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/wb_reqtrans.h"
  33 #include "secrets.h"
  34 #include "../lib/util/select.h"
  35 #include "../libcli/security/security.h"
  36 #include "system/select.h"
  37 #include "messages.h"
  38 #include "../lib/util/tevent_unix.h"
  39
  40 #undef DBGC_CLASS
  41 #define DBGC_CLASS DBGC_WINBIND
  42
  43 extern bool override_logfile;
  44 extern struct winbindd_methods cache_methods;
  45
  46 static struct winbindd_child *winbindd_children = NULL;
  47
  48 /* Read some data from a client connection */
  49
  50 static NTSTATUS child_read_request(struct winbindd_cli_state *state)
  51 {
  52         NTSTATUS status;
  53
  54         /* Read data */
  55
  56         status = read_data(state->sock, (char *)state->request,
  57                            sizeof(*state->request));
  58
  59         if (!NT_STATUS_IS_OK(status)) {
  60                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  61                           nt_errstr(status)));
  62                 return status;
  63         }
  64
  65         if (state->request->extra_len == 0) {
  66                 state->request->extra_data.data = NULL;
  67                 return NT_STATUS_OK;
  68         }
  69
  70         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request->extra_len));
  71
  72         state->request->extra_data.data =
  73                 SMB_MALLOC_ARRAY(char, state->request->extra_len + 1);
  74
  75         if (state->request->extra_data.data == NULL) {
  76                 DEBUG(0, ("malloc failed\n"));
  77                 return NT_STATUS_NO_MEMORY;
  78         }
  79
  80         /* Ensure null termination */
  81         state->request->extra_data.data[state->request->extra_len] = '\0';
  82
  83         status= read_data(state->sock, state->request->extra_data.data,
  84                           state->request->extra_len);
  85
  86         if (!NT_STATUS_IS_OK(status)) {
  87                 DEBUG(0, ("Could not read extra data: %s\n",
  88                           nt_errstr(status)));
  89         }
  90         return status;
  91 }
  92
  93 /*
  94  * Do winbind child async request. This is not simply wb_simple_trans. We have
  95  * to do the queueing ourselves because while a request is queued, the child
  96  * might have crashed, and we have to re-fork it in the _trigger function.
  97  */
  98
  99 struct wb_child_request_state {
 100         struct tevent_context *ev;
 101         struct winbindd_child *child;
 102         struct winbindd_request *request;
 103         struct winbindd_response *response;
 104 };
 105
 106 static bool fork_domain_child(struct winbindd_child *child);
 107
 108 static void wb_child_request_trigger(struct tevent_req *req,
 109                                             void *private_data);
 110 static void wb_child_request_done(struct tevent_req *subreq);
 111
 112 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
 113                                          struct tevent_context *ev,
 114                                          struct winbindd_child *child,
 115                                          struct winbindd_request *request)
 116 {
 117         struct tevent_req *req;
 118         struct wb_child_request_state *state;
 119
 120         req = tevent_req_create(mem_ctx, &state,
 121                                 struct wb_child_request_state);
 122         if (req == NULL) {
 123                 return NULL;
 124         }
 125
 126         state->ev = ev;
 127         state->child = child;
 128         state->request = request;
 129
 130         if (!tevent_queue_add(child->queue, ev, req,
 131                               wb_child_request_trigger, NULL)) {
 132                 tevent_req_oom(req);
 133                 return tevent_req_post(req, ev);
 134         }
 135         return req;
 136 }
 137
 138 static void wb_child_request_trigger(struct tevent_req *req,
 139                                      void *private_data)
 140 {
 141         struct wb_child_request_state *state = tevent_req_data(
 142                 req, struct wb_child_request_state);
 143         struct tevent_req *subreq;
 144
 145         if ((state->child->sock == -1) && (!fork_domain_child(state->child))) {
 146                 tevent_req_error(req, errno);
 147                 return;
 148         }
 149
 150         subreq = wb_simple_trans_send(state, winbind_event_context(), NULL,
 151                                       state->child->sock, state->request);
 152         if (tevent_req_nomem(subreq, req)) {
 153                 return;
 154         }
 155         tevent_req_set_callback(subreq, wb_child_request_done, req);
 156         tevent_req_set_endtime(req, state->ev, timeval_current_ofs(300, 0));
 157 }
 158
 159 static void wb_child_request_done(struct tevent_req *subreq)
 160 {
 161         struct tevent_req *req = tevent_req_callback_data(
 162                 subreq, struct tevent_req);
 163         struct wb_child_request_state *state = tevent_req_data(
 164                 req, struct wb_child_request_state);
 165         int ret, err;
 166
 167         ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
 168         TALLOC_FREE(subreq);
 169         if (ret == -1) {
 170                 /*
 171                  * The basic parent/child communication broke, close
 172                  * our socket
 173                  */
 174                 close(state->child->sock);
 175                 state->child->sock = -1;
 176                 DLIST_REMOVE(winbindd_children, state->child);
 177                 tevent_req_error(req, err);
 178                 return;
 179         }
 180         tevent_req_done(req);
 181 }
 182
 183 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 184                           struct winbindd_response **presponse, int *err)
 185 {
 186         struct wb_child_request_state *state = tevent_req_data(
 187                 req, struct wb_child_request_state);
 188
 189         if (tevent_req_is_unix_error(req, err)) {
 190                 return -1;
 191         }
 192         *presponse = talloc_move(mem_ctx, &state->response);
 193         return 0;
 194 }
 195
 196 static bool winbindd_child_busy(struct winbindd_child *child)
 197 {
 198         return tevent_queue_length(child->queue) > 0;
 199 }
 200
 201 static struct winbindd_child *find_idle_child(struct winbindd_domain *domain)
 202 {
 203         int i;
 204
 205         for (i=0; i<lp_winbind_max_domain_connections(); i++) {
 206                 if (!winbindd_child_busy(&domain->children[i])) {
 207                         return &domain->children[i];
 208                 }
 209         }
 210
 211         return NULL;
 212 }
 213
 214 struct winbindd_child *choose_domain_child(struct winbindd_domain *domain)
 215 {
 216         struct winbindd_child *result;
 217
 218         result = find_idle_child(domain);
 219         if (result != NULL) {
 220                 return result;
 221         }
 222         return &domain->children[rand() % lp_winbind_max_domain_connections()];
 223 }
 224
 225 struct dcerpc_binding_handle *dom_child_handle(struct winbindd_domain *domain)
 226 {
 227         struct winbindd_child *child;
 228
 229         child = choose_domain_child(domain);
 230         return child->binding_handle;
 231 }
 232
 233 struct wb_domain_request_state {
 234         struct tevent_context *ev;
 235         struct winbindd_domain *domain;
 236         struct winbindd_child *child;
 237         struct winbindd_request *request;
 238         struct winbindd_request *init_req;
 239         struct winbindd_response *response;
 240 };
 241
 242 static void wb_domain_request_gotdc(struct tevent_req *subreq);
 243 static void wb_domain_request_initialized(struct tevent_req *subreq);
 244 static void wb_domain_request_done(struct tevent_req *subreq);
 245
 246 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
 247                                           struct tevent_context *ev,
 248                                           struct winbindd_domain *domain,
 249                                           struct winbindd_request *request)
 250 {
 251         struct tevent_req *req, *subreq;
 252         struct wb_domain_request_state *state;
 253
 254         req = tevent_req_create(mem_ctx, &state,
 255                                 struct wb_domain_request_state);
 256         if (req == NULL) {
 257                 return NULL;
 258         }
 259
 260         state->child = choose_domain_child(domain);
 261
 262         if (domain->initialized) {
 263                 subreq = wb_child_request_send(state, ev, state->child,
 264                                                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_done, req);
 269                 return req;
 270         }
 271
 272         state->domain = domain;
 273         state->ev = ev;
 274         state->request = request;
 275
 276         state->init_req = talloc_zero(state, struct winbindd_request);
 277         if (tevent_req_nomem(state->init_req, req)) {
 278                 return tevent_req_post(req, ev);
 279         }
 280
 281         if (IS_DC || domain->primary || domain->internal) {
 282                 /* The primary domain has to find the DC name itself */
 283                 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 284                 fstrcpy(state->init_req->domain_name, domain->name);
 285                 state->init_req->data.init_conn.is_primary = domain->primary;
 286                 fstrcpy(state->init_req->data.init_conn.dcname, "");
 287
 288                 subreq = wb_child_request_send(state, ev, state->child,
 289                                                state->init_req);
 290                 if (tevent_req_nomem(subreq, req)) {
 291                         return tevent_req_post(req, ev);
 292                 }
 293                 tevent_req_set_callback(subreq, wb_domain_request_initialized,
 294                                         req);
 295                 return req;
 296         }
 297
 298         /*
 299          * Ask our DC for a DC name
 300          */
 301         domain = find_our_domain();
 302
 303         /* This is *not* the primary domain, let's ask our DC about a DC
 304          * name */
 305
 306         state->init_req->cmd = WINBINDD_GETDCNAME;
 307         fstrcpy(state->init_req->domain_name, domain->name);
 308
 309         subreq = wb_child_request_send(state, ev, state->child, request);
 310         if (tevent_req_nomem(subreq, req)) {
 311                 return tevent_req_post(req, ev);
 312         }
 313         tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
 314         return req;
 315 }
 316
 317 static void wb_domain_request_gotdc(struct tevent_req *subreq)
 318 {
 319         struct tevent_req *req = tevent_req_callback_data(
 320                 subreq, struct tevent_req);
 321         struct wb_domain_request_state *state = tevent_req_data(
 322                 req, struct wb_domain_request_state);
 323         struct winbindd_response *response;
 324         int ret, err;
 325
 326         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 327         TALLOC_FREE(subreq);
 328         if (ret == -1) {
 329                 tevent_req_error(req, err);
 330                 return;
 331         }
 332         state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 333         fstrcpy(state->init_req->domain_name, state->domain->name);
 334         state->init_req->data.init_conn.is_primary = False;
 335         fstrcpy(state->init_req->data.init_conn.dcname,
 336                 response->data.dc_name);
 337
 338         TALLOC_FREE(response);
 339
 340         subreq = wb_child_request_send(state, state->ev, state->child,
 341                                        state->init_req);
 342         if (tevent_req_nomem(subreq, req)) {
 343                 return;
 344         }
 345         tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
 346 }
 347
 348 static void wb_domain_request_initialized(struct tevent_req *subreq)
 349 {
 350         struct tevent_req *req = tevent_req_callback_data(
 351                 subreq, struct tevent_req);
 352         struct wb_domain_request_state *state = tevent_req_data(
 353                 req, struct wb_domain_request_state);
 354         struct winbindd_response *response;
 355         int ret, err;
 356
 357         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 358         TALLOC_FREE(subreq);
 359         if (ret == -1) {
 360                 tevent_req_error(req, err);
 361                 return;
 362         }
 363
 364         if (!string_to_sid(&state->domain->sid,
 365                            response->data.domain_info.sid)) {
 366                 DEBUG(1,("init_child_recv: Could not convert sid %s "
 367                         "from string\n", response->data.domain_info.sid));
 368                 tevent_req_error(req, EINVAL);
 369                 return;
 370         }
 371         fstrcpy(state->domain->name, response->data.domain_info.name);
 372         fstrcpy(state->domain->alt_name, response->data.domain_info.alt_name);
 373         state->domain->native_mode = response->data.domain_info.native_mode;
 374         state->domain->active_directory =
 375                 response->data.domain_info.active_directory;
 376         state->domain->initialized = true;
 377
 378         TALLOC_FREE(response);
 379
 380         subreq = wb_child_request_send(state, state->ev, state->child,
 381                                        state->request);
 382         if (tevent_req_nomem(subreq, req)) {
 383                 return;
 384         }
 385         tevent_req_set_callback(subreq, wb_domain_request_done, req);
 386 }
 387
 388 static void wb_domain_request_done(struct tevent_req *subreq)
 389 {
 390         struct tevent_req *req = tevent_req_callback_data(
 391                 subreq, struct tevent_req);
 392         struct wb_domain_request_state *state = tevent_req_data(
 393                 req, struct wb_domain_request_state);
 394         int ret, err;
 395
 396         ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
 397                                     &err);
 398         TALLOC_FREE(subreq);
 399         if (ret == -1) {
 400                 tevent_req_error(req, err);
 401                 return;
 402         }
 403         tevent_req_done(req);
 404 }
 405
 406 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 407                            struct winbindd_response **presponse, int *err)
 408 {
 409         struct wb_domain_request_state *state = tevent_req_data(
 410                 req, struct wb_domain_request_state);
 411
 412         if (tevent_req_is_unix_error(req, err)) {
 413                 return -1;
 414         }
 415         *presponse = talloc_move(mem_ctx, &state->response);
 416         return 0;
 417 }
 418
 419 static void child_process_request(struct winbindd_child *child,
 420                                   struct winbindd_cli_state *state)
 421 {
 422         struct winbindd_domain *domain = child->domain;
 423         const struct winbindd_child_dispatch_table *table = child->table;
 424
 425         /* Free response data - we may be interrupted and receive another
 426            command before being able to send this data off. */
 427
 428         state->response->result = WINBINDD_ERROR;
 429         state->response->length = sizeof(struct winbindd_response);
 430
 431         /* as all requests in the child are sync, we can use talloc_tos() */
 432         state->mem_ctx = talloc_tos();
 433
 434         /* Process command */
 435
 436         for (; table->name; table++) {
 437                 if (state->request->cmd == table->struct_cmd) {
 438                         DEBUG(10,("child_process_request: request fn %s\n",
 439                                   table->name));
 440                         state->response->result = table->struct_fn(domain, state);
 441                         return;
 442                 }
 443         }
 444
 445         DEBUG(1, ("child_process_request: unknown request fn number %d\n",
 446                   (int)state->request->cmd));
 447         state->response->result = WINBINDD_ERROR;
 448 }
 449
 450 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 451                  const struct winbindd_child_dispatch_table *table,
 452                  const char *logprefix,
 453                  const char *logname)
 454 {
 455         if (logprefix && logname) {
 456                 char *logbase = NULL;
 457
 458                 if (*lp_logfile()) {
 459                         char *end = NULL;
 460
 461                         if (asprintf(&logbase, "%s", lp_logfile()) < 0) {
 462                                 smb_panic("Internal error: asprintf failed");
 463                         }
 464
 465                         if ((end = strrchr_m(logbase, '/'))) {
 466                                 *end = '\0';
 467                         }
 468                 } else {
 469                         if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
 470                                 smb_panic("Internal error: asprintf failed");
 471                         }
 472                 }
 473
 474                 if (asprintf(&child->logfilename, "%s/%s-%s",
 475                              logbase, logprefix, logname) < 0) {
 476                         SAFE_FREE(logbase);
 477                         smb_panic("Internal error: asprintf failed");
 478                 }
 479
 480                 SAFE_FREE(logbase);
 481         } else {
 482                 smb_panic("Internal error: logprefix == NULL && "
 483                           "logname == NULL");
 484         }
 485
 486         child->sock = -1;
 487         child->domain = domain;
 488         child->table = table;
 489         child->queue = tevent_queue_create(NULL, "winbind_child");
 490         SMB_ASSERT(child->queue != NULL);
 491         child->binding_handle = wbint_binding_handle(NULL, domain, child);
 492         SMB_ASSERT(child->binding_handle != NULL);
 493 }
 494
 495 void winbind_child_died(pid_t pid)
 496 {
 497         struct winbindd_child *child;
 498
 499         for (child = winbindd_children; child != NULL; child = child->next) {
 500                 if (child->pid == pid) {
 501                         break;
 502                 }
 503         }
 504
 505         if (child == NULL) {
 506                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 507                 return;
 508         }
 509
 510         /* This will be re-added in fork_domain_child() */
 511
 512         DLIST_REMOVE(winbindd_children, child);
 513         child->pid = 0;
 514
 515         if (child->sock != -1) {
 516                 close(child->sock);
 517                 child->sock = -1;
 518         }
 519 }
 520
 521 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 522
 523 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 524 {
 525         flush_negative_conn_cache_for_domain(domain->name);
 526         if (*domain->alt_name) {
 527                 flush_negative_conn_cache_for_domain(domain->alt_name);
 528         }
 529 }
 530
 531 /*
 532  * Parent winbindd process sets its own debug level first and then
 533  * sends a message to all the winbindd children to adjust their debug
 534  * level to that of parents.
 535  */
 536
 537 void winbind_msg_debug(struct messaging_context *msg_ctx,
 538                          void *private_data,
 539                          uint32_t msg_type,
 540                          struct server_id server_id,
 541                          DATA_BLOB *data)
 542 {
 543         struct winbindd_child *child;
 544
 545         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 546
 547         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 548
 549         for (child = winbindd_children; child != NULL; child = child->next) {
 550
 551                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 552                         (unsigned int)child->pid));
 553
 554                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 555                            MSG_DEBUG,
 556                            data->data,
 557                            strlen((char *) data->data) + 1);
 558         }
 559 }
 560
 561 /* Set our domains as offline and forward the offline message to our children. */
 562
 563 void winbind_msg_offline(struct messaging_context *msg_ctx,
 564                          void *private_data,
 565                          uint32_t msg_type,
 566                          struct server_id server_id,
 567                          DATA_BLOB *data)
 568 {
 569         struct winbindd_child *child;
 570         struct winbindd_domain *domain;
 571
 572         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 573
 574         if (!lp_winbind_offline_logon()) {
 575                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 576                 return;
 577         }
 578
 579         /* Set our global state as offline. */
 580         if (!set_global_winbindd_state_offline()) {
 581                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 582                 return;
 583         }
 584
 585         /* Set all our domains as offline. */
 586         for (domain = domain_list(); domain; domain = domain->next) {
 587                 if (domain->internal) {
 588                         continue;
 589                 }
 590                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 591                 set_domain_offline(domain);
 592         }
 593
 594         for (child = winbindd_children; child != NULL; child = child->next) {
 595                 /* Don't send message to internal children.  We've already
 596                    done so above. */
 597                 if (!child->domain || winbindd_internal_child(child)) {
 598                         continue;
 599                 }
 600
 601                 /* Or internal domains (this should not be possible....) */
 602                 if (child->domain->internal) {
 603                         continue;
 604                 }
 605
 606                 /* Each winbindd child should only process requests for one domain - make sure
 607                    we only set it online / offline for that domain. */
 608
 609                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 610                         (unsigned int)child->pid, domain->name ));
 611
 612                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 613                                    MSG_WINBIND_OFFLINE,
 614                                    (uint8 *)child->domain->name,
 615                                    strlen(child->domain->name)+1);
 616         }
 617 }
 618
 619 /* Set our domains as online and forward the online message to our children. */
 620
 621 void winbind_msg_online(struct messaging_context *msg_ctx,
 622                         void *private_data,
 623                         uint32_t msg_type,
 624                         struct server_id server_id,
 625                         DATA_BLOB *data)
 626 {
 627         struct winbindd_child *child;
 628         struct winbindd_domain *domain;
 629
 630         DEBUG(10,("winbind_msg_online: got online message.\n"));
 631
 632         if (!lp_winbind_offline_logon()) {
 633                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 634                 return;
 635         }
 636
 637         /* Set our global state as online. */
 638         set_global_winbindd_state_online();
 639
 640         smb_nscd_flush_user_cache();
 641         smb_nscd_flush_group_cache();
 642
 643         /* Set all our domains as online. */
 644         for (domain = domain_list(); domain; domain = domain->next) {
 645                 if (domain->internal) {
 646                         continue;
 647                 }
 648                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 649
 650                 winbindd_flush_negative_conn_cache(domain);
 651                 set_domain_online_request(domain);
 652
 653                 /* Send an online message to the idmap child when our
 654                    primary domain comes back online */
 655
 656                 if ( domain->primary ) {
 657                         struct winbindd_child *idmap = idmap_child();
 658
 659                         if ( idmap->pid != 0 ) {
 660                                 messaging_send_buf(msg_ctx,
 661                                                    pid_to_procid(idmap->pid),
 662                                                    MSG_WINBIND_ONLINE,
 663                                                    (uint8 *)domain->name,
 664                                                    strlen(domain->name)+1);
 665                         }
 666                 }
 667         }
 668
 669         for (child = winbindd_children; child != NULL; child = child->next) {
 670                 /* Don't send message to internal childs. */
 671                 if (!child->domain || winbindd_internal_child(child)) {
 672                         continue;
 673                 }
 674
 675                 /* Or internal domains (this should not be possible....) */
 676                 if (child->domain->internal) {
 677                         continue;
 678                 }
 679
 680                 /* Each winbindd child should only process requests for one domain - make sure
 681                    we only set it online / offline for that domain. */
 682
 683                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 684                         (unsigned int)child->pid, child->domain->name ));
 685
 686                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 687                                    MSG_WINBIND_ONLINE,
 688                                    (uint8 *)child->domain->name,
 689                                    strlen(child->domain->name)+1);
 690         }
 691 }
 692
 693 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 694 {
 695         struct winbindd_domain *domain;
 696         char *buf = NULL;
 697
 698         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 699                                    get_global_winbindd_state_offline() ?
 700                                    "Offline":"Online")) == NULL) {
 701                 return NULL;
 702         }
 703
 704         for (domain = domain_list(); domain; domain = domain->next) {
 705                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 706                                                   domain->name,
 707                                                   domain->online ?
 708                                                   "Online":"Offline")) == NULL) {
 709                         return NULL;
 710                 }
 711         }
 712
 713         buf = talloc_asprintf_append_buffer(buf, "\n");
 714
 715         DEBUG(5,("collect_onlinestatus: %s", buf));
 716
 717         return buf;
 718 }
 719
 720 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 721                               void *private_data,
 722                               uint32_t msg_type,
 723                               struct server_id server_id,
 724                               DATA_BLOB *data)
 725 {
 726         TALLOC_CTX *mem_ctx;
 727         const char *message;
 728         struct server_id *sender;
 729
 730         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 731
 732         if (!data->data) {
 733                 return;
 734         }
 735
 736         sender = (struct server_id *)data->data;
 737
 738         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 739         if (mem_ctx == NULL) {
 740                 return;
 741         }
 742
 743         message = collect_onlinestatus(mem_ctx);
 744         if (message == NULL) {
 745                 talloc_destroy(mem_ctx);
 746                 return;
 747         }
 748
 749         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 750                            (const uint8 *)message, strlen(message) + 1);
 751
 752         talloc_destroy(mem_ctx);
 753 }
 754
 755 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 756                                  void *private_data,
 757                                  uint32_t msg_type,
 758                                  struct server_id server_id,
 759                                  DATA_BLOB *data)
 760 {
 761         struct winbindd_child *child;
 762
 763         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 764
 765         dump_event_list(winbind_event_context());
 766
 767         for (child = winbindd_children; child != NULL; child = child->next) {
 768
 769                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 770                         (unsigned int)child->pid));
 771
 772                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 773                                    MSG_DUMP_EVENT_LIST,
 774                                    NULL, 0);
 775         }
 776
 777 }
 778
 779 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 780                                   void *private_data,
 781                                   uint32_t msg_type,
 782                                   struct server_id server_id,
 783                                   DATA_BLOB *data)
 784 {
 785         TALLOC_CTX *mem_ctx;
 786         const char *message = NULL;
 787         struct server_id *sender = NULL;
 788         const char *domain = NULL;
 789         char *s = NULL;
 790         NTSTATUS status;
 791         struct winbindd_domain *dom = NULL;
 792
 793         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 794
 795         if (!data || !data->data) {
 796                 return;
 797         }
 798
 799         if (data->length < sizeof(struct server_id)) {
 800                 return;
 801         }
 802
 803         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 804         if (!mem_ctx) {
 805                 return;
 806         }
 807
 808         sender = (struct server_id *)data->data;
 809         if (data->length > sizeof(struct server_id)) {
 810                 domain = (const char *)data->data+sizeof(struct server_id);
 811         }
 812
 813         if (domain) {
 814
 815                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 816                         domain));
 817
 818                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 819                                                   find_domain_from_name_noinit(domain));
 820                 if (!message) {
 821                         talloc_destroy(mem_ctx);
 822                         return;
 823                 }
 824
 825                 messaging_send_buf(msg_ctx, *sender,
 826                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 827                                    (const uint8_t *)message, strlen(message) + 1);
 828
 829                 talloc_destroy(mem_ctx);
 830
 831                 return;
 832         }
 833
 834         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 835
 836         for (dom = domain_list(); dom; dom=dom->next) {
 837                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 838                 if (!message) {
 839                         talloc_destroy(mem_ctx);
 840                         return;
 841                 }
 842
 843                 s = talloc_asprintf_append(s, "%s\n", message);
 844                 if (!s) {
 845                         talloc_destroy(mem_ctx);
 846                         return;
 847                 }
 848         }
 849
 850         status = messaging_send_buf(msg_ctx, *sender,
 851                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 852                                     (uint8_t *)s, strlen(s) + 1);
 853         if (!NT_STATUS_IS_OK(status)) {
 854                 DEBUG(0,("failed to send message: %s\n",
 855                 nt_errstr(status)));
 856         }
 857
 858         talloc_destroy(mem_ctx);
 859 }
 860
 861 static void account_lockout_policy_handler(struct event_context *ctx,
 862                                            struct timed_event *te,
 863                                            struct timeval now,
 864                                            void *private_data)
 865 {
 866         struct winbindd_child *child =
 867                 (struct winbindd_child *)private_data;
 868         TALLOC_CTX *mem_ctx = NULL;
 869         struct winbindd_methods *methods;
 870         struct samr_DomInfo12 lockout_policy;
 871         NTSTATUS result;
 872
 873         DEBUG(10,("account_lockout_policy_handler called\n"));
 874
 875         TALLOC_FREE(child->lockout_policy_event);
 876
 877         if ( !winbindd_can_contact_domain( child->domain ) ) {
 878                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 879                           "do not have an incoming trust to domain %s\n",
 880                           child->domain->name));
 881
 882                 return;
 883         }
 884
 885         methods = child->domain->methods;
 886
 887         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 888         if (!mem_ctx) {
 889                 result = NT_STATUS_NO_MEMORY;
 890         } else {
 891                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 892         }
 893         TALLOC_FREE(mem_ctx);
 894
 895         if (!NT_STATUS_IS_OK(result)) {
 896                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 897                          nt_errstr(result)));
 898         }
 899
 900         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 901                                                       timeval_current_ofs(3600, 0),
 902                                                       account_lockout_policy_handler,
 903                                                       child);
 904 }
 905
 906 static time_t get_machine_password_timeout(void)
 907 {
 908         /* until we have gpo support use lp setting */
 909         return lp_machine_password_timeout();
 910 }
 911
 912 static bool calculate_next_machine_pwd_change(const char *domain,
 913                                               struct timeval *t)
 914 {
 915         time_t pass_last_set_time;
 916         time_t timeout;
 917         time_t next_change;
 918         struct timeval tv;
 919         char *pw;
 920
 921         pw = secrets_fetch_machine_password(domain,
 922                                             &pass_last_set_time,
 923                                             NULL);
 924
 925         if (pw == NULL) {
 926                 DEBUG(0,("cannot fetch own machine password ????"));
 927                 return false;
 928         }
 929
 930         SAFE_FREE(pw);
 931
 932         timeout = get_machine_password_timeout();
 933         if (timeout == 0) {
 934                 DEBUG(10,("machine password never expires\n"));
 935                 return false;
 936         }
 937
 938         tv.tv_sec = pass_last_set_time;
 939         DEBUG(10, ("password last changed %s\n",
 940                    timeval_string(talloc_tos(), &tv, false)));
 941         tv.tv_sec += timeout;
 942         DEBUGADD(10, ("password valid until %s\n",
 943                       timeval_string(talloc_tos(), &tv, false)));
 944
 945         if (time(NULL) < (pass_last_set_time + timeout)) {
 946                 next_change = pass_last_set_time + timeout;
 947                 DEBUG(10,("machine password still valid until: %s\n",
 948                         http_timestring(talloc_tos(), next_change)));
 949                 *t = timeval_set(next_change, 0);
 950
 951                 if (lp_clustering()) {
 952                         uint8_t randbuf;
 953                         /*
 954                          * When having a cluster, we have several
 955                          * winbinds racing for the password change. In
 956                          * the machine_password_change_handler()
 957                          * function we check if someone else was
 958                          * faster when the event triggers. We add a
 959                          * 255-second random delay here, so that we
 960                          * don't run to change the password at the
 961                          * exact same moment.
 962                          */
 963                         generate_random_buffer(&randbuf, sizeof(randbuf));
 964                         DEBUG(10, ("adding %d seconds randomness\n",
 965                                    (int)randbuf));
 966                         t->tv_sec += randbuf;
 967                 }
 968                 return true;
 969         }
 970
 971         DEBUG(10,("machine password expired, needs immediate change\n"));
 972
 973         *t = timeval_zero();
 974
 975         return true;
 976 }
 977
 978 static void machine_password_change_handler(struct event_context *ctx,
 979                                             struct timed_event *te,
 980                                             struct timeval now,
 981                                             void *private_data)
 982 {
 983         struct winbindd_child *child =
 984                 (struct winbindd_child *)private_data;
 985         struct rpc_pipe_client *netlogon_pipe = NULL;
 986         TALLOC_CTX *frame;
 987         NTSTATUS result;
 988         struct timeval next_change;
 989
 990         DEBUG(10,("machine_password_change_handler called\n"));
 991
 992         TALLOC_FREE(child->machine_password_change_event);
 993
 994         if (!calculate_next_machine_pwd_change(child->domain->name,
 995                                                &next_change)) {
 996                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
 997                 return;
 998         }
 999
1000         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1001                    timeval_string(talloc_tos(), &next_change, false)));
1002
1003         if (!timeval_expired(&next_change)) {
1004                 DEBUG(10, ("Someone else has already changed the pw\n"));
1005                 goto done;
1006         }
1007
1008         if (!winbindd_can_contact_domain(child->domain)) {
1009                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
1010                           "do not have an incoming trust to domain %s\n",
1011                           child->domain->name));
1012                 return;
1013         }
1014
1015         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
1016         if (!NT_STATUS_IS_OK(result)) {
1017                 DEBUG(10,("machine_password_change_handler: "
1018                         "failed to connect netlogon pipe: %s\n",
1019                          nt_errstr(result)));
1020                 return;
1021         }
1022
1023         frame = talloc_stackframe();
1024
1025         result = trust_pw_find_change_and_store_it(netlogon_pipe,
1026                                                    frame,
1027                                                    child->domain->name);
1028         TALLOC_FREE(frame);
1029
1030         DEBUG(10, ("machine_password_change_handler: "
1031                    "trust_pw_find_change_and_store_it returned %s\n",
1032                    nt_errstr(result)));
1033
1034         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
1035                 DEBUG(3,("machine_password_change_handler: password set returned "
1036                          "ACCESS_DENIED.  Maybe the trust account "
1037                          "password was changed and we didn't know it. "
1038                          "Killing connections to domain %s\n",
1039                          child->domain->name));
1040                 TALLOC_FREE(child->domain->conn.netlogon_pipe);
1041         }
1042
1043         if (!calculate_next_machine_pwd_change(child->domain->name,
1044                                                &next_change)) {
1045                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1046                 return;
1047         }
1048
1049         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1050                    timeval_string(talloc_tos(), &next_change, false)));
1051
1052         if (!NT_STATUS_IS_OK(result)) {
1053                 struct timeval tmp;
1054                 /*
1055                  * In case of failure, give the DC a minute to recover
1056                  */
1057                 tmp = timeval_current_ofs(60, 0);
1058                 next_change = timeval_max(&next_change, &tmp);
1059         }
1060
1061 done:
1062         child->machine_password_change_event = event_add_timed(winbind_event_context(), NULL,
1063                                                               next_change,
1064                                                               machine_password_change_handler,
1065                                                               child);
1066 }
1067
1068 /* Deal with a request to go offline. */
1069
1070 static void child_msg_offline(struct messaging_context *msg,
1071                               void *private_data,
1072                               uint32_t msg_type,
1073                               struct server_id server_id,
1074                               DATA_BLOB *data)
1075 {
1076         struct winbindd_domain *domain;
1077         struct winbindd_domain *primary_domain = NULL;
1078         const char *domainname = (const char *)data->data;
1079
1080         if (data->data == NULL || data->length == 0) {
1081                 return;
1082         }
1083
1084         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1085
1086         if (!lp_winbind_offline_logon()) {
1087                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1088                 return;
1089         }
1090
1091         primary_domain = find_our_domain();
1092
1093         /* Mark the requested domain offline. */
1094
1095         for (domain = domain_list(); domain; domain = domain->next) {
1096                 if (domain->internal) {
1097                         continue;
1098                 }
1099                 if (strequal(domain->name, domainname)) {
1100                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1101                         set_domain_offline(domain);
1102                         /* we are in the trusted domain, set the primary domain
1103                          * offline too */
1104                         if (domain != primary_domain) {
1105                                 set_domain_offline(primary_domain);
1106                         }
1107                 }
1108         }
1109 }
1110
1111 /* Deal with a request to go online. */
1112
1113 static void child_msg_online(struct messaging_context *msg,
1114                              void *private_data,
1115                              uint32_t msg_type,
1116                              struct server_id server_id,
1117                              DATA_BLOB *data)
1118 {
1119         struct winbindd_domain *domain;
1120         struct winbindd_domain *primary_domain = NULL;
1121         const char *domainname = (const char *)data->data;
1122
1123         if (data->data == NULL || data->length == 0) {
1124                 return;
1125         }
1126
1127         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1128
1129         if (!lp_winbind_offline_logon()) {
1130                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1131                 return;
1132         }
1133
1134         primary_domain = find_our_domain();
1135
1136         /* Set our global state as online. */
1137         set_global_winbindd_state_online();
1138
1139         /* Try and mark everything online - delete any negative cache entries
1140            to force a reconnect now. */
1141
1142         for (domain = domain_list(); domain; domain = domain->next) {
1143                 if (domain->internal) {
1144                         continue;
1145                 }
1146                 if (strequal(domain->name, domainname)) {
1147                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1148                         winbindd_flush_negative_conn_cache(domain);
1149                         set_domain_online_request(domain);
1150
1151                         /* we can be in trusted domain, which will contact primary domain
1152                          * we have to bring primary domain online in trusted domain process
1153                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1154                          * --> contact_domain = find_our_domain()
1155                          * */
1156                         if (domain != primary_domain) {
1157                                 winbindd_flush_negative_conn_cache(primary_domain);
1158                                 set_domain_online_request(primary_domain);
1159                         }
1160                 }
1161         }
1162 }
1163
1164 static void child_msg_dump_event_list(struct messaging_context *msg,
1165                                       void *private_data,
1166                                       uint32_t msg_type,
1167                                       struct server_id server_id,
1168                                       DATA_BLOB *data)
1169 {
1170         DEBUG(5,("child_msg_dump_event_list received\n"));
1171
1172         dump_event_list(winbind_event_context());
1173 }
1174
1175 NTSTATUS winbindd_reinit_after_fork(const struct winbindd_child *myself,
1176                                     const char *logfilename)
1177 {
1178         struct winbindd_domain *domain;
1179         struct winbindd_child *cl;
1180         NTSTATUS status;
1181
1182         status = reinit_after_fork(
1183                 winbind_messaging_context(),
1184                 winbind_event_context(),
1185                 true);
1186         if (!NT_STATUS_IS_OK(status)) {
1187                 DEBUG(0,("reinit_after_fork() failed\n"));
1188                 return status;
1189         }
1190
1191         close_conns_after_fork();
1192
1193         if (!override_logfile && logfilename) {
1194                 lp_set_logfile(logfilename);
1195                 reopen_logs();
1196         }
1197
1198         if (!winbindd_setup_sig_term_handler(false))
1199                 return NT_STATUS_NO_MEMORY;
1200         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1201                                             logfilename))
1202                 return NT_STATUS_NO_MEMORY;
1203
1204         /* Stop zombies in children */
1205         CatchChild();
1206
1207         /* Don't handle the same messages as our parent. */
1208         messaging_deregister(winbind_messaging_context(),
1209                              MSG_SMB_CONF_UPDATED, NULL);
1210         messaging_deregister(winbind_messaging_context(),
1211                              MSG_SHUTDOWN, NULL);
1212         messaging_deregister(winbind_messaging_context(),
1213                              MSG_WINBIND_OFFLINE, NULL);
1214         messaging_deregister(winbind_messaging_context(),
1215                              MSG_WINBIND_ONLINE, NULL);
1216         messaging_deregister(winbind_messaging_context(),
1217                              MSG_WINBIND_ONLINESTATUS, NULL);
1218         messaging_deregister(winbind_messaging_context(),
1219                              MSG_DUMP_EVENT_LIST, NULL);
1220         messaging_deregister(winbind_messaging_context(),
1221                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1222         messaging_deregister(winbind_messaging_context(),
1223                              MSG_DEBUG, NULL);
1224
1225         /* We have destroyed all events in the winbindd_event_context
1226          * in reinit_after_fork(), so clean out all possible pending
1227          * event pointers. */
1228
1229         /* Deal with check_online_events. */
1230
1231         for (domain = domain_list(); domain; domain = domain->next) {
1232                 TALLOC_FREE(domain->check_online_event);
1233         }
1234
1235         /* Ensure we're not handling a credential cache event inherited
1236          * from our parent. */
1237
1238         ccache_remove_all_after_fork();
1239
1240         /* Destroy all possible events in child list. */
1241         for (cl = winbindd_children; cl != NULL; cl = cl->next) {
1242                 TALLOC_FREE(cl->lockout_policy_event);
1243                 TALLOC_FREE(cl->machine_password_change_event);
1244
1245                 /* Children should never be able to send
1246                  * each other messages, all messages must
1247                  * go through the parent.
1248                  */
1249                 cl->pid = (pid_t)0;
1250
1251                 /*
1252                  * Close service sockets to all other children
1253                  */
1254                 if ((cl != myself) && (cl->sock != -1)) {
1255                         close(cl->sock);
1256                         cl->sock = -1;
1257                 }
1258         }
1259         /*
1260          * This is a little tricky, children must not
1261          * send an MSG_WINBIND_ONLINE message to idmap_child().
1262          * If we are in a child of our primary domain or
1263          * in the process created by fork_child_dc_connect(),
1264          * and the primary domain cannot go online,
1265          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1266          * periodically to idmap_child().
1267          *
1268          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1269          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1270          * ---> init_dc_connection() ---> cm_open_connection --->
1271          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1272          * idmap_child(). Disallow children sending messages
1273          * to each other, all messages must go through the parent.
1274          */
1275         cl = idmap_child();
1276         cl->pid = (pid_t)0;
1277
1278         return NT_STATUS_OK;
1279 }
1280
1281 /*
1282  * In a child there will be only one domain, reference that here.
1283  */
1284 static struct winbindd_domain *child_domain;
1285
1286 struct winbindd_domain *wb_child_domain(void)
1287 {
1288         return child_domain;
1289 }
1290
1291 static bool fork_domain_child(struct winbindd_child *child)
1292 {
1293         int fdpair[2];
1294         struct winbindd_cli_state state;
1295         struct winbindd_request request;
1296         struct winbindd_response response;
1297         struct winbindd_domain *primary_domain = NULL;
1298         NTSTATUS status;
1299         ssize_t nwritten;
1300
1301         if (child->domain) {
1302                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1303                            child->domain->name));
1304         } else {
1305                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1306         }
1307
1308         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1309                 DEBUG(0, ("Could not open child pipe: %s\n",
1310                           strerror(errno)));
1311                 return False;
1312         }
1313
1314         ZERO_STRUCT(state);
1315         state.pid = getpid();
1316         state.request = &request;
1317         state.response = &response;
1318
1319         child->pid = fork();
1320
1321         if (child->pid == -1) {
1322                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1323                 return False;
1324         }
1325
1326         if (child->pid != 0) {
1327                 /* Parent */
1328                 ssize_t nread;
1329
1330                 close(fdpair[0]);
1331
1332                 nread = sys_read(fdpair[1], &status, sizeof(status));
1333                 if (nread != sizeof(status)) {
1334                         DEBUG(1, ("fork_domain_child: Could not read child status: "
1335                                   "nread=%d, error=%s\n", (int)nread,
1336                                   strerror(errno)));
1337                         close(fdpair[1]);
1338                         return false;
1339                 }
1340                 if (!NT_STATUS_IS_OK(status)) {
1341                         DEBUG(1, ("fork_domain_child: Child status is %s\n",
1342                                   nt_errstr(status)));
1343                         close(fdpair[1]);
1344                         return false;
1345                 }
1346
1347                 child->next = child->prev = NULL;
1348                 DLIST_ADD(winbindd_children, child);
1349                 child->sock = fdpair[1];
1350                 return True;
1351         }
1352
1353         /* Child */
1354         child_domain = child->domain;
1355
1356         DEBUG(10, ("Child process %d\n", (int)getpid()));
1357
1358         state.sock = fdpair[0];
1359         close(fdpair[1]);
1360
1361         status = winbindd_reinit_after_fork(child, child->logfilename);
1362
1363         nwritten = sys_write(state.sock, &status, sizeof(status));
1364         if (nwritten != sizeof(status)) {
1365                 DEBUG(1, ("fork_domain_child: Could not write status: "
1366                           "nwritten=%d, error=%s\n", (int)nwritten,
1367                           strerror(errno)));
1368                 _exit(0);
1369         }
1370         if (!NT_STATUS_IS_OK(status)) {
1371                 DEBUG(1, ("winbindd_reinit_after_fork failed: %s\n",
1372                           nt_errstr(status)));
1373                 _exit(0);
1374         }
1375
1376         /* Handle online/offline messages. */
1377         messaging_register(winbind_messaging_context(), NULL,
1378                            MSG_WINBIND_OFFLINE, child_msg_offline);
1379         messaging_register(winbind_messaging_context(), NULL,
1380                            MSG_WINBIND_ONLINE, child_msg_online);
1381         messaging_register(winbind_messaging_context(), NULL,
1382                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1383         messaging_register(winbind_messaging_context(), NULL,
1384                            MSG_DEBUG, debug_message);
1385         messaging_register(winbind_messaging_context(), NULL,
1386                            MSG_WINBIND_IP_DROPPED,
1387                            winbind_msg_ip_dropped);
1388
1389
1390         primary_domain = find_our_domain();
1391
1392         if (primary_domain == NULL) {
1393                 smb_panic("no primary domain found");
1394         }
1395
1396         /* It doesn't matter if we allow cache login,
1397          * try to bring domain online after fork. */
1398         if ( child->domain ) {
1399                 child->domain->startup = True;
1400                 child->domain->startup_time = time_mono(NULL);
1401                 /* we can be in primary domain or in trusted domain
1402                  * If we are in trusted domain, set the primary domain
1403                  * in start-up mode */
1404                 if (!(child->domain->internal)) {
1405                         set_domain_online_request(child->domain);
1406                         if (!(child->domain->primary)) {
1407                                 primary_domain->startup = True;
1408                                 primary_domain->startup_time = time_mono(NULL);
1409                                 set_domain_online_request(primary_domain);
1410                         }
1411                 }
1412         }
1413
1414         /*
1415          * We are in idmap child, make sure that we set the
1416          * check_online_event to bring primary domain online.
1417          */
1418         if (child == idmap_child()) {
1419                 set_domain_online_request(primary_domain);
1420         }
1421
1422         /* We might be in the idmap child...*/
1423         if (child->domain && !(child->domain->internal) &&
1424             lp_winbind_offline_logon()) {
1425
1426                 set_domain_online_request(child->domain);
1427
1428                 if (primary_domain && (primary_domain != child->domain)) {
1429                         /* We need to talk to the primary
1430                          * domain as well as the trusted
1431                          * domain inside a trusted domain
1432                          * child.
1433                          * See the code in :
1434                          * set_dc_type_and_flags_trustinfo()
1435                          * for details.
1436                          */
1437                         set_domain_online_request(primary_domain);
1438                 }
1439
1440                 child->lockout_policy_event = event_add_timed(
1441                         winbind_event_context(), NULL, timeval_zero(),
1442                         account_lockout_policy_handler,
1443                         child);
1444         }
1445
1446         if (child->domain && child->domain->primary &&
1447             !USE_KERBEROS_KEYTAB &&
1448             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1449
1450                 struct timeval next_change;
1451
1452                 if (calculate_next_machine_pwd_change(child->domain->name,
1453                                                        &next_change)) {
1454                         child->machine_password_change_event = event_add_timed(
1455                                 winbind_event_context(), NULL, next_change,
1456                                 machine_password_change_handler,
1457                                 child);
1458                 }
1459         }
1460
1461         while (1) {
1462
1463                 int ret;
1464                 struct pollfd *pfds;
1465                 int num_pfds;
1466                 int timeout;
1467                 struct timeval t;
1468                 struct timeval *tp;
1469                 TALLOC_CTX *frame = talloc_stackframe();
1470                 struct iovec iov[2];
1471                 int iov_count;
1472
1473                 if (run_events_poll(winbind_event_context(), 0, NULL, 0)) {
1474                         TALLOC_FREE(frame);
1475                         continue;
1476                 }
1477
1478                 if (child->domain && child->domain->startup &&
1479                                 (time_mono(NULL) > child->domain->startup_time + 30)) {
1480                         /* No longer in "startup" mode. */
1481                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1482                                 child->domain->name ));
1483                         child->domain->startup = False;
1484                 }
1485
1486                 pfds = talloc_zero(talloc_tos(), struct pollfd);
1487                 if (pfds == NULL) {
1488                         DEBUG(1, ("talloc failed\n"));
1489                         _exit(1);
1490                 }
1491
1492                 pfds->fd = state.sock;
1493                 pfds->events = POLLIN|POLLHUP;
1494                 num_pfds = 1;
1495
1496                 timeout = INT_MAX;
1497
1498                 if (!event_add_to_poll_args(
1499                             winbind_event_context(), talloc_tos(),
1500                             &pfds, &num_pfds, &timeout)) {
1501                         DEBUG(1, ("event_add_to_poll_args failed\n"));
1502                         _exit(1);
1503                 }
1504                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1505                 if (tp) {
1506                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1507                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1508                 }
1509
1510                 ret = poll(pfds, num_pfds, timeout);
1511
1512                 if (run_events_poll(winbind_event_context(), ret,
1513                                     pfds, num_pfds)) {
1514                         /* We got a signal - continue. */
1515                         TALLOC_FREE(frame);
1516                         continue;
1517                 }
1518
1519                 TALLOC_FREE(pfds);
1520
1521                 if (ret == 0) {
1522                         DEBUG(11,("nothing is ready yet, continue\n"));
1523                         TALLOC_FREE(frame);
1524                         continue;
1525                 }
1526
1527                 if (ret == -1 && errno == EINTR) {
1528                         /* We got a signal - continue. */
1529                         TALLOC_FREE(frame);
1530                         continue;
1531                 }
1532
1533                 if (ret == -1 && errno != EINTR) {
1534                         DEBUG(0,("poll error occured\n"));
1535                         TALLOC_FREE(frame);
1536                         perror("poll");
1537                         _exit(1);
1538                 }
1539
1540                 /* fetch a request from the main daemon */
1541                 status = child_read_request(&state);
1542
1543                 if (!NT_STATUS_IS_OK(status)) {
1544                         /* we lost contact with our parent */
1545                         _exit(0);
1546                 }
1547
1548                 DEBUG(4,("child daemon request %d\n", (int)state.request->cmd));
1549
1550                 ZERO_STRUCTP(state.response);
1551                 state.request->null_term = '\0';
1552                 state.mem_ctx = frame;
1553                 child_process_request(child, &state);
1554
1555                 DEBUG(4, ("Finished processing child request %d\n",
1556                           (int)state.request->cmd));
1557
1558                 SAFE_FREE(state.request->extra_data.data);
1559
1560                 iov[0].iov_base = (void *)state.response;
1561                 iov[0].iov_len = sizeof(struct winbindd_response);
1562                 iov_count = 1;
1563
1564                 if (state.response->length > sizeof(struct winbindd_response)) {
1565                         iov[1].iov_base =
1566                                 (void *)state.response->extra_data.data;
1567                         iov[1].iov_len = state.response->length-iov[0].iov_len;
1568                         iov_count = 2;
1569                 }
1570
1571                 DEBUG(10, ("Writing %d bytes to parent\n",
1572                            (int)state.response->length));
1573
1574                 if (write_data_iov(state.sock, iov, iov_count) !=
1575                     state.response->length) {
1576                         DEBUG(0, ("Could not write result\n"));
1577                         exit(1);
1578                 }
1579                 TALLOC_FREE(frame);
1580         }
1581 }
1582
1583 void winbind_msg_ip_dropped_parent(struct messaging_context *msg_ctx,
1584                                    void *private_data,
1585                                    uint32_t msg_type,
1586                                    struct server_id server_id,
1587                                    DATA_BLOB *data)
1588 {
1589         struct winbindd_child *child;
1590
1591         winbind_msg_ip_dropped(msg_ctx, private_data, msg_type,
1592                                server_id, data);
1593
1594
1595         for (child = winbindd_children; child != NULL; child = child->next) {
1596                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
1597                                    msg_type, data->data, data->length);
1598         }
1599 }