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 /*
 371  * Machinery for async requests sent to children. You set up a
 372  * winbindd_request, select a child to query, and issue a async_request
 373  * call. When the request is completed, the callback function you specified is
 374  * called back with the private pointer you gave to async_request.
 375  */
 376
 377 struct winbindd_async_request {
 378         struct winbindd_async_request *next, *prev;
 379         TALLOC_CTX *mem_ctx;
 380         struct winbindd_child *child;
 381         struct winbindd_response *response;
 382         void (*continuation)(void *private_data, bool success);
 383         struct timed_event *reply_timeout_event;
 384         pid_t child_pid; /* pid of the child we're waiting on. Used to detect
 385                             a restart of the child (child->pid != child_pid). */
 386         void *private_data;
 387 };
 388
 389 static void async_request_done(struct tevent_req *req);
 390
 391 void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
 392                    struct winbindd_request *request,
 393                    struct winbindd_response *response,
 394                    void (*continuation)(void *private_data, bool success),
 395                    void *private_data)
 396 {
 397         struct winbindd_async_request *state;
 398         struct tevent_req *req;
 399
 400         DEBUG(10, ("Sending request to child pid %d (domain=%s)\n",
 401                    (int)child->pid,
 402                    (child->domain != NULL) ? child->domain->name : "''"));
 403
 404         state = talloc(mem_ctx, struct winbindd_async_request);
 405         if (state == NULL) {
 406                 DEBUG(0, ("talloc failed\n"));
 407                 continuation(private_data, False);
 408                 return;
 409         }
 410
 411         state->mem_ctx = mem_ctx;
 412         state->child = child;
 413         state->reply_timeout_event = NULL;
 414         state->response = response;
 415         state->continuation = continuation;
 416         state->private_data = private_data;
 417
 418         request->pid = child->pid;
 419
 420         req = wb_child_request_send(state, winbind_event_context(),
 421                                            child, request);
 422         if (req == NULL) {
 423                 DEBUG(0, ("wb_child_request_send failed\n"));
 424                 continuation(private_data, false);
 425                 return;
 426         }
 427         tevent_req_set_callback(req, async_request_done, state);
 428 }
 429
 430 static void async_request_done(struct tevent_req *req)
 431 {
 432         struct winbindd_async_request *state = tevent_req_callback_data(
 433                 req, struct winbindd_async_request);
 434         struct winbindd_response *response;
 435         int ret, err;
 436
 437         ret = wb_child_request_recv(req, state, &response, &err);
 438         TALLOC_FREE(req);
 439         if (ret == -1) {
 440                 DEBUG(2, ("wb_child_request_recv failed: %s\n",
 441                           strerror(err)));
 442                 state->continuation(state->private_data, false);
 443                 return;
 444         }
 445         *state->response = *response;
 446         state->continuation(state->private_data, true);
 447 }
 448
 449 struct domain_request_state {
 450         struct winbindd_domain *domain;
 451         struct winbindd_request *request;
 452         struct winbindd_response *response;
 453         void (*continuation)(void *private_data_data, bool success);
 454         void *private_data_data;
 455 };
 456
 457 static void async_domain_request_done(struct tevent_req *req);
 458
 459 void async_domain_request(TALLOC_CTX *mem_ctx,
 460                           struct winbindd_domain *domain,
 461                           struct winbindd_request *request,
 462                           struct winbindd_response *response,
 463                           void (*continuation)(void *private_data_data, bool success),
 464                           void *private_data_data)
 465 {
 466         struct tevent_req *subreq;
 467         struct domain_request_state *state;
 468
 469         state = TALLOC_P(mem_ctx, struct domain_request_state);
 470         if (state == NULL) {
 471                 DEBUG(0, ("talloc failed\n"));
 472                 continuation(private_data_data, False);
 473                 return;
 474         }
 475
 476         state->domain = domain;
 477         state->request = request;
 478         state->response = response;
 479         state->continuation = continuation;
 480         state->private_data_data = private_data_data;
 481
 482         subreq = wb_domain_request_send(state, winbind_event_context(),
 483                                         domain, request);
 484         if (subreq == NULL) {
 485                 DEBUG(5, ("wb_domain_request_send failed\n"));
 486                 continuation(private_data_data, false);
 487                 return;
 488         }
 489         tevent_req_set_callback(subreq, async_domain_request_done, state);
 490 }
 491
 492 static void async_domain_request_done(struct tevent_req *req)
 493 {
 494         struct domain_request_state *state = tevent_req_callback_data(
 495                 req, struct domain_request_state);
 496         struct winbindd_response *response;
 497         int ret, err;
 498
 499         ret = wb_domain_request_recv(req, state, &response, &err);
 500         TALLOC_FREE(req);
 501         if (ret == -1) {
 502                 DEBUG(5, ("wb_domain_request returned %s\n", strerror(err)));
 503                 state->continuation(state->private_data_data, false);
 504                 return;
 505         }
 506         *(state->response) = *response;
 507         state->continuation(state->private_data_data, true);
 508 }
 509
 510 static void recvfrom_child(void *private_data_data, bool success)
 511 {
 512         struct winbindd_cli_state *state =
 513                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 514         enum winbindd_result result = state->response->result;
 515
 516         /* This is an optimization: The child has written directly to the
 517          * response buffer. The request itself is still in pending state,
 518          * state that in the result code. */
 519
 520         state->response->result = WINBINDD_PENDING;
 521
 522         if ((!success) || (result != WINBINDD_OK)) {
 523                 request_error(state);
 524                 return;
 525         }
 526
 527         request_ok(state);
 528 }
 529
 530 void sendto_child(struct winbindd_cli_state *state,
 531                   struct winbindd_child *child)
 532 {
 533         async_request(state->mem_ctx, child, state->request,
 534                       state->response, recvfrom_child, state);
 535 }
 536
 537 void sendto_domain(struct winbindd_cli_state *state,
 538                    struct winbindd_domain *domain)
 539 {
 540         async_domain_request(state->mem_ctx, domain,
 541                              state->request, state->response,
 542                              recvfrom_child, state);
 543 }
 544
 545 static void child_process_request(struct winbindd_child *child,
 546                                   struct winbindd_cli_state *state)
 547 {
 548         struct winbindd_domain *domain = child->domain;
 549         const struct winbindd_child_dispatch_table *table = child->table;
 550
 551         /* Free response data - we may be interrupted and receive another
 552            command before being able to send this data off. */
 553
 554         state->response->result = WINBINDD_ERROR;
 555         state->response->length = sizeof(struct winbindd_response);
 556
 557         /* as all requests in the child are sync, we can use talloc_tos() */
 558         state->mem_ctx = talloc_tos();
 559
 560         /* Process command */
 561
 562         for (; table->name; table++) {
 563                 if (state->request->cmd == table->struct_cmd) {
 564                         DEBUG(10,("child_process_request: request fn %s\n",
 565                                   table->name));
 566                         state->response->result = table->struct_fn(domain, state);
 567                         return;
 568                 }
 569         }
 570
 571         DEBUG(1 ,("child_process_request: unknown request fn number %d\n",
 572                   (int)state->request->cmd));
 573         state->response->result = WINBINDD_ERROR;
 574 }
 575
 576 void setup_child(struct winbindd_child *child,
 577                  const struct winbindd_child_dispatch_table *table,
 578                  const char *logprefix,
 579                  const char *logname)
 580 {
 581         if (logprefix && logname) {
 582                 if (asprintf(&child->logfilename, "%s/%s-%s",
 583                              get_dyn_LOGFILEBASE(), logprefix, logname) < 0) {
 584                         smb_panic("Internal error: asprintf failed");
 585                 }
 586         } else {
 587                 smb_panic("Internal error: logprefix == NULL && "
 588                           "logname == NULL");
 589         }
 590
 591         child->domain = NULL;
 592         child->table = table;
 593         child->queue = tevent_queue_create(NULL, "winbind_child");
 594         SMB_ASSERT(child->queue != NULL);
 595 }
 596
 597 struct winbindd_child *children = NULL;
 598
 599 void winbind_child_died(pid_t pid)
 600 {
 601         struct winbindd_child *child;
 602
 603         for (child = children; child != NULL; child = child->next) {
 604                 if (child->pid == pid) {
 605                         break;
 606                 }
 607         }
 608
 609         if (child == NULL) {
 610                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 611                 return;
 612         }
 613
 614         /* This will be re-added in fork_domain_child() */
 615
 616         DLIST_REMOVE(children, child);
 617
 618         close(child->sock);
 619         child->sock = -1;
 620         child->pid = 0;
 621 }
 622
 623 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 624
 625 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 626 {
 627         flush_negative_conn_cache_for_domain(domain->name);
 628         if (*domain->alt_name) {
 629                 flush_negative_conn_cache_for_domain(domain->alt_name);
 630         }
 631 }
 632
 633 /*
 634  * Parent winbindd process sets its own debug level first and then
 635  * sends a message to all the winbindd children to adjust their debug
 636  * level to that of parents.
 637  */
 638
 639 void winbind_msg_debug(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
 647         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 648
 649         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 650
 651         for (child = children; child != NULL; child = child->next) {
 652
 653                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 654                         (unsigned int)child->pid));
 655
 656                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 657                            MSG_DEBUG,
 658                            data->data,
 659                            strlen((char *) data->data) + 1);
 660         }
 661 }
 662
 663 /* Set our domains as offline and forward the offline message to our children. */
 664
 665 void winbind_msg_offline(struct messaging_context *msg_ctx,
 666                          void *private_data,
 667                          uint32_t msg_type,
 668                          struct server_id server_id,
 669                          DATA_BLOB *data)
 670 {
 671         struct winbindd_child *child;
 672         struct winbindd_domain *domain;
 673
 674         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 675
 676         if (!lp_winbind_offline_logon()) {
 677                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 678                 return;
 679         }
 680
 681         /* Set our global state as offline. */
 682         if (!set_global_winbindd_state_offline()) {
 683                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 684                 return;
 685         }
 686
 687         /* Set all our domains as offline. */
 688         for (domain = domain_list(); domain; domain = domain->next) {
 689                 if (domain->internal) {
 690                         continue;
 691                 }
 692                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 693                 set_domain_offline(domain);
 694         }
 695
 696         for (child = children; child != NULL; child = child->next) {
 697                 /* Don't send message to internal childs.  We've already
 698                    done so above. */
 699                 if (!child->domain || winbindd_internal_child(child)) {
 700                         continue;
 701                 }
 702
 703                 /* Or internal domains (this should not be possible....) */
 704                 if (child->domain->internal) {
 705                         continue;
 706                 }
 707
 708                 /* Each winbindd child should only process requests for one domain - make sure
 709                    we only set it online / offline for that domain. */
 710
 711                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 712                         (unsigned int)child->pid, domain->name ));
 713
 714                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 715                                    MSG_WINBIND_OFFLINE,
 716                                    (uint8 *)child->domain->name,
 717                                    strlen(child->domain->name)+1);
 718         }
 719 }
 720
 721 /* Set our domains as online and forward the online message to our children. */
 722
 723 void winbind_msg_online(struct messaging_context *msg_ctx,
 724                         void *private_data,
 725                         uint32_t msg_type,
 726                         struct server_id server_id,
 727                         DATA_BLOB *data)
 728 {
 729         struct winbindd_child *child;
 730         struct winbindd_domain *domain;
 731
 732         DEBUG(10,("winbind_msg_online: got online message.\n"));
 733
 734         if (!lp_winbind_offline_logon()) {
 735                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 736                 return;
 737         }
 738
 739         /* Set our global state as online. */
 740         set_global_winbindd_state_online();
 741
 742         smb_nscd_flush_user_cache();
 743         smb_nscd_flush_group_cache();
 744
 745         /* Set all our domains as online. */
 746         for (domain = domain_list(); domain; domain = domain->next) {
 747                 if (domain->internal) {
 748                         continue;
 749                 }
 750                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 751
 752                 winbindd_flush_negative_conn_cache(domain);
 753                 set_domain_online_request(domain);
 754
 755                 /* Send an online message to the idmap child when our
 756                    primary domain comes back online */
 757
 758                 if ( domain->primary ) {
 759                         struct winbindd_child *idmap = idmap_child();
 760
 761                         if ( idmap->pid != 0 ) {
 762                                 messaging_send_buf(msg_ctx,
 763                                                    pid_to_procid(idmap->pid),
 764                                                    MSG_WINBIND_ONLINE,
 765                                                    (uint8 *)domain->name,
 766                                                    strlen(domain->name)+1);
 767                         }
 768                 }
 769         }
 770
 771         for (child = children; child != NULL; child = child->next) {
 772                 /* Don't send message to internal childs. */
 773                 if (!child->domain || winbindd_internal_child(child)) {
 774                         continue;
 775                 }
 776
 777                 /* Or internal domains (this should not be possible....) */
 778                 if (child->domain->internal) {
 779                         continue;
 780                 }
 781
 782                 /* Each winbindd child should only process requests for one domain - make sure
 783                    we only set it online / offline for that domain. */
 784
 785                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 786                         (unsigned int)child->pid, child->domain->name ));
 787
 788                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 789                                    MSG_WINBIND_ONLINE,
 790                                    (uint8 *)child->domain->name,
 791                                    strlen(child->domain->name)+1);
 792         }
 793 }
 794
 795 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 796 {
 797         struct winbindd_domain *domain;
 798         char *buf = NULL;
 799
 800         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 801                                    get_global_winbindd_state_offline() ?
 802                                    "Offline":"Online")) == NULL) {
 803                 return NULL;
 804         }
 805
 806         for (domain = domain_list(); domain; domain = domain->next) {
 807                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 808                                                   domain->name,
 809                                                   domain->online ?
 810                                                   "Online":"Offline")) == NULL) {
 811                         return NULL;
 812                 }
 813         }
 814
 815         buf = talloc_asprintf_append_buffer(buf, "\n");
 816
 817         DEBUG(5,("collect_onlinestatus: %s", buf));
 818
 819         return buf;
 820 }
 821
 822 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 823                               void *private_data,
 824                               uint32_t msg_type,
 825                               struct server_id server_id,
 826                               DATA_BLOB *data)
 827 {
 828         TALLOC_CTX *mem_ctx;
 829         const char *message;
 830         struct server_id *sender;
 831
 832         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 833
 834         if (!data->data) {
 835                 return;
 836         }
 837
 838         sender = (struct server_id *)data->data;
 839
 840         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 841         if (mem_ctx == NULL) {
 842                 return;
 843         }
 844
 845         message = collect_onlinestatus(mem_ctx);
 846         if (message == NULL) {
 847                 talloc_destroy(mem_ctx);
 848                 return;
 849         }
 850
 851         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 852                            (uint8 *)message, strlen(message) + 1);
 853
 854         talloc_destroy(mem_ctx);
 855 }
 856
 857 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 858                                  void *private_data,
 859                                  uint32_t msg_type,
 860                                  struct server_id server_id,
 861                                  DATA_BLOB *data)
 862 {
 863         struct winbindd_child *child;
 864
 865         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 866
 867         dump_event_list(winbind_event_context());
 868
 869         for (child = children; child != NULL; child = child->next) {
 870
 871                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 872                         (unsigned int)child->pid));
 873
 874                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 875                                    MSG_DUMP_EVENT_LIST,
 876                                    NULL, 0);
 877         }
 878
 879 }
 880
 881 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 882                                   void *private_data,
 883                                   uint32_t msg_type,
 884                                   struct server_id server_id,
 885                                   DATA_BLOB *data)
 886 {
 887         TALLOC_CTX *mem_ctx;
 888         const char *message = NULL;
 889         struct server_id *sender = NULL;
 890         const char *domain = NULL;
 891         char *s = NULL;
 892         NTSTATUS status;
 893         struct winbindd_domain *dom = NULL;
 894
 895         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 896
 897         if (!data || !data->data) {
 898                 return;
 899         }
 900
 901         if (data->length < sizeof(struct server_id)) {
 902                 return;
 903         }
 904
 905         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 906         if (!mem_ctx) {
 907                 return;
 908         }
 909
 910         sender = (struct server_id *)data->data;
 911         if (data->length > sizeof(struct server_id)) {
 912                 domain = (const char *)data->data+sizeof(struct server_id);
 913         }
 914
 915         if (domain) {
 916
 917                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 918                         domain));
 919
 920                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 921                                                   find_domain_from_name_noinit(domain));
 922                 if (!message) {
 923                         talloc_destroy(mem_ctx);
 924                         return;
 925                 }
 926
 927                 messaging_send_buf(msg_ctx, *sender,
 928                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 929                                    (uint8_t *)message, strlen(message) + 1);
 930
 931                 talloc_destroy(mem_ctx);
 932
 933                 return;
 934         }
 935
 936         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 937
 938         for (dom = domain_list(); dom; dom=dom->next) {
 939                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 940                 if (!message) {
 941                         talloc_destroy(mem_ctx);
 942                         return;
 943                 }
 944
 945                 s = talloc_asprintf_append(s, "%s\n", message);
 946                 if (!s) {
 947                         talloc_destroy(mem_ctx);
 948                         return;
 949                 }
 950         }
 951
 952         status = messaging_send_buf(msg_ctx, *sender,
 953                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 954                                     (uint8_t *)s, strlen(s) + 1);
 955         if (!NT_STATUS_IS_OK(status)) {
 956                 DEBUG(0,("failed to send message: %s\n",
 957                 nt_errstr(status)));
 958         }
 959
 960         talloc_destroy(mem_ctx);
 961 }
 962
 963 static void account_lockout_policy_handler(struct event_context *ctx,
 964                                            struct timed_event *te,
 965                                            struct timeval now,
 966                                            void *private_data)
 967 {
 968         struct winbindd_child *child =
 969                 (struct winbindd_child *)private_data;
 970         TALLOC_CTX *mem_ctx = NULL;
 971         struct winbindd_methods *methods;
 972         struct samr_DomInfo12 lockout_policy;
 973         NTSTATUS result;
 974
 975         DEBUG(10,("account_lockout_policy_handler called\n"));
 976
 977         TALLOC_FREE(child->lockout_policy_event);
 978
 979         if ( !winbindd_can_contact_domain( child->domain ) ) {
 980                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 981                           "do not have an incoming trust to domain %s\n",
 982                           child->domain->name));
 983
 984                 return;
 985         }
 986
 987         methods = child->domain->methods;
 988
 989         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 990         if (!mem_ctx) {
 991                 result = NT_STATUS_NO_MEMORY;
 992         } else {
 993                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 994         }
 995         TALLOC_FREE(mem_ctx);
 996
 997         if (!NT_STATUS_IS_OK(result)) {
 998                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 999                          nt_errstr(result)));
1000         }
1001
1002         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
1003                                                       timeval_current_ofs(3600, 0),
1004                                                       account_lockout_policy_handler,
1005                                                       child);
1006 }
1007
1008 static time_t get_machine_password_timeout(void)
1009 {
1010         /* until we have gpo support use lp setting */
1011         return lp_machine_password_timeout();
1012 }
1013
1014 static bool calculate_next_machine_pwd_change(const char *domain,
1015                                               struct timeval *t)
1016 {
1017         time_t pass_last_set_time;
1018         time_t timeout;
1019         time_t next_change;
1020         char *pw;
1021
1022         pw = secrets_fetch_machine_password(domain,
1023                                             &pass_last_set_time,
1024                                             NULL);
1025
1026         if (pw == NULL) {
1027                 DEBUG(0,("cannot fetch own machine password ????"));
1028                 return false;
1029         }
1030
1031         SAFE_FREE(pw);
1032
1033         timeout = get_machine_password_timeout();
1034         if (timeout == 0) {
1035                 DEBUG(10,("machine password never expires\n"));
1036                 return false;
1037         }
1038
1039         if (time(NULL) < (pass_last_set_time + timeout)) {
1040                 next_change = pass_last_set_time + timeout;
1041                 DEBUG(10,("machine password still valid until: %s\n",
1042                         http_timestring(talloc_tos(), next_change)));
1043                 *t = timeval_set(next_change, 0);
1044                 return true;
1045         }
1046
1047         DEBUG(10,("machine password expired, needs immediate change\n"));
1048
1049         *t = timeval_zero();
1050
1051         return true;
1052 }
1053
1054 static void machine_password_change_handler(struct event_context *ctx,
1055                                             struct timed_event *te,
1056                                             struct timeval now,
1057                                             void *private_data)
1058 {
1059         struct winbindd_child *child =
1060                 (struct winbindd_child *)private_data;
1061         struct rpc_pipe_client *netlogon_pipe = NULL;
1062         TALLOC_CTX *frame;
1063         NTSTATUS result;
1064         struct timeval next_change;
1065
1066         DEBUG(10,("machine_password_change_handler called\n"));
1067
1068         TALLOC_FREE(child->machine_password_change_event);
1069
1070         if (!calculate_next_machine_pwd_change(child->domain->name,
1071                                                &next_change)) {
1072                 return;
1073         }
1074
1075         if (!winbindd_can_contact_domain(child->domain)) {
1076                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
1077                           "do not have an incoming trust to domain %s\n",
1078                           child->domain->name));
1079                 return;
1080         }
1081
1082         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
1083         if (!NT_STATUS_IS_OK(result)) {
1084                 DEBUG(10,("machine_password_change_handler: "
1085                         "failed to connect netlogon pipe: %s\n",
1086                          nt_errstr(result)));
1087                 return;
1088         }
1089
1090         frame = talloc_stackframe();
1091
1092         result = trust_pw_find_change_and_store_it(netlogon_pipe,
1093                                                    frame,
1094                                                    child->domain->name);
1095         TALLOC_FREE(frame);
1096
1097         if (!NT_STATUS_IS_OK(result)) {
1098                 DEBUG(10,("machine_password_change_handler: "
1099                         "failed to change machine password: %s\n",
1100                          nt_errstr(result)));
1101         } else {
1102                 DEBUG(10,("machine_password_change_handler: "
1103                         "successfully changed machine password\n"));
1104         }
1105
1106         child->machine_password_change_event = event_add_timed(winbind_event_context(), NULL,
1107                                                               next_change,
1108                                                               machine_password_change_handler,
1109                                                               child);
1110 }
1111
1112 /* Deal with a request to go offline. */
1113
1114 static void child_msg_offline(struct messaging_context *msg,
1115                               void *private_data,
1116                               uint32_t msg_type,
1117                               struct server_id server_id,
1118                               DATA_BLOB *data)
1119 {
1120         struct winbindd_domain *domain;
1121         struct winbindd_domain *primary_domain = NULL;
1122         const char *domainname = (const char *)data->data;
1123
1124         if (data->data == NULL || data->length == 0) {
1125                 return;
1126         }
1127
1128         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1129
1130         if (!lp_winbind_offline_logon()) {
1131                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1132                 return;
1133         }
1134
1135         primary_domain = find_our_domain();
1136
1137         /* Mark the requested domain offline. */
1138
1139         for (domain = domain_list(); domain; domain = domain->next) {
1140                 if (domain->internal) {
1141                         continue;
1142                 }
1143                 if (strequal(domain->name, domainname)) {
1144                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1145                         set_domain_offline(domain);
1146                         /* we are in the trusted domain, set the primary domain
1147                          * offline too */
1148                         if (domain != primary_domain) {
1149                                 set_domain_offline(primary_domain);
1150                         }
1151                 }
1152         }
1153 }
1154
1155 /* Deal with a request to go online. */
1156
1157 static void child_msg_online(struct messaging_context *msg,
1158                              void *private_data,
1159                              uint32_t msg_type,
1160                              struct server_id server_id,
1161                              DATA_BLOB *data)
1162 {
1163         struct winbindd_domain *domain;
1164         struct winbindd_domain *primary_domain = NULL;
1165         const char *domainname = (const char *)data->data;
1166
1167         if (data->data == NULL || data->length == 0) {
1168                 return;
1169         }
1170
1171         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1172
1173         if (!lp_winbind_offline_logon()) {
1174                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1175                 return;
1176         }
1177
1178         primary_domain = find_our_domain();
1179
1180         /* Set our global state as online. */
1181         set_global_winbindd_state_online();
1182
1183         /* Try and mark everything online - delete any negative cache entries
1184            to force a reconnect now. */
1185
1186         for (domain = domain_list(); domain; domain = domain->next) {
1187                 if (domain->internal) {
1188                         continue;
1189                 }
1190                 if (strequal(domain->name, domainname)) {
1191                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1192                         winbindd_flush_negative_conn_cache(domain);
1193                         set_domain_online_request(domain);
1194
1195                         /* we can be in trusted domain, which will contact primary domain
1196                          * we have to bring primary domain online in trusted domain process
1197                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1198                          * --> contact_domain = find_our_domain()
1199                          * */
1200                         if (domain != primary_domain) {
1201                                 winbindd_flush_negative_conn_cache(primary_domain);
1202                                 set_domain_online_request(primary_domain);
1203                         }
1204                 }
1205         }
1206 }
1207
1208 static void child_msg_dump_event_list(struct messaging_context *msg,
1209                                       void *private_data,
1210                                       uint32_t msg_type,
1211                                       struct server_id server_id,
1212                                       DATA_BLOB *data)
1213 {
1214         DEBUG(5,("child_msg_dump_event_list received\n"));
1215
1216         dump_event_list(winbind_event_context());
1217 }
1218
1219 bool winbindd_reinit_after_fork(const char *logfilename)
1220 {
1221         struct winbindd_domain *domain;
1222         struct winbindd_child *cl;
1223
1224         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1225                                                winbind_event_context(),
1226                                                true))) {
1227                 DEBUG(0,("reinit_after_fork() failed\n"));
1228                 return false;
1229         }
1230
1231         close_conns_after_fork();
1232
1233         if (!override_logfile && logfilename) {
1234                 lp_set_logfile(logfilename);
1235                 reopen_logs();
1236         }
1237
1238         if (!winbindd_setup_sig_term_handler(false))
1239                 return false;
1240         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1241                                             logfilename))
1242                 return false;
1243
1244         /* Don't handle the same messages as our parent. */
1245         messaging_deregister(winbind_messaging_context(),
1246                              MSG_SMB_CONF_UPDATED, NULL);
1247         messaging_deregister(winbind_messaging_context(),
1248                              MSG_SHUTDOWN, NULL);
1249         messaging_deregister(winbind_messaging_context(),
1250                              MSG_WINBIND_OFFLINE, NULL);
1251         messaging_deregister(winbind_messaging_context(),
1252                              MSG_WINBIND_ONLINE, NULL);
1253         messaging_deregister(winbind_messaging_context(),
1254                              MSG_WINBIND_ONLINESTATUS, NULL);
1255         messaging_deregister(winbind_messaging_context(),
1256                              MSG_DUMP_EVENT_LIST, NULL);
1257         messaging_deregister(winbind_messaging_context(),
1258                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1259         messaging_deregister(winbind_messaging_context(),
1260                              MSG_DEBUG, NULL);
1261
1262         /* We have destroyed all events in the winbindd_event_context
1263          * in reinit_after_fork(), so clean out all possible pending
1264          * event pointers. */
1265
1266         /* Deal with check_online_events. */
1267
1268         for (domain = domain_list(); domain; domain = domain->next) {
1269                 TALLOC_FREE(domain->check_online_event);
1270         }
1271
1272         /* Ensure we're not handling a credential cache event inherited
1273          * from our parent. */
1274
1275         ccache_remove_all_after_fork();
1276
1277         /* Destroy all possible events in child list. */
1278         for (cl = children; cl != NULL; cl = cl->next) {
1279                 TALLOC_FREE(cl->lockout_policy_event);
1280                 TALLOC_FREE(cl->machine_password_change_event);
1281
1282                 /* Children should never be able to send
1283                  * each other messages, all messages must
1284                  * go through the parent.
1285                  */
1286                 cl->pid = (pid_t)0;
1287         }
1288         /*
1289          * This is a little tricky, children must not
1290          * send an MSG_WINBIND_ONLINE message to idmap_child().
1291          * If we are in a child of our primary domain or
1292          * in the process created by fork_child_dc_connect(),
1293          * and the primary domain cannot go online,
1294          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1295          * periodically to idmap_child().
1296          *
1297          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1298          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1299          * ---> init_dc_connection() ---> cm_open_connection --->
1300          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1301          * idmap_child(). Disallow children sending messages
1302          * to each other, all messages must go through the parent.
1303          */
1304         cl = idmap_child();
1305         cl->pid = (pid_t)0;
1306
1307         return true;
1308 }
1309
1310 static bool fork_domain_child(struct winbindd_child *child)
1311 {
1312         int fdpair[2];
1313         struct winbindd_cli_state state;
1314         struct winbindd_request request;
1315         struct winbindd_response response;
1316         struct winbindd_domain *primary_domain = NULL;
1317
1318         if (child->domain) {
1319                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1320                            child->domain->name));
1321         } else {
1322                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1323         }
1324
1325         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1326                 DEBUG(0, ("Could not open child pipe: %s\n",
1327                           strerror(errno)));
1328                 return False;
1329         }
1330
1331         ZERO_STRUCT(state);
1332         state.pid = sys_getpid();
1333         state.request = &request;
1334         state.response = &response;
1335
1336         child->pid = sys_fork();
1337
1338         if (child->pid == -1) {
1339                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1340                 return False;
1341         }
1342
1343         if (child->pid != 0) {
1344                 /* Parent */
1345                 close(fdpair[0]);
1346                 child->next = child->prev = NULL;
1347                 DLIST_ADD(children, child);
1348                 child->sock = fdpair[1];
1349                 return True;
1350         }
1351
1352         /* Child */
1353
1354         DEBUG(10, ("Child process %d\n", (int)sys_getpid()));
1355
1356         /* Stop zombies in children */
1357         CatchChild();
1358
1359         state.sock = fdpair[0];
1360         close(fdpair[1]);
1361
1362         if (!winbindd_reinit_after_fork(child->logfilename)) {
1363                 _exit(0);
1364         }
1365
1366         /* Handle online/offline messages. */
1367         messaging_register(winbind_messaging_context(), NULL,
1368                            MSG_WINBIND_OFFLINE, child_msg_offline);
1369         messaging_register(winbind_messaging_context(), NULL,
1370                            MSG_WINBIND_ONLINE, child_msg_online);
1371         messaging_register(winbind_messaging_context(), NULL,
1372                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1373         messaging_register(winbind_messaging_context(), NULL,
1374                            MSG_DEBUG, debug_message);
1375
1376         primary_domain = find_our_domain();
1377
1378         if (primary_domain == NULL) {
1379                 smb_panic("no primary domain found");
1380         }
1381
1382         /* It doesn't matter if we allow cache login,
1383          * try to bring domain online after fork. */
1384         if ( child->domain ) {
1385                 child->domain->startup = True;
1386                 child->domain->startup_time = time(NULL);
1387                 /* we can be in primary domain or in trusted domain
1388                  * If we are in trusted domain, set the primary domain
1389                  * in start-up mode */
1390                 if (!(child->domain->internal)) {
1391                         set_domain_online_request(child->domain);
1392                         if (!(child->domain->primary)) {
1393                                 primary_domain->startup = True;
1394                                 primary_domain->startup_time = time(NULL);
1395                                 set_domain_online_request(primary_domain);
1396                         }
1397                 }
1398         }
1399
1400         /*
1401          * We are in idmap child, make sure that we set the
1402          * check_online_event to bring primary domain online.
1403          */
1404         if (child == idmap_child()) {
1405                 set_domain_online_request(primary_domain);
1406         }
1407
1408         /* We might be in the idmap child...*/
1409         if (child->domain && !(child->domain->internal) &&
1410             lp_winbind_offline_logon()) {
1411
1412                 set_domain_online_request(child->domain);
1413
1414                 if (primary_domain && (primary_domain != child->domain)) {
1415                         /* We need to talk to the primary
1416                          * domain as well as the trusted
1417                          * domain inside a trusted domain
1418                          * child.
1419                          * See the code in :
1420                          * set_dc_type_and_flags_trustinfo()
1421                          * for details.
1422                          */
1423                         set_domain_online_request(primary_domain);
1424                 }
1425
1426                 child->lockout_policy_event = event_add_timed(
1427                         winbind_event_context(), NULL, timeval_zero(),
1428                         account_lockout_policy_handler,
1429                         child);
1430         }
1431
1432         if (child->domain && child->domain->primary &&
1433             !USE_KERBEROS_KEYTAB &&
1434             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1435
1436                 struct timeval next_change;
1437
1438                 if (calculate_next_machine_pwd_change(child->domain->name,
1439                                                        &next_change)) {
1440                         child->machine_password_change_event = event_add_timed(
1441                                 winbind_event_context(), NULL, next_change,
1442                                 machine_password_change_handler,
1443                                 child);
1444                 }
1445         }
1446
1447         while (1) {
1448
1449                 int ret;
1450                 fd_set r_fds;
1451                 fd_set w_fds;
1452                 int maxfd;
1453                 struct timeval t;
1454                 struct timeval *tp;
1455                 struct timeval now;
1456                 TALLOC_CTX *frame = talloc_stackframe();
1457                 struct iovec iov[2];
1458                 int iov_count;
1459                 NTSTATUS status;
1460
1461                 if (run_events(winbind_event_context(), 0, NULL, NULL)) {
1462                         TALLOC_FREE(frame);
1463                         continue;
1464                 }
1465
1466                 GetTimeOfDay(&now);
1467
1468                 if (child->domain && child->domain->startup &&
1469                                 (now.tv_sec > child->domain->startup_time + 30)) {
1470                         /* No longer in "startup" mode. */
1471                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1472                                 child->domain->name ));
1473                         child->domain->startup = False;
1474                 }
1475
1476                 FD_ZERO(&r_fds);
1477                 FD_ZERO(&w_fds);
1478                 FD_SET(state.sock, &r_fds);
1479                 maxfd = state.sock;
1480
1481                 event_add_to_select_args(winbind_event_context(), &now,
1482                                          &r_fds, &w_fds, &t, &maxfd);
1483                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1484                 if (tp) {
1485                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1486                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1487                 }
1488
1489                 ret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, tp);
1490
1491                 if (run_events(winbind_event_context(), ret, &r_fds, &w_fds)) {
1492                         /* We got a signal - continue. */
1493                         TALLOC_FREE(frame);
1494                         continue;
1495                 }
1496
1497                 if (ret == 0) {
1498                         DEBUG(11,("nothing is ready yet, continue\n"));
1499                         TALLOC_FREE(frame);
1500                         continue;
1501                 }
1502
1503                 if (ret == -1 && errno == EINTR) {
1504                         /* We got a signal - continue. */
1505                         TALLOC_FREE(frame);
1506                         continue;
1507                 }
1508
1509                 if (ret == -1 && errno != EINTR) {
1510                         DEBUG(0,("select error occured\n"));
1511                         TALLOC_FREE(frame);
1512                         perror("select");
1513                         _exit(1);
1514                 }
1515
1516                 /* fetch a request from the main daemon */
1517                 status = child_read_request(&state);
1518
1519                 if (!NT_STATUS_IS_OK(status)) {
1520                         /* we lost contact with our parent */
1521                         _exit(0);
1522                 }
1523
1524                 DEBUG(4,("child daemon request %d\n", (int)state.request->cmd));
1525
1526                 ZERO_STRUCTP(state.response);
1527                 state.request->null_term = '\0';
1528                 state.mem_ctx = frame;
1529                 child_process_request(child, &state);
1530
1531                 DEBUG(4, ("Finished processing child request %d\n",
1532                           (int)state.request->cmd));
1533
1534                 SAFE_FREE(state.request->extra_data.data);
1535
1536                 iov[0].iov_base = (void *)state.response;
1537                 iov[0].iov_len = sizeof(struct winbindd_response);
1538                 iov_count = 1;
1539
1540                 if (state.response->length > sizeof(struct winbindd_response)) {
1541                         iov[1].iov_base =
1542                                 (void *)state.response->extra_data.data;
1543                         iov[1].iov_len = state.response->length-iov[0].iov_len;
1544                         iov_count = 2;
1545                 }
1546
1547                 DEBUG(10, ("Writing %d bytes to parent\n",
1548                            (int)state.response->length));
1549
1550                 if (write_data_iov(state.sock, iov, iov_count) !=
1551                     state.response->length) {
1552                         DEBUG(0, ("Could not write result\n"));
1553                         exit(1);
1554                 }
1555                 TALLOC_FREE(frame);
1556         }
1557 }