cache: got validate-cache "
 374                    "message.\n"));
 375
 376         /*
 377          * call the validation code from a child:
 378          * so we don't block the main winbindd and the validation
 379          * code can safely use fork/waitpid...
 380          */
 381         child_pid = sys_fork();
 382
 383         if (child_pid == -1) {
 384                 DEBUG(1, ("winbind_msg_validate_cache: Could not fork: %s\n",
 385                           strerror(errno)));
 386                 return;
 387         }
 388
 389         if (child_pid != 0) {
 390                 /* parent */
 391                 DEBUG(5, ("winbind_msg_validate_cache: child created with "
 392                           "pid %d.\n", (int)child_pid));
 393                 return;
 394         }
 395
 396         /* child */
 397
 398         if (!winbindd_reinit_after_fork(NULL)) {
 399                 _exit(0);
 400         }
 401
 402         /* install default SIGCHLD handler: validation code uses fork/waitpid */
 403         CatchSignal(SIGCHLD, SIG_DFL);
 404
 405         ret = (uint8)winbindd_validate_cache_nobackup();
 406         DEBUG(10, ("winbindd_msg_validata_cache: got return value %d\n", ret));
 407         messaging_send_buf(msg_ctx, server_id, MSG_WINBIND_VALIDATE_CACHE, &ret,
 408                            (size_t)1);
 409         _exit(0);
 410 }
 411
 412 static struct winbindd_dispatch_table {
 413         enum winbindd_cmd cmd;
 414         void (*fn)(struct winbindd_cli_state *state);
 415         const char *winbindd_cmd_name;
 416 } dispatch_table[] = {
 417
 418         /* User functions */
 419
 420         { WINBINDD_GETPWNAM, winbindd_getpwnam, "GETPWNAM" },
 421         { WINBINDD_GETPWUID, winbindd_getpwuid, "GETPWUID" },
 422         { WINBINDD_GETPWSID, winbindd_getpwsid, "GETPWSID" },
 423
 424         { WINBINDD_SETPWENT, winbindd_setpwent, "SETPWENT" },
 425         { WINBINDD_ENDPWENT, winbindd_endpwent, "ENDPWENT" },
 426         { WINBINDD_GETPWENT, winbindd_getpwent, "GETPWENT" },
 427
 428         { WINBINDD_GETGROUPS, winbindd_getgroups, "GETGROUPS" },
 429         { WINBINDD_GETUSERSIDS, winbindd_getusersids, "GETUSERSIDS" },
 430         { WINBINDD_GETUSERDOMGROUPS, winbindd_getuserdomgroups,
 431           "GETUSERDOMGROUPS" },
 432         { WINBINDD_GETSIDALIASES, winbindd_getsidaliases,
 433            "LOOKUPUSERALIASES" },
 434
 435         /* Group functions */
 436
 437         { WINBINDD_GETGRNAM, winbindd_getgrnam, "GETGRNAM" },
 438         { WINBINDD_GETGRGID, winbindd_getgrgid, "GETGRGID" },
 439         { WINBINDD_SETGRENT, winbindd_setgrent, "SETGRENT" },
 440         { WINBINDD_ENDGRENT, winbindd_endgrent, "ENDGRENT" },
 441         { WINBINDD_GETGRENT, winbindd_getgrent, "GETGRENT" },
 442         { WINBINDD_GETGRLST, winbindd_getgrent, "GETGRLST" },
 443
 444         /* PAM auth functions */
 445
 446         { WINBINDD_PAM_AUTH, winbindd_pam_auth, "PAM_AUTH" },
 447         { WINBINDD_PAM_AUTH_CRAP, winbindd_pam_auth_crap, "AUTH_CRAP" },
 448         { WINBINDD_PAM_CHAUTHTOK, winbindd_pam_chauthtok, "CHAUTHTOK" },
 449         { WINBINDD_PAM_LOGOFF, winbindd_pam_logoff, "PAM_LOGOFF" },
 450         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP, winbindd_pam_chng_pswd_auth_crap, "CHNG_PSWD_AUTH_CRAP" },
 451
 452         /* Enumeration functions */
 453
 454         { WINBINDD_LIST_USERS, winbindd_list_users, "LIST_USERS" },
 455         { WINBINDD_LIST_GROUPS, winbindd_list_groups, "LIST_GROUPS" },
 456         { WINBINDD_LIST_TRUSTDOM, winbindd_list_trusted_domains,
 457           "LIST_TRUSTDOM" },
 458         { WINBINDD_SHOW_SEQUENCE, winbindd_show_sequence, "SHOW_SEQUENCE" },
 459
 460         /* SID related functions */
 461
 462         { WINBINDD_LOOKUPSID, winbindd_lookupsid, "LOOKUPSID" },
 463         { WINBINDD_LOOKUPNAME, winbindd_lookupname, "LOOKUPNAME" },
 464         { WINBINDD_LOOKUPRIDS, winbindd_lookuprids, "LOOKUPRIDS" },
 465
 466         /* Lookup related functions */
 467
 468         { WINBINDD_SID_TO_UID, winbindd_sid_to_uid, "SID_TO_UID" },
 469         { WINBINDD_SID_TO_GID, winbindd_sid_to_gid, "SID_TO_GID" },
 470         { WINBINDD_UID_TO_SID, winbindd_uid_to_sid, "UID_TO_SID" },
 471         { WINBINDD_GID_TO_SID, winbindd_gid_to_sid, "GID_TO_SID" },
 472         { WINBINDD_ALLOCATE_UID, winbindd_allocate_uid, "ALLOCATE_UID" },
 473         { WINBINDD_ALLOCATE_GID, winbindd_allocate_gid, "ALLOCATE_GID" },
 474
 475         /* Miscellaneous */
 476
 477         { WINBINDD_CHECK_MACHACC, winbindd_check_machine_acct, "CHECK_MACHACC" },
 478         { WINBINDD_PING_DC, winbindd_ping_dc, "PING_DC" },
 479         { WINBINDD_PING, winbindd_ping, "PING" },
 480         { WINBINDD_INFO, winbindd_info, "INFO" },
 481         { WINBINDD_INTERFACE_VERSION, winbindd_interface_version,
 482           "INTERFACE_VERSION" },
 483         { WINBINDD_DOMAIN_NAME, winbindd_domain_name, "DOMAIN_NAME" },
 484         { WINBINDD_DOMAIN_INFO, winbindd_domain_info, "DOMAIN_INFO" },
 485         { WINBINDD_NETBIOS_NAME, winbindd_netbios_name, "NETBIOS_NAME" },
 486         { WINBINDD_PRIV_PIPE_DIR, winbindd_priv_pipe_dir,
 487           "WINBINDD_PRIV_PIPE_DIR" },
 488         { WINBINDD_GETDCNAME, winbindd_getdcname, "GETDCNAME" },
 489         { WINBINDD_DSGETDCNAME, winbindd_dsgetdcname, "DSGETDCNAME" },
 490
 491         /* Credential cache access */
 492         { WINBINDD_CCACHE_NTLMAUTH, winbindd_ccache_ntlm_auth, "NTLMAUTH" },
 493
 494         /* WINS functions */
 495
 496         { WINBINDD_WINS_BYNAME, winbindd_wins_byname, "WINS_BYNAME" },
 497         { WINBINDD_WINS_BYIP, winbindd_wins_byip, "WINS_BYIP" },
 498
 499         /* End of list */
 500
 501         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 502 };
 503
 504 static void process_request(struct winbindd_cli_state *state)
 505 {
 506         struct winbindd_dispatch_table *table = dispatch_table;
 507
 508         /* Free response data - we may be interrupted and receive another
 509            command before being able to send this data off. */
 510
 511         SAFE_FREE(state->response.extra_data.data);
 512
 513         ZERO_STRUCT(state->response);
 514
 515         state->response.result = WINBINDD_PENDING;
 516         state->response.length = sizeof(struct winbindd_response);
 517
 518         state->mem_ctx = talloc_init("winbind request");
 519         if (state->mem_ctx == NULL)
 520                 return;
 521
 522         /* Remember who asked us. */
 523         state->pid = state->request.pid;
 524
 525         /* Process command */
 526
 527         for (table = dispatch_table; table->fn; table++) {
 528                 if (state->request.cmd == table->cmd) {
 529                         DEBUG(10,("process_request: request fn %s\n",
 530                                   table->winbindd_cmd_name ));
 531                         table->fn(state);
 532                         break;
 533                 }
 534         }
 535
 536         if (!table->fn) {
 537                 DEBUG(10,("process_request: unknown request fn number %d\n",
 538                           (int)state->request.cmd ));
 539                 request_error(state);
 540         }
 541 }
 542
 543 /*
 544  * A list of file descriptors being monitored by select in the main processing
 545  * loop. winbindd_fd_event->handler is called whenever the socket is readable/writable.
 546  */
 547
 548 static struct winbindd_fd_event *fd_events = NULL;
 549
 550 void add_fd_event(struct winbindd_fd_event *ev)
 551 {
 552         struct winbindd_fd_event *match;
 553
 554         /* only add unique winbindd_fd_event structs */
 555
 556         for (match=fd_events; match; match=match->next ) {
 557 #ifdef DEVELOPER
 558                 SMB_ASSERT( match != ev );
 559 #else
 560                 if ( match == ev )
 561                         return;
 562 #endif
 563         }
 564
 565         DLIST_ADD(fd_events, ev);
 566 }
 567
 568 void remove_fd_event(struct winbindd_fd_event *ev)
 569 {
 570         DLIST_REMOVE(fd_events, ev);
 571 }
 572
 573 /*
 574  * Handler for winbindd_fd_events to complete a read/write request, set up by
 575  * setup_async_read/setup_async_write.
 576  */
 577
 578 static void rw_callback(struct winbindd_fd_event *event, int flags)
 579 {
 580         size_t todo;
 581         ssize_t done = 0;
 582
 583         todo = event->length - event->done;
 584
 585         if (event->flags & EVENT_FD_WRITE) {
 586                 SMB_ASSERT(flags == EVENT_FD_WRITE);
 587                 done = sys_write(event->fd,
 588                                  &((char *)event->data)[event->done],
 589                                  todo);
 590
 591                 if (done <= 0) {
 592                         event->flags = 0;
 593                         event->finished(event->private_data, False);
 594                         return;
 595                 }
 596         }
 597
 598         if (event->flags & EVENT_FD_READ) {
 599                 SMB_ASSERT(flags == EVENT_FD_READ);
 600                 done = sys_read(event->fd, &((char *)event->data)[event->done],
 601                                 todo);
 602
 603                 if (done <= 0) {
 604                         event->flags = 0;
 605                         event->finished(event->private_data, False);
 606                         return;
 607                 }
 608         }
 609
 610         event->done += done;
 611
 612         if (event->done == event->length) {
 613                 event->flags = 0;
 614                 event->finished(event->private_data, True);
 615         }
 616 }
 617
 618 /*
 619  * Request an async read/write on a winbindd_fd_event structure. (*finished) is called
 620  * when the request is completed or an error had occurred.
 621  */
 622
 623 void setup_async_read(struct winbindd_fd_event *event, void *data, size_t length,
 624                       void (*finished)(void *private_data, bool success),
 625                       void *private_data)
 626 {
 627         SMB_ASSERT(event->flags == 0);
 628         event->data = data;
 629         event->length = length;
 630         event->done = 0;
 631         event->handler = rw_callback;
 632         event->finished = finished;
 633         event->private_data = private_data;
 634         event->flags = EVENT_FD_READ;
 635 }
 636
 637 void setup_async_write(struct winbindd_fd_event *event, void *data, size_t length,
 638                        void (*finished)(void *private_data, bool success),
 639                        void *private_data)
 640 {
 641         SMB_ASSERT(event->flags == 0);
 642         event->data = data;
 643         event->length = length;
 644         event->done = 0;
 645         event->handler = rw_callback;
 646         event->finished = finished;
 647         event->private_data = private_data;
 648         event->flags = EVENT_FD_WRITE;
 649 }
 650
 651 /*
 652  * This is the main event loop of winbind requests. It goes through a
 653  * state-machine of 3 read/write requests, 4 if you have extra data to send.
 654  *
 655  * An idle winbind client has a read request of 4 bytes outstanding,
 656  * finalizing function is request_len_recv, checking the length. request_recv
 657  * then processes the packet. The processing function then at some point has
 658  * to call request_finished which schedules sending the response.
 659  */
 660
 661 static void request_len_recv(void *private_data, bool success);
 662 static void request_recv(void *private_data, bool success);
 663 static void request_main_recv(void *private_data, bool success);
 664 static void request_finished(struct winbindd_cli_state *state);
 665 static void response_main_sent(void *private_data, bool success);
 666 static void response_extra_sent(void *private_data, bool success);
 667
 668 static void response_extra_sent(void *private_data, bool success)
 669 {
 670         struct winbindd_cli_state *state =
 671                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 672
 673         TALLOC_FREE(state->mem_ctx);
 674
 675         if (!success) {
 676                 state->finished = True;
 677                 return;
 678         }
 679
 680         SAFE_FREE(state->response.extra_data.data);
 681
 682         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 683                          request_len_recv, state);
 684 }
 685
 686 static void response_main_sent(void *private_data, bool success)
 687 {
 688         struct winbindd_cli_state *state =
 689                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 690
 691         if (!success) {
 692                 state->finished = True;
 693                 return;
 694         }
 695
 696         if (state->response.length == sizeof(state->response)) {
 697                 TALLOC_FREE(state->mem_ctx);
 698
 699                 setup_async_read(&state->fd_event, &state->request,
 700                                  sizeof(uint32), request_len_recv, state);
 701                 return;
 702         }
 703
 704         setup_async_write(&state->fd_event, state->response.extra_data.data,
 705                           state->response.length - sizeof(state->response),
 706                           response_extra_sent, state);
 707 }
 708
 709 static void request_finished(struct winbindd_cli_state *state)
 710 {
 711         /* Make sure request.extra_data is freed when finish processing a request */
 712         SAFE_FREE(state->request.extra_data.data);
 713         setup_async_write(&state->fd_event, &state->response,
 714                           sizeof(state->response), response_main_sent, state);
 715 }
 716
 717 void request_error(struct winbindd_cli_state *state)
 718 {
 719         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 720         state->response.result = WINBINDD_ERROR;
 721         request_finished(state);
 722 }
 723
 724 void request_ok(struct winbindd_cli_state *state)
 725 {
 726         SMB_ASSERT(state->response.result == WINBINDD_PENDING);
 727         state->response.result = WINBINDD_OK;
 728         request_finished(state);
 729 }
 730
 731 static void request_len_recv(void *private_data, bool success)
 732 {
 733         struct winbindd_cli_state *state =
 734                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 735
 736         if (!success) {
 737                 state->finished = True;
 738                 return;
 739         }
 740
 741         if (*(uint32 *)(&state->request) != sizeof(state->request)) {
 742                 DEBUG(0,("request_len_recv: Invalid request size received: %d (expected %u)\n",
 743                          *(uint32_t *)(&state->request), (uint32_t)sizeof(state->request)));
 744                 state->finished = True;
 745                 return;
 746         }
 747
 748         setup_async_read(&state->fd_event, (uint32 *)(&state->request)+1,
 749                          sizeof(state->request) - sizeof(uint32),
 750                          request_main_recv, state);
 751 }
 752
 753 static void request_main_recv(void *private_data, bool success)
 754 {
 755         struct winbindd_cli_state *state =
 756                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 757
 758         if (!success) {
 759                 state->finished = True;
 760                 return;
 761         }
 762
 763         if (state->request.extra_len == 0) {
 764                 state->request.extra_data.data = NULL;
 765                 request_recv(state, True);
 766                 return;
 767         }
 768
 769         if ((!state->privileged) &&
 770             (state->request.extra_len > WINBINDD_MAX_EXTRA_DATA)) {
 771                 DEBUG(3, ("Got request with %d bytes extra data on "
 772                           "unprivileged socket\n", (int)state->request.extra_len));
 773                 state->request.extra_data.data = NULL;
 774                 state->finished = True;
 775                 return;
 776         }
 777
 778         state->request.extra_data.data =
 779                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
 780
 781         if (state->request.extra_data.data == NULL) {
 782                 DEBUG(0, ("malloc failed\n"));
 783                 state->finished = True;
 784                 return;
 785         }
 786
 787         /* Ensure null termination */
 788         state->request.extra_data.data[state->request.extra_len] = '\0';
 789
 790         setup_async_read(&state->fd_event, state->request.extra_data.data,
 791                          state->request.extra_len, request_recv, state);
 792 }
 793
 794 static void request_recv(void *private_data, bool success)
 795 {
 796         struct winbindd_cli_state *state =
 797                 talloc_get_type_abort(private_data, struct winbindd_cli_state);
 798
 799         if (!success) {
 800                 state->finished = True;
 801                 return;
 802         }
 803
 804         process_request(state);
 805 }
 806
 807 /* Process a new connection by adding it to the client connection list */
 808
 809 static void new_connection(int listen_sock, bool privileged)
 810 {
 811         struct sockaddr_un sunaddr;
 812         struct winbindd_cli_state *state;
 813         socklen_t len;
 814         int sock;
 815
 816         /* Accept connection */
 817
 818         len = sizeof(sunaddr);
 819
 820         do {
 821                 sock = accept(listen_sock, (struct sockaddr *)&sunaddr, &len);
 822         } while (sock == -1 && errno == EINTR);
 823
 824         if (sock == -1)
 825                 return;
 826
 827         DEBUG(6,("accepted socket %d\n", sock));
 828
 829         /* Create new connection structure */
 830
 831         if ((state = TALLOC_ZERO_P(NULL, struct winbindd_cli_state)) == NULL) {
 832                 close(sock);
 833                 return;
 834         }
 835
 836         state->sock = sock;
 837
 838         state->last_access = time(NULL);
 839
 840         state->privileged = privileged;
 841
 842         state->fd_event.fd = state->sock;
 843         state->fd_event.flags = 0;
 844         add_fd_event(&state->fd_event);
 845
 846         setup_async_read(&state->fd_event, &state->request, sizeof(uint32),
 847                          request_len_recv, state);
 848
 849         /* Add to connection list */
 850
 851         winbindd_add_client(state);
 852 }
 853
 854 /* Remove a client connection from client connection list */
 855
 856 static void remove_client(struct winbindd_cli_state *state)
 857 {
 858         char c = 0;
 859         int nwritten;
 860
 861         /* It's a dead client - hold a funeral */
 862
 863         if (state == NULL) {
 864                 return;
 865         }
 866
 867         if (!state->finished) {
 868                 /* tell client, we are closing ... */
 869                 nwritten = write(state->sock, &c, sizeof(c));
 870                 if (nwritten == -1) {
 871                         DEBUG(2, ("final write to client failed: %s\n",
 872                                   strerror(errno)));
 873                 }
 874         }
 875
 876         /* Close socket */
 877
 878         close(state->sock);
 879
 880         /* Free any getent state */
 881
 882         free_getent_state(state->getpwent_state);
 883         free_getent_state(state->getgrent_state);
 884
 885         /* We may have some extra data that was not freed if the client was
 886            killed unexpectedly */
 887
 888         SAFE_FREE(state->response.extra_data.data);
 889
 890         TALLOC_FREE(state->mem_ctx);
 891
 892         remove_fd_event(&state->fd_event);
 893
 894         /* Remove from list and free */
 895
 896         winbindd_remove_client(state);
 897         TALLOC_FREE(state);
 898 }
 899
 900 /* Shutdown client connection which has been idle for the longest time */
 901
 902 static bool remove_idle_client(void)
 903 {
 904         struct winbindd_cli_state *state, *remove_state = NULL;
 905         time_t last_access = 0;
 906         int nidle = 0;
 907
 908         for (state = winbindd_client_list(); state; state = state->next) {
 909                 if (state->response.result != WINBINDD_PENDING &&
 910                     state->fd_event.flags == EVENT_FD_READ &&
 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         if (run_events(winbind_event_context(), 0, NULL, NULL)) {
1034                 return;
1035         }
1036
1037         /* Initialise fd lists for select() */
1038
1039         FD_ZERO(&r_fds);
1040         FD_ZERO(&w_fds);
1041
1042         timeout.tv_sec = WINBINDD_ESTABLISH_LOOP;
1043         timeout.tv_usec = 0;
1044
1045         /* Check for any event timeouts. */
1046         {
1047                 struct timeval now;
1048                 GetTimeOfDay(&now);
1049
1050                 event_add_to_select_args(winbind_event_context(), &now,
1051                                          &r_fds, &w_fds, &ev_timeout, &maxfd);
1052         }
1053         if (get_timed_events_timeout(winbind_event_context(), &ev_timeout)) {
1054                 timeout = timeval_min(&timeout, &ev_timeout);
1055         }
1056
1057         for (ev = fd_events; ev; ev = ev->next) {
1058                 if (ev->flags & EVENT_FD_READ) {
1059                         FD_SET(ev->fd, &r_fds);
1060                         maxfd = MAX(ev->fd, maxfd);
1061                 }
1062                 if (ev->flags & EVENT_FD_WRITE) {
1063                         FD_SET(ev->fd, &w_fds);
1064                         maxfd = MAX(ev->fd, maxfd);
1065                 }
1066         }
1067
1068         /* Call select */
1069
1070         selret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, &timeout);
1071
1072         if (selret == 0) {
1073                 goto no_fds_ready;
1074         }
1075
1076         if (selret == -1) {
1077                 if (errno == EINTR) {
1078                         goto no_fds_ready;
1079                 }
1080
1081                 /* Select error, something is badly wrong */
1082
1083                 perror("select");
1084                 exit(1);
1085         }
1086
1087         /* selret > 0 */
1088
1089         if (run_events(winbind_event_context(), selret, &r_fds, &w_fds)) {
1090                 return;
1091         }
1092
1093         ev = fd_events;
1094         while (ev != NULL) {
1095                 struct winbindd_fd_event *next = ev->next;
1096                 int flags = 0;
1097                 if (FD_ISSET(ev->fd, &r_fds))
1098                         flags |= EVENT_FD_READ;
1099                 if (FD_ISSET(ev->fd, &w_fds))
1100                         flags |= EVENT_FD_WRITE;
1101                 if (flags) {
1102                         ev->handler(ev, flags);
1103                         return;
1104                 }
1105                 ev = next;
1106         }
1107
1108         return;
1109
1110  no_fds_ready:
1111
1112         run_events(winbind_event_context(), selret, &r_fds, &w_fds);
1113
1114 #if 0
1115         winbindd_check_cache_size(time(NULL));
1116 #endif
1117 }
1118
1119 bool winbindd_use_idmap_cache(void)
1120 {
1121         return !opt_nocache;
1122 }
1123
1124 bool winbindd_use_cache(void)
1125 {
1126         return !opt_nocache;
1127 }
1128
1129 /* Main function */
1130
1131 int main(int argc, char **argv, char **envp)
1132 {
1133         static bool is_daemon = False;
1134         static bool Fork = True;
1135         static bool log_stdout = False;
1136         static bool no_process_group = False;
1137         enum {
1138                 OPT_DAEMON = 1000,
1139                 OPT_FORK,
1140                 OPT_NO_PROCESS_GROUP,
1141                 OPT_LOG_STDOUT
1142         };
1143         struct poptOption long_options[] = {
1144                 POPT_AUTOHELP
1145                 { "stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1146                 { "foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Daemon in foreground mode" },
1147                 { "no-process-group", 0, POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1148                 { "daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1149                 { "interactive", 'i', POPT_ARG_NONE, NULL, 'i', "Interactive mode" },
1150                 { "no-caching", 'n', POPT_ARG_NONE, NULL, 'n', "Disable caching" },
1151                 POPT_COMMON_SAMBA
1152                 POPT_TABLEEND
1153         };
1154         poptContext pc;
1155         int opt;
1156         TALLOC_CTX *frame = talloc_stackframe();
1157
1158         /* glibc (?) likes to print "User defined signal 1" and exit if a
1159            SIGUSR[12] is received before a handler is installed */
1160
1161         CatchSignal(SIGUSR1, SIG_IGN);
1162         CatchSignal(SIGUSR2, SIG_IGN);
1163
1164         fault_setup((void (*)(void *))fault_quit );
1165         dump_core_setup("winbindd");
1166
1167         load_case_tables();
1168
1169         /* Initialise for running in non-root mode */
1170
1171         sec_init();
1172
1173         set_remote_machine_name("winbindd", False);
1174
1175         /* Set environment variable so we don't recursively call ourselves.
1176            This may also be useful interactively. */
1177
1178         if ( !winbind_off() ) {
1179                 DEBUG(0,("Failed to disable recusive winbindd calls.  Exiting.\n"));
1180                 exit(1);
1181         }
1182
1183         /* Initialise samba/rpc client stuff */
1184
1185         pc = poptGetContext("winbindd", argc, (const char **)argv, long_options, 0);
1186
1187         while ((opt = poptGetNextOpt(pc)) != -1) {
1188                 switch (opt) {
1189                         /* Don't become a daemon */
1190                 case OPT_DAEMON:
1191                         is_daemon = True;
1192                         break;
1193                 case 'i':
1194                         interactive = True;
1195                         log_stdout = True;
1196                         Fork = False;
1197                         break;
1198                 case OPT_FORK:
1199                         Fork = false;
1200                         break;
1201                 case OPT_NO_PROCESS_GROUP:
1202                         no_process_group = true;
1203                         break;
1204                 case OPT_LOG_STDOUT:
1205                         log_stdout = true;
1206                         break;
1207                 case 'n':
1208                         opt_nocache = true;
1209                         break;
1210                 default:
1211                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1212                                   poptBadOption(pc, 0), poptStrerror(opt));
1213                         poptPrintUsage(pc, stderr, 0);
1214                         exit(1);
1215                 }
1216         }
1217
1218         if (is_daemon && interactive) {
1219                 d_fprintf(stderr,"\nERROR: "
1220                           "Option -i|--interactive is not allowed together with -D|--daemon\n\n");
1221                 poptPrintUsage(pc, stderr, 0);
1222                 exit(1);
1223         }
1224
1225         if (log_stdout && Fork) {
1226                 d_fprintf(stderr, "\nERROR: "
1227                           "Can't log to stdout (-S) unless daemon is in foreground +(-F) or interactive (-i)\n\n");
1228                 poptPrintUsage(pc, stderr, 0);
1229                 exit(1);
1230         }
1231
1232         poptFreeContext(pc);
1233
1234         if (!override_logfile) {
1235                 char *lfile = NULL;
1236                 if (asprintf(&lfile,"%s/log.winbindd",
1237                                 get_dyn_LOGFILEBASE()) > 0) {
1238                         lp_set_logfile(lfile);
1239                         SAFE_FREE(lfile);
1240                 }
1241         }
1242         setup_logging("winbindd", log_stdout);
1243         reopen_logs();
1244
1245         DEBUG(0,("winbindd version %s started.\n", samba_version_string()));
1246         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1247
1248         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1249                 DEBUG(0, ("error opening config file\n"));
1250                 exit(1);
1251         }
1252
1253         /* Initialise messaging system */
1254
1255         if (winbind_messaging_context() == NULL) {
1256                 exit(1);
1257         }
1258
1259         if (!reload_services_file(NULL)) {
1260                 DEBUG(0, ("error opening config file\n"));
1261                 exit(1);
1262         }
1263
1264         if (!directory_exist(lp_lockdir())) {
1265                 mkdir(lp_lockdir(), 0755);
1266         }
1267
1268         /* Setup names. */
1269
1270         if (!init_names())
1271                 exit(1);
1272
1273         load_interfaces();
1274
1275         if (!secrets_init()) {
1276
1277                 DEBUG(0,("Could not initialize domain trust account secrets. Giving up\n"));
1278                 return False;
1279         }
1280
1281         /* Enable netbios namecache */
1282
1283         namecache_enable();
1284
1285         /* Unblock all signals we are interested in as they may have been
1286            blocked by the parent process. */
1287
1288         BlockSignals(False, SIGINT);
1289         BlockSignals(False, SIGQUIT);
1290         BlockSignals(False, SIGTERM);
1291         BlockSignals(False, SIGUSR1);
1292         BlockSignals(False, SIGUSR2);
1293         BlockSignals(False, SIGHUP);
1294         BlockSignals(False, SIGCHLD);
1295
1296         if (!interactive)
1297                 become_daemon(Fork, no_process_group);
1298
1299         pidfile_create("winbindd");
1300
1301 #if HAVE_SETPGID
1302         /*
1303          * If we're interactive we want to set our own process group for
1304          * signal management.
1305          */
1306         if (interactive && !no_process_group)
1307                 setpgid( (pid_t)0, (pid_t)0);
1308 #endif
1309
1310         TimeInit();
1311
1312         /* Don't use winbindd_reinit_after_fork here as
1313          * we're just starting up and haven't created any
1314          * winbindd-specific resources we must free yet. JRA.
1315          */
1316
1317         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1318                                                winbind_event_context(),
1319                                                false))) {
1320                 DEBUG(0,("reinit_after_fork() failed\n"));
1321                 exit(1);
1322         }
1323
1324         /* Setup signal handlers */
1325
1326         if (!winbindd_setup_sig_term_handler(true))
1327                 exit(1);
1328         if (!winbindd_setup_sig_hup_handler(NULL))
1329                 exit(1);
1330         if (!winbindd_setup_sig_chld_handler())
1331                 exit(1);
1332         if (!winbindd_setup_sig_usr2_handler())
1333                 exit(1);
1334
1335         CatchSignal(SIGPIPE, SIG_IGN);                 /* Ignore sigpipe */
1336
1337         /*
1338          * Ensure all cache and idmap caches are consistent
1339          * and initialized before we startup.
1340          */
1341         if (!winbindd_cache_validate_and_initialize()) {
1342                 exit(1);
1343         }
1344
1345         /* get broadcast messages */
1346
1347         if (!serverid_register(procid_self(),
1348                                FLAG_MSG_GENERAL|FLAG_MSG_DBWRAP)) {
1349                 DEBUG(1, ("Could not register myself in serverid.tdb\n"));
1350                 exit(1);
1351         }
1352
1353         /* React on 'smbcontrol winbindd reload-config' in the same way
1354            as to SIGHUP signal */
1355         messaging_register(winbind_messaging_context(), NULL,
1356                            MSG_SMB_CONF_UPDATED, msg_reload_services);
1357         messaging_register(winbind_messaging_context(), NULL,
1358                            MSG_SHUTDOWN, msg_shutdown);
1359
1360         /* Handle online/offline messages. */
1361         messaging_register(winbind_messaging_context(), NULL,
1362                            MSG_WINBIND_OFFLINE, winbind_msg_offline);
1363         messaging_register(winbind_messaging_context(), NULL,
1364                            MSG_WINBIND_ONLINE, winbind_msg_online);
1365         messaging_register(winbind_messaging_context(), NULL,
1366                            MSG_WINBIND_ONLINESTATUS, winbind_msg_onlinestatus);
1367
1368         messaging_register(winbind_messaging_context(), NULL,
1369                            MSG_DUMP_EVENT_LIST, winbind_msg_dump_event_list);
1370
1371         messaging_register(winbind_messaging_context(), NULL,
1372                            MSG_WINBIND_VALIDATE_CACHE,
1373                            winbind_msg_validate_cache);
1374
1375         messaging_register(winbind_messaging_context(), NULL,
1376                            MSG_WINBIND_DUMP_DOMAIN_LIST,
1377                            winbind_msg_dump_domain_list);
1378
1379         /* Register handler for MSG_DEBUG. */
1380         messaging_register(winbind_messaging_context(), NULL,
1381                            MSG_DEBUG,
1382                            winbind_msg_debug);
1383
1384         netsamlogon_cache_init(); /* Non-critical */
1385
1386         /* clear the cached list of trusted domains */
1387
1388         wcache_tdc_clear();
1389
1390         if (!init_domain_list()) {
1391                 DEBUG(0,("unable to initialize domain list\n"));
1392                 exit(1);
1393         }
1394
1395         init_idmap_child();
1396         init_locator_child();
1397
1398         smb_nscd_flush_user_cache();
1399         smb_nscd_flush_group_cache();
1400
1401         /* setup listen sockets */
1402
1403         if (!winbindd_setup_listeners()) {
1404                 DEBUG(0,("winbindd_setup_listeners() failed\n"));
1405                 exit(1);
1406         }
1407
1408         TALLOC_FREE(frame);
1409         /* Loop waiting for requests */
1410         while (1) {
1411                 struct winbindd_cli_state *state;
1412
1413                 frame = talloc_stackframe();
1414
1415                 /* refresh the trusted domain cache */
1416
1417                 rescan_trusted_domains();
1418
1419                 /* Dispose of client connection if it is marked as
1420                    finished */
1421                 state = winbindd_client_list();
1422                 while (state) {
1423                         struct winbindd_cli_state *next = state->next;
1424
1425                         if (state->finished) {
1426                                 remove_client(state);
1427                         }
1428
1429                         state = next;
1430                 }
1431
1432                 process_loop();
1433
1434                 TALLOC_FREE(frame);
1435         }
1436
1437         return 0;
1438 }