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 #include "../lib/util/select.h"
  36 #include "../libcli/security/security.h"
  37
  38 #undef DBGC_CLASS
  39 #define DBGC_CLASS DBGC_WINBIND
  40
  41 extern bool override_logfile;
  42 extern struct winbindd_methods cache_methods;
  43
  44 /* Read some data from a client connection */
  45
  46 static NTSTATUS child_read_request(struct winbindd_cli_state *state)
  47 {
  48         NTSTATUS status;
  49
  50         /* Read data */
  51
  52         status = read_data(state->sock, (char *)state->request,
  53                            sizeof(*state->request));
  54
  55         if (!NT_STATUS_IS_OK(status)) {
  56                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  57                           nt_errstr(status)));
  58                 return status;
  59         }
  60
  61         if (state->request->extra_len == 0) {
  62                 state->request->extra_data.data = NULL;
  63                 return NT_STATUS_OK;
  64         }
  65
  66         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request->extra_len));
  67
  68         state->request->extra_data.data =
  69                 SMB_MALLOC_ARRAY(char, state->request->extra_len + 1);
  70
  71         if (state->request->extra_data.data == NULL) {
  72                 DEBUG(0, ("malloc failed\n"));
  73                 return NT_STATUS_NO_MEMORY;
  74         }
  75
  76         /* Ensure null termination */
  77         state->request->extra_data.data[state->request->extra_len] = '\0';
  78
  79         status= read_data(state->sock, state->request->extra_data.data,
  80                           state->request->extra_len);
  81
  82         if (!NT_STATUS_IS_OK(status)) {
  83                 DEBUG(0, ("Could not read extra data: %s\n",
  84                           nt_errstr(status)));
  85         }
  86         return status;
  87 }
  88
  89 /*
  90  * Do winbind child async request. This is not simply wb_simple_trans. We have
  91  * to do the queueing ourselves because while a request is queued, the child
  92  * might have crashed, and we have to re-fork it in the _trigger function.
  93  */
  94
  95 struct wb_child_request_state {
  96         struct tevent_context *ev;
  97         struct winbindd_child *child;
  98         struct winbindd_request *request;
  99         struct winbindd_response *response;
 100 };
 101
 102 static bool fork_domain_child(struct winbindd_child *child);
 103
 104 static void wb_child_request_trigger(struct tevent_req *req,
 105                                             void *private_data);
 106 static void wb_child_request_done(struct tevent_req *subreq);
 107
 108 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
 109                                          struct tevent_context *ev,
 110                                          struct winbindd_child *child,
 111                                          struct winbindd_request *request)
 112 {
 113         struct tevent_req *req;
 114         struct wb_child_request_state *state;
 115
 116         req = tevent_req_create(mem_ctx, &state,
 117                                 struct wb_child_request_state);
 118         if (req == NULL) {
 119                 return NULL;
 120         }
 121
 122         state->ev = ev;
 123         state->child = child;
 124         state->request = request;
 125
 126         if (!tevent_queue_add(child->queue, ev, req,
 127                               wb_child_request_trigger, NULL)) {
 128                 tevent_req_nomem(NULL, req);
 129                 return tevent_req_post(req, ev);
 130         }
 131         return req;
 132 }
 133
 134 static void wb_child_request_trigger(struct tevent_req *req,
 135                                      void *private_data)
 136 {
 137         struct wb_child_request_state *state = tevent_req_data(
 138                 req, struct wb_child_request_state);
 139         struct tevent_req *subreq;
 140
 141         if ((state->child->pid == 0) && (!fork_domain_child(state->child))) {
 142                 tevent_req_error(req, errno);
 143                 return;
 144         }
 145
 146         subreq = wb_simple_trans_send(state, winbind_event_context(), NULL,
 147                                       state->child->sock, state->request);
 148         if (tevent_req_nomem(subreq, req)) {
 149                 return;
 150         }
 151         tevent_req_set_callback(subreq, wb_child_request_done, req);
 152
 153         if (!tevent_req_set_endtime(req, state->ev,
 154                                     timeval_current_ofs(300, 0))) {
 155                 tevent_req_nomem(NULL, req);
 156                 return;
 157         }
 158 }
 159
 160 static void wb_child_request_done(struct tevent_req *subreq)
 161 {
 162         struct tevent_req *req = tevent_req_callback_data(
 163                 subreq, struct tevent_req);
 164         struct wb_child_request_state *state = tevent_req_data(
 165                 req, struct wb_child_request_state);
 166         int ret, err;
 167
 168         ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
 169         TALLOC_FREE(subreq);
 170         if (ret == -1) {
 171                 tevent_req_error(req, err);
 172                 return;
 173         }
 174         tevent_req_done(req);
 175 }
 176
 177 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 178                           struct winbindd_response **presponse, int *err)
 179 {
 180         struct wb_child_request_state *state = tevent_req_data(
 181                 req, struct wb_child_request_state);
 182
 183         if (tevent_req_is_unix_error(req, err)) {
 184                 return -1;
 185         }
 186         *presponse = talloc_move(mem_ctx, &state->response);
 187         return 0;
 188 }
 189
 190 struct wb_domain_request_state {
 191         struct tevent_context *ev;
 192         struct winbindd_domain *domain;
 193         struct winbindd_request *request;
 194         struct winbindd_request *init_req;
 195         struct winbindd_response *response;
 196 };
 197
 198 static void wb_domain_request_gotdc(struct tevent_req *subreq);
 199 static void wb_domain_request_initialized(struct tevent_req *subreq);
 200 static void wb_domain_request_done(struct tevent_req *subreq);
 201
 202 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
 203                                           struct tevent_context *ev,
 204                                           struct winbindd_domain *domain,
 205                                           struct winbindd_request *request)
 206 {
 207         struct tevent_req *req, *subreq;
 208         struct wb_domain_request_state *state;
 209
 210         req = tevent_req_create(mem_ctx, &state,
 211                                 struct wb_domain_request_state);
 212         if (req == NULL) {
 213                 return NULL;
 214         }
 215
 216         if (domain->initialized) {
 217                 subreq = wb_child_request_send(state, ev, &domain->child,
 218                                                request);
 219                 if (tevent_req_nomem(subreq, req)) {
 220                         return tevent_req_post(req, ev);
 221                 }
 222                 tevent_req_set_callback(subreq, wb_domain_request_done, req);
 223                 return req;
 224         }
 225
 226         state->domain = domain;
 227         state->ev = ev;
 228         state->request = request;
 229
 230         state->init_req = talloc_zero(state, struct winbindd_request);
 231         if (tevent_req_nomem(state->init_req, req)) {
 232                 return tevent_req_post(req, ev);
 233         }
 234
 235         if (IS_DC || domain->primary || domain->internal) {
 236                 /* The primary domain has to find the DC name itself */
 237                 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 238                 fstrcpy(state->init_req->domain_name, domain->name);
 239                 state->init_req->data.init_conn.is_primary =
 240                         domain->primary ? true : false;
 241                 fstrcpy(state->init_req->data.init_conn.dcname, "");
 242
 243                 subreq = wb_child_request_send(state, ev, &domain->child,
 244                                                state->init_req);
 245                 if (tevent_req_nomem(subreq, req)) {
 246                         return tevent_req_post(req, ev);
 247                 }
 248                 tevent_req_set_callback(subreq, wb_domain_request_initialized,
 249                                         req);
 250                 return req;
 251         }
 252
 253         /*
 254          * Ask our DC for a DC name
 255          */
 256         domain = find_our_domain();
 257
 258         /* This is *not* the primary domain, let's ask our DC about a DC
 259          * name */
 260
 261         state->init_req->cmd = WINBINDD_GETDCNAME;
 262         fstrcpy(state->init_req->domain_name, domain->name);
 263
 264         subreq = wb_child_request_send(state, ev, &domain->child, request);
 265         if (tevent_req_nomem(subreq, req)) {
 266                 return tevent_req_post(req, ev);
 267         }
 268         tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
 269         return req;
 270 }
 271
 272 static void wb_domain_request_gotdc(struct tevent_req *subreq)
 273 {
 274         struct tevent_req *req = tevent_req_callback_data(
 275                 subreq, struct tevent_req);
 276         struct wb_domain_request_state *state = tevent_req_data(
 277                 req, struct wb_domain_request_state);
 278         struct winbindd_response *response;
 279         int ret, err;
 280
 281         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 282         TALLOC_FREE(subreq);
 283         if (ret == -1) {
 284                 tevent_req_error(req, err);
 285                 return;
 286         }
 287         state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 288         fstrcpy(state->init_req->domain_name, state->domain->name);
 289         state->init_req->data.init_conn.is_primary = False;
 290         fstrcpy(state->init_req->data.init_conn.dcname,
 291                 response->data.dc_name);
 292
 293         TALLOC_FREE(response);
 294
 295         subreq = wb_child_request_send(state, state->ev, &state->domain->child,
 296                                        state->init_req);
 297         if (tevent_req_nomem(subreq, req)) {
 298                 return;
 299         }
 300         tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
 301 }
 302
 303 static void wb_domain_request_initialized(struct tevent_req *subreq)
 304 {
 305         struct tevent_req *req = tevent_req_callback_data(
 306                 subreq, struct tevent_req);
 307         struct wb_domain_request_state *state = tevent_req_data(
 308                 req, struct wb_domain_request_state);
 309         struct winbindd_response *response;
 310         int ret, err;
 311
 312         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 313         TALLOC_FREE(subreq);
 314         if (ret == -1) {
 315                 tevent_req_error(req, err);
 316                 return;
 317         }
 318
 319         if (!string_to_sid(&state->domain->sid,
 320                            response->data.domain_info.sid)) {
 321                 DEBUG(1,("init_child_recv: Could not convert sid %s "
 322                         "from string\n", response->data.domain_info.sid));
 323                 tevent_req_error(req, EINVAL);
 324                 return;
 325         }
 326         fstrcpy(state->domain->name, response->data.domain_info.name);
 327         fstrcpy(state->domain->alt_name, response->data.domain_info.alt_name);
 328         state->domain->native_mode = response->data.domain_info.native_mode;
 329         state->domain->active_directory =
 330                 response->data.domain_info.active_directory;
 331         state->domain->initialized = true;
 332
 333         TALLOC_FREE(response);
 334
 335         subreq = wb_child_request_send(state, state->ev, &state->domain->child,
 336                                        state->request);
 337         if (tevent_req_nomem(subreq, req)) {
 338                 return;
 339         }
 340         tevent_req_set_callback(subreq, wb_domain_request_done, req);
 341 }
 342
 343 static void wb_domain_request_done(struct tevent_req *subreq)
 344 {
 345         struct tevent_req *req = tevent_req_callback_data(
 346                 subreq, struct tevent_req);
 347         struct wb_domain_request_state *state = tevent_req_data(
 348                 req, struct wb_domain_request_state);
 349         int ret, err;
 350
 351         ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
 352                                     &err);
 353         TALLOC_FREE(subreq);
 354         if (ret == -1) {
 355                 tevent_req_error(req, err);
 356                 return;
 357         }
 358         tevent_req_done(req);
 359 }
 360
 361 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 362                            struct winbindd_response **presponse, int *err)
 363 {
 364         struct wb_domain_request_state *state = tevent_req_data(
 365                 req, struct wb_domain_request_state);
 366
 367         if (tevent_req_is_unix_error(req, err)) {
 368                 return -1;
 369         }
 370         *presponse = talloc_move(mem_ctx, &state->response);
 371         return 0;
 372 }
 373
 374 static void child_process_request(struct winbindd_child *child,
 375                                   struct winbindd_cli_state *state)
 376 {
 377         struct winbindd_domain *domain = child->domain;
 378         const struct winbindd_child_dispatch_table *table = child->table;
 379
 380         /* Free response data - we may be interrupted and receive another
 381            command before being able to send this data off. */
 382
 383         state->response->result = WINBINDD_ERROR;
 384         state->response->length = sizeof(struct winbindd_response);
 385
 386         /* as all requests in the child are sync, we can use talloc_tos() */
 387         state->mem_ctx = talloc_tos();
 388
 389         /* Process command */
 390
 391         for (; table->name; table++) {
 392                 if (state->request->cmd == table->struct_cmd) {
 393                         DEBUG(10,("child_process_request: request fn %s\n",
 394                                   table->name));
 395                         state->response->result = table->struct_fn(domain, state);
 396                         return;
 397                 }
 398         }
 399
 400         DEBUG(1 ,("child_process_request: unknown request fn number %d\n",
 401                   (int)state->request->cmd));
 402         state->response->result = WINBINDD_ERROR;
 403 }
 404
 405 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 406                  const struct winbindd_child_dispatch_table *table,
 407                  const char *logprefix,
 408                  const char *logname)
 409 {
 410         if (logprefix && logname) {
 411                 char *logbase = NULL;
 412
 413                 if (*lp_logfile()) {
 414                         char *end = NULL;
 415
 416                         if (asprintf(&logbase, "%s", lp_logfile()) < 0) {
 417                                 smb_panic("Internal error: asprintf failed");
 418                         }
 419
 420                         if ((end = strrchr_m(logbase, '/'))) {
 421                                 *end = '\0';
 422                         }
 423                 } else {
 424                         if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
 425                                 smb_panic("Internal error: asprintf failed");
 426                         }
 427                 }
 428
 429                 if (asprintf(&child->logfilename, "%s/%s-%s",
 430                              logbase, logprefix, logname) < 0) {
 431                         SAFE_FREE(logbase);
 432                         smb_panic("Internal error: asprintf failed");
 433                 }
 434
 435                 SAFE_FREE(logbase);
 436         } else {
 437                 smb_panic("Internal error: logprefix == NULL && "
 438                           "logname == NULL");
 439         }
 440
 441         child->domain = domain;
 442         child->table = table;
 443         child->queue = tevent_queue_create(NULL, "winbind_child");
 444         SMB_ASSERT(child->queue != NULL);
 445         child->binding_handle = wbint_binding_handle(NULL, domain, child);
 446         SMB_ASSERT(child->binding_handle != NULL);
 447 }
 448
 449 static struct winbindd_child *winbindd_children = NULL;
 450
 451 void winbind_child_died(pid_t pid)
 452 {
 453         struct winbindd_child *child;
 454
 455         for (child = winbindd_children; child != NULL; child = child->next) {
 456                 if (child->pid == pid) {
 457                         break;
 458                 }
 459         }
 460
 461         if (child == NULL) {
 462                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 463                 return;
 464         }
 465
 466         /* This will be re-added in fork_domain_child() */
 467
 468         DLIST_REMOVE(winbindd_children, child);
 469
 470         close(child->sock);
 471         child->sock = -1;
 472         child->pid = 0;
 473 }
 474
 475 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 476
 477 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 478 {
 479         flush_negative_conn_cache_for_domain(domain->name);
 480         if (*domain->alt_name) {
 481                 flush_negative_conn_cache_for_domain(domain->alt_name);
 482         }
 483 }
 484
 485 /*
 486  * Parent winbindd process sets its own debug level first and then
 487  * sends a message to all the winbindd children to adjust their debug
 488  * level to that of parents.
 489  */
 490
 491 void winbind_msg_debug(struct messaging_context *msg_ctx,
 492                          void *private_data,
 493                          uint32_t msg_type,
 494                          struct server_id server_id,
 495                          DATA_BLOB *data)
 496 {
 497         struct winbindd_child *child;
 498
 499         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 500
 501         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 502
 503         for (child = winbindd_children; child != NULL; child = child->next) {
 504
 505                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 506                         (unsigned int)child->pid));
 507
 508                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 509                            MSG_DEBUG,
 510                            data->data,
 511                            strlen((char *) data->data) + 1);
 512         }
 513 }
 514
 515 /* Set our domains as offline and forward the offline message to our children. */
 516
 517 void winbind_msg_offline(struct messaging_context *msg_ctx,
 518                          void *private_data,
 519                          uint32_t msg_type,
 520                          struct server_id server_id,
 521                          DATA_BLOB *data)
 522 {
 523         struct winbindd_child *child;
 524         struct winbindd_domain *domain;
 525
 526         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 527
 528         if (!lp_winbind_offline_logon()) {
 529                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 530                 return;
 531         }
 532
 533         /* Set our global state as offline. */
 534         if (!set_global_winbindd_state_offline()) {
 535                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 536                 return;
 537         }
 538
 539         /* Set all our domains as offline. */
 540         for (domain = domain_list(); domain; domain = domain->next) {
 541                 if (domain->internal) {
 542                         continue;
 543                 }
 544                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 545                 set_domain_offline(domain);
 546         }
 547
 548         for (child = winbindd_children; child != NULL; child = child->next) {
 549                 /* Don't send message to internal children.  We've already
 550                    done so above. */
 551                 if (!child->domain || winbindd_internal_child(child)) {
 552                         continue;
 553                 }
 554
 555                 /* Or internal domains (this should not be possible....) */
 556                 if (child->domain->internal) {
 557                         continue;
 558                 }
 559
 560                 /* Each winbindd child should only process requests for one domain - make sure
 561                    we only set it online / offline for that domain. */
 562
 563                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 564                         (unsigned int)child->pid, domain->name ));
 565
 566                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 567                                    MSG_WINBIND_OFFLINE,
 568                                    (uint8 *)child->domain->name,
 569                                    strlen(child->domain->name)+1);
 570         }
 571 }
 572
 573 /* Set our domains as online and forward the online message to our children. */
 574
 575 void winbind_msg_online(struct messaging_context *msg_ctx,
 576                         void *private_data,
 577                         uint32_t msg_type,
 578                         struct server_id server_id,
 579                         DATA_BLOB *data)
 580 {
 581         struct winbindd_child *child;
 582         struct winbindd_domain *domain;
 583
 584         DEBUG(10,("winbind_msg_online: got online message.\n"));
 585
 586         if (!lp_winbind_offline_logon()) {
 587                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 588                 return;
 589         }
 590
 591         /* Set our global state as online. */
 592         set_global_winbindd_state_online();
 593
 594         smb_nscd_flush_user_cache();
 595         smb_nscd_flush_group_cache();
 596
 597         /* Set all our domains as online. */
 598         for (domain = domain_list(); domain; domain = domain->next) {
 599                 if (domain->internal) {
 600                         continue;
 601                 }
 602                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 603
 604                 winbindd_flush_negative_conn_cache(domain);
 605                 set_domain_online_request(domain);
 606
 607                 /* Send an online message to the idmap child when our
 608                    primary domain comes back online */
 609
 610                 if ( domain->primary ) {
 611                         struct winbindd_child *idmap = idmap_child();
 612
 613                         if ( idmap->pid != 0 ) {
 614                                 messaging_send_buf(msg_ctx,
 615                                                    pid_to_procid(idmap->pid),
 616                                                    MSG_WINBIND_ONLINE,
 617                                                    (uint8 *)domain->name,
 618                                                    strlen(domain->name)+1);
 619                         }
 620                 }
 621         }
 622
 623         for (child = winbindd_children; child != NULL; child = child->next) {
 624                 /* Don't send message to internal childs. */
 625                 if (!child->domain || winbindd_internal_child(child)) {
 626                         continue;
 627                 }
 628
 629                 /* Or internal domains (this should not be possible....) */
 630                 if (child->domain->internal) {
 631                         continue;
 632                 }
 633
 634                 /* Each winbindd child should only process requests for one domain - make sure
 635                    we only set it online / offline for that domain. */
 636
 637                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 638                         (unsigned int)child->pid, child->domain->name ));
 639
 640                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 641                                    MSG_WINBIND_ONLINE,
 642                                    (uint8 *)child->domain->name,
 643                                    strlen(child->domain->name)+1);
 644         }
 645 }
 646
 647 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 648 {
 649         struct winbindd_domain *domain;
 650         char *buf = NULL;
 651
 652         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 653                                    get_global_winbindd_state_offline() ?
 654                                    "Offline":"Online")) == NULL) {
 655                 return NULL;
 656         }
 657
 658         for (domain = domain_list(); domain; domain = domain->next) {
 659                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 660                                                   domain->name,
 661                                                   domain->online ?
 662                                                   "Online":"Offline")) == NULL) {
 663                         return NULL;
 664                 }
 665         }
 666
 667         buf = talloc_asprintf_append_buffer(buf, "\n");
 668
 669         DEBUG(5,("collect_onlinestatus: %s", buf));
 670
 671         return buf;
 672 }
 673
 674 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 675                               void *private_data,
 676                               uint32_t msg_type,
 677                               struct server_id server_id,
 678                               DATA_BLOB *data)
 679 {
 680         TALLOC_CTX *mem_ctx;
 681         const char *message;
 682         struct server_id *sender;
 683
 684         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 685
 686         if (!data->data) {
 687                 return;
 688         }
 689
 690         sender = (struct server_id *)data->data;
 691
 692         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 693         if (mem_ctx == NULL) {
 694                 return;
 695         }
 696
 697         message = collect_onlinestatus(mem_ctx);
 698         if (message == NULL) {
 699                 talloc_destroy(mem_ctx);
 700                 return;
 701         }
 702
 703         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 704                            (uint8 *)message, strlen(message) + 1);
 705
 706         talloc_destroy(mem_ctx);
 707 }
 708
 709 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 710                                  void *private_data,
 711                                  uint32_t msg_type,
 712                                  struct server_id server_id,
 713                                  DATA_BLOB *data)
 714 {
 715         struct winbindd_child *child;
 716
 717         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 718
 719         dump_event_list(winbind_event_context());
 720
 721         for (child = winbindd_children; child != NULL; child = child->next) {
 722
 723                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 724                         (unsigned int)child->pid));
 725
 726                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 727                                    MSG_DUMP_EVENT_LIST,
 728                                    NULL, 0);
 729         }
 730
 731 }
 732
 733 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 734                                   void *private_data,
 735                                   uint32_t msg_type,
 736                                   struct server_id server_id,
 737                                   DATA_BLOB *data)
 738 {
 739         TALLOC_CTX *mem_ctx;
 740         const char *message = NULL;
 741         struct server_id *sender = NULL;
 742         const char *domain = NULL;
 743         char *s = NULL;
 744         NTSTATUS status;
 745         struct winbindd_domain *dom = NULL;
 746
 747         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 748
 749         if (!data || !data->data) {
 750                 return;
 751         }
 752
 753         if (data->length < sizeof(struct server_id)) {
 754                 return;
 755         }
 756
 757         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 758         if (!mem_ctx) {
 759                 return;
 760         }
 761
 762         sender = (struct server_id *)data->data;
 763         if (data->length > sizeof(struct server_id)) {
 764                 domain = (const char *)data->data+sizeof(struct server_id);
 765         }
 766
 767         if (domain) {
 768
 769                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 770                         domain));
 771
 772                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 773                                                   find_domain_from_name_noinit(domain));
 774                 if (!message) {
 775                         talloc_destroy(mem_ctx);
 776                         return;
 777                 }
 778
 779                 messaging_send_buf(msg_ctx, *sender,
 780                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 781                                    (uint8_t *)message, strlen(message) + 1);
 782
 783                 talloc_destroy(mem_ctx);
 784
 785                 return;
 786         }
 787
 788         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 789
 790         for (dom = domain_list(); dom; dom=dom->next) {
 791                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 792                 if (!message) {
 793                         talloc_destroy(mem_ctx);
 794                         return;
 795                 }
 796
 797                 s = talloc_asprintf_append(s, "%s\n", message);
 798                 if (!s) {
 799                         talloc_destroy(mem_ctx);
 800                         return;
 801                 }
 802         }
 803
 804         status = messaging_send_buf(msg_ctx, *sender,
 805                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 806                                     (uint8_t *)s, strlen(s) + 1);
 807         if (!NT_STATUS_IS_OK(status)) {
 808                 DEBUG(0,("failed to send message: %s\n",
 809                 nt_errstr(status)));
 810         }
 811
 812         talloc_destroy(mem_ctx);
 813 }
 814
 815 static void account_lockout_policy_handler(struct event_context *ctx,
 816                                            struct timed_event *te,
 817                                            struct timeval now,
 818                                            void *private_data)
 819 {
 820         struct winbindd_child *child =
 821                 (struct winbindd_child *)private_data;
 822         TALLOC_CTX *mem_ctx = NULL;
 823         struct winbindd_methods *methods;
 824         struct samr_DomInfo12 lockout_policy;
 825         NTSTATUS result;
 826
 827         DEBUG(10,("account_lockout_policy_handler called\n"));
 828
 829         TALLOC_FREE(child->lockout_policy_event);
 830
 831         if ( !winbindd_can_contact_domain( child->domain ) ) {
 832                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 833                           "do not have an incoming trust to domain %s\n",
 834                           child->domain->name));
 835
 836                 return;
 837         }
 838
 839         methods = child->domain->methods;
 840
 841         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 842         if (!mem_ctx) {
 843                 result = NT_STATUS_NO_MEMORY;
 844         } else {
 845                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 846         }
 847         TALLOC_FREE(mem_ctx);
 848
 849         if (!NT_STATUS_IS_OK(result)) {
 850                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 851                          nt_errstr(result)));
 852         }
 853
 854         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 855                                                       timeval_current_ofs(3600, 0),
 856                                                       account_lockout_policy_handler,
 857                                                       child);
 858 }
 859
 860 static time_t get_machine_password_timeout(void)
 861 {
 862         /* until we have gpo support use lp setting */
 863         return lp_machine_password_timeout();
 864 }
 865
 866 static bool calculate_next_machine_pwd_change(const char *domain,
 867                                               struct timeval *t)
 868 {
 869         time_t pass_last_set_time;
 870         time_t timeout;
 871         time_t next_change;
 872         struct timeval tv;
 873         char *pw;
 874
 875         pw = secrets_fetch_machine_password(domain,
 876                                             &pass_last_set_time,
 877                                             NULL);
 878
 879         if (pw == NULL) {
 880                 DEBUG(0,("cannot fetch own machine password ????"));
 881                 return false;
 882         }
 883
 884         SAFE_FREE(pw);
 885
 886         timeout = get_machine_password_timeout();
 887         if (timeout == 0) {
 888                 DEBUG(10,("machine password never expires\n"));
 889                 return false;
 890         }
 891
 892         tv.tv_sec = pass_last_set_time;
 893         DEBUG(10, ("password last changed %s\n",
 894                    timeval_string(talloc_tos(), &tv, false)));
 895         tv.tv_sec += timeout;
 896         DEBUGADD(10, ("password valid until %s\n",
 897                       timeval_string(talloc_tos(), &tv, false)));
 898
 899         if (time(NULL) < (pass_last_set_time + timeout)) {
 900                 next_change = pass_last_set_time + timeout;
 901                 DEBUG(10,("machine password still valid until: %s\n",
 902                         http_timestring(talloc_tos(), next_change)));
 903                 *t = timeval_set(next_change, 0);
 904
 905                 if (lp_clustering()) {
 906                         uint8_t randbuf;
 907                         /*
 908                          * When having a cluster, we have several
 909                          * winbinds racing for the password change. In
 910                          * the machine_password_change_handler()
 911                          * function we check if someone else was
 912                          * faster when the event triggers. We add a
 913                          * 255-second random delay here, so that we
 914                          * don't run to change the password at the
 915                          * exact same moment.
 916                          */
 917                         generate_random_buffer(&randbuf, sizeof(randbuf));
 918                         DEBUG(10, ("adding %d seconds randomness\n",
 919                                    (int)randbuf));
 920                         t->tv_sec += randbuf;
 921                 }
 922                 return true;
 923         }
 924
 925         DEBUG(10,("machine password expired, needs immediate change\n"));
 926
 927         *t = timeval_zero();
 928
 929         return true;
 930 }
 931
 932 static void machine_password_change_handler(struct event_context *ctx,
 933                                             struct timed_event *te,
 934                                             struct timeval now,
 935                                             void *private_data)
 936 {
 937         struct winbindd_child *child =
 938                 (struct winbindd_child *)private_data;
 939         struct rpc_pipe_client *netlogon_pipe = NULL;
 940         TALLOC_CTX *frame;
 941         NTSTATUS result;
 942         struct timeval next_change;
 943
 944         DEBUG(10,("machine_password_change_handler called\n"));
 945
 946         TALLOC_FREE(child->machine_password_change_event);
 947
 948         if (!calculate_next_machine_pwd_change(child->domain->name,
 949                                                &next_change)) {
 950                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
 951                 return;
 952         }
 953
 954         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
 955                    timeval_string(talloc_tos(), &next_change, false)));
 956
 957         if (!timeval_expired(&next_change)) {
 958                 DEBUG(10, ("Someone else has already changed the pw\n"));
 959                 goto done;
 960         }
 961
 962         if (!winbindd_can_contact_domain(child->domain)) {
 963                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
 964                           "do not have an incoming trust to domain %s\n",
 965                           child->domain->name));
 966                 return;
 967         }
 968
 969         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
 970         if (!NT_STATUS_IS_OK(result)) {
 971                 DEBUG(10,("machine_password_change_handler: "
 972                         "failed to connect netlogon pipe: %s\n",
 973                          nt_errstr(result)));
 974                 return;
 975         }
 976
 977         frame = talloc_stackframe();
 978
 979         result = trust_pw_find_change_and_store_it(netlogon_pipe,
 980                                                    frame,
 981                                                    child->domain->name);
 982         TALLOC_FREE(frame);
 983
 984         DEBUG(10, ("machine_password_change_handler: "
 985                    "trust_pw_find_change_and_store_it returned %s\n",
 986                    nt_errstr(result)));
 987
 988         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
 989                 DEBUG(3,("machine_password_change_handler: password set returned "
 990                          "ACCESS_DENIED.  Maybe the trust account "
 991                          "password was changed and we didn't know it. "
 992                          "Killing connections to domain %s\n",
 993                          child->domain->name));
 994                 TALLOC_FREE(child->domain->conn.netlogon_pipe);
 995         }
 996
 997         if (!calculate_next_machine_pwd_change(child->domain->name,
 998                                                &next_change)) {
 999                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1000                 return;
1001         }
1002
1003         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1004                    timeval_string(talloc_tos(), &next_change, false)));
1005
1006         if (!NT_STATUS_IS_OK(result)) {
1007                 struct timeval tmp;
1008                 /*
1009                  * In case of failure, give the DC a minute to recover
1010                  */
1011                 tmp = timeval_current_ofs(60, 0);
1012                 next_change = timeval_max(&next_change, &tmp);
1013         }
1014
1015 done:
1016         child->machine_password_change_event = event_add_timed(winbind_event_context(), NULL,
1017                                                               next_change,
1018                                                               machine_password_change_handler,
1019                                                               child);
1020 }
1021
1022 /* Deal with a request to go offline. */
1023
1024 static void child_msg_offline(struct messaging_context *msg,
1025                               void *private_data,
1026                               uint32_t msg_type,
1027                               struct server_id server_id,
1028                               DATA_BLOB *data)
1029 {
1030         struct winbindd_domain *domain;
1031         struct winbindd_domain *primary_domain = NULL;
1032         const char *domainname = (const char *)data->data;
1033
1034         if (data->data == NULL || data->length == 0) {
1035                 return;
1036         }
1037
1038         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1039
1040         if (!lp_winbind_offline_logon()) {
1041                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1042                 return;
1043         }
1044
1045         primary_domain = find_our_domain();
1046
1047         /* Mark the requested domain offline. */
1048
1049         for (domain = domain_list(); domain; domain = domain->next) {
1050                 if (domain->internal) {
1051                         continue;
1052                 }
1053                 if (strequal(domain->name, domainname)) {
1054                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1055                         set_domain_offline(domain);
1056                         /* we are in the trusted domain, set the primary domain
1057                          * offline too */
1058                         if (domain != primary_domain) {
1059                                 set_domain_offline(primary_domain);
1060                         }
1061                 }
1062         }
1063 }
1064
1065 /* Deal with a request to go online. */
1066
1067 static void child_msg_online(struct messaging_context *msg,
1068                              void *private_data,
1069                              uint32_t msg_type,
1070                              struct server_id server_id,
1071                              DATA_BLOB *data)
1072 {
1073         struct winbindd_domain *domain;
1074         struct winbindd_domain *primary_domain = NULL;
1075         const char *domainname = (const char *)data->data;
1076
1077         if (data->data == NULL || data->length == 0) {
1078                 return;
1079         }
1080
1081         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1082
1083         if (!lp_winbind_offline_logon()) {
1084                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1085                 return;
1086         }
1087
1088         primary_domain = find_our_domain();
1089
1090         /* Set our global state as online. */
1091         set_global_winbindd_state_online();
1092
1093         /* Try and mark everything online - delete any negative cache entries
1094            to force a reconnect now. */
1095
1096         for (domain = domain_list(); domain; domain = domain->next) {
1097                 if (domain->internal) {
1098                         continue;
1099                 }
1100                 if (strequal(domain->name, domainname)) {
1101                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1102                         winbindd_flush_negative_conn_cache(domain);
1103                         set_domain_online_request(domain);
1104
1105                         /* we can be in trusted domain, which will contact primary domain
1106                          * we have to bring primary domain online in trusted domain process
1107                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1108                          * --> contact_domain = find_our_domain()
1109                          * */
1110                         if (domain != primary_domain) {
1111                                 winbindd_flush_negative_conn_cache(primary_domain);
1112                                 set_domain_online_request(primary_domain);
1113                         }
1114                 }
1115         }
1116 }
1117
1118 static void child_msg_dump_event_list(struct messaging_context *msg,
1119                                       void *private_data,
1120                                       uint32_t msg_type,
1121                                       struct server_id server_id,
1122                                       DATA_BLOB *data)
1123 {
1124         DEBUG(5,("child_msg_dump_event_list received\n"));
1125
1126         dump_event_list(winbind_event_context());
1127 }
1128
1129 bool winbindd_reinit_after_fork(const char *logfilename)
1130 {
1131         struct winbindd_domain *domain;
1132         struct winbindd_child *cl;
1133         NTSTATUS status;
1134
1135         status = reinit_after_fork(
1136                 winbind_messaging_context(),
1137                 winbind_event_context(),
1138                 procid_self(),
1139                 true);
1140         if (!NT_STATUS_IS_OK(status)) {
1141                 DEBUG(0,("reinit_after_fork() failed\n"));
1142                 return false;
1143         }
1144
1145         close_conns_after_fork();
1146
1147         if (!override_logfile && logfilename) {
1148                 lp_set_logfile(logfilename);
1149                 reopen_logs();
1150         }
1151
1152         if (!winbindd_setup_sig_term_handler(false))
1153                 return false;
1154         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1155                                             logfilename))
1156                 return false;
1157
1158         /* Stop zombies in children */
1159         CatchChild();
1160
1161         /* Don't handle the same messages as our parent. */
1162         messaging_deregister(winbind_messaging_context(),
1163                              MSG_SMB_CONF_UPDATED, NULL);
1164         messaging_deregister(winbind_messaging_context(),
1165                              MSG_SHUTDOWN, NULL);
1166         messaging_deregister(winbind_messaging_context(),
1167                              MSG_WINBIND_OFFLINE, NULL);
1168         messaging_deregister(winbind_messaging_context(),
1169                              MSG_WINBIND_ONLINE, NULL);
1170         messaging_deregister(winbind_messaging_context(),
1171                              MSG_WINBIND_ONLINESTATUS, NULL);
1172         messaging_deregister(winbind_messaging_context(),
1173                              MSG_DUMP_EVENT_LIST, NULL);
1174         messaging_deregister(winbind_messaging_context(),
1175                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1176         messaging_deregister(winbind_messaging_context(),
1177                              MSG_DEBUG, NULL);
1178
1179         /* We have destroyed all events in the winbindd_event_context
1180          * in reinit_after_fork(), so clean out all possible pending
1181          * event pointers. */
1182
1183         /* Deal with check_online_events. */
1184
1185         for (domain = domain_list(); domain; domain = domain->next) {
1186                 TALLOC_FREE(domain->check_online_event);
1187         }
1188
1189         /* Ensure we're not handling a credential cache event inherited
1190          * from our parent. */
1191
1192         ccache_remove_all_after_fork();
1193
1194         /* Destroy all possible events in child list. */
1195         for (cl = winbindd_children; cl != NULL; cl = cl->next) {
1196                 TALLOC_FREE(cl->lockout_policy_event);
1197                 TALLOC_FREE(cl->machine_password_change_event);
1198
1199                 /* Children should never be able to send
1200                  * each other messages, all messages must
1201                  * go through the parent.
1202                  */
1203                 cl->pid = (pid_t)0;
1204         }
1205         /*
1206          * This is a little tricky, children must not
1207          * send an MSG_WINBIND_ONLINE message to idmap_child().
1208          * If we are in a child of our primary domain or
1209          * in the process created by fork_child_dc_connect(),
1210          * and the primary domain cannot go online,
1211          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1212          * periodically to idmap_child().
1213          *
1214          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1215          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1216          * ---> init_dc_connection() ---> cm_open_connection --->
1217          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1218          * idmap_child(). Disallow children sending messages
1219          * to each other, all messages must go through the parent.
1220          */
1221         cl = idmap_child();
1222         cl->pid = (pid_t)0;
1223
1224         return true;
1225 }
1226
1227 /*
1228  * In a child there will be only one domain, reference that here.
1229  */
1230 static struct winbindd_domain *child_domain;
1231
1232 struct winbindd_domain *wb_child_domain(void)
1233 {
1234         return child_domain;
1235 }
1236
1237 static bool fork_domain_child(struct winbindd_child *child)
1238 {
1239         int fdpair[2];
1240         struct winbindd_cli_state state;
1241         struct winbindd_request request;
1242         struct winbindd_response response;
1243         struct winbindd_domain *primary_domain = NULL;
1244
1245         if (child->domain) {
1246                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1247                            child->domain->name));
1248         } else {
1249                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1250         }
1251
1252         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1253                 DEBUG(0, ("Could not open child pipe: %s\n",
1254                           strerror(errno)));
1255                 return False;
1256         }
1257
1258         ZERO_STRUCT(state);
1259         state.pid = sys_getpid();
1260         state.request = &request;
1261         state.response = &response;
1262
1263         child->pid = sys_fork();
1264
1265         if (child->pid == -1) {
1266                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1267                 return False;
1268         }
1269
1270         if (child->pid != 0) {
1271                 /* Parent */
1272                 close(fdpair[0]);
1273                 child->next = child->prev = NULL;
1274                 DLIST_ADD(winbindd_children, child);
1275                 child->sock = fdpair[1];
1276                 return True;
1277         }
1278
1279         /* Child */
1280         child_domain = child->domain;
1281
1282         DEBUG(10, ("Child process %d\n", (int)sys_getpid()));
1283
1284         state.sock = fdpair[0];
1285         close(fdpair[1]);
1286
1287         if (!winbindd_reinit_after_fork(child->logfilename)) {
1288                 _exit(0);
1289         }
1290
1291         /* Handle online/offline messages. */
1292         messaging_register(winbind_messaging_context(), NULL,
1293                            MSG_WINBIND_OFFLINE, child_msg_offline);
1294         messaging_register(winbind_messaging_context(), NULL,
1295                            MSG_WINBIND_ONLINE, child_msg_online);
1296         messaging_register(winbind_messaging_context(), NULL,
1297                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1298         messaging_register(winbind_messaging_context(), NULL,
1299                            MSG_DEBUG, debug_message);
1300         messaging_register(winbind_messaging_context(), NULL,
1301                            MSG_WINBIND_IP_DROPPED,
1302                            winbind_msg_ip_dropped);
1303
1304
1305         primary_domain = find_our_domain();
1306
1307         if (primary_domain == NULL) {
1308                 smb_panic("no primary domain found");
1309         }
1310
1311         /* It doesn't matter if we allow cache login,
1312          * try to bring domain online after fork. */
1313         if ( child->domain ) {
1314                 child->domain->startup = True;
1315                 child->domain->startup_time = time_mono(NULL);
1316                 /* we can be in primary domain or in trusted domain
1317                  * If we are in trusted domain, set the primary domain
1318                  * in start-up mode */
1319                 if (!(child->domain->internal)) {
1320                         set_domain_online_request(child->domain);
1321                         if (!(child->domain->primary)) {
1322                                 primary_domain->startup = True;
1323                                 primary_domain->startup_time = time_mono(NULL);
1324                                 set_domain_online_request(primary_domain);
1325                         }
1326                 }
1327         }
1328
1329         /*
1330          * We are in idmap child, make sure that we set the
1331          * check_online_event to bring primary domain online.
1332          */
1333         if (child == idmap_child()) {
1334                 set_domain_online_request(primary_domain);
1335         }
1336
1337         /* We might be in the idmap child...*/
1338         if (child->domain && !(child->domain->internal) &&
1339             lp_winbind_offline_logon()) {
1340
1341                 set_domain_online_request(child->domain);
1342
1343                 if (primary_domain && (primary_domain != child->domain)) {
1344                         /* We need to talk to the primary
1345                          * domain as well as the trusted
1346                          * domain inside a trusted domain
1347                          * child.
1348                          * See the code in :
1349                          * set_dc_type_and_flags_trustinfo()
1350                          * for details.
1351                          */
1352                         set_domain_online_request(primary_domain);
1353                 }
1354
1355                 child->lockout_policy_event = event_add_timed(
1356                         winbind_event_context(), NULL, timeval_zero(),
1357                         account_lockout_policy_handler,
1358                         child);
1359         }
1360
1361         if (child->domain && child->domain->primary &&
1362             !USE_KERBEROS_KEYTAB &&
1363             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1364
1365                 struct timeval next_change;
1366
1367                 if (calculate_next_machine_pwd_change(child->domain->name,
1368                                                        &next_change)) {
1369                         child->machine_password_change_event = event_add_timed(
1370                                 winbind_event_context(), NULL, next_change,
1371                                 machine_password_change_handler,
1372                                 child);
1373                 }
1374         }
1375
1376         while (1) {
1377
1378                 int ret = 0;
1379                 fd_set r_fds;
1380                 fd_set w_fds;
1381                 int maxfd;
1382                 struct timeval t;
1383                 struct timeval *tp;
1384                 struct timeval now;
1385                 TALLOC_CTX *frame = talloc_stackframe();
1386                 struct iovec iov[2];
1387                 int iov_count;
1388                 NTSTATUS status;
1389
1390                 if (run_events(winbind_event_context(), &ret, NULL, NULL)) {
1391                         TALLOC_FREE(frame);
1392                         continue;
1393                 }
1394
1395                 GetTimeOfDay(&now);
1396
1397                 if (child->domain && child->domain->startup &&
1398                                 (time_mono(NULL) > child->domain->startup_time + 30)) {
1399                         /* No longer in "startup" mode. */
1400                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1401                                 child->domain->name ));
1402                         child->domain->startup = False;
1403                 }
1404
1405                 FD_ZERO(&r_fds);
1406                 FD_ZERO(&w_fds);
1407                 FD_SET(state.sock, &r_fds);
1408                 maxfd = state.sock;
1409
1410                 /*
1411                  * Initialize this high as event_add_to_select_args()
1412                  * uses a timeval_min() on this and next_event. Fix
1413                  * from Roel van Meer <rolek@alt001.com>.
1414                  */
1415                 t.tv_sec = 999999;
1416                 t.tv_usec = 0;
1417
1418                 event_add_to_select_args(winbind_event_context(), &now,
1419                                          &r_fds, &w_fds, &t, &maxfd);
1420                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1421                 if (tp) {
1422                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1423                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1424                 }
1425
1426                 ret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, tp);
1427
1428                 if (run_events(winbind_event_context(), &ret, &r_fds, &w_fds)) {
1429                         /* We got a signal - continue. */
1430                         TALLOC_FREE(frame);
1431                         continue;
1432                 }
1433
1434                 if (ret == 0) {
1435                         DEBUG(11,("nothing is ready yet, continue\n"));
1436                         TALLOC_FREE(frame);
1437                         continue;
1438                 }
1439
1440                 if (ret == -1 && errno == EINTR) {
1441                         /* We got a signal - continue. */
1442                         TALLOC_FREE(frame);
1443                         continue;
1444                 }
1445
1446                 if (ret == -1 && errno != EINTR) {
1447                         DEBUG(0,("select error occured\n"));
1448                         TALLOC_FREE(frame);
1449                         perror("select");
1450                         _exit(1);
1451                 }
1452
1453                 /* fetch a request from the main daemon */
1454                 status = child_read_request(&state);
1455
1456                 if (!NT_STATUS_IS_OK(status)) {
1457                         /* we lost contact with our parent */
1458                         _exit(0);
1459                 }
1460
1461                 DEBUG(4,("child daemon request %d\n", (int)state.request->cmd));
1462
1463                 ZERO_STRUCTP(state.response);
1464                 state.request->null_term = '\0';
1465                 state.mem_ctx = frame;
1466                 child_process_request(child, &state);
1467
1468                 DEBUG(4, ("Finished processing child request %d\n",
1469                           (int)state.request->cmd));
1470
1471                 SAFE_FREE(state.request->extra_data.data);
1472
1473                 iov[0].iov_base = (void *)state.response;
1474                 iov[0].iov_len = sizeof(struct winbindd_response);
1475                 iov_count = 1;
1476
1477                 if (state.response->length > sizeof(struct winbindd_response)) {
1478                         iov[1].iov_base =
1479                                 (void *)state.response->extra_data.data;
1480                         iov[1].iov_len = state.response->length-iov[0].iov_len;
1481                         iov_count = 2;
1482                 }
1483
1484                 DEBUG(10, ("Writing %d bytes to parent\n",
1485                            (int)state.response->length));
1486
1487                 if (write_data_iov(state.sock, iov, iov_count) !=
1488                     state.response->length) {
1489                         DEBUG(0, ("Could not write result\n"));
1490                         exit(1);
1491                 }
1492                 TALLOC_FREE(frame);
1493         }
1494 }
1495
1496 void winbind_msg_ip_dropped_parent(struct messaging_context *msg_ctx,
1497                                    void *private_data,
1498                                    uint32_t msg_type,
1499                                    struct server_id server_id,
1500                                    DATA_BLOB *data)
1501 {
1502         struct winbindd_child *child;
1503
1504         winbind_msg_ip_dropped(msg_ctx, private_data, msg_type,
1505                                server_id, data);
1506
1507
1508         for (child = winbindd_children; child != NULL; child = child->next) {
1509                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
1510                                    msg_type, data->data, data->length);
1511         }
1512 }