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 static void child_process_request(struct winbindd_child *child,
 371                                   struct winbindd_cli_state *state)
 372 {
 373         struct winbindd_domain *domain = child->domain;
 374         const struct winbindd_child_dispatch_table *table = child->table;
 375
 376         /* Free response data - we may be interrupted and receive another
 377            command before being able to send this data off. */
 378
 379         state->response->result = WINBINDD_ERROR;
 380         state->response->length = sizeof(struct winbindd_response);
 381
 382         /* as all requests in the child are sync, we can use talloc_tos() */
 383         state->mem_ctx = talloc_tos();
 384
 385         /* Process command */
 386
 387         for (; table->name; table++) {
 388                 if (state->request->cmd == table->struct_cmd) {
 389                         DEBUG(10,("child_process_request: request fn %s\n",
 390                                   table->name));
 391                         state->response->result = table->struct_fn(domain, state);
 392                         return;
 393                 }
 394         }
 395
 396         DEBUG(1 ,("child_process_request: unknown request fn number %d\n",
 397                   (int)state->request->cmd));
 398         state->response->result = WINBINDD_ERROR;
 399 }
 400
 401 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 402                  const struct winbindd_child_dispatch_table *table,
 403                  const char *logprefix,
 404                  const char *logname)
 405 {
 406         if (logprefix && logname) {
 407                 if (asprintf(&child->logfilename, "%s/%s-%s",
 408                              get_dyn_LOGFILEBASE(), logprefix, logname) < 0) {
 409                         smb_panic("Internal error: asprintf failed");
 410                 }
 411         } else {
 412                 smb_panic("Internal error: logprefix == NULL && "
 413                           "logname == NULL");
 414         }
 415
 416         child->domain = domain;
 417         child->table = table;
 418         child->queue = tevent_queue_create(NULL, "winbind_child");
 419         SMB_ASSERT(child->queue != NULL);
 420         child->rpccli = wbint_rpccli_create(NULL, domain, child);
 421         SMB_ASSERT(child->rpccli != NULL);
 422 }
 423
 424 struct winbindd_child *children = NULL;
 425
 426 void winbind_child_died(pid_t pid)
 427 {
 428         struct winbindd_child *child;
 429
 430         for (child = children; child != NULL; child = child->next) {
 431                 if (child->pid == pid) {
 432                         break;
 433                 }
 434         }
 435
 436         if (child == NULL) {
 437                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 438                 return;
 439         }
 440
 441         /* This will be re-added in fork_domain_child() */
 442
 443         DLIST_REMOVE(children, child);
 444
 445         close(child->sock);
 446         child->sock = -1;
 447         child->pid = 0;
 448 }
 449
 450 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 451
 452 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 453 {
 454         flush_negative_conn_cache_for_domain(domain->name);
 455         if (*domain->alt_name) {
 456                 flush_negative_conn_cache_for_domain(domain->alt_name);
 457         }
 458 }
 459
 460 /*
 461  * Parent winbindd process sets its own debug level first and then
 462  * sends a message to all the winbindd children to adjust their debug
 463  * level to that of parents.
 464  */
 465
 466 void winbind_msg_debug(struct messaging_context *msg_ctx,
 467                          void *private_data,
 468                          uint32_t msg_type,
 469                          struct server_id server_id,
 470                          DATA_BLOB *data)
 471 {
 472         struct winbindd_child *child;
 473
 474         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 475
 476         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 477
 478         for (child = children; child != NULL; child = child->next) {
 479
 480                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 481                         (unsigned int)child->pid));
 482
 483                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 484                            MSG_DEBUG,
 485                            data->data,
 486                            strlen((char *) data->data) + 1);
 487         }
 488 }
 489
 490 /* Set our domains as offline and forward the offline message to our children. */
 491
 492 void winbind_msg_offline(struct messaging_context *msg_ctx,
 493                          void *private_data,
 494                          uint32_t msg_type,
 495                          struct server_id server_id,
 496                          DATA_BLOB *data)
 497 {
 498         struct winbindd_child *child;
 499         struct winbindd_domain *domain;
 500
 501         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 502
 503         if (!lp_winbind_offline_logon()) {
 504                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 505                 return;
 506         }
 507
 508         /* Set our global state as offline. */
 509         if (!set_global_winbindd_state_offline()) {
 510                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 511                 return;
 512         }
 513
 514         /* Set all our domains as offline. */
 515         for (domain = domain_list(); domain; domain = domain->next) {
 516                 if (domain->internal) {
 517                         continue;
 518                 }
 519                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 520                 set_domain_offline(domain);
 521         }
 522
 523         for (child = children; child != NULL; child = child->next) {
 524                 /* Don't send message to internal children.  We've already
 525                    done so above. */
 526                 if (!child->domain || winbindd_internal_child(child)) {
 527                         continue;
 528                 }
 529
 530                 /* Or internal domains (this should not be possible....) */
 531                 if (child->domain->internal) {
 532                         continue;
 533                 }
 534
 535                 /* Each winbindd child should only process requests for one domain - make sure
 536                    we only set it online / offline for that domain. */
 537
 538                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 539                         (unsigned int)child->pid, domain->name ));
 540
 541                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 542                                    MSG_WINBIND_OFFLINE,
 543                                    (uint8 *)child->domain->name,
 544                                    strlen(child->domain->name)+1);
 545         }
 546 }
 547
 548 /* Set our domains as online and forward the online message to our children. */
 549
 550 void winbind_msg_online(struct messaging_context *msg_ctx,
 551                         void *private_data,
 552                         uint32_t msg_type,
 553                         struct server_id server_id,
 554                         DATA_BLOB *data)
 555 {
 556         struct winbindd_child *child;
 557         struct winbindd_domain *domain;
 558
 559         DEBUG(10,("winbind_msg_online: got online message.\n"));
 560
 561         if (!lp_winbind_offline_logon()) {
 562                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 563                 return;
 564         }
 565
 566         /* Set our global state as online. */
 567         set_global_winbindd_state_online();
 568
 569         smb_nscd_flush_user_cache();
 570         smb_nscd_flush_group_cache();
 571
 572         /* Set all our domains as online. */
 573         for (domain = domain_list(); domain; domain = domain->next) {
 574                 if (domain->internal) {
 575                         continue;
 576                 }
 577                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 578
 579                 winbindd_flush_negative_conn_cache(domain);
 580                 set_domain_online_request(domain);
 581
 582                 /* Send an online message to the idmap child when our
 583                    primary domain comes back online */
 584
 585                 if ( domain->primary ) {
 586                         struct winbindd_child *idmap = idmap_child();
 587
 588                         if ( idmap->pid != 0 ) {
 589                                 messaging_send_buf(msg_ctx,
 590                                                    pid_to_procid(idmap->pid),
 591                                                    MSG_WINBIND_ONLINE,
 592                                                    (uint8 *)domain->name,
 593                                                    strlen(domain->name)+1);
 594                         }
 595                 }
 596         }
 597
 598         for (child = children; child != NULL; child = child->next) {
 599                 /* Don't send message to internal childs. */
 600                 if (!child->domain || winbindd_internal_child(child)) {
 601                         continue;
 602                 }
 603
 604                 /* Or internal domains (this should not be possible....) */
 605                 if (child->domain->internal) {
 606                         continue;
 607                 }
 608
 609                 /* Each winbindd child should only process requests for one domain - make sure
 610                    we only set it online / offline for that domain. */
 611
 612                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 613                         (unsigned int)child->pid, child->domain->name ));
 614
 615                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 616                                    MSG_WINBIND_ONLINE,
 617                                    (uint8 *)child->domain->name,
 618                                    strlen(child->domain->name)+1);
 619         }
 620 }
 621
 622 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 623 {
 624         struct winbindd_domain *domain;
 625         char *buf = NULL;
 626
 627         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 628                                    get_global_winbindd_state_offline() ?
 629                                    "Offline":"Online")) == NULL) {
 630                 return NULL;
 631         }
 632
 633         for (domain = domain_list(); domain; domain = domain->next) {
 634                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 635                                                   domain->name,
 636                                                   domain->online ?
 637                                                   "Online":"Offline")) == NULL) {
 638                         return NULL;
 639                 }
 640         }
 641
 642         buf = talloc_asprintf_append_buffer(buf, "\n");
 643
 644         DEBUG(5,("collect_onlinestatus: %s", buf));
 645
 646         return buf;
 647 }
 648
 649 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 650                               void *private_data,
 651                               uint32_t msg_type,
 652                               struct server_id server_id,
 653                               DATA_BLOB *data)
 654 {
 655         TALLOC_CTX *mem_ctx;
 656         const char *message;
 657         struct server_id *sender;
 658
 659         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 660
 661         if (!data->data) {
 662                 return;
 663         }
 664
 665         sender = (struct server_id *)data->data;
 666
 667         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 668         if (mem_ctx == NULL) {
 669                 return;
 670         }
 671
 672         message = collect_onlinestatus(mem_ctx);
 673         if (message == NULL) {
 674                 talloc_destroy(mem_ctx);
 675                 return;
 676         }
 677
 678         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 679                            (uint8 *)message, strlen(message) + 1);
 680
 681         talloc_destroy(mem_ctx);
 682 }
 683
 684 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 685                                  void *private_data,
 686                                  uint32_t msg_type,
 687                                  struct server_id server_id,
 688                                  DATA_BLOB *data)
 689 {
 690         struct winbindd_child *child;
 691
 692         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 693
 694         dump_event_list(winbind_event_context());
 695
 696         for (child = children; child != NULL; child = child->next) {
 697
 698                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 699                         (unsigned int)child->pid));
 700
 701                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 702                                    MSG_DUMP_EVENT_LIST,
 703                                    NULL, 0);
 704         }
 705
 706 }
 707
 708 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 709                                   void *private_data,
 710                                   uint32_t msg_type,
 711                                   struct server_id server_id,
 712                                   DATA_BLOB *data)
 713 {
 714         TALLOC_CTX *mem_ctx;
 715         const char *message = NULL;
 716         struct server_id *sender = NULL;
 717         const char *domain = NULL;
 718         char *s = NULL;
 719         NTSTATUS status;
 720         struct winbindd_domain *dom = NULL;
 721
 722         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 723
 724         if (!data || !data->data) {
 725                 return;
 726         }
 727
 728         if (data->length < sizeof(struct server_id)) {
 729                 return;
 730         }
 731
 732         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 733         if (!mem_ctx) {
 734                 return;
 735         }
 736
 737         sender = (struct server_id *)data->data;
 738         if (data->length > sizeof(struct server_id)) {
 739                 domain = (const char *)data->data+sizeof(struct server_id);
 740         }
 741
 742         if (domain) {
 743
 744                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 745                         domain));
 746
 747                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 748                                                   find_domain_from_name_noinit(domain));
 749                 if (!message) {
 750                         talloc_destroy(mem_ctx);
 751                         return;
 752                 }
 753
 754                 messaging_send_buf(msg_ctx, *sender,
 755                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 756                                    (uint8_t *)message, strlen(message) + 1);
 757
 758                 talloc_destroy(mem_ctx);
 759
 760                 return;
 761         }
 762
 763         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 764
 765         for (dom = domain_list(); dom; dom=dom->next) {
 766                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 767                 if (!message) {
 768                         talloc_destroy(mem_ctx);
 769                         return;
 770                 }
 771
 772                 s = talloc_asprintf_append(s, "%s\n", message);
 773                 if (!s) {
 774                         talloc_destroy(mem_ctx);
 775                         return;
 776                 }
 777         }
 778
 779         status = messaging_send_buf(msg_ctx, *sender,
 780                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 781                                     (uint8_t *)s, strlen(s) + 1);
 782         if (!NT_STATUS_IS_OK(status)) {
 783                 DEBUG(0,("failed to send message: %s\n",
 784                 nt_errstr(status)));
 785         }
 786
 787         talloc_destroy(mem_ctx);
 788 }
 789
 790 static void account_lockout_policy_handler(struct event_context *ctx,
 791                                            struct timed_event *te,
 792                                            struct timeval now,
 793                                            void *private_data)
 794 {
 795         struct winbindd_child *child =
 796                 (struct winbindd_child *)private_data;
 797         TALLOC_CTX *mem_ctx = NULL;
 798         struct winbindd_methods *methods;
 799         struct samr_DomInfo12 lockout_policy;
 800         NTSTATUS result;
 801
 802         DEBUG(10,("account_lockout_policy_handler called\n"));
 803
 804         TALLOC_FREE(child->lockout_policy_event);
 805
 806         if ( !winbindd_can_contact_domain( child->domain ) ) {
 807                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 808                           "do not have an incoming trust to domain %s\n",
 809                           child->domain->name));
 810
 811                 return;
 812         }
 813
 814         methods = child->domain->methods;
 815
 816         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 817         if (!mem_ctx) {
 818                 result = NT_STATUS_NO_MEMORY;
 819         } else {
 820                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 821         }
 822         TALLOC_FREE(mem_ctx);
 823
 824         if (!NT_STATUS_IS_OK(result)) {
 825                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 826                          nt_errstr(result)));
 827         }
 828
 829         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 830                                                       timeval_current_ofs(3600, 0),
 831                                                       account_lockout_policy_handler,
 832                                                       child);
 833 }
 834
 835 static time_t get_machine_password_timeout(void)
 836 {
 837         /* until we have gpo support use lp setting */
 838         return lp_machine_password_timeout();
 839 }
 840
 841 static bool calculate_next_machine_pwd_change(const char *domain,
 842                                               struct timeval *t)
 843 {
 844         time_t pass_last_set_time;
 845         time_t timeout;
 846         time_t next_change;
 847         struct timeval tv;
 848         char *pw;
 849
 850         pw = secrets_fetch_machine_password(domain,
 851                                             &pass_last_set_time,
 852                                             NULL);
 853
 854         if (pw == NULL) {
 855                 DEBUG(0,("cannot fetch own machine password ????"));
 856                 return false;
 857         }
 858
 859         SAFE_FREE(pw);
 860
 861         timeout = get_machine_password_timeout();
 862         if (timeout == 0) {
 863                 DEBUG(10,("machine password never expires\n"));
 864                 return false;
 865         }
 866
 867         tv.tv_sec = pass_last_set_time;
 868         DEBUG(10, ("password last changed %s\n",
 869                    timeval_string(talloc_tos(), &tv, false)));
 870         tv.tv_sec += timeout;
 871         DEBUGADD(10, ("password valid until %s\n",
 872                       timeval_string(talloc_tos(), &tv, false)));
 873
 874         if (time(NULL) < (pass_last_set_time + timeout)) {
 875                 next_change = pass_last_set_time + timeout;
 876                 DEBUG(10,("machine password still valid until: %s\n",
 877                         http_timestring(talloc_tos(), next_change)));
 878                 *t = timeval_set(next_change, 0);
 879
 880                 if (lp_clustering()) {
 881                         uint8_t randbuf;
 882                         /*
 883                          * When having a cluster, we have several
 884                          * winbinds racing for the password change. In
 885                          * the machine_password_change_handler()
 886                          * function we check if someone else was
 887                          * faster when the event triggers. We add a
 888                          * 255-second random delay here, so that we
 889                          * don't run to change the password at the
 890                          * exact same moment.
 891                          */
 892                         generate_random_buffer(&randbuf, sizeof(randbuf));
 893                         DEBUG(10, ("adding %d seconds randomness\n",
 894                                    (int)randbuf));
 895                         t->tv_sec += randbuf;
 896                 }
 897                 return true;
 898         }
 899
 900         DEBUG(10,("machine password expired, needs immediate change\n"));
 901
 902         *t = timeval_zero();
 903
 904         return true;
 905 }
 906
 907 static void machine_password_change_handler(struct event_context *ctx,
 908                                             struct timed_event *te,
 909                                             struct timeval now,
 910                                             void *private_data)
 911 {
 912         struct winbindd_child *child =
 913                 (struct winbindd_child *)private_data;
 914         struct rpc_pipe_client *netlogon_pipe = NULL;
 915         TALLOC_CTX *frame;
 916         NTSTATUS result;
 917         struct timeval next_change;
 918
 919         DEBUG(10,("machine_password_change_handler called\n"));
 920
 921         TALLOC_FREE(child->machine_password_change_event);
 922
 923         if (!calculate_next_machine_pwd_change(child->domain->name,
 924                                                &next_change)) {
 925                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
 926                 return;
 927         }
 928
 929         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
 930                    timeval_string(talloc_tos(), &next_change, false)));
 931
 932         if (!timeval_expired(&next_change)) {
 933                 DEBUG(10, ("Someone else has already changed the pw\n"));
 934                 goto done;
 935         }
 936
 937         if (!winbindd_can_contact_domain(child->domain)) {
 938                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
 939                           "do not have an incoming trust to domain %s\n",
 940                           child->domain->name));
 941                 return;
 942         }
 943
 944         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
 945         if (!NT_STATUS_IS_OK(result)) {
 946                 DEBUG(10,("machine_password_change_handler: "
 947                         "failed to connect netlogon pipe: %s\n",
 948                          nt_errstr(result)));
 949                 return;
 950         }
 951
 952         frame = talloc_stackframe();
 953
 954         result = trust_pw_find_change_and_store_it(netlogon_pipe,
 955                                                    frame,
 956                                                    child->domain->name);
 957         TALLOC_FREE(frame);
 958
 959         DEBUG(10, ("machine_password_change_handler: "
 960                    "trust_pw_find_change_and_store_it returned %s\n",
 961                    nt_errstr(result)));
 962
 963         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
 964                 DEBUG(3,("machine_password_change_handler: password set returned "
 965                          "ACCESS_DENIED.  Maybe the trust account "
 966                          "password was changed and we didn't know it. "
 967                          "Killing connections to domain %s\n",
 968                          child->domain->name));
 969                 TALLOC_FREE(child->domain->conn.netlogon_pipe);
 970         }
 971
 972         if (!calculate_next_machine_pwd_change(child->domain->name,
 973                                                &next_change)) {
 974                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
 975                 return;
 976         }
 977
 978         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
 979                    timeval_string(talloc_tos(), &next_change, false)));
 980
 981         if (!NT_STATUS_IS_OK(result)) {
 982                 struct timeval tmp;
 983                 /*
 984                  * In case of failure, give the DC a minute to recover
 985                  */
 986                 tmp = timeval_current_ofs(60, 0);
 987                 next_change = timeval_max(&next_change, &tmp);
 988         }
 989
 990 done:
 991         child->machine_password_change_event = event_add_timed(winbind_event_context(), NULL,
 992                                                               next_change,
 993                                                               machine_password_change_handler,
 994                                                               child);
 995 }
 996
 997 /* Deal with a request to go offline. */
 998
 999 static void child_msg_offline(struct messaging_context *msg,
1000                               void *private_data,
1001                               uint32_t msg_type,
1002                               struct server_id server_id,
1003                               DATA_BLOB *data)
1004 {
1005         struct winbindd_domain *domain;
1006         struct winbindd_domain *primary_domain = NULL;
1007         const char *domainname = (const char *)data->data;
1008
1009         if (data->data == NULL || data->length == 0) {
1010                 return;
1011         }
1012
1013         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1014
1015         if (!lp_winbind_offline_logon()) {
1016                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1017                 return;
1018         }
1019
1020         primary_domain = find_our_domain();
1021
1022         /* Mark the requested domain offline. */
1023
1024         for (domain = domain_list(); domain; domain = domain->next) {
1025                 if (domain->internal) {
1026                         continue;
1027                 }
1028                 if (strequal(domain->name, domainname)) {
1029                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1030                         set_domain_offline(domain);
1031                         /* we are in the trusted domain, set the primary domain
1032                          * offline too */
1033                         if (domain != primary_domain) {
1034                                 set_domain_offline(primary_domain);
1035                         }
1036                 }
1037         }
1038 }
1039
1040 /* Deal with a request to go online. */
1041
1042 static void child_msg_online(struct messaging_context *msg,
1043                              void *private_data,
1044                              uint32_t msg_type,
1045                              struct server_id server_id,
1046                              DATA_BLOB *data)
1047 {
1048         struct winbindd_domain *domain;
1049         struct winbindd_domain *primary_domain = NULL;
1050         const char *domainname = (const char *)data->data;
1051
1052         if (data->data == NULL || data->length == 0) {
1053                 return;
1054         }
1055
1056         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1057
1058         if (!lp_winbind_offline_logon()) {
1059                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1060                 return;
1061         }
1062
1063         primary_domain = find_our_domain();
1064
1065         /* Set our global state as online. */
1066         set_global_winbindd_state_online();
1067
1068         /* Try and mark everything online - delete any negative cache entries
1069            to force a reconnect now. */
1070
1071         for (domain = domain_list(); domain; domain = domain->next) {
1072                 if (domain->internal) {
1073                         continue;
1074                 }
1075                 if (strequal(domain->name, domainname)) {
1076                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1077                         winbindd_flush_negative_conn_cache(domain);
1078                         set_domain_online_request(domain);
1079
1080                         /* we can be in trusted domain, which will contact primary domain
1081                          * we have to bring primary domain online in trusted domain process
1082                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1083                          * --> contact_domain = find_our_domain()
1084                          * */
1085                         if (domain != primary_domain) {
1086                                 winbindd_flush_negative_conn_cache(primary_domain);
1087                                 set_domain_online_request(primary_domain);
1088                         }
1089                 }
1090         }
1091 }
1092
1093 static void child_msg_dump_event_list(struct messaging_context *msg,
1094                                       void *private_data,
1095                                       uint32_t msg_type,
1096                                       struct server_id server_id,
1097                                       DATA_BLOB *data)
1098 {
1099         DEBUG(5,("child_msg_dump_event_list received\n"));
1100
1101         dump_event_list(winbind_event_context());
1102 }
1103
1104 bool winbindd_reinit_after_fork(const char *logfilename)
1105 {
1106         struct winbindd_domain *domain;
1107         struct winbindd_child *cl;
1108
1109         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1110                                                winbind_event_context(),
1111                                                true))) {
1112                 DEBUG(0,("reinit_after_fork() failed\n"));
1113                 return false;
1114         }
1115
1116         close_conns_after_fork();
1117
1118         if (!override_logfile && logfilename) {
1119                 lp_set_logfile(logfilename);
1120                 reopen_logs();
1121         }
1122
1123         if (!winbindd_setup_sig_term_handler(false))
1124                 return false;
1125         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1126                                             logfilename))
1127                 return false;
1128
1129         /* Stop zombies in children */
1130         CatchChild();
1131
1132         /* Don't handle the same messages as our parent. */
1133         messaging_deregister(winbind_messaging_context(),
1134                              MSG_SMB_CONF_UPDATED, NULL);
1135         messaging_deregister(winbind_messaging_context(),
1136                              MSG_SHUTDOWN, NULL);
1137         messaging_deregister(winbind_messaging_context(),
1138                              MSG_WINBIND_OFFLINE, NULL);
1139         messaging_deregister(winbind_messaging_context(),
1140                              MSG_WINBIND_ONLINE, NULL);
1141         messaging_deregister(winbind_messaging_context(),
1142                              MSG_WINBIND_ONLINESTATUS, NULL);
1143         messaging_deregister(winbind_messaging_context(),
1144                              MSG_DUMP_EVENT_LIST, NULL);
1145         messaging_deregister(winbind_messaging_context(),
1146                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1147         messaging_deregister(winbind_messaging_context(),
1148                              MSG_DEBUG, NULL);
1149
1150         /* We have destroyed all events in the winbindd_event_context
1151          * in reinit_after_fork(), so clean out all possible pending
1152          * event pointers. */
1153
1154         /* Deal with check_online_events. */
1155
1156         for (domain = domain_list(); domain; domain = domain->next) {
1157                 TALLOC_FREE(domain->check_online_event);
1158         }
1159
1160         /* Ensure we're not handling a credential cache event inherited
1161          * from our parent. */
1162
1163         ccache_remove_all_after_fork();
1164
1165         /* Destroy all possible events in child list. */
1166         for (cl = children; cl != NULL; cl = cl->next) {
1167                 TALLOC_FREE(cl->lockout_policy_event);
1168                 TALLOC_FREE(cl->machine_password_change_event);
1169
1170                 /* Children should never be able to send
1171                  * each other messages, all messages must
1172                  * go through the parent.
1173                  */
1174                 cl->pid = (pid_t)0;
1175         }
1176         /*
1177          * This is a little tricky, children must not
1178          * send an MSG_WINBIND_ONLINE message to idmap_child().
1179          * If we are in a child of our primary domain or
1180          * in the process created by fork_child_dc_connect(),
1181          * and the primary domain cannot go online,
1182          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1183          * periodically to idmap_child().
1184          *
1185          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1186          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1187          * ---> init_dc_connection() ---> cm_open_connection --->
1188          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1189          * idmap_child(). Disallow children sending messages
1190          * to each other, all messages must go through the parent.
1191          */
1192         cl = idmap_child();
1193         cl->pid = (pid_t)0;
1194
1195         return true;
1196 }
1197
1198 /*
1199  * In a child there will be only one domain, reference that here.
1200  */
1201 static struct winbindd_domain *child_domain;
1202
1203 struct winbindd_domain *wb_child_domain(void)
1204 {
1205         return child_domain;
1206 }
1207
1208 static bool fork_domain_child(struct winbindd_child *child)
1209 {
1210         int fdpair[2];
1211         struct winbindd_cli_state state;
1212         struct winbindd_request request;
1213         struct winbindd_response response;
1214         struct winbindd_domain *primary_domain = NULL;
1215
1216         if (child->domain) {
1217                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1218                            child->domain->name));
1219         } else {
1220                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1221         }
1222
1223         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1224                 DEBUG(0, ("Could not open child pipe: %s\n",
1225                           strerror(errno)));
1226                 return False;
1227         }
1228
1229         ZERO_STRUCT(state);
1230         state.pid = sys_getpid();
1231         state.request = &request;
1232         state.response = &response;
1233
1234         child->pid = sys_fork();
1235
1236         if (child->pid == -1) {
1237                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1238                 return False;
1239         }
1240
1241         if (child->pid != 0) {
1242                 /* Parent */
1243                 close(fdpair[0]);
1244                 child->next = child->prev = NULL;
1245                 DLIST_ADD(children, child);
1246                 child->sock = fdpair[1];
1247                 return True;
1248         }
1249
1250         /* Child */
1251         child_domain = child->domain;
1252
1253         DEBUG(10, ("Child process %d\n", (int)sys_getpid()));
1254
1255         state.sock = fdpair[0];
1256         close(fdpair[1]);
1257
1258         if (!winbindd_reinit_after_fork(child->logfilename)) {
1259                 _exit(0);
1260         }
1261
1262         /* Handle online/offline messages. */
1263         messaging_register(winbind_messaging_context(), NULL,
1264                            MSG_WINBIND_OFFLINE, child_msg_offline);
1265         messaging_register(winbind_messaging_context(), NULL,
1266                            MSG_WINBIND_ONLINE, child_msg_online);
1267         messaging_register(winbind_messaging_context(), NULL,
1268                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1269         messaging_register(winbind_messaging_context(), NULL,
1270                            MSG_DEBUG, debug_message);
1271
1272         primary_domain = find_our_domain();
1273
1274         if (primary_domain == NULL) {
1275                 smb_panic("no primary domain found");
1276         }
1277
1278         /* It doesn't matter if we allow cache login,
1279          * try to bring domain online after fork. */
1280         if ( child->domain ) {
1281                 child->domain->startup = True;
1282                 child->domain->startup_time = time(NULL);
1283                 /* we can be in primary domain or in trusted domain
1284                  * If we are in trusted domain, set the primary domain
1285                  * in start-up mode */
1286                 if (!(child->domain->internal)) {
1287                         set_domain_online_request(child->domain);
1288                         if (!(child->domain->primary)) {
1289                                 primary_domain->startup = True;
1290                                 primary_domain->startup_time = time(NULL);
1291                                 set_domain_online_request(primary_domain);
1292                         }
1293                 }
1294         }
1295
1296         /*
1297          * We are in idmap child, make sure that we set the
1298          * check_online_event to bring primary domain online.
1299          */
1300         if (child == idmap_child()) {
1301                 set_domain_online_request(primary_domain);
1302         }
1303
1304         /* We might be in the idmap child...*/
1305         if (child->domain && !(child->domain->internal) &&
1306             lp_winbind_offline_logon()) {
1307
1308                 set_domain_online_request(child->domain);
1309
1310                 if (primary_domain && (primary_domain != child->domain)) {
1311                         /* We need to talk to the primary
1312                          * domain as well as the trusted
1313                          * domain inside a trusted domain
1314                          * child.
1315                          * See the code in :
1316                          * set_dc_type_and_flags_trustinfo()
1317                          * for details.
1318                          */
1319                         set_domain_online_request(primary_domain);
1320                 }
1321
1322                 child->lockout_policy_event = event_add_timed(
1323                         winbind_event_context(), NULL, timeval_zero(),
1324                         account_lockout_policy_handler,
1325                         child);
1326         }
1327
1328         if (child->domain && child->domain->primary &&
1329             !USE_KERBEROS_KEYTAB &&
1330             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1331
1332                 struct timeval next_change;
1333
1334                 if (calculate_next_machine_pwd_change(child->domain->name,
1335                                                        &next_change)) {
1336                         child->machine_password_change_event = event_add_timed(
1337                                 winbind_event_context(), NULL, next_change,
1338                                 machine_password_change_handler,
1339                                 child);
1340                 }
1341         }
1342
1343         while (1) {
1344
1345                 int ret;
1346                 fd_set r_fds;
1347                 fd_set w_fds;
1348                 int maxfd;
1349                 struct timeval t;
1350                 struct timeval *tp;
1351                 struct timeval now;
1352                 TALLOC_CTX *frame = talloc_stackframe();
1353                 struct iovec iov[2];
1354                 int iov_count;
1355                 NTSTATUS status;
1356
1357                 if (run_events(winbind_event_context(), 0, NULL, NULL)) {
1358                         TALLOC_FREE(frame);
1359                         continue;
1360                 }
1361
1362                 GetTimeOfDay(&now);
1363
1364                 if (child->domain && child->domain->startup &&
1365                                 (now.tv_sec > child->domain->startup_time + 30)) {
1366                         /* No longer in "startup" mode. */
1367                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1368                                 child->domain->name ));
1369                         child->domain->startup = False;
1370                 }
1371
1372                 FD_ZERO(&r_fds);
1373                 FD_ZERO(&w_fds);
1374                 FD_SET(state.sock, &r_fds);
1375                 maxfd = state.sock;
1376
1377                 /*
1378                  * Initialize this high as event_add_to_select_args()
1379                  * uses a timeval_min() on this and next_event. Fix
1380                  * from Roel van Meer <rolek@alt001.com>.
1381                  */
1382                 t.tv_sec = 999999;
1383                 t.tv_usec = 0;
1384
1385                 event_add_to_select_args(winbind_event_context(), &now,
1386                                          &r_fds, &w_fds, &t, &maxfd);
1387                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1388                 if (tp) {
1389                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1390                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1391                 }
1392
1393                 ret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, tp);
1394
1395                 if (run_events(winbind_event_context(), ret, &r_fds, &w_fds)) {
1396                         /* We got a signal - continue. */
1397                         TALLOC_FREE(frame);
1398                         continue;
1399                 }
1400
1401                 if (ret == 0) {
1402                         DEBUG(11,("nothing is ready yet, continue\n"));
1403                         TALLOC_FREE(frame);
1404                         continue;
1405                 }
1406
1407                 if (ret == -1 && errno == EINTR) {
1408                         /* We got a signal - continue. */
1409                         TALLOC_FREE(frame);
1410                         continue;
1411                 }
1412
1413                 if (ret == -1 && errno != EINTR) {
1414                         DEBUG(0,("select error occured\n"));
1415                         TALLOC_FREE(frame);
1416                         perror("select");
1417                         _exit(1);
1418                 }
1419
1420                 /* fetch a request from the main daemon */
1421                 status = child_read_request(&state);
1422
1423                 if (!NT_STATUS_IS_OK(status)) {
1424                         /* we lost contact with our parent */
1425                         _exit(0);
1426                 }
1427
1428                 DEBUG(4,("child daemon request %d\n", (int)state.request->cmd));
1429
1430                 ZERO_STRUCTP(state.response);
1431                 state.request->null_term = '\0';
1432                 state.mem_ctx = frame;
1433                 child_process_request(child, &state);
1434
1435                 DEBUG(4, ("Finished processing child request %d\n",
1436                           (int)state.request->cmd));
1437
1438                 SAFE_FREE(state.request->extra_data.data);
1439
1440                 iov[0].iov_base = (void *)state.response;
1441                 iov[0].iov_len = sizeof(struct winbindd_response);
1442                 iov_count = 1;
1443
1444                 if (state.response->length > sizeof(struct winbindd_response)) {
1445                         iov[1].iov_base =
1446                                 (void *)state.response->extra_data.data;
1447                         iov[1].iov_len = state.response->length-iov[0].iov_len;
1448                         iov_count = 2;
1449                 }
1450
1451                 DEBUG(10, ("Writing %d bytes to parent\n",
1452                            (int)state.response->length));
1453
1454                 if (write_data_iov(state.sock, iov, iov_count) !=
1455                     state.response->length) {
1456                         DEBUG(0, ("Could not write result\n"));
1457                         exit(1);
1458                 }
1459                 TALLOC_FREE(frame);
1460         }
1461 }