source3/winbindd/winbindd_dual.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind child daemons
   5
   6    Copyright (C) Andrew Tridgell 2002
   7    Copyright (C) Volker Lendecke 2004,2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  * We fork a child per domain to be able to act non-blocking in the main
  25  * winbind daemon. A domain controller thousands of miles away being being
  26  * slow replying with a 10.000 user list should not hold up netlogon calls
  27  * that can be handled locally.
  28  */
  29
  30 #include "includes.h"
  31 #include "winbindd.h"
  32 #include "../../nsswitch/libwbclient/wbc_async.h"
  33 #include "librpc/gen_ndr/messaging.h"
  34 #include "secrets.h"
  35
  36 #undef DBGC_CLASS
  37 #define DBGC_CLASS DBGC_WINBIND
  38
  39 extern bool override_logfile;
  40 extern struct winbindd_methods cache_methods;
  41
  42 /* Read some data from a client connection */
  43
  44 static NTSTATUS child_read_request(struct winbindd_cli_state *state)
  45 {
  46         NTSTATUS status;
  47
  48         /* Read data */
  49
  50         status = read_data(state->sock, (char *)state->request,
  51                            sizeof(*state->request));
  52
  53         if (!NT_STATUS_IS_OK(status)) {
  54                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  55                           nt_errstr(status)));
  56                 return status;
  57         }
  58
  59         if (state->request->extra_len == 0) {
  60                 state->request->extra_data.data = NULL;
  61                 return NT_STATUS_OK;
  62         }
  63
  64         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request->extra_len));
  65
  66         state->request->extra_data.data =
  67                 SMB_MALLOC_ARRAY(char, state->request->extra_len + 1);
  68
  69         if (state->request->extra_data.data == NULL) {
  70                 DEBUG(0, ("malloc failed\n"));
  71                 return NT_STATUS_NO_MEMORY;
  72         }
  73
  74         /* Ensure null termination */
  75         state->request->extra_data.data[state->request->extra_len] = '\0';
  76
  77         status= read_data(state->sock, state->request->extra_data.data,
  78                           state->request->extra_len);
  79
  80         if (!NT_STATUS_IS_OK(status)) {
  81                 DEBUG(0, ("Could not read extra data: %s\n",
  82                           nt_errstr(status)));
  83         }
  84         return status;
  85 }
  86
  87 /*
  88  * Do winbind child async request. This is not simply wb_simple_trans. We have
  89  * to do the queueing ourselves because while a request is queued, the child
  90  * might have crashed, and we have to re-fork it in the _trigger function.
  91  */
  92
  93 struct wb_child_request_state {
  94         struct tevent_context *ev;
  95         struct winbindd_child *child;
  96         struct winbindd_request *request;
  97         struct winbindd_response *response;
  98 };
  99
 100 static bool fork_domain_child(struct winbindd_child *child);
 101
 102 static void wb_child_request_trigger(struct tevent_req *req,
 103                                             void *private_data);
 104 static void wb_child_request_done(struct tevent_req *subreq);
 105
 106 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
 107                                          struct tevent_context *ev,
 108                                          struct winbindd_child *child,
 109                                          struct winbindd_request *request)
 110 {
 111         struct tevent_req *req;
 112         struct wb_child_request_state *state;
 113
 114         req = tevent_req_create(mem_ctx, &state,
 115                                 struct wb_child_request_state);
 116         if (req == NULL) {
 117                 return NULL;
 118         }
 119
 120         state->ev = ev;
 121         state->child = child;
 122         state->request = request;
 123
 124         if (!tevent_queue_add(child->queue, ev, req,
 125                               wb_child_request_trigger, NULL)) {
 126                 tevent_req_nomem(NULL, req);
 127                 return tevent_req_post(req, ev);
 128         }
 129         return req;
 130 }
 131
 132 static void wb_child_request_trigger(struct tevent_req *req,
 133                                      void *private_data)
 134 {
 135         struct wb_child_request_state *state = tevent_req_data(
 136                 req, struct wb_child_request_state);
 137         struct tevent_req *subreq;
 138
 139         if ((state->child->pid == 0) && (!fork_domain_child(state->child))) {
 140                 tevent_req_error(req, errno);
 141                 return;
 142         }
 143
 144         subreq = wb_simple_trans_send(state, winbind_event_context(), NULL,
 145                                       state->child->sock, state->request);
 146         if (tevent_req_nomem(subreq, req)) {
 147                 return;
 148         }
 149         tevent_req_set_callback(subreq, wb_child_request_done, req);
 150
 151         if (!tevent_req_set_endtime(req, state->ev,
 152                                     timeval_current_ofs(300, 0))) {
 153                 tevent_req_nomem(NULL, req);
 154                 return;
 155         }
 156 }
 157
 158 static void wb_child_request_done(struct tevent_req *subreq)
 159 {
 160         struct tevent_req *req = tevent_req_callback_data(
 161                 subreq, struct tevent_req);
 162         struct wb_child_request_state *state = tevent_req_data(
 163                 req, struct wb_child_request_state);
 164         int ret, err;
 165
 166         ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
 167         TALLOC_FREE(subreq);
 168         if (ret == -1) {
 169                 tevent_req_error(req, err);
 170                 return;
 171         }
 172         tevent_req_done(req);
 173 }
 174
 175 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 176                           struct winbindd_response **presponse, int *err)
 177 {
 178         struct wb_child_request_state *state = tevent_req_data(
 179                 req, struct wb_child_request_state);
 180
 181         if (tevent_req_is_unix_error(req, err)) {
 182                 return -1;
 183         }
 184         *presponse = talloc_move(mem_ctx, &state->response);
 185         return 0;
 186 }
 187
 188 struct wb_domain_request_state {
 189         struct tevent_context *ev;
 190         struct winbindd_domain *domain;
 191         struct winbindd_request *request;
 192         struct winbindd_request *init_req;
 193         struct winbindd_response *response;
 194 };
 195
 196 static void wb_domain_request_gotdc(struct tevent_req *subreq);
 197 static void wb_domain_request_initialized(struct tevent_req *subreq);
 198 static void wb_domain_request_done(struct tevent_req *subreq);
 199
 200 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
 201                                           struct tevent_context *ev,
 202                                           struct winbindd_domain *domain,
 203                                           struct winbindd_request *request)
 204 {
 205         struct tevent_req *req, *subreq;
 206         struct wb_domain_request_state *state;
 207
 208         req = tevent_req_create(mem_ctx, &state,
 209                                 struct wb_domain_request_state);
 210         if (req == NULL) {
 211                 return NULL;
 212         }
 213
 214         if (domain->initialized) {
 215                 subreq = wb_child_request_send(state, ev, &domain->child,
 216                                                request);
 217                 if (tevent_req_nomem(subreq, req)) {
 218                         return tevent_req_post(req, ev);
 219                 }
 220                 tevent_req_set_callback(subreq, wb_domain_request_done, req);
 221                 return req;
 222         }
 223
 224         state->domain = domain;
 225         state->ev = ev;
 226         state->request = request;
 227
 228         state->init_req = talloc_zero(state, struct winbindd_request);
 229         if (tevent_req_nomem(state->init_req, req)) {
 230                 return tevent_req_post(req, ev);
 231         }
 232
 233         if (IS_DC || domain->primary || domain->internal) {
 234                 /* The primary domain has to find the DC name itself */
 235                 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 236                 fstrcpy(state->init_req->domain_name, domain->name);
 237                 state->init_req->data.init_conn.is_primary =
 238                         domain->primary ? true : false;
 239                 fstrcpy(state->init_req->data.init_conn.dcname, "");
 240
 241                 subreq = wb_child_request_send(state, ev, &domain->child,
 242                                                state->init_req);
 243                 if (tevent_req_nomem(subreq, req)) {
 244                         return tevent_req_post(req, ev);
 245                 }
 246                 tevent_req_set_callback(subreq, wb_domain_request_initialized,
 247                                         req);
 248                 return req;
 249         }
 250
 251         /*
 252          * Ask our DC for a DC name
 253          */
 254         domain = find_our_domain();
 255
 256         /* This is *not* the primary domain, let's ask our DC about a DC
 257          * name */
 258
 259         state->init_req->cmd = WINBINDD_GETDCNAME;
 260         fstrcpy(state->init_req->domain_name, domain->name);
 261
 262         subreq = wb_child_request_send(state, ev, &domain->child, request);
 263         if (tevent_req_nomem(subreq, req)) {
 264                 return tevent_req_post(req, ev);
 265         }
 266         tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
 267         return req;
 268 }
 269
 270 static void wb_domain_request_gotdc(struct tevent_req *subreq)
 271 {
 272         struct tevent_req *req = tevent_req_callback_data(
 273                 subreq, struct tevent_req);
 274         struct wb_domain_request_state *state = tevent_req_data(
 275                 req, struct wb_domain_request_state);
 276         struct winbindd_response *response;
 277         int ret, err;
 278
 279         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 280         TALLOC_FREE(subreq);
 281         if (ret == -1) {
 282                 tevent_req_error(req, err);
 283                 return;
 284         }
 285         state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 286         fstrcpy(state->init_req->domain_name, state->domain->name);
 287         state->init_req->data.init_conn.is_primary = False;
 288         fstrcpy(state->init_req->data.init_conn.dcname,
 289                 response->data.dc_name);
 290
 291         TALLOC_FREE(response);
 292
 293         subreq = wb_child_request_send(state, state->ev, &state->domain->child,
 294                                        state->init_req);
 295         if (tevent_req_nomem(subreq, req)) {
 296                 return;
 297         }
 298         tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
 299 }
 300
 301 static void wb_domain_request_initialized(struct tevent_req *subreq)
 302 {
 303         struct tevent_req *req = tevent_req_callback_data(
 304                 subreq, struct tevent_req);
 305         struct wb_domain_request_state *state = tevent_req_data(
 306                 req, struct wb_domain_request_state);
 307         struct winbindd_response *response;
 308         int ret, err;
 309
 310         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 311         TALLOC_FREE(subreq);
 312         if (ret == -1) {
 313                 tevent_req_error(req, err);
 314                 return;
 315         }
 316
 317         if (!string_to_sid(&state->domain->sid,
 318                            response->data.domain_info.sid)) {
 319                 DEBUG(1,("init_child_recv: Could not convert sid %s "
 320                         "from string\n", response->data.domain_info.sid));
 321                 tevent_req_error(req, EINVAL);
 322                 return;
 323         }
 324         fstrcpy(state->domain->name, response->data.domain_info.name);
 325         fstrcpy(state->domain->alt_name, response->data.domain_info.alt_name);
 326         state->domain->native_mode = response->data.domain_info.native_mode;
 327         state->domain->active_directory =
 328                 response->data.domain_info.active_directory;
 329         state->domain->initialized = true;
 330
 331         TALLOC_FREE(response);
 332
 333         subreq = wb_child_request_send(state, state->ev, &state->domain->child,
 334                                        state->request);
 335         if (tevent_req_nomem(subreq, req)) {
 336                 return;
 337         }
 338         tevent_req_set_callback(subreq, wb_domain_request_done, req);
 339 }
 340
 341 static void wb_domain_request_done(struct tevent_req *subreq)
 342 {
 343         struct tevent_req *req = tevent_req_callback_data(
 344                 subreq, struct tevent_req);
 345         struct wb_domain_request_state *state = tevent_req_data(
 346                 req, struct wb_domain_request_state);
 347         int ret, err;
 348
 349         ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
 350                                     &err);
 351         TALLOC_FREE(subreq);
 352         if (ret == -1) {
 353                 tevent_req_error(req, err);
 354                 return;
 355         }
 356         tevent_req_done(req);
 357 }
 358
 359 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 360                            struct winbindd_response **presponse, int *err)
 361 {
 362         struct wb_domain_request_state *state = tevent_req_data(
 363                 req, struct wb_domain_request_state);
 364
 365         if (tevent_req_is_unix_error(req, err)) {
 366                 return -1;
 367         }
 368         *presponse = talloc_move(mem_ctx, &state->response);
 369         return 0;
 370 }
 371
 372 static void child_process_request(struct winbindd_child *child,
 373                                   struct winbindd_cli_state *state)
 374 {
 375         struct winbindd_domain *domain = child->domain;
 376         const struct winbindd_child_dispatch_table *table = child->table;
 377
 378         /* Free response data - we may be interrupted and receive another
 379            command before being able to send this data off. */
 380
 381         state->response->result = WINBINDD_ERROR;
 382         state->response->length = sizeof(struct winbindd_response);
 383
 384         /* as all requests in the child are sync, we can use talloc_tos() */
 385         state->mem_ctx = talloc_tos();
 386
 387         /* Process command */
 388
 389         for (; table->name; table++) {
 390                 if (state->request->cmd == table->struct_cmd) {
 391                         DEBUG(10,("child_process_request: request fn %s\n",
 392                                   table->name));
 393                         state->response->result = table->struct_fn(domain, state);
 394                         return;
 395                 }
 396         }
 397
 398         DEBUG(1 ,("child_process_request: unknown request fn number %d\n",
 399                   (int)state->request->cmd));
 400         state->response->result = WINBINDD_ERROR;
 401 }
 402
 403 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 404                  const struct winbindd_child_dispatch_table *table,
 405                  const char *logprefix,
 406                  const char *logname)
 407 {
 408         if (logprefix && logname) {
 409                 char *logbase = NULL;
 410
 411                 if (*lp_logfile()) {
 412                         char *end = NULL;
 413
 414                         if (asprintf(&logbase, "%s", lp_logfile()) < 0) {
 415                                 smb_panic("Internal error: asprintf failed");
 416                         }
 417
 418                         if ((end = strrchr_m(logbase, '/'))) {
 419                                 *end = '\0';
 420                         }
 421                 } else {
 422                         if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
 423                                 smb_panic("Internal error: asprintf failed");
 424                         }
 425                 }
 426
 427                 if (asprintf(&child->logfilename, "%s/%s-%s",
 428                              logbase, logprefix, logname) < 0) {
 429                         SAFE_FREE(logbase);
 430                         smb_panic("Internal error: asprintf failed");
 431                 }
 432
 433                 SAFE_FREE(logbase);
 434         } else {
 435                 smb_panic("Internal error: logprefix == NULL && "
 436                           "logname == NULL");
 437         }
 438
 439         child->domain = domain;
 440         child->table = table;
 441         child->queue = tevent_queue_create(NULL, "winbind_child");
 442         SMB_ASSERT(child->queue != NULL);
 443         child->rpccli = wbint_rpccli_create(NULL, domain, child);
 444         SMB_ASSERT(child->rpccli != NULL);
 445 }
 446
 447 static struct winbindd_child *winbindd_children = NULL;
 448
 449 void winbind_child_died(pid_t pid)
 450 {
 451         struct winbindd_child *child;
 452
 453         for (child = winbindd_children; child != NULL; child = child->next) {
 454                 if (child->pid == pid) {
 455                         break;
 456                 }
 457         }
 458
 459         if (child == NULL) {
 460                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 461                 return;
 462         }
 463
 464         /* This will be re-added in fork_domain_child() */
 465
 466         DLIST_REMOVE(winbindd_children, child);
 467
 468         close(child->sock);
 469         child->sock = -1;
 470         child->pid = 0;
 471 }
 472
 473 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 474
 475 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 476 {
 477         flush_negative_conn_cache_for_domain(domain->name);
 478         if (*domain->alt_name) {
 479                 flush_negative_conn_cache_for_domain(domain->alt_name);
 480         }
 481 }
 482
 483 /*
 484  * Parent winbindd process sets its own debug level first and then
 485  * sends a message to all the winbindd children to adjust their debug
 486  * level to that of parents.
 487  */
 488
 489 void winbind_msg_debug(struct messaging_context *msg_ctx,
 490                          void *private_data,
 491                          uint32_t msg_type,
 492                          struct server_id server_id,
 493                          DATA_BLOB *data)
 494 {
 495         struct winbindd_child *child;
 496
 497         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 498
 499         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 500
 501         for (child = winbindd_children; child != NULL; child = child->next) {
 502
 503                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 504                         (unsigned int)child->pid));
 505
 506                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 507                            MSG_DEBUG,
 508                            data->data,
 509                            strlen((char *) data->data) + 1);
 510         }
 511 }
 512
 513 /* Set our domains as offline and forward the offline message to our children. */
 514
 515 void winbind_msg_offline(struct messaging_context *msg_ctx,
 516                          void *private_data,
 517                          uint32_t msg_type,
 518                          struct server_id server_id,
 519                          DATA_BLOB *data)
 520 {
 521         struct winbindd_child *child;
 522         struct winbindd_domain *domain;
 523
 524         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 525
 526         if (!lp_winbind_offline_logon()) {
 527                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 528                 return;
 529         }
 530
 531         /* Set our global state as offline. */
 532         if (!set_global_winbindd_state_offline()) {
 533                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 534                 return;
 535         }
 536
 537         /* Set all our domains as offline. */
 538         for (domain = domain_list(); domain; domain = domain->next) {
 539                 if (domain->internal) {
 540                         continue;
 541                 }
 542                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 543                 set_domain_offline(domain);
 544         }
 545
 546         for (child = winbindd_children; child != NULL; child = child->next) {
 547                 /* Don't send message to internal children.  We've already
 548                    done so above. */
 549                 if (!child->domain || winbindd_internal_child(child)) {
 550                         continue;
 551                 }
 552
 553                 /* Or internal domains (this should not be possible....) */
 554                 if (child->domain->internal) {
 555                         continue;
 556                 }
 557
 558                 /* Each winbindd child should only process requests for one domain - make sure
 559                    we only set it online / offline for that domain. */
 560
 561                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 562                         (unsigned int)child->pid, domain->name ));
 563
 564                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 565                                    MSG_WINBIND_OFFLINE,
 566                                    (uint8 *)child->domain->name,
 567                                    strlen(child->domain->name)+1);
 568         }
 569 }
 570
 571 /* Set our domains as online and forward the online message to our children. */
 572
 573 void winbind_msg_online(struct messaging_context *msg_ctx,
 574                         void *private_data,
 575                         uint32_t msg_type,
 576                         struct server_id server_id,
 577                         DATA_BLOB *data)
 578 {
 579         struct winbindd_child *child;
 580         struct winbindd_domain *domain;
 581
 582         DEBUG(10,("winbind_msg_online: got online message.\n"));
 583
 584         if (!lp_winbind_offline_logon()) {
 585                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 586                 return;
 587         }
 588
 589         /* Set our global state as online. */
 590         set_global_winbindd_state_online();
 591
 592         smb_nscd_flush_user_cache();
 593         smb_nscd_flush_group_cache();
 594
 595         /* Set all our domains as online. */
 596         for (domain = domain_list(); domain; domain = domain->next) {
 597                 if (domain->internal) {
 598                         continue;
 599                 }
 600                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 601
 602                 winbindd_flush_negative_conn_cache(domain);
 603                 set_domain_online_request(domain);
 604
 605                 /* Send an online message to the idmap child when our
 606                    primary domain comes back online */
 607
 608                 if ( domain->primary ) {
 609                         struct winbindd_child *idmap = idmap_child();
 610
 611                         if ( idmap->pid != 0 ) {
 612                                 messaging_send_buf(msg_ctx,
 613                                                    pid_to_procid(idmap->pid),
 614                                                    MSG_WINBIND_ONLINE,
 615                                                    (uint8 *)domain->name,
 616                                                    strlen(domain->name)+1);
 617                         }
 618                 }
 619         }
 620
 621         for (child = winbindd_children; child != NULL; child = child->next) {
 622                 /* Don't send message to internal childs. */
 623                 if (!child->domain || winbindd_internal_child(child)) {
 624                         continue;
 625                 }
 626
 627                 /* Or internal domains (this should not be possible....) */
 628                 if (child->domain->internal) {
 629                         continue;
 630                 }
 631
 632                 /* Each winbindd child should only process requests for one domain - make sure
 633                    we only set it online / offline for that domain. */
 634
 635                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 636                         (unsigned int)child->pid, child->domain->name ));
 637
 638                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 639                                    MSG_WINBIND_ONLINE,
 640                                    (uint8 *)child->domain->name,
 641                                    strlen(child->domain->name)+1);
 642         }
 643 }
 644
 645 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 646 {
 647         struct winbindd_domain *domain;
 648         char *buf = NULL;
 649
 650         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 651                                    get_global_winbindd_state_offline() ?
 652                                    "Offline":"Online")) == NULL) {
 653                 return NULL;
 654         }
 655
 656         for (domain = domain_list(); domain; domain = domain->next) {
 657                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 658                                                   domain->name,
 659                                                   domain->online ?
 660                                                   "Online":"Offline")) == NULL) {
 661                         return NULL;
 662                 }
 663         }
 664
 665         buf = talloc_asprintf_append_buffer(buf, "\n");
 666
 667         DEBUG(5,("collect_onlinestatus: %s", buf));
 668
 669         return buf;
 670 }
 671
 672 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 673                               void *private_data,
 674                               uint32_t msg_type,
 675                               struct server_id server_id,
 676                               DATA_BLOB *data)
 677 {
 678         TALLOC_CTX *mem_ctx;
 679         const char *message;
 680         struct server_id *sender;
 681
 682         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 683
 684         if (!data->data) {
 685                 return;
 686         }
 687
 688         sender = (struct server_id *)data->data;
 689
 690         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 691         if (mem_ctx == NULL) {
 692                 return;
 693         }
 694
 695         message = collect_onlinestatus(mem_ctx);
 696         if (message == NULL) {
 697                 talloc_destroy(mem_ctx);
 698                 return;
 699         }
 700
 701         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 702                            (uint8 *)message, strlen(message) + 1);
 703
 704         talloc_destroy(mem_ctx);
 705 }
 706
 707 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 708                                  void *private_data,
 709                                  uint32_t msg_type,
 710                                  struct server_id server_id,
 711                                  DATA_BLOB *data)
 712 {
 713         struct winbindd_child *child;
 714
 715         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 716
 717         dump_event_list(winbind_event_context());
 718
 719         for (child = winbindd_children; child != NULL; child = child->next) {
 720
 721                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 722                         (unsigned int)child->pid));
 723
 724                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 725                                    MSG_DUMP_EVENT_LIST,
 726                                    NULL, 0);
 727         }
 728
 729 }
 730
 731 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 732                                   void *private_data,
 733                                   uint32_t msg_type,
 734                                   struct server_id server_id,
 735                                   DATA_BLOB *data)
 736 {
 737         TALLOC_CTX *mem_ctx;
 738         const char *message = NULL;
 739         struct server_id *sender = NULL;
 740         const char *domain = NULL;
 741         char *s = NULL;
 742         NTSTATUS status;
 743         struct winbindd_domain *dom = NULL;
 744
 745         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 746
 747         if (!data || !data->data) {
 748                 return;
 749         }
 750
 751         if (data->length < sizeof(struct server_id)) {
 752                 return;
 753         }
 754
 755         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 756         if (!mem_ctx) {
 757                 return;
 758         }
 759
 760         sender = (struct server_id *)data->data;
 761         if (data->length > sizeof(struct server_id)) {
 762                 domain = (const char *)data->data+sizeof(struct server_id);
 763         }
 764
 765         if (domain) {
 766
 767                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 768                         domain));
 769
 770                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 771                                                   find_domain_from_name_noinit(domain));
 772                 if (!message) {
 773                         talloc_destroy(mem_ctx);
 774                         return;
 775                 }
 776
 777                 messaging_send_buf(msg_ctx, *sender,
 778                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 779                                    (uint8_t *)message, strlen(message) + 1);
 780
 781                 talloc_destroy(mem_ctx);
 782
 783                 return;
 784         }
 785
 786         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 787
 788         for (dom = domain_list(); dom; dom=dom->next) {
 789                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 790                 if (!message) {
 791                         talloc_destroy(mem_ctx);
 792                         return;
 793                 }
 794
 795                 s = talloc_asprintf_append(s, "%s\n", message);
 796                 if (!s) {
 797                         talloc_destroy(mem_ctx);
 798                         return;
 799                 }
 800         }
 801
 802         status = messaging_send_buf(msg_ctx, *sender,
 803                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 804                                     (uint8_t *)s, strlen(s) + 1);
 805         if (!NT_STATUS_IS_OK(status)) {
 806                 DEBUG(0,("failed to send message: %s\n",
 807                 nt_errstr(status)));
 808         }
 809
 810         talloc_destroy(mem_ctx);
 811 }
 812
 813 static void account_lockout_policy_handler(struct event_context *ctx,
 814                                            struct timed_event *te,
 815                                            struct timeval now,
 816                                            void *private_data)
 817 {
 818         struct winbindd_child *child =
 819                 (struct winbindd_child *)private_data;
 820         TALLOC_CTX *mem_ctx = NULL;
 821         struct winbindd_methods *methods;
 822         struct samr_DomInfo12 lockout_policy;
 823         NTSTATUS result;
 824
 825         DEBUG(10,("account_lockout_policy_handler called\n"));
 826
 827         TALLOC_FREE(child->lockout_policy_event);
 828
 829         if ( !winbindd_can_contact_domain( child->domain ) ) {
 830                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 831                           "do not have an incoming trust to domain %s\n",
 832                           child->domain->name));
 833
 834                 return;
 835         }
 836
 837         methods = child->domain->methods;
 838
 839         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 840         if (!mem_ctx) {
 841                 result = NT_STATUS_NO_MEMORY;
 842         } else {
 843                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 844         }
 845         TALLOC_FREE(mem_ctx);
 846
 847         if (!NT_STATUS_IS_OK(result)) {
 848                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 849                          nt_errstr(result)));
 850         }
 851
 852         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 853                                                       timeval_current_ofs(3600, 0),
 854                                                       account_lockout_policy_handler,
 855                                                       child);
 856 }
 857
 858 static time_t get_machine_password_timeout(void)
 859 {
 860         /* until we have gpo support use lp setting */
 861         return lp_machine_password_timeout();
 862 }
 863
 864 static bool calculate_next_machine_pwd_change(const char *domain,
 865                                               struct timeval *t)
 866 {
 867         time_t pass_last_set_time;
 868         time_t timeout;
 869         time_t next_change;
 870         struct timeval tv;
 871         char *pw;
 872
 873         pw = secrets_fetch_machine_password(domain,
 874                                             &pass_last_set_time,
 875                                             NULL);
 876
 877         if (pw == NULL) {
 878                 DEBUG(0,("cannot fetch own machine password ????"));
 879                 return false;
 880         }
 881
 882         SAFE_FREE(pw);
 883
 884         timeout = get_machine_password_timeout();
 885         if (timeout == 0) {
 886                 DEBUG(10,("machine password never expires\n"));
 887                 return false;
 888         }
 889
 890         tv.tv_sec = pass_last_set_time;
 891         DEBUG(10, ("password last changed %s\n",
 892                    timeval_string(talloc_tos(), &tv, false)));
 893         tv.tv_sec += timeout;
 894         DEBUGADD(10, ("password valid until %s\n",
 895                       timeval_string(talloc_tos(), &tv, false)));
 896
 897         if (time(NULL) < (pass_last_set_time + timeout)) {
 898                 next_change = pass_last_set_time + timeout;
 899                 DEBUG(10,("machine password still valid until: %s\n",
 900                         http_timestring(talloc_tos(), next_change)));
 901                 *t = timeval_set(next_change, 0);
 902
 903                 if (lp_clustering()) {
 904                         uint8_t randbuf;
 905                         /*
 906                          * When having a cluster, we have several
 907                          * winbinds racing for the password change. In
 908                          * the machine_password_change_handler()
 909                          * function we check if someone else was
 910                          * faster when the event triggers. We add a
 911                          * 255-second random delay here, so that we
 912                          * don't run to change the password at the
 913                          * exact same moment.
 914                          */
 915                         generate_random_buffer(&randbuf, sizeof(randbuf));
 916                         DEBUG(10, ("adding %d seconds randomness\n",
 917                                    (int)randbuf));
 918                         t->tv_sec += randbuf;
 919                 }
 920                 return true;
 921         }
 922
 923         DEBUG(10,("machine password expired, needs immediate change\n"));
 924
 925         *t = timeval_zero();
 926
 927         return true;
 928 }
 929
 930 static void machine_password_change_handler(struct event_context *ctx,
 931                                             struct timed_event *te,
 932                                             struct timeval now,
 933                                             void *private_data)
 934 {
 935         struct winbindd_child *child =
 936                 (struct winbindd_child *)private_data;
 937         struct rpc_pipe_client *netlogon_pipe = NULL;
 938         TALLOC_CTX *frame;
 939         NTSTATUS result;
 940         struct timeval next_change;
 941
 942         DEBUG(10,("machine_password_change_handler called\n"));
 943
 944         TALLOC_FREE(child->machine_password_change_event);
 945
 946         if (!calculate_next_machine_pwd_change(child->domain->name,
 947                                                &next_change)) {
 948                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
 949                 return;
 950         }
 951
 952         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
 953                    timeval_string(talloc_tos(), &next_change, false)));
 954
 955         if (!timeval_expired(&next_change)) {
 956                 DEBUG(10, ("Someone else has already changed the pw\n"));
 957                 goto done;
 958         }
 959
 960         if (!winbindd_can_contact_domain(child->domain)) {
 961                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
 962                           "do not have an incoming trust to domain %s\n",
 963                           child->domain->name));
 964                 return;
 965         }
 966
 967         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
 968         if (!NT_STATUS_IS_OK(result)) {
 969                 DEBUG(10,("machine_password_change_handler: "
 970                         "failed to connect netlogon pipe: %s\n",
 971                          nt_errstr(result)));
 972                 return;
 973         }
 974
 975         frame = talloc_stackframe();
 976
 977         result = trust_pw_find_change_and_store_it(netlogon_pipe,
 978                                                    frame,
 979                                                    child->domain->name);
 980         TALLOC_FREE(frame);
 981
 982         DEBUG(10, ("machine_password_change_handler: "
 983                    "trust_pw_find_change_and_store_it returned %s\n",
 984                    nt_errstr(result)));
 985
 986         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
 987                 DEBUG(3,("machine_password_change_handler: password set returned "
 988                          "ACCESS_DENIED.  Maybe the trust account "
 989                          "password was changed and we didn't know it. "
 990                          "Killing connections to domain %s\n",
 991                          child->domain->name));
 992                 TALLOC_FREE(child->domain->conn.netlogon_pipe);
 993         }
 994
 995         if (!calculate_next_machine_pwd_change(child->domain->name,
 996                                                &next_change)) {
 997                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
 998                 return;
 999         }
1000
1001         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1002                    timeval_string(talloc_tos(), &next_change, false)));
1003
1004         if (!NT_STATUS_IS_OK(result)) {
1005                 struct timeval tmp;
1006                 /*
1007                  * In case of failure, give the DC a minute to recover
1008                  */
1009                 tmp = timeval_current_ofs(60, 0);
1010                 next_change = timeval_max(&next_change, &tmp);
1011         }
1012
1013 done:
1014         child->machine_password_change_event = event_add_timed(winbind_event_context(), NULL,
1015                                                               next_change,
1016                                                               machine_password_change_handler,
1017                                                               child);
1018 }
1019
1020 /* Deal with a request to go offline. */
1021
1022 static void child_msg_offline(struct messaging_context *msg,
1023                               void *private_data,
1024                               uint32_t msg_type,
1025                               struct server_id server_id,
1026                               DATA_BLOB *data)
1027 {
1028         struct winbindd_domain *domain;
1029         struct winbindd_domain *primary_domain = NULL;
1030         const char *domainname = (const char *)data->data;
1031
1032         if (data->data == NULL || data->length == 0) {
1033                 return;
1034         }
1035
1036         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1037
1038         if (!lp_winbind_offline_logon()) {
1039                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1040                 return;
1041         }
1042
1043         primary_domain = find_our_domain();
1044
1045         /* Mark the requested domain offline. */
1046
1047         for (domain = domain_list(); domain; domain = domain->next) {
1048                 if (domain->internal) {
1049                         continue;
1050                 }
1051                 if (strequal(domain->name, domainname)) {
1052                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1053                         set_domain_offline(domain);
1054                         /* we are in the trusted domain, set the primary domain
1055                          * offline too */
1056                         if (domain != primary_domain) {
1057                                 set_domain_offline(primary_domain);
1058                         }
1059                 }
1060         }
1061 }
1062
1063 /* Deal with a request to go online. */
1064
1065 static void child_msg_online(struct messaging_context *msg,
1066                              void *private_data,
1067                              uint32_t msg_type,
1068                              struct server_id server_id,
1069                              DATA_BLOB *data)
1070 {
1071         struct winbindd_domain *domain;
1072         struct winbindd_domain *primary_domain = NULL;
1073         const char *domainname = (const char *)data->data;
1074
1075         if (data->data == NULL || data->length == 0) {
1076                 return;
1077         }
1078
1079         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1080
1081         if (!lp_winbind_offline_logon()) {
1082                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1083                 return;
1084         }
1085
1086         primary_domain = find_our_domain();
1087
1088         /* Set our global state as online. */
1089         set_global_winbindd_state_online();
1090
1091         /* Try and mark everything online - delete any negative cache entries
1092            to force a reconnect now. */
1093
1094         for (domain = domain_list(); domain; domain = domain->next) {
1095                 if (domain->internal) {
1096                         continue;
1097                 }
1098                 if (strequal(domain->name, domainname)) {
1099                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1100                         winbindd_flush_negative_conn_cache(domain);
1101                         set_domain_online_request(domain);
1102
1103                         /* we can be in trusted domain, which will contact primary domain
1104                          * we have to bring primary domain online in trusted domain process
1105                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1106                          * --> contact_domain = find_our_domain()
1107                          * */
1108                         if (domain != primary_domain) {
1109                                 winbindd_flush_negative_conn_cache(primary_domain);
1110                                 set_domain_online_request(primary_domain);
1111                         }
1112                 }
1113         }
1114 }
1115
1116 static void child_msg_dump_event_list(struct messaging_context *msg,
1117                                       void *private_data,
1118                                       uint32_t msg_type,
1119                                       struct server_id server_id,
1120                                       DATA_BLOB *data)
1121 {
1122         DEBUG(5,("child_msg_dump_event_list received\n"));
1123
1124         dump_event_list(winbind_event_context());
1125 }
1126
1127 bool winbindd_reinit_after_fork(const char *logfilename)
1128 {
1129         struct winbindd_domain *domain;
1130         struct winbindd_child *cl;
1131         NTSTATUS status;
1132
1133         status = reinit_after_fork(
1134                 winbind_messaging_context(),
1135                 winbind_event_context(),
1136                 messaging_server_id(winbind_messaging_context()),
1137                 true);
1138         if (!NT_STATUS_IS_OK(status)) {
1139                 DEBUG(0,("reinit_after_fork() failed\n"));
1140                 return false;
1141         }
1142
1143         close_conns_after_fork();
1144
1145         if (!override_logfile && logfilename) {
1146                 lp_set_logfile(logfilename);
1147                 reopen_logs();
1148         }
1149
1150         if (!winbindd_setup_sig_term_handler(false))
1151                 return false;
1152         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1153                                             logfilename))
1154                 return false;
1155
1156         /* Stop zombies in children */
1157         CatchChild();
1158
1159         /* Don't handle the same messages as our parent. */
1160         messaging_deregister(winbind_messaging_context(),
1161                              MSG_SMB_CONF_UPDATED, NULL);
1162         messaging_deregister(winbind_messaging_context(),
1163                              MSG_SHUTDOWN, NULL);
1164         messaging_deregister(winbind_messaging_context(),
1165                              MSG_WINBIND_OFFLINE, NULL);
1166         messaging_deregister(winbind_messaging_context(),
1167                              MSG_WINBIND_ONLINE, NULL);
1168         messaging_deregister(winbind_messaging_context(),
1169                              MSG_WINBIND_ONLINESTATUS, NULL);
1170         messaging_deregister(winbind_messaging_context(),
1171                              MSG_DUMP_EVENT_LIST, NULL);
1172         messaging_deregister(winbind_messaging_context(),
1173                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1174         messaging_deregister(winbind_messaging_context(),
1175                              MSG_DEBUG, NULL);
1176
1177         /* We have destroyed all events in the winbindd_event_context
1178          * in reinit_after_fork(), so clean out all possible pending
1179          * event pointers. */
1180
1181         /* Deal with check_online_events. */
1182
1183         for (domain = domain_list(); domain; domain = domain->next) {
1184                 TALLOC_FREE(domain->check_online_event);
1185         }
1186
1187         /* Ensure we're not handling a credential cache event inherited
1188          * from our parent. */
1189
1190         ccache_remove_all_after_fork();
1191
1192         /* Destroy all possible events in child list. */
1193         for (cl = winbindd_children; cl != NULL; cl = cl->next) {
1194                 TALLOC_FREE(cl->lockout_policy_event);
1195                 TALLOC_FREE(cl->machine_password_change_event);
1196
1197                 /* Children should never be able to send
1198                  * each other messages, all messages must
1199                  * go through the parent.
1200                  */
1201                 cl->pid = (pid_t)0;
1202         }
1203         /*
1204          * This is a little tricky, children must not
1205          * send an MSG_WINBIND_ONLINE message to idmap_child().
1206          * If we are in a child of our primary domain or
1207          * in the process created by fork_child_dc_connect(),
1208          * and the primary domain cannot go online,
1209          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1210          * periodically to idmap_child().
1211          *
1212          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1213          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1214          * ---> init_dc_connection() ---> cm_open_connection --->
1215          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1216          * idmap_child(). Disallow children sending messages
1217          * to each other, all messages must go through the parent.
1218          */
1219         cl = idmap_child();
1220         cl->pid = (pid_t)0;
1221
1222         return true;
1223 }
1224
1225 /*
1226  * In a child there will be only one domain, reference that here.
1227  */
1228 static struct winbindd_domain *child_domain;
1229
1230 struct winbindd_domain *wb_child_domain(void)
1231 {
1232         return child_domain;
1233 }
1234
1235 static bool fork_domain_child(struct winbindd_child *child)
1236 {
1237         int fdpair[2];
1238         struct winbindd_cli_state state;
1239         struct winbindd_request request;
1240         struct winbindd_response response;
1241         struct winbindd_domain *primary_domain = NULL;
1242
1243         if (child->domain) {
1244                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1245                            child->domain->name));
1246         } else {
1247                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1248         }
1249
1250         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1251                 DEBUG(0, ("Could not open child pipe: %s\n",
1252                           strerror(errno)));
1253                 return False;
1254         }
1255
1256         ZERO_STRUCT(state);
1257         state.pid = sys_getpid();
1258         state.request = &request;
1259         state.response = &response;
1260
1261         child->pid = sys_fork();
1262
1263         if (child->pid == -1) {
1264                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1265                 return False;
1266         }
1267
1268         if (child->pid != 0) {
1269                 /* Parent */
1270                 close(fdpair[0]);
1271                 child->next = child->prev = NULL;
1272                 DLIST_ADD(winbindd_children, child);
1273                 child->sock = fdpair[1];
1274                 return True;
1275         }
1276
1277         /* Child */
1278         child_domain = child->domain;
1279
1280         DEBUG(10, ("Child process %d\n", (int)sys_getpid()));
1281
1282         state.sock = fdpair[0];
1283         close(fdpair[1]);
1284
1285         if (!winbindd_reinit_after_fork(child->logfilename)) {
1286                 _exit(0);
1287         }
1288
1289         /* Handle online/offline messages. */
1290         messaging_register(winbind_messaging_context(), NULL,
1291                            MSG_WINBIND_OFFLINE, child_msg_offline);
1292         messaging_register(winbind_messaging_context(), NULL,
1293                            MSG_WINBIND_ONLINE, child_msg_online);
1294         messaging_register(winbind_messaging_context(), NULL,
1295                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1296         messaging_register(winbind_messaging_context(), NULL,
1297                            MSG_DEBUG, debug_message);
1298
1299         primary_domain = find_our_domain();
1300
1301         if (primary_domain == NULL) {
1302                 smb_panic("no primary domain found");
1303         }
1304
1305         /* It doesn't matter if we allow cache login,
1306          * try to bring domain online after fork. */
1307         if ( child->domain ) {
1308                 child->domain->startup = True;
1309                 child->domain->startup_time = time(NULL);
1310                 /* we can be in primary domain or in trusted domain
1311                  * If we are in trusted domain, set the primary domain
1312                  * in start-up mode */
1313                 if (!(child->domain->internal)) {
1314                         set_domain_online_request(child->domain);
1315                         if (!(child->domain->primary)) {
1316                                 primary_domain->startup = True;
1317                                 primary_domain->startup_time = time(NULL);
1318                                 set_domain_online_request(primary_domain);
1319                         }
1320                 }
1321         }
1322
1323         /*
1324          * We are in idmap child, make sure that we set the
1325          * check_online_event to bring primary domain online.
1326          */
1327         if (child == idmap_child()) {
1328                 set_domain_online_request(primary_domain);
1329         }
1330
1331         /* We might be in the idmap child...*/
1332         if (child->domain && !(child->domain->internal) &&
1333             lp_winbind_offline_logon()) {
1334
1335                 set_domain_online_request(child->domain);
1336
1337                 if (primary_domain && (primary_domain != child->domain)) {
1338                         /* We need to talk to the primary
1339                          * domain as well as the trusted
1340                          * domain inside a trusted domain
1341                          * child.
1342                          * See the code in :
1343                          * set_dc_type_and_flags_trustinfo()
1344                          * for details.
1345                          */
1346                         set_domain_online_request(primary_domain);
1347                 }
1348
1349                 child->lockout_policy_event = event_add_timed(
1350                         winbind_event_context(), NULL, timeval_zero(),
1351                         account_lockout_policy_handler,
1352                         child);
1353         }
1354
1355         if (child->domain && child->domain->primary &&
1356             !USE_KERBEROS_KEYTAB &&
1357             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1358
1359                 struct timeval next_change;
1360
1361                 if (calculate_next_machine_pwd_change(child->domain->name,
1362                                                        &next_change)) {
1363                         child->machine_password_change_event = event_add_timed(
1364                                 winbind_event_context(), NULL, next_change,
1365                                 machine_password_change_handler,
1366                                 child);
1367                 }
1368         }
1369
1370         while (1) {
1371
1372                 int ret;
1373                 fd_set r_fds;
1374                 fd_set w_fds;
1375                 int maxfd;
1376                 struct timeval t;
1377                 struct timeval *tp;
1378                 struct timeval now;
1379                 TALLOC_CTX *frame = talloc_stackframe();
1380                 struct iovec iov[2];
1381                 int iov_count;
1382                 NTSTATUS status;
1383
1384                 if (run_events(winbind_event_context(), 0, NULL, NULL)) {
1385                         TALLOC_FREE(frame);
1386                         continue;
1387                 }
1388
1389                 GetTimeOfDay(&now);
1390
1391                 if (child->domain && child->domain->startup &&
1392                                 (now.tv_sec > child->domain->startup_time + 30)) {
1393                         /* No longer in "startup" mode. */
1394                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1395                                 child->domain->name ));
1396                         child->domain->startup = False;
1397                 }
1398
1399                 FD_ZERO(&r_fds);
1400                 FD_ZERO(&w_fds);
1401                 FD_SET(state.sock, &r_fds);
1402                 maxfd = state.sock;
1403
1404                 /*
1405                  * Initialize this high as event_add_to_select_args()
1406                  * uses a timeval_min() on this and next_event. Fix
1407                  * from Roel van Meer <rolek@alt001.com>.
1408                  */
1409                 t.tv_sec = 999999;
1410                 t.tv_usec = 0;
1411
1412                 event_add_to_select_args(winbind_event_context(), &now,
1413                                          &r_fds, &w_fds, &t, &maxfd);
1414                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1415                 if (tp) {
1416                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1417                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1418                 }
1419
1420                 ret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, tp);
1421
1422                 if (run_events(winbind_event_context(), ret, &r_fds, &w_fds)) {
1423                         /* We got a signal - continue. */
1424                         TALLOC_FREE(frame);
1425                         continue;
1426                 }
1427
1428                 if (ret == 0) {
1429                         DEBUG(11,("nothing is ready yet, continue\n"));
1430                         TALLOC_FREE(frame);
1431                         continue;
1432                 }
1433
1434                 if (ret == -1 && errno == EINTR) {
1435                         /* We got a signal - continue. */
1436                         TALLOC_FREE(frame);
1437                         continue;
1438                 }
1439
1440                 if (ret == -1 && errno != EINTR) {
1441                         DEBUG(0,("select error occured\n"));
1442                         TALLOC_FREE(frame);
1443                         perror("select");
1444                         _exit(1);
1445                 }
1446
1447                 /* fetch a request from the main daemon */
1448                 status = child_read_request(&state);
1449
1450                 if (!NT_STATUS_IS_OK(status)) {
1451                         /* we lost contact with our parent */
1452                         _exit(0);
1453                 }
1454
1455                 DEBUG(4,("child daemon request %d\n", (int)state.request->cmd));
1456
1457                 ZERO_STRUCTP(state.response);
1458                 state.request->null_term = '\0';
1459                 state.mem_ctx = frame;
1460                 child_process_request(child, &state);
1461
1462                 DEBUG(4, ("Finished processing child request %d\n",
1463                           (int)state.request->cmd));
1464
1465                 SAFE_FREE(state.request->extra_data.data);
1466
1467                 iov[0].iov_base = (void *)state.response;
1468                 iov[0].iov_len = sizeof(struct winbindd_response);
1469                 iov_count = 1;
1470
1471                 if (state.response->length > sizeof(struct winbindd_response)) {
1472                         iov[1].iov_base =
1473                                 (void *)state.response->extra_data.data;
1474                         iov[1].iov_len = state.response->length-iov[0].iov_len;
1475                         iov_count = 2;
1476                 }
1477
1478                 DEBUG(10, ("Writing %d bytes to parent\n",
1479                            (int)state.response->length));
1480
1481                 if (write_data_iov(state.sock, iov, iov_count) !=
1482                     state.response->length) {
1483                         DEBUG(0, ("Could not write result\n"));
1484                         exit(1);
1485                 }
1486                 TALLOC_FREE(frame);
1487         }
1488 }