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
  34 #undef DBGC_CLASS
  35 #define DBGC_CLASS DBGC_WINBIND
  36
  37 extern bool override_logfile;
  38 extern struct winbindd_methods cache_methods;
  39
  40 /* Read some data from a client connection */
  41
  42 static NTSTATUS child_read_request(struct winbindd_cli_state *state)
  43 {
  44         NTSTATUS status;
  45
  46         /* Read data */
  47
  48         status = read_data(state->sock, (char *)state->request,
  49                            sizeof(*state->request));
  50
  51         if (!NT_STATUS_IS_OK(status)) {
  52                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  53                           nt_errstr(status)));
  54                 return status;
  55         }
  56
  57         if (state->request->extra_len == 0) {
  58                 state->request->extra_data.data = NULL;
  59                 return NT_STATUS_OK;
  60         }
  61
  62         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request->extra_len));
  63
  64         state->request->extra_data.data =
  65                 SMB_MALLOC_ARRAY(char, state->request->extra_len + 1);
  66
  67         if (state->request->extra_data.data == NULL) {
  68                 DEBUG(0, ("malloc failed\n"));
  69                 return NT_STATUS_NO_MEMORY;
  70         }
  71
  72         /* Ensure null termination */
  73         state->request->extra_data.data[state->request->extra_len] = '\0';
  74
  75         status= read_data(state->sock, state->request->extra_data.data,
  76                           state->request->extra_len);
  77
  78         if (!NT_STATUS_IS_OK(status)) {
  79                 DEBUG(0, ("Could not read extra data: %s\n",
  80                           nt_errstr(status)));
  81         }
  82         return status;
  83 }
  84
  85 /*
  86  * Do winbind child async request. This is not simply wb_simple_trans. We have
  87  * to do the queueing ourselves because while a request is queued, the child
  88  * might have crashed, and we have to re-fork it in the _trigger function.
  89  */
  90
  91 struct wb_child_request_state {
  92         struct tevent_context *ev;
  93         struct winbindd_child *child;
  94         struct winbindd_request *request;
  95         struct winbindd_response *response;
  96 };
  97
  98 static bool fork_domain_child(struct winbindd_child *child);
  99
 100 static void wb_child_request_trigger(struct tevent_req *req,
 101                                             void *private_data);
 102 static void wb_child_request_done(struct tevent_req *subreq);
 103
 104 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
 105                                          struct tevent_context *ev,
 106                                          struct winbindd_child *child,
 107                                          struct winbindd_request *request)
 108 {
 109         struct tevent_req *req;
 110         struct wb_child_request_state *state;
 111
 112         req = tevent_req_create(mem_ctx, &state,
 113                                 struct wb_child_request_state);
 114         if (req == NULL) {
 115                 return NULL;
 116         }
 117
 118         state->ev = ev;
 119         state->child = child;
 120         state->request = request;
 121
 122         if (!tevent_queue_add(child->queue, ev, req,
 123                               wb_child_request_trigger, NULL)) {
 124                 tevent_req_nomem(NULL, req);
 125                 return tevent_req_post(req, ev);
 126         }
 127         return req;
 128 }
 129
 130 static void wb_child_request_trigger(struct tevent_req *req,
 131                                      void *private_data)
 132 {
 133         struct wb_child_request_state *state = tevent_req_data(
 134                 req, struct wb_child_request_state);
 135         struct tevent_req *subreq;
 136
 137         if ((state->child->pid == 0) && (!fork_domain_child(state->child))) {
 138                 tevent_req_error(req, errno);
 139                 return;
 140         }
 141
 142         subreq = wb_simple_trans_send(state, winbind_event_context(), NULL,
 143                                       state->child->sock, state->request);
 144         if (tevent_req_nomem(subreq, req)) {
 145                 return;
 146         }
 147         tevent_req_set_callback(subreq, wb_child_request_done, req);
 148
 149         if (!tevent_req_set_endtime(req, state->ev,
 150                                     timeval_current_ofs(300, 0))) {
 151                 tevent_req_nomem(NULL, req);
 152                 return;
 153         }
 154 }
 155
 156 static void wb_child_request_done(struct tevent_req *subreq)
 157 {
 158         struct tevent_req *req = tevent_req_callback_data(
 159                 subreq, struct tevent_req);
 160         struct wb_child_request_state *state = tevent_req_data(
 161                 req, struct wb_child_request_state);
 162         int ret, err;
 163
 164         ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
 165         TALLOC_FREE(subreq);
 166         if (ret == -1) {
 167                 tevent_req_error(req, err);
 168                 return;
 169         }
 170         tevent_req_done(req);
 171 }
 172
 173 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 174                           struct winbindd_response **presponse, int *err)
 175 {
 176         struct wb_child_request_state *state = tevent_req_data(
 177                 req, struct wb_child_request_state);
 178
 179         if (tevent_req_is_unix_error(req, err)) {
 180                 return -1;
 181         }
 182         *presponse = talloc_move(mem_ctx, &state->response);
 183         return 0;
 184 }
 185
 186 struct wb_domain_request_state {
 187         struct tevent_context *ev;
 188         struct winbindd_domain *domain;
 189         struct winbindd_request *request;
 190         struct winbindd_request *init_req;
 191         struct winbindd_response *response;
 192 };
 193
 194 static void wb_domain_request_gotdc(struct tevent_req *subreq);
 195 static void wb_domain_request_initialized(struct tevent_req *subreq);
 196 static void wb_domain_request_done(struct tevent_req *subreq);
 197
 198 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
 199                                           struct tevent_context *ev,
 200                                           struct winbindd_domain *domain,
 201                                           struct winbindd_request *request)
 202 {
 203         struct tevent_req *req, *subreq;
 204         struct wb_domain_request_state *state;
 205
 206         req = tevent_req_create(mem_ctx, &state,
 207                                 struct wb_domain_request_state);
 208         if (req == NULL) {
 209                 return NULL;
 210         }
 211
 212         if (domain->initialized) {
 213                 subreq = wb_child_request_send(state, ev, &domain->child,
 214                                                request);
 215                 if (tevent_req_nomem(subreq, req)) {
 216                         return tevent_req_post(req, ev);
 217                 }
 218                 tevent_req_set_callback(subreq, wb_domain_request_done, req);
 219                 return req;
 220         }
 221
 222         state->domain = domain;
 223         state->ev = ev;
 224         state->request = request;
 225
 226         state->init_req = talloc_zero(state, struct winbindd_request);
 227         if (tevent_req_nomem(state->init_req, req)) {
 228                 return tevent_req_post(req, ev);
 229         }
 230
 231         if (IS_DC || domain->primary || domain->internal) {
 232                 /* The primary domain has to find the DC name itself */
 233                 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 234                 fstrcpy(state->init_req->domain_name, domain->name);
 235                 state->init_req->data.init_conn.is_primary =
 236                         domain->primary ? true : false;
 237                 fstrcpy(state->init_req->data.init_conn.dcname, "");
 238
 239                 subreq = wb_child_request_send(state, ev, &domain->child,
 240                                                state->init_req);
 241                 if (tevent_req_nomem(subreq, req)) {
 242                         return tevent_req_post(req, ev);
 243                 }
 244                 tevent_req_set_callback(subreq, wb_domain_request_initialized,
 245                                         req);
 246                 return req;
 247         }
 248
 249         /*
 250          * Ask our DC for a DC name
 251          */
 252         domain = find_our_domain();
 253
 254         /* This is *not* the primary domain, let's ask our DC about a DC
 255          * name */
 256
 257         state->init_req->cmd = WINBINDD_GETDCNAME;
 258         fstrcpy(state->init_req->domain_name, domain->name);
 259
 260         subreq = wb_child_request_send(state, ev, &domain->child, request);
 261         if (tevent_req_nomem(subreq, req)) {
 262                 return tevent_req_post(req, ev);
 263         }
 264         tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
 265         return req;
 266 }
 267
 268 static void wb_domain_request_gotdc(struct tevent_req *subreq)
 269 {
 270         struct tevent_req *req = tevent_req_callback_data(
 271                 subreq, struct tevent_req);
 272         struct wb_domain_request_state *state = tevent_req_data(
 273                 req, struct wb_domain_request_state);
 274         struct winbindd_response *response;
 275         int ret, err;
 276
 277         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 278         TALLOC_FREE(subreq);
 279         if (ret == -1) {
 280                 tevent_req_error(req, err);
 281                 return;
 282         }
 283         state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 284         fstrcpy(state->init_req->domain_name, state->domain->name);
 285         state->init_req->data.init_conn.is_primary = False;
 286         fstrcpy(state->init_req->data.init_conn.dcname,
 287                 response->data.dc_name);
 288
 289         TALLOC_FREE(response);
 290
 291         subreq = wb_child_request_send(state, state->ev, &state->domain->child,
 292                                        state->init_req);
 293         if (tevent_req_nomem(subreq, req)) {
 294                 return;
 295         }
 296         tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
 297 }
 298
 299 static void wb_domain_request_initialized(struct tevent_req *subreq)
 300 {
 301         struct tevent_req *req = tevent_req_callback_data(
 302                 subreq, struct tevent_req);
 303         struct wb_domain_request_state *state = tevent_req_data(
 304                 req, struct wb_domain_request_state);
 305         struct winbindd_response *response;
 306         int ret, err;
 307
 308         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 309         TALLOC_FREE(subreq);
 310         if (ret == -1) {
 311                 tevent_req_error(req, err);
 312                 return;
 313         }
 314
 315         if (!string_to_sid(&state->domain->sid,
 316                            response->data.domain_info.sid)) {
 317                 DEBUG(1,("init_child_recv: Could not convert sid %s "
 318                         "from string\n", response->data.domain_info.sid));
 319                 tevent_req_error(req, EINVAL);
 320                 return;
 321         }
 322         fstrcpy(state->domain->name, response->data.domain_info.name);
 323         fstrcpy(state->domain->alt_name, response->data.domain_info.alt_name);
 324         state->domain->native_mode = response->data.domain_info.native_mode;
 325         state->domain->active_directory =
 326                 response->data.domain_info.active_directory;
 327         state->domain->initialized = true;
 328
 329         TALLOC_FREE(response);
 330
 331         subreq = wb_child_request_send(state, state->ev, &state->domain->child,
 332                                        state->request);
 333         if (tevent_req_nomem(subreq, req)) {
 334                 return;
 335         }
 336         tevent_req_set_callback(subreq, wb_domain_request_done, req);
 337 }
 338
 339 static void wb_domain_request_done(struct tevent_req *subreq)
 340 {
 341         struct tevent_req *req = tevent_req_callback_data(
 342                 subreq, struct tevent_req);
 343         struct wb_domain_request_state *state = tevent_req_data(
 344                 req, struct wb_domain_request_state);
 345         int ret, err;
 346
 347         ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
 348                                     &err);
 349         TALLOC_FREE(subreq);
 350         if (ret == -1) {
 351                 tevent_req_error(req, err);
 352                 return;
 353         }
 354         tevent_req_done(req);
 355 }
 356
 357 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 358                            struct winbindd_response **presponse, int *err)
 359 {
 360         struct wb_domain_request_state *state = tevent_req_data(
 361                 req, struct wb_domain_request_state);
 362
 363         if (tevent_req_is_unix_error(req, err)) {
 364                 return -1;
 365         }
 366         *presponse = talloc_move(mem_ctx, &state->response);
 367         return 0;
 368 }
 369
 370 struct domain_request_state {
 371         struct winbindd_domain *domain;
 372         struct winbindd_request *request;
 373         struct winbindd_response *response;
 374         void (*continuation)(void *private_data_data, bool success);
 375         void *private_data_data;
 376 };
 377
 378 static void async_domain_request_done(struct tevent_req *req);
 379
 380 void async_domain_request(TALLOC_CTX *mem_ctx,
 381                           struct winbindd_domain *domain,
 382                           struct winbindd_request *request,
 383                           struct winbindd_response *response,
 384                           void (*continuation)(void *private_data_data, bool success),
 385                           void *private_data_data)
 386 {
 387         struct tevent_req *subreq;
 388         struct domain_request_state *state;
 389
 390         state = TALLOC_P(mem_ctx, struct domain_request_state);
 391         if (state == NULL) {
 392                 DEBUG(0, ("talloc failed\n"));
 393                 continuation(private_data_data, False);
 394                 return;
 395         }
 396
 397         state->domain = domain;
 398         state->request = request;
 399         state->response = response;
 400         state->continuation = continuation;
 401         state->private_data_data = private_data_data;
 402
 403         subreq = wb_domain_request_send(state, winbind_event_context(),
 404                                         domain, request);
 405         if (subreq == NULL) {
 406                 DEBUG(5, ("wb_domain_request_send failed\n"));
 407                 continuation(private_data_data, false);
 408                 return;
 409         }
 410         tevent_req_set_callback(subreq, async_domain_request_done, state);
 411 }
 412
 413 static void async_domain_request_done(struct tevent_req *req)
 414 {
 415         struct domain_request_state *state = tevent_req_callback_data(
 416                 req, struct domain_request_state);
 417         struct winbindd_response *response;
 418         int ret, err;
 419
 420         ret = wb_domain_request_recv(req, state, &response, &err);
 421         TALLOC_FREE(req);
 422         if (ret == -1) {
 423                 DEBUG(5, ("wb_domain_request returned %s\n", strerror(err)));
 424                 state->continuation(state->private_data_data, false);
 425                 return;
 426         }
 427         *(state->response) = *response;
 428         state->continuation(state->private_data_data, true);
 429 }
 430
 431 static void recvfrom_child(void *private_data_data, bool success)
 432 {
 433         struct winbindd_cli_state *state =
 434                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 435         enum winbindd_result result = state->response->result;
 436
 437         /* This is an optimization: The child has written directly to the
 438          * response buffer. The request itself is still in pending state,
 439          * state that in the result code. */
 440
 441         state->response->result = WINBINDD_PENDING;
 442
 443         if ((!success) || (result != WINBINDD_OK)) {
 444                 request_error(state);
 445                 return;
 446         }
 447
 448         request_ok(state);
 449 }
 450
 451 void sendto_domain(struct winbindd_cli_state *state,
 452                    struct winbindd_domain *domain)
 453 {
 454         async_domain_request(state->mem_ctx, domain,
 455                              state->request, state->response,
 456                              recvfrom_child, state);
 457 }
 458
 459 static void child_process_request(struct winbindd_child *child,
 460                                   struct winbindd_cli_state *state)
 461 {
 462         struct winbindd_domain *domain = child->domain;
 463         const struct winbindd_child_dispatch_table *table = child->table;
 464
 465         /* Free response data - we may be interrupted and receive another
 466            command before being able to send this data off. */
 467
 468         state->response->result = WINBINDD_ERROR;
 469         state->response->length = sizeof(struct winbindd_response);
 470
 471         /* as all requests in the child are sync, we can use talloc_tos() */
 472         state->mem_ctx = talloc_tos();
 473
 474         /* Process command */
 475
 476         for (; table->name; table++) {
 477                 if (state->request->cmd == table->struct_cmd) {
 478                         DEBUG(10,("child_process_request: request fn %s\n",
 479                                   table->name));
 480                         state->response->result = table->struct_fn(domain, state);
 481                         return;
 482                 }
 483         }
 484
 485         DEBUG(1 ,("child_process_request: unknown request fn number %d\n",
 486                   (int)state->request->cmd));
 487         state->response->result = WINBINDD_ERROR;
 488 }
 489
 490 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 491                  const struct winbindd_child_dispatch_table *table,
 492                  const char *logprefix,
 493                  const char *logname)
 494 {
 495         if (logprefix && logname) {
 496                 if (asprintf(&child->logfilename, "%s/%s-%s",
 497                              get_dyn_LOGFILEBASE(), logprefix, logname) < 0) {
 498                         smb_panic("Internal error: asprintf failed");
 499                 }
 500         } else {
 501                 smb_panic("Internal error: logprefix == NULL && "
 502                           "logname == NULL");
 503         }
 504
 505         child->domain = NULL;
 506         child->table = table;
 507         child->queue = tevent_queue_create(NULL, "winbind_child");
 508         SMB_ASSERT(child->queue != NULL);
 509         child->rpccli = wbint_rpccli_create(NULL, domain, child);
 510         SMB_ASSERT(child->rpccli != NULL);
 511 }
 512
 513 struct winbindd_child *children = NULL;
 514
 515 void winbind_child_died(pid_t pid)
 516 {
 517         struct winbindd_child *child;
 518
 519         for (child = children; child != NULL; child = child->next) {
 520                 if (child->pid == pid) {
 521                         break;
 522                 }
 523         }
 524
 525         if (child == NULL) {
 526                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 527                 return;
 528         }
 529
 530         /* This will be re-added in fork_domain_child() */
 531
 532         DLIST_REMOVE(children, child);
 533
 534         close(child->sock);
 535         child->sock = -1;
 536         child->pid = 0;
 537 }
 538
 539 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 540
 541 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 542 {
 543         flush_negative_conn_cache_for_domain(domain->name);
 544         if (*domain->alt_name) {
 545                 flush_negative_conn_cache_for_domain(domain->alt_name);
 546         }
 547 }
 548
 549 /*
 550  * Parent winbindd process sets its own debug level first and then
 551  * sends a message to all the winbindd children to adjust their debug
 552  * level to that of parents.
 553  */
 554
 555 void winbind_msg_debug(struct messaging_context *msg_ctx,
 556                          void *private_data,
 557                          uint32_t msg_type,
 558                          struct server_id server_id,
 559                          DATA_BLOB *data)
 560 {
 561         struct winbindd_child *child;
 562
 563         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 564
 565         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 566
 567         for (child = children; child != NULL; child = child->next) {
 568
 569                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 570                         (unsigned int)child->pid));
 571
 572                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 573                            MSG_DEBUG,
 574                            data->data,
 575                            strlen((char *) data->data) + 1);
 576         }
 577 }
 578
 579 /* Set our domains as offline and forward the offline message to our children. */
 580
 581 void winbind_msg_offline(struct messaging_context *msg_ctx,
 582                          void *private_data,
 583                          uint32_t msg_type,
 584                          struct server_id server_id,
 585                          DATA_BLOB *data)
 586 {
 587         struct winbindd_child *child;
 588         struct winbindd_domain *domain;
 589
 590         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 591
 592         if (!lp_winbind_offline_logon()) {
 593                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 594                 return;
 595         }
 596
 597         /* Set our global state as offline. */
 598         if (!set_global_winbindd_state_offline()) {
 599                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 600                 return;
 601         }
 602
 603         /* Set all our domains as offline. */
 604         for (domain = domain_list(); domain; domain = domain->next) {
 605                 if (domain->internal) {
 606                         continue;
 607                 }
 608                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 609                 set_domain_offline(domain);
 610         }
 611
 612         for (child = children; child != NULL; child = child->next) {
 613                 /* Don't send message to internal childs.  We've already
 614                    done so above. */
 615                 if (!child->domain || winbindd_internal_child(child)) {
 616                         continue;
 617                 }
 618
 619                 /* Or internal domains (this should not be possible....) */
 620                 if (child->domain->internal) {
 621                         continue;
 622                 }
 623
 624                 /* Each winbindd child should only process requests for one domain - make sure
 625                    we only set it online / offline for that domain. */
 626
 627                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 628                         (unsigned int)child->pid, domain->name ));
 629
 630                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 631                                    MSG_WINBIND_OFFLINE,
 632                                    (uint8 *)child->domain->name,
 633                                    strlen(child->domain->name)+1);
 634         }
 635 }
 636
 637 /* Set our domains as online and forward the online message to our children. */
 638
 639 void winbind_msg_online(struct messaging_context *msg_ctx,
 640                         void *private_data,
 641                         uint32_t msg_type,
 642                         struct server_id server_id,
 643                         DATA_BLOB *data)
 644 {
 645         struct winbindd_child *child;
 646         struct winbindd_domain *domain;
 647
 648         DEBUG(10,("winbind_msg_online: got online message.\n"));
 649
 650         if (!lp_winbind_offline_logon()) {
 651                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 652                 return;
 653         }
 654
 655         /* Set our global state as online. */
 656         set_global_winbindd_state_online();
 657
 658         smb_nscd_flush_user_cache();
 659         smb_nscd_flush_group_cache();
 660
 661         /* Set all our domains as online. */
 662         for (domain = domain_list(); domain; domain = domain->next) {
 663                 if (domain->internal) {
 664                         continue;
 665                 }
 666                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 667
 668                 winbindd_flush_negative_conn_cache(domain);
 669                 set_domain_online_request(domain);
 670
 671                 /* Send an online message to the idmap child when our
 672                    primary domain comes back online */
 673
 674                 if ( domain->primary ) {
 675                         struct winbindd_child *idmap = idmap_child();
 676
 677                         if ( idmap->pid != 0 ) {
 678                                 messaging_send_buf(msg_ctx,
 679                                                    pid_to_procid(idmap->pid),
 680                                                    MSG_WINBIND_ONLINE,
 681                                                    (uint8 *)domain->name,
 682                                                    strlen(domain->name)+1);
 683                         }
 684                 }
 685         }
 686
 687         for (child = children; child != NULL; child = child->next) {
 688                 /* Don't send message to internal childs. */
 689                 if (!child->domain || winbindd_internal_child(child)) {
 690                         continue;
 691                 }
 692
 693                 /* Or internal domains (this should not be possible....) */
 694                 if (child->domain->internal) {
 695                         continue;
 696                 }
 697
 698                 /* Each winbindd child should only process requests for one domain - make sure
 699                    we only set it online / offline for that domain. */
 700
 701                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 702                         (unsigned int)child->pid, child->domain->name ));
 703
 704                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 705                                    MSG_WINBIND_ONLINE,
 706                                    (uint8 *)child->domain->name,
 707                                    strlen(child->domain->name)+1);
 708         }
 709 }
 710
 711 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 712 {
 713         struct winbindd_domain *domain;
 714         char *buf = NULL;
 715
 716         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 717                                    get_global_winbindd_state_offline() ?
 718                                    "Offline":"Online")) == NULL) {
 719                 return NULL;
 720         }
 721
 722         for (domain = domain_list(); domain; domain = domain->next) {
 723                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 724                                                   domain->name,
 725                                                   domain->online ?
 726                                                   "Online":"Offline")) == NULL) {
 727                         return NULL;
 728                 }
 729         }
 730
 731         buf = talloc_asprintf_append_buffer(buf, "\n");
 732
 733         DEBUG(5,("collect_onlinestatus: %s", buf));
 734
 735         return buf;
 736 }
 737
 738 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 739                               void *private_data,
 740                               uint32_t msg_type,
 741                               struct server_id server_id,
 742                               DATA_BLOB *data)
 743 {
 744         TALLOC_CTX *mem_ctx;
 745         const char *message;
 746         struct server_id *sender;
 747
 748         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 749
 750         if (!data->data) {
 751                 return;
 752         }
 753
 754         sender = (struct server_id *)data->data;
 755
 756         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 757         if (mem_ctx == NULL) {
 758                 return;
 759         }
 760
 761         message = collect_onlinestatus(mem_ctx);
 762         if (message == NULL) {
 763                 talloc_destroy(mem_ctx);
 764                 return;
 765         }
 766
 767         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 768                            (uint8 *)message, strlen(message) + 1);
 769
 770         talloc_destroy(mem_ctx);
 771 }
 772
 773 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 774                                  void *private_data,
 775                                  uint32_t msg_type,
 776                                  struct server_id server_id,
 777                                  DATA_BLOB *data)
 778 {
 779         struct winbindd_child *child;
 780
 781         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 782
 783         dump_event_list(winbind_event_context());
 784
 785         for (child = children; child != NULL; child = child->next) {
 786
 787                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 788                         (unsigned int)child->pid));
 789
 790                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 791                                    MSG_DUMP_EVENT_LIST,
 792                                    NULL, 0);
 793         }
 794
 795 }
 796
 797 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 798                                   void *private_data,
 799                                   uint32_t msg_type,
 800                                   struct server_id server_id,
 801                                   DATA_BLOB *data)
 802 {
 803         TALLOC_CTX *mem_ctx;
 804         const char *message = NULL;
 805         struct server_id *sender = NULL;
 806         const char *domain = NULL;
 807         char *s = NULL;
 808         NTSTATUS status;
 809         struct winbindd_domain *dom = NULL;
 810
 811         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 812
 813         if (!data || !data->data) {
 814                 return;
 815         }
 816
 817         if (data->length < sizeof(struct server_id)) {
 818                 return;
 819         }
 820
 821         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 822         if (!mem_ctx) {
 823                 return;
 824         }
 825
 826         sender = (struct server_id *)data->data;
 827         if (data->length > sizeof(struct server_id)) {
 828                 domain = (const char *)data->data+sizeof(struct server_id);
 829         }
 830
 831         if (domain) {
 832
 833                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 834                         domain));
 835
 836                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 837                                                   find_domain_from_name_noinit(domain));
 838                 if (!message) {
 839                         talloc_destroy(mem_ctx);
 840                         return;
 841                 }
 842
 843                 messaging_send_buf(msg_ctx, *sender,
 844                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 845                                    (uint8_t *)message, strlen(message) + 1);
 846
 847                 talloc_destroy(mem_ctx);
 848
 849                 return;
 850         }
 851
 852         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 853
 854         for (dom = domain_list(); dom; dom=dom->next) {
 855                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 856                 if (!message) {
 857                         talloc_destroy(mem_ctx);
 858                         return;
 859                 }
 860
 861                 s = talloc_asprintf_append(s, "%s\n", message);
 862                 if (!s) {
 863                         talloc_destroy(mem_ctx);
 864                         return;
 865                 }
 866         }
 867
 868         status = messaging_send_buf(msg_ctx, *sender,
 869                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 870                                     (uint8_t *)s, strlen(s) + 1);
 871         if (!NT_STATUS_IS_OK(status)) {
 872                 DEBUG(0,("failed to send message: %s\n",
 873                 nt_errstr(status)));
 874         }
 875
 876         talloc_destroy(mem_ctx);
 877 }
 878
 879 static void account_lockout_policy_handler(struct event_context *ctx,
 880                                            struct timed_event *te,
 881                                            struct timeval now,
 882                                            void *private_data)
 883 {
 884         struct winbindd_child *child =
 885                 (struct winbindd_child *)private_data;
 886         TALLOC_CTX *mem_ctx = NULL;
 887         struct winbindd_methods *methods;
 888         struct samr_DomInfo12 lockout_policy;
 889         NTSTATUS result;
 890
 891         DEBUG(10,("account_lockout_policy_handler called\n"));
 892
 893         TALLOC_FREE(child->lockout_policy_event);
 894
 895         if ( !winbindd_can_contact_domain( child->domain ) ) {
 896                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 897                           "do not have an incoming trust to domain %s\n",
 898                           child->domain->name));
 899
 900                 return;
 901         }
 902
 903         methods = child->domain->methods;
 904
 905         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 906         if (!mem_ctx) {
 907                 result = NT_STATUS_NO_MEMORY;
 908         } else {
 909                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 910         }
 911         TALLOC_FREE(mem_ctx);
 912
 913         if (!NT_STATUS_IS_OK(result)) {
 914                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 915                          nt_errstr(result)));
 916         }
 917
 918         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 919                                                       timeval_current_ofs(3600, 0),
 920                                                       account_lockout_policy_handler,
 921                                                       child);
 922 }
 923
 924 static time_t get_machine_password_timeout(void)
 925 {
 926         /* until we have gpo support use lp setting */
 927         return lp_machine_password_timeout();
 928 }
 929
 930 static bool calculate_next_machine_pwd_change(const char *domain,
 931                                               struct timeval *t)
 932 {
 933         time_t pass_last_set_time;
 934         time_t timeout;
 935         time_t next_change;
 936         struct timeval tv;
 937         char *pw;
 938
 939         pw = secrets_fetch_machine_password(domain,
 940                                             &pass_last_set_time,
 941                                             NULL);
 942
 943         if (pw == NULL) {
 944                 DEBUG(0,("cannot fetch own machine password ????"));
 945                 return false;
 946         }
 947
 948         SAFE_FREE(pw);
 949
 950         timeout = get_machine_password_timeout();
 951         if (timeout == 0) {
 952                 DEBUG(10,("machine password never expires\n"));
 953                 return false;
 954         }
 955
 956         tv.tv_sec = pass_last_set_time;
 957         DEBUG(10, ("password last changed %s\n",
 958                    timeval_string(talloc_tos(), &tv, false)));
 959         tv.tv_sec += timeout;
 960         DEBUGADD(10, ("password valid until %s\n",
 961                       timeval_string(talloc_tos(), &tv, false)));
 962
 963         if (time(NULL) < (pass_last_set_time + timeout)) {
 964                 next_change = pass_last_set_time + timeout;
 965                 DEBUG(10,("machine password still valid until: %s\n",
 966                         http_timestring(talloc_tos(), next_change)));
 967                 *t = timeval_set(next_change, 0);
 968
 969                 if (lp_clustering()) {
 970                         uint8_t randbuf;
 971                         /*
 972                          * When having a cluster, we have several
 973                          * winbinds racing for the password change. In
 974                          * the machine_password_change_handler()
 975                          * function we check if someone else was
 976                          * faster when the event triggers. We add a
 977                          * 255-second random delay here, so that we
 978                          * don't run to change the password at the
 979                          * exact same moment.
 980                          */
 981                         generate_random_buffer(&randbuf, sizeof(randbuf));
 982                         DEBUG(10, ("adding %d seconds randomness\n",
 983                                    (int)randbuf));
 984                         t->tv_sec += randbuf;
 985                 }
 986                 return true;
 987         }
 988
 989         DEBUG(10,("machine password expired, needs immediate change\n"));
 990
 991         *t = timeval_zero();
 992
 993         return true;
 994 }
 995
 996 static void machine_password_change_handler(struct event_context *ctx,
 997                                             struct timed_event *te,
 998                                             struct timeval now,
 999                                             void *private_data)
1000 {
1001         struct winbindd_child *child =
1002                 (struct winbindd_child *)private_data;
1003         struct rpc_pipe_client *netlogon_pipe = NULL;
1004         TALLOC_CTX *frame;
1005         NTSTATUS result;
1006         struct timeval next_change;
1007
1008         DEBUG(10,("machine_password_change_handler called\n"));
1009
1010         TALLOC_FREE(child->machine_password_change_event);
1011
1012         if (!calculate_next_machine_pwd_change(child->domain->name,
1013                                                &next_change)) {
1014                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1015                 return;
1016         }
1017
1018         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1019                    timeval_string(talloc_tos(), &next_change, false)));
1020
1021         if (!timeval_expired(&next_change)) {
1022                 DEBUG(10, ("Someone else has already changed the pw\n"));
1023                 goto done;
1024         }
1025
1026         if (!winbindd_can_contact_domain(child->domain)) {
1027                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
1028                           "do not have an incoming trust to domain %s\n",
1029                           child->domain->name));
1030                 return;
1031         }
1032
1033         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
1034         if (!NT_STATUS_IS_OK(result)) {
1035                 DEBUG(10,("machine_password_change_handler: "
1036                         "failed to connect netlogon pipe: %s\n",
1037                          nt_errstr(result)));
1038                 return;
1039         }
1040
1041         frame = talloc_stackframe();
1042
1043         result = trust_pw_find_change_and_store_it(netlogon_pipe,
1044                                                    frame,
1045                                                    child->domain->name);
1046         TALLOC_FREE(frame);
1047
1048         DEBUG(10, ("machine_password_change_handler: "
1049                    "trust_pw_find_change_and_store_it returned %s\n",
1050                    nt_errstr(result)));
1051
1052         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
1053                 DEBUG(3,("machine_password_change_handler: password set returned "
1054                          "ACCESS_DENIED.  Maybe the trust account "
1055                          "password was changed and we didn't know it. "
1056                          "Killing connections to domain %s\n",
1057                          child->domain->name));
1058                 TALLOC_FREE(child->domain->conn.netlogon_pipe);
1059         }
1060
1061         if (!calculate_next_machine_pwd_change(child->domain->name,
1062                                                &next_change)) {
1063                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1064                 return;
1065         }
1066
1067         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1068                    timeval_string(talloc_tos(), &next_change, false)));
1069
1070         if (!NT_STATUS_IS_OK(result)) {
1071                 struct timeval tmp;
1072                 /*
1073                  * In case of failure, give the DC a minute to recover
1074                  */
1075                 tmp = timeval_current_ofs(60, 0);
1076                 next_change = timeval_max(&next_change, &tmp);
1077         }
1078
1079 done:
1080         child->machine_password_change_event = event_add_timed(winbind_event_context(), NULL,
1081                                                               next_change,
1082                                                               machine_password_change_handler,
1083                                                               child);
1084 }
1085
1086 /* Deal with a request to go offline. */
1087
1088 static void child_msg_offline(struct messaging_context *msg,
1089                               void *private_data,
1090                               uint32_t msg_type,
1091                               struct server_id server_id,
1092                               DATA_BLOB *data)
1093 {
1094         struct winbindd_domain *domain;
1095         struct winbindd_domain *primary_domain = NULL;
1096         const char *domainname = (const char *)data->data;
1097
1098         if (data->data == NULL || data->length == 0) {
1099                 return;
1100         }
1101
1102         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1103
1104         if (!lp_winbind_offline_logon()) {
1105                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1106                 return;
1107         }
1108
1109         primary_domain = find_our_domain();
1110
1111         /* Mark the requested domain offline. */
1112
1113         for (domain = domain_list(); domain; domain = domain->next) {
1114                 if (domain->internal) {
1115                         continue;
1116                 }
1117                 if (strequal(domain->name, domainname)) {
1118                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1119                         set_domain_offline(domain);
1120                         /* we are in the trusted domain, set the primary domain
1121                          * offline too */
1122                         if (domain != primary_domain) {
1123                                 set_domain_offline(primary_domain);
1124                         }
1125                 }
1126         }
1127 }
1128
1129 /* Deal with a request to go online. */
1130
1131 static void child_msg_online(struct messaging_context *msg,
1132                              void *private_data,
1133                              uint32_t msg_type,
1134                              struct server_id server_id,
1135                              DATA_BLOB *data)
1136 {
1137         struct winbindd_domain *domain;
1138         struct winbindd_domain *primary_domain = NULL;
1139         const char *domainname = (const char *)data->data;
1140
1141         if (data->data == NULL || data->length == 0) {
1142                 return;
1143         }
1144
1145         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1146
1147         if (!lp_winbind_offline_logon()) {
1148                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1149                 return;
1150         }
1151
1152         primary_domain = find_our_domain();
1153
1154         /* Set our global state as online. */
1155         set_global_winbindd_state_online();
1156
1157         /* Try and mark everything online - delete any negative cache entries
1158            to force a reconnect now. */
1159
1160         for (domain = domain_list(); domain; domain = domain->next) {
1161                 if (domain->internal) {
1162                         continue;
1163                 }
1164                 if (strequal(domain->name, domainname)) {
1165                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1166                         winbindd_flush_negative_conn_cache(domain);
1167                         set_domain_online_request(domain);
1168
1169                         /* we can be in trusted domain, which will contact primary domain
1170                          * we have to bring primary domain online in trusted domain process
1171                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1172                          * --> contact_domain = find_our_domain()
1173                          * */
1174                         if (domain != primary_domain) {
1175                                 winbindd_flush_negative_conn_cache(primary_domain);
1176                                 set_domain_online_request(primary_domain);
1177                         }
1178                 }
1179         }
1180 }
1181
1182 static void child_msg_dump_event_list(struct messaging_context *msg,
1183                                       void *private_data,
1184                                       uint32_t msg_type,
1185                                       struct server_id server_id,
1186                                       DATA_BLOB *data)
1187 {
1188         DEBUG(5,("child_msg_dump_event_list received\n"));
1189
1190         dump_event_list(winbind_event_context());
1191 }
1192
1193 bool winbindd_reinit_after_fork(const char *logfilename)
1194 {
1195         struct winbindd_domain *domain;
1196         struct winbindd_child *cl;
1197
1198         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1199                                                winbind_event_context(),
1200                                                true))) {
1201                 DEBUG(0,("reinit_after_fork() failed\n"));
1202                 return false;
1203         }
1204
1205         close_conns_after_fork();
1206
1207         if (!override_logfile && logfilename) {
1208                 lp_set_logfile(logfilename);
1209                 reopen_logs();
1210         }
1211
1212         if (!winbindd_setup_sig_term_handler(false))
1213                 return false;
1214         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1215                                             logfilename))
1216                 return false;
1217
1218         /* Don't handle the same messages as our parent. */
1219         messaging_deregister(winbind_messaging_context(),
1220                              MSG_SMB_CONF_UPDATED, NULL);
1221         messaging_deregister(winbind_messaging_context(),
1222                              MSG_SHUTDOWN, NULL);
1223         messaging_deregister(winbind_messaging_context(),
1224                              MSG_WINBIND_OFFLINE, NULL);
1225         messaging_deregister(winbind_messaging_context(),
1226                              MSG_WINBIND_ONLINE, NULL);
1227         messaging_deregister(winbind_messaging_context(),
1228                              MSG_WINBIND_ONLINESTATUS, NULL);
1229         messaging_deregister(winbind_messaging_context(),
1230                              MSG_DUMP_EVENT_LIST, NULL);
1231         messaging_deregister(winbind_messaging_context(),
1232                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1233         messaging_deregister(winbind_messaging_context(),
1234                              MSG_DEBUG, NULL);
1235
1236         /* We have destroyed all events in the winbindd_event_context
1237          * in reinit_after_fork(), so clean out all possible pending
1238          * event pointers. */
1239
1240         /* Deal with check_online_events. */
1241
1242         for (domain = domain_list(); domain; domain = domain->next) {
1243                 TALLOC_FREE(domain->check_online_event);
1244         }
1245
1246         /* Ensure we're not handling a credential cache event inherited
1247          * from our parent. */
1248
1249         ccache_remove_all_after_fork();
1250
1251         /* Destroy all possible events in child list. */
1252         for (cl = children; cl != NULL; cl = cl->next) {
1253                 TALLOC_FREE(cl->lockout_policy_event);
1254                 TALLOC_FREE(cl->machine_password_change_event);
1255
1256                 /* Children should never be able to send
1257                  * each other messages, all messages must
1258                  * go through the parent.
1259                  */
1260                 cl->pid = (pid_t)0;
1261         }
1262         /*
1263          * This is a little tricky, children must not
1264          * send an MSG_WINBIND_ONLINE message to idmap_child().
1265          * If we are in a child of our primary domain or
1266          * in the process created by fork_child_dc_connect(),
1267          * and the primary domain cannot go online,
1268          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1269          * periodically to idmap_child().
1270          *
1271          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1272          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1273          * ---> init_dc_connection() ---> cm_open_connection --->
1274          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1275          * idmap_child(). Disallow children sending messages
1276          * to each other, all messages must go through the parent.
1277          */
1278         cl = idmap_child();
1279         cl->pid = (pid_t)0;
1280
1281         return true;
1282 }
1283
1284 /*
1285  * In a child there will be only one domain, reference that here.
1286  */
1287 static struct winbindd_domain *child_domain;
1288
1289 struct winbindd_domain *wb_child_domain(void)
1290 {
1291         return child_domain;
1292 }
1293
1294 static bool fork_domain_child(struct winbindd_child *child)
1295 {
1296         int fdpair[2];
1297         struct winbindd_cli_state state;
1298         struct winbindd_request request;
1299         struct winbindd_response response;
1300         struct winbindd_domain *primary_domain = NULL;
1301
1302         if (child->domain) {
1303                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1304                            child->domain->name));
1305         } else {
1306                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1307         }
1308         child_domain = child->domain;
1309
1310         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1311                 DEBUG(0, ("Could not open child pipe: %s\n",
1312                           strerror(errno)));
1313                 return False;
1314         }
1315
1316         ZERO_STRUCT(state);
1317         state.pid = sys_getpid();
1318         state.request = &request;
1319         state.response = &response;
1320
1321         child->pid = sys_fork();
1322
1323         if (child->pid == -1) {
1324                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1325                 return False;
1326         }
1327
1328         if (child->pid != 0) {
1329                 /* Parent */
1330                 close(fdpair[0]);
1331                 child->next = child->prev = NULL;
1332                 DLIST_ADD(children, child);
1333                 child->sock = fdpair[1];
1334                 return True;
1335         }
1336
1337         /* Child */
1338
1339         DEBUG(10, ("Child process %d\n", (int)sys_getpid()));
1340
1341         /* Stop zombies in children */
1342         CatchChild();
1343
1344         state.sock = fdpair[0];
1345         close(fdpair[1]);
1346
1347         if (!winbindd_reinit_after_fork(child->logfilename)) {
1348                 _exit(0);
1349         }
1350
1351         /* Handle online/offline messages. */
1352         messaging_register(winbind_messaging_context(), NULL,
1353                            MSG_WINBIND_OFFLINE, child_msg_offline);
1354         messaging_register(winbind_messaging_context(), NULL,
1355                            MSG_WINBIND_ONLINE, child_msg_online);
1356         messaging_register(winbind_messaging_context(), NULL,
1357                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1358         messaging_register(winbind_messaging_context(), NULL,
1359                            MSG_DEBUG, debug_message);
1360
1361         primary_domain = find_our_domain();
1362
1363         if (primary_domain == NULL) {
1364                 smb_panic("no primary domain found");
1365         }
1366
1367         /* It doesn't matter if we allow cache login,
1368          * try to bring domain online after fork. */
1369         if ( child->domain ) {
1370                 child->domain->startup = True;
1371                 child->domain->startup_time = time(NULL);
1372                 /* we can be in primary domain or in trusted domain
1373                  * If we are in trusted domain, set the primary domain
1374                  * in start-up mode */
1375                 if (!(child->domain->internal)) {
1376                         set_domain_online_request(child->domain);
1377                         if (!(child->domain->primary)) {
1378                                 primary_domain->startup = True;
1379                                 primary_domain->startup_time = time(NULL);
1380                                 set_domain_online_request(primary_domain);
1381                         }
1382                 }
1383         }
1384
1385         /*
1386          * We are in idmap child, make sure that we set the
1387          * check_online_event to bring primary domain online.
1388          */
1389         if (child == idmap_child()) {
1390                 set_domain_online_request(primary_domain);
1391         }
1392
1393         /* We might be in the idmap child...*/
1394         if (child->domain && !(child->domain->internal) &&
1395             lp_winbind_offline_logon()) {
1396
1397                 set_domain_online_request(child->domain);
1398
1399                 if (primary_domain && (primary_domain != child->domain)) {
1400                         /* We need to talk to the primary
1401                          * domain as well as the trusted
1402                          * domain inside a trusted domain
1403                          * child.
1404                          * See the code in :
1405                          * set_dc_type_and_flags_trustinfo()
1406                          * for details.
1407                          */
1408                         set_domain_online_request(primary_domain);
1409                 }
1410
1411                 child->lockout_policy_event = event_add_timed(
1412                         winbind_event_context(), NULL, timeval_zero(),
1413                         account_lockout_policy_handler,
1414                         child);
1415         }
1416
1417         if (child->domain && child->domain->primary &&
1418             !USE_KERBEROS_KEYTAB &&
1419             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1420
1421                 struct timeval next_change;
1422
1423                 if (calculate_next_machine_pwd_change(child->domain->name,
1424                                                        &next_change)) {
1425                         child->machine_password_change_event = event_add_timed(
1426                                 winbind_event_context(), NULL, next_change,
1427                                 machine_password_change_handler,
1428                                 child);
1429                 }
1430         }
1431
1432         while (1) {
1433
1434                 int ret;
1435                 fd_set r_fds;
1436                 fd_set w_fds;
1437                 int maxfd;
1438                 struct timeval t;
1439                 struct timeval *tp;
1440                 struct timeval now;
1441                 TALLOC_CTX *frame = talloc_stackframe();
1442                 struct iovec iov[2];
1443                 int iov_count;
1444                 NTSTATUS status;
1445
1446                 if (run_events(winbind_event_context(), 0, NULL, NULL)) {
1447                         TALLOC_FREE(frame);
1448                         continue;
1449                 }
1450
1451                 GetTimeOfDay(&now);
1452
1453                 if (child->domain && child->domain->startup &&
1454                                 (now.tv_sec > child->domain->startup_time + 30)) {
1455                         /* No longer in "startup" mode. */
1456                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1457                                 child->domain->name ));
1458                         child->domain->startup = False;
1459                 }
1460
1461                 FD_ZERO(&r_fds);
1462                 FD_ZERO(&w_fds);
1463                 FD_SET(state.sock, &r_fds);
1464                 maxfd = state.sock;
1465
1466                 event_add_to_select_args(winbind_event_context(), &now,
1467                                          &r_fds, &w_fds, &t, &maxfd);
1468                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1469                 if (tp) {
1470                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1471                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1472                 }
1473
1474                 ret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, tp);
1475
1476                 if (run_events(winbind_event_context(), ret, &r_fds, &w_fds)) {
1477                         /* We got a signal - continue. */
1478                         TALLOC_FREE(frame);
1479                         continue;
1480                 }
1481
1482                 if (ret == 0) {
1483                         DEBUG(11,("nothing is ready yet, continue\n"));
1484                         TALLOC_FREE(frame);
1485                         continue;
1486                 }
1487
1488                 if (ret == -1 && errno == EINTR) {
1489                         /* We got a signal - continue. */
1490                         TALLOC_FREE(frame);
1491                         continue;
1492                 }
1493
1494                 if (ret == -1 && errno != EINTR) {
1495                         DEBUG(0,("select error occured\n"));
1496                         TALLOC_FREE(frame);
1497                         perror("select");
1498                         _exit(1);
1499                 }
1500
1501                 /* fetch a request from the main daemon */
1502                 status = child_read_request(&state);
1503
1504                 if (!NT_STATUS_IS_OK(status)) {
1505                         /* we lost contact with our parent */
1506                         _exit(0);
1507                 }
1508
1509                 DEBUG(4,("child daemon request %d\n", (int)state.request->cmd));
1510
1511                 ZERO_STRUCTP(state.response);
1512                 state.request->null_term = '\0';
1513                 state.mem_ctx = frame;
1514                 child_process_request(child, &state);
1515
1516                 DEBUG(4, ("Finished processing child request %d\n",
1517                           (int)state.request->cmd));
1518
1519                 SAFE_FREE(state.request->extra_data.data);
1520
1521                 iov[0].iov_base = (void *)state.response;
1522                 iov[0].iov_len = sizeof(struct winbindd_response);
1523                 iov_count = 1;
1524
1525                 if (state.response->length > sizeof(struct winbindd_response)) {
1526                         iov[1].iov_base =
1527                                 (void *)state.response->extra_data.data;
1528                         iov[1].iov_len = state.response->length-iov[0].iov_len;
1529                         iov_count = 2;
1530                 }
1531
1532                 DEBUG(10, ("Writing %d bytes to parent\n",
1533                            (int)state.response->length));
1534
1535                 if (write_data_iov(state.sock, iov, iov_count) !=
1536                     state.response->length) {
1537                         DEBUG(0, ("Could not write result\n"));
1538                         exit(1);
1539                 }
1540                 TALLOC_FREE(frame);
1541         }
1542 }