source3/winbindd/winbindd_dual.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind child daemons
   5
   6    Copyright (C) Andrew Tridgell 2002
   7    Copyright (C) Volker Lendecke 2004,2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  * We fork a child per domain to be able to act non-blocking in the main
  25  * winbind daemon. A domain controller thousands of miles away being being
  26  * slow replying with a 10.000 user list should not hold up netlogon calls
  27  * that can be handled locally.
  28  */
  29
  30 #include "includes.h"
  31 #include "winbindd.h"
  32 #include "../../nsswitch/libwbclient/wbc_async.h"
  33 #include "librpc/gen_ndr/messaging.h"
  34
  35 #undef DBGC_CLASS
  36 #define DBGC_CLASS DBGC_WINBIND
  37
  38 extern bool override_logfile;
  39 extern struct winbindd_methods cache_methods;
  40
  41 /* Read some data from a client connection */
  42
  43 static NTSTATUS child_read_request(struct winbindd_cli_state *state)
  44 {
  45         NTSTATUS status;
  46
  47         /* Read data */
  48
  49         status = read_data(state->sock, (char *)state->request,
  50                            sizeof(*state->request));
  51
  52         if (!NT_STATUS_IS_OK(status)) {
  53                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  54                           nt_errstr(status)));
  55                 return status;
  56         }
  57
  58         if (state->request->extra_len == 0) {
  59                 state->request->extra_data.data = NULL;
  60                 return NT_STATUS_OK;
  61         }
  62
  63         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request->extra_len));
  64
  65         state->request->extra_data.data =
  66                 SMB_MALLOC_ARRAY(char, state->request->extra_len + 1);
  67
  68         if (state->request->extra_data.data == NULL) {
  69                 DEBUG(0, ("malloc failed\n"));
  70                 return NT_STATUS_NO_MEMORY;
  71         }
  72
  73         /* Ensure null termination */
  74         state->request->extra_data.data[state->request->extra_len] = '\0';
  75
  76         status= read_data(state->sock, state->request->extra_data.data,
  77                           state->request->extra_len);
  78
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 DEBUG(0, ("Could not read extra data: %s\n",
  81                           nt_errstr(status)));
  82         }
  83         return status;
  84 }
  85
  86 /*
  87  * Do winbind child async request. This is not simply wb_simple_trans. We have
  88  * to do the queueing ourselves because while a request is queued, the child
  89  * might have crashed, and we have to re-fork it in the _trigger function.
  90  */
  91
  92 struct wb_child_request_state {
  93         struct tevent_context *ev;
  94         struct winbindd_child *child;
  95         struct winbindd_request *request;
  96         struct winbindd_response *response;
  97 };
  98
  99 static bool fork_domain_child(struct winbindd_child *child);
 100
 101 static void wb_child_request_trigger(struct tevent_req *req,
 102                                             void *private_data);
 103 static void wb_child_request_done(struct tevent_req *subreq);
 104
 105 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
 106                                          struct tevent_context *ev,
 107                                          struct winbindd_child *child,
 108                                          struct winbindd_request *request)
 109 {
 110         struct tevent_req *req;
 111         struct wb_child_request_state *state;
 112
 113         req = tevent_req_create(mem_ctx, &state,
 114                                 struct wb_child_request_state);
 115         if (req == NULL) {
 116                 return NULL;
 117         }
 118
 119         state->ev = ev;
 120         state->child = child;
 121         state->request = request;
 122
 123         if (!tevent_queue_add(child->queue, ev, req,
 124                               wb_child_request_trigger, NULL)) {
 125                 tevent_req_nomem(NULL, req);
 126                 return tevent_req_post(req, ev);
 127         }
 128         return req;
 129 }
 130
 131 static void wb_child_request_trigger(struct tevent_req *req,
 132                                      void *private_data)
 133 {
 134         struct wb_child_request_state *state = tevent_req_data(
 135                 req, struct wb_child_request_state);
 136         struct tevent_req *subreq;
 137
 138         if ((state->child->pid == 0) && (!fork_domain_child(state->child))) {
 139                 tevent_req_error(req, errno);
 140                 return;
 141         }
 142
 143         subreq = wb_simple_trans_send(state, winbind_event_context(), NULL,
 144                                       state->child->sock, state->request);
 145         if (tevent_req_nomem(subreq, req)) {
 146                 return;
 147         }
 148         tevent_req_set_callback(subreq, wb_child_request_done, req);
 149
 150         if (!tevent_req_set_endtime(req, state->ev,
 151                                     timeval_current_ofs(300, 0))) {
 152                 tevent_req_nomem(NULL, req);
 153                 return;
 154         }
 155 }
 156
 157 static void wb_child_request_done(struct tevent_req *subreq)
 158 {
 159         struct tevent_req *req = tevent_req_callback_data(
 160                 subreq, struct tevent_req);
 161         struct wb_child_request_state *state = tevent_req_data(
 162                 req, struct wb_child_request_state);
 163         int ret, err;
 164
 165         ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
 166         TALLOC_FREE(subreq);
 167         if (ret == -1) {
 168                 tevent_req_error(req, err);
 169                 return;
 170         }
 171         tevent_req_done(req);
 172 }
 173
 174 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 175                           struct winbindd_response **presponse, int *err)
 176 {
 177         struct wb_child_request_state *state = tevent_req_data(
 178                 req, struct wb_child_request_state);
 179
 180         if (tevent_req_is_unix_error(req, err)) {
 181                 return -1;
 182         }
 183         *presponse = talloc_move(mem_ctx, &state->response);
 184         return 0;
 185 }
 186
 187 struct wb_domain_request_state {
 188         struct tevent_context *ev;
 189         struct winbindd_domain *domain;
 190         struct winbindd_request *request;
 191         struct winbindd_request *init_req;
 192         struct winbindd_response *response;
 193 };
 194
 195 static void wb_domain_request_gotdc(struct tevent_req *subreq);
 196 static void wb_domain_request_initialized(struct tevent_req *subreq);
 197 static void wb_domain_request_done(struct tevent_req *subreq);
 198
 199 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
 200                                           struct tevent_context *ev,
 201                                           struct winbindd_domain *domain,
 202                                           struct winbindd_request *request)
 203 {
 204         struct tevent_req *req, *subreq;
 205         struct wb_domain_request_state *state;
 206
 207         req = tevent_req_create(mem_ctx, &state,
 208                                 struct wb_domain_request_state);
 209         if (req == NULL) {
 210                 return NULL;
 211         }
 212
 213         if (domain->initialized) {
 214                 subreq = wb_child_request_send(state, ev, &domain->child,
 215                                                request);
 216                 if (tevent_req_nomem(subreq, req)) {
 217                         return tevent_req_post(req, ev);
 218                 }
 219                 tevent_req_set_callback(subreq, wb_domain_request_done, req);
 220                 return req;
 221         }
 222
 223         state->domain = domain;
 224         state->ev = ev;
 225         state->request = request;
 226
 227         state->init_req = talloc_zero(state, struct winbindd_request);
 228         if (tevent_req_nomem(state->init_req, req)) {
 229                 return tevent_req_post(req, ev);
 230         }
 231
 232         if (IS_DC || domain->primary || domain->internal) {
 233                 /* The primary domain has to find the DC name itself */
 234                 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 235                 fstrcpy(state->init_req->domain_name, domain->name);
 236                 state->init_req->data.init_conn.is_primary =
 237                         domain->primary ? true : false;
 238                 fstrcpy(state->init_req->data.init_conn.dcname, "");
 239
 240                 subreq = wb_child_request_send(state, ev, &domain->child,
 241                                                state->init_req);
 242                 if (tevent_req_nomem(subreq, req)) {
 243                         return tevent_req_post(req, ev);
 244                 }
 245                 tevent_req_set_callback(subreq, wb_domain_request_initialized,
 246                                         req);
 247                 return req;
 248         }
 249
 250         /*
 251          * Ask our DC for a DC name
 252          */
 253         domain = find_our_domain();
 254
 255         /* This is *not* the primary domain, let's ask our DC about a DC
 256          * name */
 257
 258         state->init_req->cmd = WINBINDD_GETDCNAME;
 259         fstrcpy(state->init_req->domain_name, domain->name);
 260
 261         subreq = wb_child_request_send(state, ev, &domain->child, request);
 262         if (tevent_req_nomem(subreq, req)) {
 263                 return tevent_req_post(req, ev);
 264         }
 265         tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
 266         return req;
 267 }
 268
 269 static void wb_domain_request_gotdc(struct tevent_req *subreq)
 270 {
 271         struct tevent_req *req = tevent_req_callback_data(
 272                 subreq, struct tevent_req);
 273         struct wb_domain_request_state *state = tevent_req_data(
 274                 req, struct wb_domain_request_state);
 275         struct winbindd_response *response;
 276         int ret, err;
 277
 278         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 279         TALLOC_FREE(subreq);
 280         if (ret == -1) {
 281                 tevent_req_error(req, err);
 282                 return;
 283         }
 284         state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 285         fstrcpy(state->init_req->domain_name, state->domain->name);
 286         state->init_req->data.init_conn.is_primary = False;
 287         fstrcpy(state->init_req->data.init_conn.dcname,
 288                 response->data.dc_name);
 289
 290         TALLOC_FREE(response);
 291
 292         subreq = wb_child_request_send(state, state->ev, &state->domain->child,
 293                                        state->init_req);
 294         if (tevent_req_nomem(subreq, req)) {
 295                 return;
 296         }
 297         tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
 298 }
 299
 300 static void wb_domain_request_initialized(struct tevent_req *subreq)
 301 {
 302         struct tevent_req *req = tevent_req_callback_data(
 303                 subreq, struct tevent_req);
 304         struct wb_domain_request_state *state = tevent_req_data(
 305                 req, struct wb_domain_request_state);
 306         struct winbindd_response *response;
 307         int ret, err;
 308
 309         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 310         TALLOC_FREE(subreq);
 311         if (ret == -1) {
 312                 tevent_req_error(req, err);
 313                 return;
 314         }
 315
 316         if (!string_to_sid(&state->domain->sid,
 317                            response->data.domain_info.sid)) {
 318                 DEBUG(1,("init_child_recv: Could not convert sid %s "
 319                         "from string\n", response->data.domain_info.sid));
 320                 tevent_req_error(req, EINVAL);
 321                 return;
 322         }
 323         fstrcpy(state->domain->name, response->data.domain_info.name);
 324         fstrcpy(state->domain->alt_name, response->data.domain_info.alt_name);
 325         state->domain->native_mode = response->data.domain_info.native_mode;
 326         state->domain->active_directory =
 327                 response->data.domain_info.active_directory;
 328         state->domain->initialized = true;
 329
 330         TALLOC_FREE(response);
 331
 332         subreq = wb_child_request_send(state, state->ev, &state->domain->child,
 333                                        state->request);
 334         if (tevent_req_nomem(subreq, req)) {
 335                 return;
 336         }
 337         tevent_req_set_callback(subreq, wb_domain_request_done, req);
 338 }
 339
 340 static void wb_domain_request_done(struct tevent_req *subreq)
 341 {
 342         struct tevent_req *req = tevent_req_callback_data(
 343                 subreq, struct tevent_req);
 344         struct wb_domain_request_state *state = tevent_req_data(
 345                 req, struct wb_domain_request_state);
 346         int ret, err;
 347
 348         ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
 349                                     &err);
 350         TALLOC_FREE(subreq);
 351         if (ret == -1) {
 352                 tevent_req_error(req, err);
 353                 return;
 354         }
 355         tevent_req_done(req);
 356 }
 357
 358 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 359                            struct winbindd_response **presponse, int *err)
 360 {
 361         struct wb_domain_request_state *state = tevent_req_data(
 362                 req, struct wb_domain_request_state);
 363
 364         if (tevent_req_is_unix_error(req, err)) {
 365                 return -1;
 366         }
 367         *presponse = talloc_move(mem_ctx, &state->response);
 368         return 0;
 369 }
 370
 371 static void child_process_request(struct winbindd_child *child,
 372                                   struct winbindd_cli_state *state)
 373 {
 374         struct winbindd_domain *domain = child->domain;
 375         const struct winbindd_child_dispatch_table *table = child->table;
 376
 377         /* Free response data - we may be interrupted and receive another
 378            command before being able to send this data off. */
 379
 380         state->response->result = WINBINDD_ERROR;
 381         state->response->length = sizeof(struct winbindd_response);
 382
 383         /* as all requests in the child are sync, we can use talloc_tos() */
 384         state->mem_ctx = talloc_tos();
 385
 386         /* Process command */
 387
 388         for (; table->name; table++) {
 389                 if (state->request->cmd == table->struct_cmd) {
 390                         DEBUG(10,("child_process_request: request fn %s\n",
 391                                   table->name));
 392                         state->response->result = table->struct_fn(domain, state);
 393                         return;
 394                 }
 395         }
 396
 397         DEBUG(1 ,("child_process_request: unknown request fn number %d\n",
 398                   (int)state->request->cmd));
 399         state->response->result = WINBINDD_ERROR;
 400 }
 401
 402 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 403                  const struct winbindd_child_dispatch_table *table,
 404                  const char *logprefix,
 405                  const char *logname)
 406 {
 407         if (logprefix && logname) {
 408                 if (asprintf(&child->logfilename, "%s/%s-%s",
 409                              get_dyn_LOGFILEBASE(), logprefix, logname) < 0) {
 410                         smb_panic("Internal error: asprintf failed");
 411                 }
 412         } else {
 413                 smb_panic("Internal error: logprefix == NULL && "
 414                           "logname == NULL");
 415         }
 416
 417         child->domain = domain;
 418         child->table = table;
 419         child->queue = tevent_queue_create(NULL, "winbind_child");
 420         SMB_ASSERT(child->queue != NULL);
 421         child->rpccli = wbint_rpccli_create(NULL, domain, child);
 422         SMB_ASSERT(child->rpccli != NULL);
 423 }
 424
 425 static struct winbindd_child *winbindd_children = NULL;
 426
 427 void winbind_child_died(pid_t pid)
 428 {
 429         struct winbindd_child *child;
 430
 431         for (child = winbindd_children; child != NULL; child = child->next) {
 432                 if (child->pid == pid) {
 433                         break;
 434                 }
 435         }
 436
 437         if (child == NULL) {
 438                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 439                 return;
 440         }
 441
 442         /* This will be re-added in fork_domain_child() */
 443
 444         DLIST_REMOVE(winbindd_children, child);
 445
 446         close(child->sock);
 447         child->sock = -1;
 448         child->pid = 0;
 449 }
 450
 451 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 452
 453 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 454 {
 455         flush_negative_conn_cache_for_domain(domain->name);
 456         if (*domain->alt_name) {
 457                 flush_negative_conn_cache_for_domain(domain->alt_name);
 458         }
 459 }
 460
 461 /*
 462  * Parent winbindd process sets its own debug level first and then
 463  * sends a message to all the winbindd children to adjust their debug
 464  * level to that of parents.
 465  */
 466
 467 void winbind_msg_debug(struct messaging_context *msg_ctx,
 468                          void *private_data,
 469                          uint32_t msg_type,
 470                          struct server_id server_id,
 471                          DATA_BLOB *data)
 472 {
 473         struct winbindd_child *child;
 474
 475         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 476
 477         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 478
 479         for (child = winbindd_children; child != NULL; child = child->next) {
 480
 481                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 482                         (unsigned int)child->pid));
 483
 484                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 485                            MSG_DEBUG,
 486                            data->data,
 487                            strlen((char *) data->data) + 1);
 488         }
 489 }
 490
 491 /* Set our domains as offline and forward the offline message to our children. */
 492
 493 void winbind_msg_offline(struct messaging_context *msg_ctx,
 494                          void *private_data,
 495                          uint32_t msg_type,
 496                          struct server_id server_id,
 497                          DATA_BLOB *data)
 498 {
 499         struct winbindd_child *child;
 500         struct winbindd_domain *domain;
 501
 502         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 503
 504         if (!lp_winbind_offline_logon()) {
 505                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 506                 return;
 507         }
 508
 509         /* Set our global state as offline. */
 510         if (!set_global_winbindd_state_offline()) {
 511                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 512                 return;
 513         }
 514
 515         /* Set all our domains as offline. */
 516         for (domain = domain_list(); domain; domain = domain->next) {
 517                 if (domain->internal) {
 518                         continue;
 519                 }
 520                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 521                 set_domain_offline(domain);
 522         }
 523
 524         for (child = winbindd_children; child != NULL; child = child->next) {
 525                 /* Don't send message to internal children.  We've already
 526                    done so above. */
 527                 if (!child->domain || winbindd_internal_child(child)) {
 528                         continue;
 529                 }
 530
 531                 /* Or internal domains (this should not be possible....) */
 532                 if (child->domain->internal) {
 533                         continue;
 534                 }
 535
 536                 /* Each winbindd child should only process requests for one domain - make sure
 537                    we only set it online / offline for that domain. */
 538
 539                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 540                         (unsigned int)child->pid, domain->name ));
 541
 542                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 543                                    MSG_WINBIND_OFFLINE,
 544                                    (uint8 *)child->domain->name,
 545                                    strlen(child->domain->name)+1);
 546         }
 547 }
 548
 549 /* Set our domains as online and forward the online message to our children. */
 550
 551 void winbind_msg_online(struct messaging_context *msg_ctx,
 552                         void *private_data,
 553                         uint32_t msg_type,
 554                         struct server_id server_id,
 555                         DATA_BLOB *data)
 556 {
 557         struct winbindd_child *child;
 558         struct winbindd_domain *domain;
 559
 560         DEBUG(10,("winbind_msg_online: got online message.\n"));
 561
 562         if (!lp_winbind_offline_logon()) {
 563                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 564                 return;
 565         }
 566
 567         /* Set our global state as online. */
 568         set_global_winbindd_state_online();
 569
 570         smb_nscd_flush_user_cache();
 571         smb_nscd_flush_group_cache();
 572
 573         /* Set all our domains as online. */
 574         for (domain = domain_list(); domain; domain = domain->next) {
 575                 if (domain->internal) {
 576                         continue;
 577                 }
 578                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 579
 580                 winbindd_flush_negative_conn_cache(domain);
 581                 set_domain_online_request(domain);
 582
 583                 /* Send an online message to the idmap child when our
 584                    primary domain comes back online */
 585
 586                 if ( domain->primary ) {
 587                         struct winbindd_child *idmap = idmap_child();
 588
 589                         if ( idmap->pid != 0 ) {
 590                                 messaging_send_buf(msg_ctx,
 591                                                    pid_to_procid(idmap->pid),
 592                                                    MSG_WINBIND_ONLINE,
 593                                                    (uint8 *)domain->name,
 594                                                    strlen(domain->name)+1);
 595                         }
 596                 }
 597         }
 598
 599         for (child = winbindd_children; child != NULL; child = child->next) {
 600                 /* Don't send message to internal childs. */
 601                 if (!child->domain || winbindd_internal_child(child)) {
 602                         continue;
 603                 }
 604
 605                 /* Or internal domains (this should not be possible....) */
 606                 if (child->domain->internal) {
 607                         continue;
 608                 }
 609
 610                 /* Each winbindd child should only process requests for one domain - make sure
 611                    we only set it online / offline for that domain. */
 612
 613                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 614                         (unsigned int)child->pid, child->domain->name ));
 615
 616                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 617                                    MSG_WINBIND_ONLINE,
 618                                    (uint8 *)child->domain->name,
 619                                    strlen(child->domain->name)+1);
 620         }
 621 }
 622
 623 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 624 {
 625         struct winbindd_domain *domain;
 626         char *buf = NULL;
 627
 628         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 629                                    get_global_winbindd_state_offline() ?
 630                                    "Offline":"Online")) == NULL) {
 631                 return NULL;
 632         }
 633
 634         for (domain = domain_list(); domain; domain = domain->next) {
 635                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 636                                                   domain->name,
 637                                                   domain->online ?
 638                                                   "Online":"Offline")) == NULL) {
 639                         return NULL;
 640                 }
 641         }
 642
 643         buf = talloc_asprintf_append_buffer(buf, "\n");
 644
 645         DEBUG(5,("collect_onlinestatus: %s", buf));
 646
 647         return buf;
 648 }
 649
 650 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 651                               void *private_data,
 652                               uint32_t msg_type,
 653                               struct server_id server_id,
 654                               DATA_BLOB *data)
 655 {
 656         TALLOC_CTX *mem_ctx;
 657         const char *message;
 658         struct server_id *sender;
 659
 660         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 661
 662         if (!data->data) {
 663                 return;
 664         }
 665
 666         sender = (struct server_id *)data->data;
 667
 668         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 669         if (mem_ctx == NULL) {
 670                 return;
 671         }
 672
 673         message = collect_onlinestatus(mem_ctx);
 674         if (message == NULL) {
 675                 talloc_destroy(mem_ctx);
 676                 return;
 677         }
 678
 679         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 680                            (uint8 *)message, strlen(message) + 1);
 681
 682         talloc_destroy(mem_ctx);
 683 }
 684
 685 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 686                                  void *private_data,
 687                                  uint32_t msg_type,
 688                                  struct server_id server_id,
 689                                  DATA_BLOB *data)
 690 {
 691         struct winbindd_child *child;
 692
 693         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 694
 695         dump_event_list(winbind_event_context());
 696
 697         for (child = winbindd_children; child != NULL; child = child->next) {
 698
 699                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 700                         (unsigned int)child->pid));
 701
 702                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 703                                    MSG_DUMP_EVENT_LIST,
 704                                    NULL, 0);
 705         }
 706
 707 }
 708
 709 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 710                                   void *private_data,
 711                                   uint32_t msg_type,
 712                                   struct server_id server_id,
 713                                   DATA_BLOB *data)
 714 {
 715         TALLOC_CTX *mem_ctx;
 716         const char *message = NULL;
 717         struct server_id *sender = NULL;
 718         const char *domain = NULL;
 719         char *s = NULL;
 720         NTSTATUS status;
 721         struct winbindd_domain *dom = NULL;
 722
 723         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 724
 725         if (!data || !data->data) {
 726                 return;
 727         }
 728
 729         if (data->length < sizeof(struct server_id)) {
 730                 return;
 731         }
 732
 733         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 734         if (!mem_ctx) {
 735                 return;
 736         }
 737
 738         sender = (struct server_id *)data->data;
 739         if (data->length > sizeof(struct server_id)) {
 740                 domain = (const char *)data->data+sizeof(struct server_id);
 741         }
 742
 743         if (domain) {
 744
 745                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 746                         domain));
 747
 748                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 749                                                   find_domain_from_name_noinit(domain));
 750                 if (!message) {
 751                         talloc_destroy(mem_ctx);
 752                         return;
 753                 }
 754
 755                 messaging_send_buf(msg_ctx, *sender,
 756                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 757                                    (uint8_t *)message, strlen(message) + 1);
 758
 759                 talloc_destroy(mem_ctx);
 760
 761                 return;
 762         }
 763
 764         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 765
 766         for (dom = domain_list(); dom; dom=dom->next) {
 767                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 768                 if (!message) {
 769                         talloc_destroy(mem_ctx);
 770                         return;
 771                 }
 772
 773                 s = talloc_asprintf_append(s, "%s\n", message);
 774                 if (!s) {
 775                         talloc_destroy(mem_ctx);
 776                         return;
 777                 }
 778         }
 779
 780         status = messaging_send_buf(msg_ctx, *sender,
 781                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 782                                     (uint8_t *)s, strlen(s) + 1);
 783         if (!NT_STATUS_IS_OK(status)) {
 784                 DEBUG(0,("failed to send message: %s\n",
 785                 nt_errstr(status)));
 786         }
 787
 788         talloc_destroy(mem_ctx);
 789 }
 790
 791 static void account_lockout_policy_handler(struct event_context *ctx,
 792                                            struct timed_event *te,
 793                                            struct timeval now,
 794                                            void *private_data)
 795 {
 796         struct winbindd_child *child =
 797                 (struct winbindd_child *)private_data;
 798         TALLOC_CTX *mem_ctx = NULL;
 799         struct winbindd_methods *methods;
 800         struct samr_DomInfo12 lockout_policy;
 801         NTSTATUS result;
 802
 803         DEBUG(10,("account_lockout_policy_handler called\n"));
 804
 805         TALLOC_FREE(child->lockout_policy_event);
 806
 807         if ( !winbindd_can_contact_domain( child->domain ) ) {
 808                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 809                           "do not have an incoming trust to domain %s\n",
 810                           child->domain->name));
 811
 812                 return;
 813         }
 814
 815         methods = child->domain->methods;
 816
 817         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 818         if (!mem_ctx) {
 819                 result = NT_STATUS_NO_MEMORY;
 820         } else {
 821                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 822         }
 823         TALLOC_FREE(mem_ctx);
 824
 825         if (!NT_STATUS_IS_OK(result)) {
 826                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 827                          nt_errstr(result)));
 828         }
 829
 830         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 831                                                       timeval_current_ofs(3600, 0),
 832                                                       account_lockout_policy_handler,
 833                                                       child);
 834 }
 835
 836 static time_t get_machine_password_timeout(void)
 837 {
 838         /* until we have gpo support use lp setting */
 839         return lp_machine_password_timeout();
 840 }
 841
 842 static bool calculate_next_machine_pwd_change(const char *domain,
 843                                               struct timeval *t)
 844 {
 845         time_t pass_last_set_time;
 846         time_t timeout;
 847         time_t next_change;
 848         struct timeval tv;
 849         char *pw;
 850
 851         pw = secrets_fetch_machine_password(domain,
 852                                             &pass_last_set_time,
 853                                             NULL);
 854
 855         if (pw == NULL) {
 856                 DEBUG(0,("cannot fetch own machine password ????"));
 857                 return false;
 858         }
 859
 860         SAFE_FREE(pw);
 861
 862         timeout = get_machine_password_timeout();
 863         if (timeout == 0) {
 864                 DEBUG(10,("machine password never expires\n"));
 865                 return false;
 866         }
 867
 868         tv.tv_sec = pass_last_set_time;
 869         DEBUG(10, ("password last changed %s\n",
 870                    timeval_string(talloc_tos(), &tv, false)));
 871         tv.tv_sec += timeout;
 872         DEBUGADD(10, ("password valid until %s\n",
 873                       timeval_string(talloc_tos(), &tv, false)));
 874
 875         if (time(NULL) < (pass_last_set_time + timeout)) {
 876                 next_change = pass_last_set_time + timeout;
 877                 DEBUG(10,("machine password still valid until: %s\n",
 878                         http_timestring(talloc_tos(), next_change)));
 879                 *t = timeval_set(next_change, 0);
 880
 881                 if (lp_clustering()) {
 882                         uint8_t randbuf;
 883                         /*
 884                          * When having a cluster, we have several
 885                          * winbinds racing for the password change. In
 886                          * the machine_password_change_handler()
 887                          * function we check if someone else was
 888                          * faster when the event triggers. We add a
 889                          * 255-second random delay here, so that we
 890                          * don't run to change the password at the
 891                          * exact same moment.
 892                          */
 893                         generate_random_buffer(&randbuf, sizeof(randbuf));
 894                         DEBUG(10, ("adding %d seconds randomness\n",
 895                                    (int)randbuf));
 896                         t->tv_sec += randbuf;
 897                 }
 898                 return true;
 899         }
 900
 901         DEBUG(10,("machine password expired, needs immediate change\n"));
 902
 903         *t = timeval_zero();
 904
 905         return true;
 906 }
 907
 908 static void machine_password_change_handler(struct event_context *ctx,
 909                                             struct timed_event *te,
 910                                             struct timeval now,
 911                                             void *private_data)
 912 {
 913         struct winbindd_child *child =
 914                 (struct winbindd_child *)private_data;
 915         struct rpc_pipe_client *netlogon_pipe = NULL;
 916         TALLOC_CTX *frame;
 917         NTSTATUS result;
 918         struct timeval next_change;
 919
 920         DEBUG(10,("machine_password_change_handler called\n"));
 921
 922         TALLOC_FREE(child->machine_password_change_event);
 923
 924         if (!calculate_next_machine_pwd_change(child->domain->name,
 925                                                &next_change)) {
 926                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
 927                 return;
 928         }
 929
 930         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
 931                    timeval_string(talloc_tos(), &next_change, false)));
 932
 933         if (!timeval_expired(&next_change)) {
 934                 DEBUG(10, ("Someone else has already changed the pw\n"));
 935                 goto done;
 936         }
 937
 938         if (!winbindd_can_contact_domain(child->domain)) {
 939                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
 940                           "do not have an incoming trust to domain %s\n",
 941                           child->domain->name));
 942                 return;
 943         }
 944
 945         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
 946         if (!NT_STATUS_IS_OK(result)) {
 947                 DEBUG(10,("machine_password_change_handler: "
 948                         "failed to connect netlogon pipe: %s\n",
 949                          nt_errstr(result)));
 950                 return;
 951         }
 952
 953         frame = talloc_stackframe();
 954
 955         result = trust_pw_find_change_and_store_it(netlogon_pipe,
 956                                                    frame,
 957                                                    child->domain->name);
 958         TALLOC_FREE(frame);
 959
 960         DEBUG(10, ("machine_password_change_handler: "
 961                    "trust_pw_find_change_and_store_it returned %s\n",
 962                    nt_errstr(result)));
 963
 964         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
 965                 DEBUG(3,("machine_password_change_handler: password set returned "
 966                          "ACCESS_DENIED.  Maybe the trust account "
 967                          "password was changed and we didn't know it. "
 968                          "Killing connections to domain %s\n",
 969                          child->domain->name));
 970                 TALLOC_FREE(child->domain->conn.netlogon_pipe);
 971         }
 972
 973         if (!calculate_next_machine_pwd_change(child->domain->name,
 974                                                &next_change)) {
 975                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
 976                 return;
 977         }
 978
 979         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
 980                    timeval_string(talloc_tos(), &next_change, false)));
 981
 982         if (!NT_STATUS_IS_OK(result)) {
 983                 struct timeval tmp;
 984                 /*
 985                  * In case of failure, give the DC a minute to recover
 986                  */
 987                 tmp = timeval_current_ofs(60, 0);
 988                 next_change = timeval_max(&next_change, &tmp);
 989         }
 990
 991 done:
 992         child->machine_password_change_event = event_add_timed(winbind_event_context(), NULL,
 993                                                               next_change,
 994                                                               machine_password_change_handler,
 995                                                               child);
 996 }
 997
 998 /* Deal with a request to go offline. */
 999
1000 static void child_msg_offline(struct messaging_context *msg,
1001                               void *private_data,
1002                               uint32_t msg_type,
1003                               struct server_id server_id,
1004                               DATA_BLOB *data)
1005 {
1006         struct winbindd_domain *domain;
1007         struct winbindd_domain *primary_domain = NULL;
1008         const char *domainname = (const char *)data->data;
1009
1010         if (data->data == NULL || data->length == 0) {
1011                 return;
1012         }
1013
1014         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1015
1016         if (!lp_winbind_offline_logon()) {
1017                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1018                 return;
1019         }
1020
1021         primary_domain = find_our_domain();
1022
1023         /* Mark the requested domain offline. */
1024
1025         for (domain = domain_list(); domain; domain = domain->next) {
1026                 if (domain->internal) {
1027                         continue;
1028                 }
1029                 if (strequal(domain->name, domainname)) {
1030                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1031                         set_domain_offline(domain);
1032                         /* we are in the trusted domain, set the primary domain
1033                          * offline too */
1034                         if (domain != primary_domain) {
1035                                 set_domain_offline(primary_domain);
1036                         }
1037                 }
1038         }
1039 }
1040
1041 /* Deal with a request to go online. */
1042
1043 static void child_msg_online(struct messaging_context *msg,
1044                              void *private_data,
1045                              uint32_t msg_type,
1046                              struct server_id server_id,
1047                              DATA_BLOB *data)
1048 {
1049         struct winbindd_domain *domain;
1050         struct winbindd_domain *primary_domain = NULL;
1051         const char *domainname = (const char *)data->data;
1052
1053         if (data->data == NULL || data->length == 0) {
1054                 return;
1055         }
1056
1057         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1058
1059         if (!lp_winbind_offline_logon()) {
1060                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1061                 return;
1062         }
1063
1064         primary_domain = find_our_domain();
1065
1066         /* Set our global state as online. */
1067         set_global_winbindd_state_online();
1068
1069         /* Try and mark everything online - delete any negative cache entries
1070            to force a reconnect now. */
1071
1072         for (domain = domain_list(); domain; domain = domain->next) {
1073                 if (domain->internal) {
1074                         continue;
1075                 }
1076                 if (strequal(domain->name, domainname)) {
1077                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1078                         winbindd_flush_negative_conn_cache(domain);
1079                         set_domain_online_request(domain);
1080
1081                         /* we can be in trusted domain, which will contact primary domain
1082                          * we have to bring primary domain online in trusted domain process
1083                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1084                          * --> contact_domain = find_our_domain()
1085                          * */
1086                         if (domain != primary_domain) {
1087                                 winbindd_flush_negative_conn_cache(primary_domain);
1088                                 set_domain_online_request(primary_domain);
1089                         }
1090                 }
1091         }
1092 }
1093
1094 static void child_msg_dump_event_list(struct messaging_context *msg,
1095                                       void *private_data,
1096                                       uint32_t msg_type,
1097                                       struct server_id server_id,
1098                                       DATA_BLOB *data)
1099 {
1100         DEBUG(5,("child_msg_dump_event_list received\n"));
1101
1102         dump_event_list(winbind_event_context());
1103 }
1104
1105 bool winbindd_reinit_after_fork(const char *logfilename)
1106 {
1107         struct winbindd_domain *domain;
1108         struct winbindd_child *cl;
1109         NTSTATUS status;
1110
1111         status = reinit_after_fork(winbind_messaging_context(),
1112                                    winbind_event_context(),
1113                                    procid_self(), true);
1114         if (!NT_STATUS_IS_OK(status)) {
1115                 DEBUG(0,("reinit_after_fork() failed\n"));
1116                 return false;
1117         }
1118
1119         close_conns_after_fork();
1120
1121         if (!override_logfile && logfilename) {
1122                 lp_set_logfile(logfilename);
1123                 reopen_logs();
1124         }
1125
1126         if (!winbindd_setup_sig_term_handler(false))
1127                 return false;
1128         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1129                                             logfilename))
1130                 return false;
1131
1132         /* Stop zombies in children */
1133         CatchChild();
1134
1135         /* Don't handle the same messages as our parent. */
1136         messaging_deregister(winbind_messaging_context(),
1137                              MSG_SMB_CONF_UPDATED, NULL);
1138         messaging_deregister(winbind_messaging_context(),
1139                              MSG_SHUTDOWN, NULL);
1140         messaging_deregister(winbind_messaging_context(),
1141                              MSG_WINBIND_OFFLINE, NULL);
1142         messaging_deregister(winbind_messaging_context(),
1143                              MSG_WINBIND_ONLINE, NULL);
1144         messaging_deregister(winbind_messaging_context(),
1145                              MSG_WINBIND_ONLINESTATUS, NULL);
1146         messaging_deregister(winbind_messaging_context(),
1147                              MSG_DUMP_EVENT_LIST, NULL);
1148         messaging_deregister(winbind_messaging_context(),
1149                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1150         messaging_deregister(winbind_messaging_context(),
1151                              MSG_DEBUG, NULL);
1152
1153         /* We have destroyed all events in the winbindd_event_context
1154          * in reinit_after_fork(), so clean out all possible pending
1155          * event pointers. */
1156
1157         /* Deal with check_online_events. */
1158
1159         for (domain = domain_list(); domain; domain = domain->next) {
1160                 TALLOC_FREE(domain->check_online_event);
1161         }
1162
1163         /* Ensure we're not handling a credential cache event inherited
1164          * from our parent. */
1165
1166         ccache_remove_all_after_fork();
1167
1168         /* Destroy all possible events in child list. */
1169         for (cl = winbindd_children; cl != NULL; cl = cl->next) {
1170                 TALLOC_FREE(cl->lockout_policy_event);
1171                 TALLOC_FREE(cl->machine_password_change_event);
1172
1173                 /* Children should never be able to send
1174                  * each other messages, all messages must
1175                  * go through the parent.
1176                  */
1177                 cl->pid = (pid_t)0;
1178         }
1179         /*
1180          * This is a little tricky, children must not
1181          * send an MSG_WINBIND_ONLINE message to idmap_child().
1182          * If we are in a child of our primary domain or
1183          * in the process created by fork_child_dc_connect(),
1184          * and the primary domain cannot go online,
1185          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1186          * periodically to idmap_child().
1187          *
1188          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1189          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1190          * ---> init_dc_connection() ---> cm_open_connection --->
1191          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1192          * idmap_child(). Disallow children sending messages
1193          * to each other, all messages must go through the parent.
1194          */
1195         cl = idmap_child();
1196         cl->pid = (pid_t)0;
1197
1198         return true;
1199 }
1200
1201 /*
1202  * In a child there will be only one domain, reference that here.
1203  */
1204 static struct winbindd_domain *child_domain;
1205
1206 struct winbindd_domain *wb_child_domain(void)
1207 {
1208         return child_domain;
1209 }
1210
1211 static bool fork_domain_child(struct winbindd_child *child)
1212 {
1213         int fdpair[2];
1214         struct winbindd_cli_state state;
1215         struct winbindd_request request;
1216         struct winbindd_response response;
1217         struct winbindd_domain *primary_domain = NULL;
1218
1219         if (child->domain) {
1220                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1221                            child->domain->name));
1222         } else {
1223                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1224         }
1225
1226         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1227                 DEBUG(0, ("Could not open child pipe: %s\n",
1228                           strerror(errno)));
1229                 return False;
1230         }
1231
1232         ZERO_STRUCT(state);
1233         state.pid = sys_getpid();
1234         state.request = &request;
1235         state.response = &response;
1236
1237         child->pid = sys_fork();
1238
1239         if (child->pid == -1) {
1240                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1241                 return False;
1242         }
1243
1244         if (child->pid != 0) {
1245                 /* Parent */
1246                 close(fdpair[0]);
1247                 child->next = child->prev = NULL;
1248                 DLIST_ADD(winbindd_children, child);
1249                 child->sock = fdpair[1];
1250                 return True;
1251         }
1252
1253         /* Child */
1254         child_domain = child->domain;
1255
1256         DEBUG(10, ("Child process %d\n", (int)sys_getpid()));
1257
1258         state.sock = fdpair[0];
1259         close(fdpair[1]);
1260
1261         if (!winbindd_reinit_after_fork(child->logfilename)) {
1262                 _exit(0);
1263         }
1264
1265         /* Handle online/offline messages. */
1266         messaging_register(winbind_messaging_context(), NULL,
1267                            MSG_WINBIND_OFFLINE, child_msg_offline);
1268         messaging_register(winbind_messaging_context(), NULL,
1269                            MSG_WINBIND_ONLINE, child_msg_online);
1270         messaging_register(winbind_messaging_context(), NULL,
1271                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1272         messaging_register(winbind_messaging_context(), NULL,
1273                            MSG_DEBUG, debug_message);
1274
1275         primary_domain = find_our_domain();
1276
1277         if (primary_domain == NULL) {
1278                 smb_panic("no primary domain found");
1279         }
1280
1281         /* It doesn't matter if we allow cache login,
1282          * try to bring domain online after fork. */
1283         if ( child->domain ) {
1284                 child->domain->startup = True;
1285                 child->domain->startup_time = time(NULL);
1286                 /* we can be in primary domain or in trusted domain
1287                  * If we are in trusted domain, set the primary domain
1288                  * in start-up mode */
1289                 if (!(child->domain->internal)) {
1290                         set_domain_online_request(child->domain);
1291                         if (!(child->domain->primary)) {
1292                                 primary_domain->startup = True;
1293                                 primary_domain->startup_time = time(NULL);
1294                                 set_domain_online_request(primary_domain);
1295                         }
1296                 }
1297         }
1298
1299         /*
1300          * We are in idmap child, make sure that we set the
1301          * check_online_event to bring primary domain online.
1302          */
1303         if (child == idmap_child()) {
1304                 set_domain_online_request(primary_domain);
1305         }
1306
1307         /* We might be in the idmap child...*/
1308         if (child->domain && !(child->domain->internal) &&
1309             lp_winbind_offline_logon()) {
1310
1311                 set_domain_online_request(child->domain);
1312
1313                 if (primary_domain && (primary_domain != child->domain)) {
1314                         /* We need to talk to the primary
1315                          * domain as well as the trusted
1316                          * domain inside a trusted domain
1317                          * child.
1318                          * See the code in :
1319                          * set_dc_type_and_flags_trustinfo()
1320                          * for details.
1321                          */
1322                         set_domain_online_request(primary_domain);
1323                 }
1324
1325                 child->lockout_policy_event = event_add_timed(
1326                         winbind_event_context(), NULL, timeval_zero(),
1327                         account_lockout_policy_handler,
1328                         child);
1329         }
1330
1331         if (child->domain && child->domain->primary &&
1332             !USE_KERBEROS_KEYTAB &&
1333             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1334
1335                 struct timeval next_change;
1336
1337                 if (calculate_next_machine_pwd_change(child->domain->name,
1338                                                        &next_change)) {
1339                         child->machine_password_change_event = event_add_timed(
1340                                 winbind_event_context(), NULL, next_change,
1341                                 machine_password_change_handler,
1342                                 child);
1343                 }
1344         }
1345
1346         while (1) {
1347
1348                 int ret;
1349                 fd_set r_fds;
1350                 fd_set w_fds;
1351                 int maxfd;
1352                 struct timeval t;
1353                 struct timeval *tp;
1354                 struct timeval now;
1355                 TALLOC_CTX *frame = talloc_stackframe();
1356                 struct iovec iov[2];
1357                 int iov_count;
1358                 NTSTATUS status;
1359
1360                 if (run_events(winbind_event_context(), 0, NULL, NULL)) {
1361                         TALLOC_FREE(frame);
1362                         continue;
1363                 }
1364
1365                 GetTimeOfDay(&now);
1366
1367                 if (child->domain && child->domain->startup &&
1368                                 (now.tv_sec > child->domain->startup_time + 30)) {
1369                         /* No longer in "startup" mode. */
1370                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1371                                 child->domain->name ));
1372                         child->domain->startup = False;
1373                 }
1374
1375                 FD_ZERO(&r_fds);
1376                 FD_ZERO(&w_fds);
1377                 FD_SET(state.sock, &r_fds);
1378                 maxfd = state.sock;
1379
1380                 /*
1381                  * Initialize this high as event_add_to_select_args()
1382                  * uses a timeval_min() on this and next_event. Fix
1383                  * from Roel van Meer <rolek@alt001.com>.
1384                  */
1385                 t.tv_sec = 999999;
1386                 t.tv_usec = 0;
1387
1388                 event_add_to_select_args(winbind_event_context(), &now,
1389                                          &r_fds, &w_fds, &t, &maxfd);
1390                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1391                 if (tp) {
1392                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1393                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1394                 }
1395
1396                 ret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, tp);
1397
1398                 if (run_events(winbind_event_context(), ret, &r_fds, &w_fds)) {
1399                         /* We got a signal - continue. */
1400                         TALLOC_FREE(frame);
1401                         continue;
1402                 }
1403
1404                 if (ret == 0) {
1405                         DEBUG(11,("nothing is ready yet, continue\n"));
1406                         TALLOC_FREE(frame);
1407                         continue;
1408                 }
1409
1410                 if (ret == -1 && errno == EINTR) {
1411                         /* We got a signal - continue. */
1412                         TALLOC_FREE(frame);
1413                         continue;
1414                 }
1415
1416                 if (ret == -1 && errno != EINTR) {
1417                         DEBUG(0,("select error occured\n"));
1418                         TALLOC_FREE(frame);
1419                         perror("select");
1420                         _exit(1);
1421                 }
1422
1423                 /* fetch a request from the main daemon */
1424                 status = child_read_request(&state);
1425
1426                 if (!NT_STATUS_IS_OK(status)) {
1427                         /* we lost contact with our parent */
1428                         _exit(0);
1429                 }
1430
1431                 DEBUG(4,("child daemon request %d\n", (int)state.request->cmd));
1432
1433                 ZERO_STRUCTP(state.response);
1434                 state.request->null_term = '\0';
1435                 state.mem_ctx = frame;
1436                 child_process_request(child, &state);
1437
1438                 DEBUG(4, ("Finished processing child request %d\n",
1439                           (int)state.request->cmd));
1440
1441                 SAFE_FREE(state.request->extra_data.data);
1442
1443                 iov[0].iov_base = (void *)state.response;
1444                 iov[0].iov_len = sizeof(struct winbindd_response);
1445                 iov_count = 1;
1446
1447                 if (state.response->length > sizeof(struct winbindd_response)) {
1448                         iov[1].iov_base =
1449                                 (void *)state.response->extra_data.data;
1450                         iov[1].iov_len = state.response->length-iov[0].iov_len;
1451                         iov_count = 2;
1452                 }
1453
1454                 DEBUG(10, ("Writing %d bytes to parent\n",
1455                            (int)state.response->length));
1456
1457                 if (write_data_iov(state.sock, iov, iov_count) !=
1458                     state.response->length) {
1459                         DEBUG(0, ("Could not write result\n"));
1460                         exit(1);
1461                 }
1462                 TALLOC_FREE(frame);
1463         }
1464 }