source3/winbindd/winbindd_dual.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind child daemons
   5
   6    Copyright (C) Andrew Tridgell 2002
   7    Copyright (C) Volker Lendecke 2004,2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 /*
  24  * We fork a child per domain to be able to act non-blocking in the main
  25  * winbind daemon. A domain controller thousands of miles away being being
  26  * slow replying with a 10.000 user list should not hold up netlogon calls
  27  * that can be handled locally.
  28  */
  29
  30 #include "includes.h"
  31 #include "winbindd.h"
  32 #include "../../nsswitch/libwbclient/wbc_async.h"
  33
  34 #undef DBGC_CLASS
  35 #define DBGC_CLASS DBGC_WINBIND
  36
  37 extern bool override_logfile;
  38 extern struct winbindd_methods cache_methods;
  39
  40 /* Read some data from a client connection */
  41
  42 static NTSTATUS child_read_request(struct winbindd_cli_state *state)
  43 {
  44         NTSTATUS status;
  45
  46         /* Read data */
  47
  48         status = read_data(state->sock, (char *)state->request,
  49                            sizeof(*state->request));
  50
  51         if (!NT_STATUS_IS_OK(status)) {
  52                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  53                           nt_errstr(status)));
  54                 return status;
  55         }
  56
  57         if (state->request->extra_len == 0) {
  58                 state->request->extra_data.data = NULL;
  59                 return NT_STATUS_OK;
  60         }
  61
  62         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request->extra_len));
  63
  64         state->request->extra_data.data =
  65                 SMB_MALLOC_ARRAY(char, state->request->extra_len + 1);
  66
  67         if (state->request->extra_data.data == NULL) {
  68                 DEBUG(0, ("malloc failed\n"));
  69                 return NT_STATUS_NO_MEMORY;
  70         }
  71
  72         /* Ensure null termination */
  73         state->request->extra_data.data[state->request->extra_len] = '\0';
  74
  75         status= read_data(state->sock, state->request->extra_data.data,
  76                           state->request->extra_len);
  77
  78         if (!NT_STATUS_IS_OK(status)) {
  79                 DEBUG(0, ("Could not read extra data: %s\n",
  80                           nt_errstr(status)));
  81         }
  82         return status;
  83 }
  84
  85 /*
  86  * Do winbind child async request. This is not simply wb_simple_trans. We have
  87  * to do the queueing ourselves because while a request is queued, the child
  88  * might have crashed, and we have to re-fork it in the _trigger function.
  89  */
  90
  91 struct wb_child_request_state {
  92         struct tevent_context *ev;
  93         struct winbindd_child *child;
  94         struct winbindd_request *request;
  95         struct winbindd_response *response;
  96 };
  97
  98 static bool fork_domain_child(struct winbindd_child *child);
  99
 100 static void wb_child_request_trigger(struct tevent_req *req,
 101                                             void *private_data);
 102 static void wb_child_request_done(struct tevent_req *subreq);
 103
 104 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
 105                                          struct tevent_context *ev,
 106                                          struct winbindd_child *child,
 107                                          struct winbindd_request *request)
 108 {
 109         struct tevent_req *req;
 110         struct wb_child_request_state *state;
 111
 112         req = tevent_req_create(mem_ctx, &state,
 113                                 struct wb_child_request_state);
 114         if (req == NULL) {
 115                 return NULL;
 116         }
 117
 118         state->ev = ev;
 119         state->child = child;
 120         state->request = request;
 121
 122         if (!tevent_queue_add(child->queue, ev, req,
 123                               wb_child_request_trigger, NULL)) {
 124                 tevent_req_nomem(NULL, req);
 125                 return tevent_req_post(req, ev);
 126         }
 127         return req;
 128 }
 129
 130 static void wb_child_request_trigger(struct tevent_req *req,
 131                                      void *private_data)
 132 {
 133         struct wb_child_request_state *state = tevent_req_data(
 134                 req, struct wb_child_request_state);
 135         struct tevent_req *subreq;
 136
 137         if ((state->child->pid == 0) && (!fork_domain_child(state->child))) {
 138                 tevent_req_error(req, errno);
 139                 return;
 140         }
 141
 142         subreq = wb_simple_trans_send(state, winbind_event_context(), NULL,
 143                                       state->child->sock, state->request);
 144         if (tevent_req_nomem(subreq, req)) {
 145                 return;
 146         }
 147         tevent_req_set_callback(subreq, wb_child_request_done, req);
 148
 149         if (!tevent_req_set_endtime(req, state->ev,
 150                                     timeval_current_ofs(300, 0))) {
 151                 tevent_req_nomem(NULL, req);
 152                 return;
 153         }
 154 }
 155
 156 static void wb_child_request_done(struct tevent_req *subreq)
 157 {
 158         struct tevent_req *req = tevent_req_callback_data(
 159                 subreq, struct tevent_req);
 160         struct wb_child_request_state *state = tevent_req_data(
 161                 req, struct wb_child_request_state);
 162         int ret, err;
 163
 164         ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
 165         TALLOC_FREE(subreq);
 166         if (ret == -1) {
 167                 tevent_req_error(req, err);
 168                 return;
 169         }
 170         tevent_req_done(req);
 171 }
 172
 173 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 174                           struct winbindd_response **presponse, int *err)
 175 {
 176         struct wb_child_request_state *state = tevent_req_data(
 177                 req, struct wb_child_request_state);
 178
 179         if (tevent_req_is_unix_error(req, err)) {
 180                 return -1;
 181         }
 182         *presponse = talloc_move(mem_ctx, &state->response);
 183         return 0;
 184 }
 185
 186 struct wb_domain_request_state {
 187         struct tevent_context *ev;
 188         struct winbindd_domain *domain;
 189         struct winbindd_request *request;
 190         struct winbindd_request *init_req;
 191         struct winbindd_response *response;
 192 };
 193
 194 static void wb_domain_request_gotdc(struct tevent_req *subreq);
 195 static void wb_domain_request_initialized(struct tevent_req *subreq);
 196 static void wb_domain_request_done(struct tevent_req *subreq);
 197
 198 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
 199                                           struct tevent_context *ev,
 200                                           struct winbindd_domain *domain,
 201                                           struct winbindd_request *request)
 202 {
 203         struct tevent_req *req, *subreq;
 204         struct wb_domain_request_state *state;
 205
 206         req = tevent_req_create(mem_ctx, &state,
 207                                 struct wb_domain_request_state);
 208         if (req == NULL) {
 209                 return NULL;
 210         }
 211
 212         if (domain->initialized) {
 213                 subreq = wb_child_request_send(state, ev, &domain->child,
 214                                                request);
 215                 if (tevent_req_nomem(subreq, req)) {
 216                         return tevent_req_post(req, ev);
 217                 }
 218                 tevent_req_set_callback(subreq, wb_domain_request_done, req);
 219                 return req;
 220         }
 221
 222         state->domain = domain;
 223         state->ev = ev;
 224         state->request = request;
 225
 226         state->init_req = talloc_zero(state, struct winbindd_request);
 227         if (tevent_req_nomem(state->init_req, req)) {
 228                 return tevent_req_post(req, ev);
 229         }
 230
 231         if (IS_DC || domain->primary || domain->internal) {
 232                 /* The primary domain has to find the DC name itself */
 233                 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 234                 fstrcpy(state->init_req->domain_name, domain->name);
 235                 state->init_req->data.init_conn.is_primary =
 236                         domain->primary ? true : false;
 237                 fstrcpy(state->init_req->data.init_conn.dcname, "");
 238
 239                 subreq = wb_child_request_send(state, ev, &domain->child,
 240                                                state->init_req);
 241                 if (tevent_req_nomem(subreq, req)) {
 242                         return tevent_req_post(req, ev);
 243                 }
 244                 tevent_req_set_callback(subreq, wb_domain_request_initialized,
 245                                         req);
 246                 return req;
 247         }
 248
 249         /*
 250          * Ask our DC for a DC name
 251          */
 252         domain = find_our_domain();
 253
 254         /* This is *not* the primary domain, let's ask our DC about a DC
 255          * name */
 256
 257         state->init_req->cmd = WINBINDD_GETDCNAME;
 258         fstrcpy(state->init_req->domain_name, domain->name);
 259
 260         subreq = wb_child_request_send(state, ev, &domain->child, request);
 261         if (tevent_req_nomem(subreq, req)) {
 262                 return tevent_req_post(req, ev);
 263         }
 264         tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
 265         return req;
 266 }
 267
 268 static void wb_domain_request_gotdc(struct tevent_req *subreq)
 269 {
 270         struct tevent_req *req = tevent_req_callback_data(
 271                 subreq, struct tevent_req);
 272         struct wb_domain_request_state *state = tevent_req_data(
 273                 req, struct wb_domain_request_state);
 274         struct winbindd_response *response;
 275         int ret, err;
 276
 277         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 278         TALLOC_FREE(subreq);
 279         if (ret == -1) {
 280                 tevent_req_error(req, err);
 281                 return;
 282         }
 283         state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 284         fstrcpy(state->init_req->domain_name, state->domain->name);
 285         state->init_req->data.init_conn.is_primary = False;
 286         fstrcpy(state->init_req->data.init_conn.dcname,
 287                 response->data.dc_name);
 288
 289         TALLOC_FREE(response);
 290
 291         subreq = wb_child_request_send(state, state->ev, &state->domain->child,
 292                                        state->init_req);
 293         if (tevent_req_nomem(subreq, req)) {
 294                 return;
 295         }
 296         tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
 297 }
 298
 299 static void wb_domain_request_initialized(struct tevent_req *subreq)
 300 {
 301         struct tevent_req *req = tevent_req_callback_data(
 302                 subreq, struct tevent_req);
 303         struct wb_domain_request_state *state = tevent_req_data(
 304                 req, struct wb_domain_request_state);
 305         struct winbindd_response *response;
 306         int ret, err;
 307
 308         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 309         TALLOC_FREE(subreq);
 310         if (ret == -1) {
 311                 tevent_req_error(req, err);
 312                 return;
 313         }
 314
 315         if (!string_to_sid(&state->domain->sid,
 316                            response->data.domain_info.sid)) {
 317                 DEBUG(1,("init_child_recv: Could not convert sid %s "
 318                         "from string\n", response->data.domain_info.sid));
 319                 tevent_req_error(req, EINVAL);
 320                 return;
 321         }
 322         fstrcpy(state->domain->name, response->data.domain_info.name);
 323         fstrcpy(state->domain->alt_name, response->data.domain_info.alt_name);
 324         state->domain->native_mode = response->data.domain_info.native_mode;
 325         state->domain->active_directory =
 326                 response->data.domain_info.active_directory;
 327         state->domain->initialized = true;
 328
 329         TALLOC_FREE(response);
 330
 331         subreq = wb_child_request_send(state, state->ev, &state->domain->child,
 332                                        state->request);
 333         if (tevent_req_nomem(subreq, req)) {
 334                 return;
 335         }
 336         tevent_req_set_callback(subreq, wb_domain_request_done, req);
 337 }
 338
 339 static void wb_domain_request_done(struct tevent_req *subreq)
 340 {
 341         struct tevent_req *req = tevent_req_callback_data(
 342                 subreq, struct tevent_req);
 343         struct wb_domain_request_state *state = tevent_req_data(
 344                 req, struct wb_domain_request_state);
 345         int ret, err;
 346
 347         ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
 348                                     &err);
 349         TALLOC_FREE(subreq);
 350         if (ret == -1) {
 351                 tevent_req_error(req, err);
 352                 return;
 353         }
 354         tevent_req_done(req);
 355 }
 356
 357 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 358                            struct winbindd_response **presponse, int *err)
 359 {
 360         struct wb_domain_request_state *state = tevent_req_data(
 361                 req, struct wb_domain_request_state);
 362
 363         if (tevent_req_is_unix_error(req, err)) {
 364                 return -1;
 365         }
 366         *presponse = talloc_move(mem_ctx, &state->response);
 367         return 0;
 368 }
 369
 370 /*
 371  * Machinery for async requests sent to children. You set up a
 372  * winbindd_request, select a child to query, and issue a async_request
 373  * call. When the request is completed, the callback function you specified is
 374  * called back with the private pointer you gave to async_request.
 375  */
 376
 377 struct winbindd_async_request {
 378         struct winbindd_async_request *next, *prev;
 379         TALLOC_CTX *mem_ctx;
 380         struct winbindd_child *child;
 381         struct winbindd_response *response;
 382         void (*continuation)(void *private_data, bool success);
 383         struct timed_event *reply_timeout_event;
 384         pid_t child_pid; /* pid of the child we're waiting on. Used to detect
 385                             a restart of the child (child->pid != child_pid). */
 386         void *private_data;
 387 };
 388
 389 static void async_request_done(struct tevent_req *req);
 390
 391 void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
 392                    struct winbindd_request *request,
 393                    struct winbindd_response *response,
 394                    void (*continuation)(void *private_data, bool success),
 395                    void *private_data)
 396 {
 397         struct winbindd_async_request *state;
 398         struct tevent_req *req;
 399
 400         DEBUG(10, ("Sending request to child pid %d (domain=%s)\n",
 401                    (int)child->pid,
 402                    (child->domain != NULL) ? child->domain->name : "''"));
 403
 404         state = talloc(mem_ctx, struct winbindd_async_request);
 405         if (state == NULL) {
 406                 DEBUG(0, ("talloc failed\n"));
 407                 continuation(private_data, False);
 408                 return;
 409         }
 410
 411         state->mem_ctx = mem_ctx;
 412         state->child = child;
 413         state->reply_timeout_event = NULL;
 414         state->response = response;
 415         state->continuation = continuation;
 416         state->private_data = private_data;
 417
 418         request->pid = child->pid;
 419
 420         req = wb_child_request_send(state, winbind_event_context(),
 421                                            child, request);
 422         if (req == NULL) {
 423                 DEBUG(0, ("wb_child_request_send failed\n"));
 424                 continuation(private_data, false);
 425                 return;
 426         }
 427         tevent_req_set_callback(req, async_request_done, state);
 428 }
 429
 430 static void async_request_done(struct tevent_req *req)
 431 {
 432         struct winbindd_async_request *state = tevent_req_callback_data(
 433                 req, struct winbindd_async_request);
 434         struct winbindd_response *response;
 435         int ret, err;
 436
 437         ret = wb_child_request_recv(req, state, &response, &err);
 438         TALLOC_FREE(req);
 439         if (ret == -1) {
 440                 DEBUG(2, ("wb_child_request_recv failed: %s\n",
 441                           strerror(err)));
 442                 state->continuation(state->private_data, false);
 443                 return;
 444         }
 445         *state->response = *response;
 446         state->continuation(state->private_data, true);
 447 }
 448
 449 struct domain_request_state {
 450         struct winbindd_domain *domain;
 451         struct winbindd_request *request;
 452         struct winbindd_response *response;
 453         void (*continuation)(void *private_data_data, bool success);
 454         void *private_data_data;
 455 };
 456
 457 static void async_domain_request_done(struct tevent_req *req);
 458
 459 void async_domain_request(TALLOC_CTX *mem_ctx,
 460                           struct winbindd_domain *domain,
 461                           struct winbindd_request *request,
 462                           struct winbindd_response *response,
 463                           void (*continuation)(void *private_data_data, bool success),
 464                           void *private_data_data)
 465 {
 466         struct tevent_req *subreq;
 467         struct domain_request_state *state;
 468
 469         state = TALLOC_P(mem_ctx, struct domain_request_state);
 470         if (state == NULL) {
 471                 DEBUG(0, ("talloc failed\n"));
 472                 continuation(private_data_data, False);
 473                 return;
 474         }
 475
 476         state->domain = domain;
 477         state->request = request;
 478         state->response = response;
 479         state->continuation = continuation;
 480         state->private_data_data = private_data_data;
 481
 482         subreq = wb_domain_request_send(state, winbind_event_context(),
 483                                         domain, request);
 484         if (subreq == NULL) {
 485                 DEBUG(5, ("wb_domain_request_send failed\n"));
 486                 continuation(private_data_data, false);
 487                 return;
 488         }
 489         tevent_req_set_callback(subreq, async_domain_request_done, state);
 490 }
 491
 492 static void async_domain_request_done(struct tevent_req *req)
 493 {
 494         struct domain_request_state *state = tevent_req_callback_data(
 495                 req, struct domain_request_state);
 496         struct winbindd_response *response;
 497         int ret, err;
 498
 499         ret = wb_domain_request_recv(req, state, &response, &err);
 500         TALLOC_FREE(req);
 501         if (ret == -1) {
 502                 DEBUG(5, ("wb_domain_request returned %s\n", strerror(err)));
 503                 state->continuation(state->private_data_data, false);
 504                 return;
 505         }
 506         *(state->response) = *response;
 507         state->continuation(state->private_data_data, true);
 508 }
 509
 510 static void recvfrom_child(void *private_data_data, bool success)
 511 {
 512         struct winbindd_cli_state *state =
 513                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 514         enum winbindd_result result = state->response->result;
 515
 516         /* This is an optimization: The child has written directly to the
 517          * response buffer. The request itself is still in pending state,
 518          * state that in the result code. */
 519
 520         state->response->result = WINBINDD_PENDING;
 521
 522         if ((!success) || (result != WINBINDD_OK)) {
 523                 request_error(state);
 524                 return;
 525         }
 526
 527         request_ok(state);
 528 }
 529
 530 void sendto_domain(struct winbindd_cli_state *state,
 531                    struct winbindd_domain *domain)
 532 {
 533         async_domain_request(state->mem_ctx, domain,
 534                              state->request, state->response,
 535                              recvfrom_child, state);
 536 }
 537
 538 static void child_process_request(struct winbindd_child *child,
 539                                   struct winbindd_cli_state *state)
 540 {
 541         struct winbindd_domain *domain = child->domain;
 542         const struct winbindd_child_dispatch_table *table = child->table;
 543
 544         /* Free response data - we may be interrupted and receive another
 545            command before being able to send this data off. */
 546
 547         state->response->result = WINBINDD_ERROR;
 548         state->response->length = sizeof(struct winbindd_response);
 549
 550         /* as all requests in the child are sync, we can use talloc_tos() */
 551         state->mem_ctx = talloc_tos();
 552
 553         /* Process command */
 554
 555         for (; table->name; table++) {
 556                 if (state->request->cmd == table->struct_cmd) {
 557                         DEBUG(10,("child_process_request: request fn %s\n",
 558                                   table->name));
 559                         state->response->result = table->struct_fn(domain, state);
 560                         return;
 561                 }
 562         }
 563
 564         DEBUG(1 ,("child_process_request: unknown request fn number %d\n",
 565                   (int)state->request->cmd));
 566         state->response->result = WINBINDD_ERROR;
 567 }
 568
 569 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 570                  const struct winbindd_child_dispatch_table *table,
 571                  const char *logprefix,
 572                  const char *logname)
 573 {
 574         if (logprefix && logname) {
 575                 if (asprintf(&child->logfilename, "%s/%s-%s",
 576                              get_dyn_LOGFILEBASE(), logprefix, logname) < 0) {
 577                         smb_panic("Internal error: asprintf failed");
 578                 }
 579         } else {
 580                 smb_panic("Internal error: logprefix == NULL && "
 581                           "logname == NULL");
 582         }
 583
 584         child->domain = NULL;
 585         child->table = table;
 586         child->queue = tevent_queue_create(NULL, "winbind_child");
 587         SMB_ASSERT(child->queue != NULL);
 588         child->rpccli = wbint_rpccli_create(NULL, domain, child);
 589         SMB_ASSERT(child->rpccli != NULL);
 590 }
 591
 592 struct winbindd_child *children = NULL;
 593
 594 void winbind_child_died(pid_t pid)
 595 {
 596         struct winbindd_child *child;
 597
 598         for (child = children; child != NULL; child = child->next) {
 599                 if (child->pid == pid) {
 600                         break;
 601                 }
 602         }
 603
 604         if (child == NULL) {
 605                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 606                 return;
 607         }
 608
 609         /* This will be re-added in fork_domain_child() */
 610
 611         DLIST_REMOVE(children, child);
 612
 613         close(child->sock);
 614         child->sock = -1;
 615         child->pid = 0;
 616 }
 617
 618 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 619
 620 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 621 {
 622         flush_negative_conn_cache_for_domain(domain->name);
 623         if (*domain->alt_name) {
 624                 flush_negative_conn_cache_for_domain(domain->alt_name);
 625         }
 626 }
 627
 628 /*
 629  * Parent winbindd process sets its own debug level first and then
 630  * sends a message to all the winbindd children to adjust their debug
 631  * level to that of parents.
 632  */
 633
 634 void winbind_msg_debug(struct messaging_context *msg_ctx,
 635                          void *private_data,
 636                          uint32_t msg_type,
 637                          struct server_id server_id,
 638                          DATA_BLOB *data)
 639 {
 640         struct winbindd_child *child;
 641
 642         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 643
 644         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 645
 646         for (child = children; child != NULL; child = child->next) {
 647
 648                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 649                         (unsigned int)child->pid));
 650
 651                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 652                            MSG_DEBUG,
 653                            data->data,
 654                            strlen((char *) data->data) + 1);
 655         }
 656 }
 657
 658 /* Set our domains as offline and forward the offline message to our children. */
 659
 660 void winbind_msg_offline(struct messaging_context *msg_ctx,
 661                          void *private_data,
 662                          uint32_t msg_type,
 663                          struct server_id server_id,
 664                          DATA_BLOB *data)
 665 {
 666         struct winbindd_child *child;
 667         struct winbindd_domain *domain;
 668
 669         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 670
 671         if (!lp_winbind_offline_logon()) {
 672                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 673                 return;
 674         }
 675
 676         /* Set our global state as offline. */
 677         if (!set_global_winbindd_state_offline()) {
 678                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 679                 return;
 680         }
 681
 682         /* Set all our domains as offline. */
 683         for (domain = domain_list(); domain; domain = domain->next) {
 684                 if (domain->internal) {
 685                         continue;
 686                 }
 687                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 688                 set_domain_offline(domain);
 689         }
 690
 691         for (child = children; child != NULL; child = child->next) {
 692                 /* Don't send message to internal childs.  We've already
 693                    done so above. */
 694                 if (!child->domain || winbindd_internal_child(child)) {
 695                         continue;
 696                 }
 697
 698                 /* Or internal domains (this should not be possible....) */
 699                 if (child->domain->internal) {
 700                         continue;
 701                 }
 702
 703                 /* Each winbindd child should only process requests for one domain - make sure
 704                    we only set it online / offline for that domain. */
 705
 706                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 707                         (unsigned int)child->pid, domain->name ));
 708
 709                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 710                                    MSG_WINBIND_OFFLINE,
 711                                    (uint8 *)child->domain->name,
 712                                    strlen(child->domain->name)+1);
 713         }
 714 }
 715
 716 /* Set our domains as online and forward the online message to our children. */
 717
 718 void winbind_msg_online(struct messaging_context *msg_ctx,
 719                         void *private_data,
 720                         uint32_t msg_type,
 721                         struct server_id server_id,
 722                         DATA_BLOB *data)
 723 {
 724         struct winbindd_child *child;
 725         struct winbindd_domain *domain;
 726
 727         DEBUG(10,("winbind_msg_online: got online message.\n"));
 728
 729         if (!lp_winbind_offline_logon()) {
 730                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 731                 return;
 732         }
 733
 734         /* Set our global state as online. */
 735         set_global_winbindd_state_online();
 736
 737         smb_nscd_flush_user_cache();
 738         smb_nscd_flush_group_cache();
 739
 740         /* Set all our domains as online. */
 741         for (domain = domain_list(); domain; domain = domain->next) {
 742                 if (domain->internal) {
 743                         continue;
 744                 }
 745                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 746
 747                 winbindd_flush_negative_conn_cache(domain);
 748                 set_domain_online_request(domain);
 749
 750                 /* Send an online message to the idmap child when our
 751                    primary domain comes back online */
 752
 753                 if ( domain->primary ) {
 754                         struct winbindd_child *idmap = idmap_child();
 755
 756                         if ( idmap->pid != 0 ) {
 757                                 messaging_send_buf(msg_ctx,
 758                                                    pid_to_procid(idmap->pid),
 759                                                    MSG_WINBIND_ONLINE,
 760                                                    (uint8 *)domain->name,
 761                                                    strlen(domain->name)+1);
 762                         }
 763                 }
 764         }
 765
 766         for (child = children; child != NULL; child = child->next) {
 767                 /* Don't send message to internal childs. */
 768                 if (!child->domain || winbindd_internal_child(child)) {
 769                         continue;
 770                 }
 771
 772                 /* Or internal domains (this should not be possible....) */
 773                 if (child->domain->internal) {
 774                         continue;
 775                 }
 776
 777                 /* Each winbindd child should only process requests for one domain - make sure
 778                    we only set it online / offline for that domain. */
 779
 780                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 781                         (unsigned int)child->pid, child->domain->name ));
 782
 783                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 784                                    MSG_WINBIND_ONLINE,
 785                                    (uint8 *)child->domain->name,
 786                                    strlen(child->domain->name)+1);
 787         }
 788 }
 789
 790 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 791 {
 792         struct winbindd_domain *domain;
 793         char *buf = NULL;
 794
 795         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 796                                    get_global_winbindd_state_offline() ?
 797                                    "Offline":"Online")) == NULL) {
 798                 return NULL;
 799         }
 800
 801         for (domain = domain_list(); domain; domain = domain->next) {
 802                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 803                                                   domain->name,
 804                                                   domain->online ?
 805                                                   "Online":"Offline")) == NULL) {
 806                         return NULL;
 807                 }
 808         }
 809
 810         buf = talloc_asprintf_append_buffer(buf, "\n");
 811
 812         DEBUG(5,("collect_onlinestatus: %s", buf));
 813
 814         return buf;
 815 }
 816
 817 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 818                               void *private_data,
 819                               uint32_t msg_type,
 820                               struct server_id server_id,
 821                               DATA_BLOB *data)
 822 {
 823         TALLOC_CTX *mem_ctx;
 824         const char *message;
 825         struct server_id *sender;
 826
 827         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 828
 829         if (!data->data) {
 830                 return;
 831         }
 832
 833         sender = (struct server_id *)data->data;
 834
 835         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 836         if (mem_ctx == NULL) {
 837                 return;
 838         }
 839
 840         message = collect_onlinestatus(mem_ctx);
 841         if (message == NULL) {
 842                 talloc_destroy(mem_ctx);
 843                 return;
 844         }
 845
 846         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 847                            (uint8 *)message, strlen(message) + 1);
 848
 849         talloc_destroy(mem_ctx);
 850 }
 851
 852 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 853                                  void *private_data,
 854                                  uint32_t msg_type,
 855                                  struct server_id server_id,
 856                                  DATA_BLOB *data)
 857 {
 858         struct winbindd_child *child;
 859
 860         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 861
 862         dump_event_list(winbind_event_context());
 863
 864         for (child = children; child != NULL; child = child->next) {
 865
 866                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 867                         (unsigned int)child->pid));
 868
 869                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 870                                    MSG_DUMP_EVENT_LIST,
 871                                    NULL, 0);
 872         }
 873
 874 }
 875
 876 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 877                                   void *private_data,
 878                                   uint32_t msg_type,
 879                                   struct server_id server_id,
 880                                   DATA_BLOB *data)
 881 {
 882         TALLOC_CTX *mem_ctx;
 883         const char *message = NULL;
 884         struct server_id *sender = NULL;
 885         const char *domain = NULL;
 886         char *s = NULL;
 887         NTSTATUS status;
 888         struct winbindd_domain *dom = NULL;
 889
 890         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 891
 892         if (!data || !data->data) {
 893                 return;
 894         }
 895
 896         if (data->length < sizeof(struct server_id)) {
 897                 return;
 898         }
 899
 900         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 901         if (!mem_ctx) {
 902                 return;
 903         }
 904
 905         sender = (struct server_id *)data->data;
 906         if (data->length > sizeof(struct server_id)) {
 907                 domain = (const char *)data->data+sizeof(struct server_id);
 908         }
 909
 910         if (domain) {
 911
 912                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 913                         domain));
 914
 915                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 916                                                   find_domain_from_name_noinit(domain));
 917                 if (!message) {
 918                         talloc_destroy(mem_ctx);
 919                         return;
 920                 }
 921
 922                 messaging_send_buf(msg_ctx, *sender,
 923                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 924                                    (uint8_t *)message, strlen(message) + 1);
 925
 926                 talloc_destroy(mem_ctx);
 927
 928                 return;
 929         }
 930
 931         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 932
 933         for (dom = domain_list(); dom; dom=dom->next) {
 934                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 935                 if (!message) {
 936                         talloc_destroy(mem_ctx);
 937                         return;
 938                 }
 939
 940                 s = talloc_asprintf_append(s, "%s\n", message);
 941                 if (!s) {
 942                         talloc_destroy(mem_ctx);
 943                         return;
 944                 }
 945         }
 946
 947         status = messaging_send_buf(msg_ctx, *sender,
 948                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 949                                     (uint8_t *)s, strlen(s) + 1);
 950         if (!NT_STATUS_IS_OK(status)) {
 951                 DEBUG(0,("failed to send message: %s\n",
 952                 nt_errstr(status)));
 953         }
 954
 955         talloc_destroy(mem_ctx);
 956 }
 957
 958 static void account_lockout_policy_handler(struct event_context *ctx,
 959                                            struct timed_event *te,
 960                                            struct timeval now,
 961                                            void *private_data)
 962 {
 963         struct winbindd_child *child =
 964                 (struct winbindd_child *)private_data;
 965         TALLOC_CTX *mem_ctx = NULL;
 966         struct winbindd_methods *methods;
 967         struct samr_DomInfo12 lockout_policy;
 968         NTSTATUS result;
 969
 970         DEBUG(10,("account_lockout_policy_handler called\n"));
 971
 972         TALLOC_FREE(child->lockout_policy_event);
 973
 974         if ( !winbindd_can_contact_domain( child->domain ) ) {
 975                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 976                           "do not have an incoming trust to domain %s\n",
 977                           child->domain->name));
 978
 979                 return;
 980         }
 981
 982         methods = child->domain->methods;
 983
 984         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 985         if (!mem_ctx) {
 986                 result = NT_STATUS_NO_MEMORY;
 987         } else {
 988                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 989         }
 990         TALLOC_FREE(mem_ctx);
 991
 992         if (!NT_STATUS_IS_OK(result)) {
 993                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 994                          nt_errstr(result)));
 995         }
 996
 997         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 998                                                       timeval_current_ofs(3600, 0),
 999                                                       account_lockout_policy_handler,
1000                                                       child);
1001 }
1002
1003 static time_t get_machine_password_timeout(void)
1004 {
1005         /* until we have gpo support use lp setting */
1006         return lp_machine_password_timeout();
1007 }
1008
1009 static bool calculate_next_machine_pwd_change(const char *domain,
1010                                               struct timeval *t)
1011 {
1012         time_t pass_last_set_time;
1013         time_t timeout;
1014         time_t next_change;
1015         struct timeval tv;
1016         char *pw;
1017
1018         pw = secrets_fetch_machine_password(domain,
1019                                             &pass_last_set_time,
1020                                             NULL);
1021
1022         if (pw == NULL) {
1023                 DEBUG(0,("cannot fetch own machine password ????"));
1024                 return false;
1025         }
1026
1027         SAFE_FREE(pw);
1028
1029         timeout = get_machine_password_timeout();
1030         if (timeout == 0) {
1031                 DEBUG(10,("machine password never expires\n"));
1032                 return false;
1033         }
1034
1035         tv.tv_sec = pass_last_set_time;
1036         DEBUG(10, ("password last changed %s\n",
1037                    timeval_string(talloc_tos(), &tv, false)));
1038         tv.tv_sec += timeout;
1039         DEBUGADD(10, ("password valid until %s\n",
1040                       timeval_string(talloc_tos(), &tv, false)));
1041
1042         if (time(NULL) < (pass_last_set_time + timeout)) {
1043                 next_change = pass_last_set_time + timeout;
1044                 DEBUG(10,("machine password still valid until: %s\n",
1045                         http_timestring(talloc_tos(), next_change)));
1046                 *t = timeval_set(next_change, 0);
1047
1048                 if (lp_clustering()) {
1049                         uint8_t randbuf;
1050                         /*
1051                          * When having a cluster, we have several
1052                          * winbinds racing for the password change. In
1053                          * the machine_password_change_handler()
1054                          * function we check if someone else was
1055                          * faster when the event triggers. We add a
1056                          * 255-second random delay here, so that we
1057                          * don't run to change the password at the
1058                          * exact same moment.
1059                          */
1060                         generate_random_buffer(&randbuf, sizeof(randbuf));
1061                         DEBUG(10, ("adding %d seconds randomness\n",
1062                                    (int)randbuf));
1063                         t->tv_sec += randbuf;
1064                 }
1065                 return true;
1066         }
1067
1068         DEBUG(10,("machine password expired, needs immediate change\n"));
1069
1070         *t = timeval_zero();
1071
1072         return true;
1073 }
1074
1075 static void machine_password_change_handler(struct event_context *ctx,
1076                                             struct timed_event *te,
1077                                             struct timeval now,
1078                                             void *private_data)
1079 {
1080         struct winbindd_child *child =
1081                 (struct winbindd_child *)private_data;
1082         struct rpc_pipe_client *netlogon_pipe = NULL;
1083         TALLOC_CTX *frame;
1084         NTSTATUS result;
1085         struct timeval next_change;
1086
1087         DEBUG(10,("machine_password_change_handler called\n"));
1088
1089         TALLOC_FREE(child->machine_password_change_event);
1090
1091         if (!calculate_next_machine_pwd_change(child->domain->name,
1092                                                &next_change)) {
1093                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1094                 return;
1095         }
1096
1097         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1098                    timeval_string(talloc_tos(), &next_change, false)));
1099
1100         if (!timeval_expired(&next_change)) {
1101                 DEBUG(10, ("Someone else has already changed the pw\n"));
1102                 goto done;
1103         }
1104
1105         if (!winbindd_can_contact_domain(child->domain)) {
1106                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
1107                           "do not have an incoming trust to domain %s\n",
1108                           child->domain->name));
1109                 return;
1110         }
1111
1112         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
1113         if (!NT_STATUS_IS_OK(result)) {
1114                 DEBUG(10,("machine_password_change_handler: "
1115                         "failed to connect netlogon pipe: %s\n",
1116                          nt_errstr(result)));
1117                 return;
1118         }
1119
1120         frame = talloc_stackframe();
1121
1122         result = trust_pw_find_change_and_store_it(netlogon_pipe,
1123                                                    frame,
1124                                                    child->domain->name);
1125         TALLOC_FREE(frame);
1126
1127         DEBUG(10, ("machine_password_change_handler: "
1128                    "trust_pw_find_change_and_store_it returned %s\n",
1129                    nt_errstr(result)));
1130
1131         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
1132                 DEBUG(3,("machine_password_change_handler: password set returned "
1133                          "ACCESS_DENIED.  Maybe the trust account "
1134                          "password was changed and we didn't know it. "
1135                          "Killing connections to domain %s\n",
1136                          child->domain->name));
1137                 TALLOC_FREE(child->domain->conn.netlogon_pipe);
1138         }
1139
1140         if (!calculate_next_machine_pwd_change(child->domain->name,
1141                                                &next_change)) {
1142                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1143                 return;
1144         }
1145
1146         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1147                    timeval_string(talloc_tos(), &next_change, false)));
1148
1149         if (!NT_STATUS_IS_OK(result)) {
1150                 struct timeval tmp;
1151                 /*
1152                  * In case of failure, give the DC a minute to recover
1153                  */
1154                 tmp = timeval_current_ofs(60, 0);
1155                 next_change = timeval_max(&next_change, &tmp);
1156         }
1157
1158 done:
1159         child->machine_password_change_event = event_add_timed(winbind_event_context(), NULL,
1160                                                               next_change,
1161                                                               machine_password_change_handler,
1162                                                               child);
1163 }
1164
1165 /* Deal with a request to go offline. */
1166
1167 static void child_msg_offline(struct messaging_context *msg,
1168                               void *private_data,
1169                               uint32_t msg_type,
1170                               struct server_id server_id,
1171                               DATA_BLOB *data)
1172 {
1173         struct winbindd_domain *domain;
1174         struct winbindd_domain *primary_domain = NULL;
1175         const char *domainname = (const char *)data->data;
1176
1177         if (data->data == NULL || data->length == 0) {
1178                 return;
1179         }
1180
1181         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1182
1183         if (!lp_winbind_offline_logon()) {
1184                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1185                 return;
1186         }
1187
1188         primary_domain = find_our_domain();
1189
1190         /* Mark the requested domain offline. */
1191
1192         for (domain = domain_list(); domain; domain = domain->next) {
1193                 if (domain->internal) {
1194                         continue;
1195                 }
1196                 if (strequal(domain->name, domainname)) {
1197                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1198                         set_domain_offline(domain);
1199                         /* we are in the trusted domain, set the primary domain
1200                          * offline too */
1201                         if (domain != primary_domain) {
1202                                 set_domain_offline(primary_domain);
1203                         }
1204                 }
1205         }
1206 }
1207
1208 /* Deal with a request to go online. */
1209
1210 static void child_msg_online(struct messaging_context *msg,
1211                              void *private_data,
1212                              uint32_t msg_type,
1213                              struct server_id server_id,
1214                              DATA_BLOB *data)
1215 {
1216         struct winbindd_domain *domain;
1217         struct winbindd_domain *primary_domain = NULL;
1218         const char *domainname = (const char *)data->data;
1219
1220         if (data->data == NULL || data->length == 0) {
1221                 return;
1222         }
1223
1224         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1225
1226         if (!lp_winbind_offline_logon()) {
1227                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1228                 return;
1229         }
1230
1231         primary_domain = find_our_domain();
1232
1233         /* Set our global state as online. */
1234         set_global_winbindd_state_online();
1235
1236         /* Try and mark everything online - delete any negative cache entries
1237            to force a reconnect now. */
1238
1239         for (domain = domain_list(); domain; domain = domain->next) {
1240                 if (domain->internal) {
1241                         continue;
1242                 }
1243                 if (strequal(domain->name, domainname)) {
1244                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1245                         winbindd_flush_negative_conn_cache(domain);
1246                         set_domain_online_request(domain);
1247
1248                         /* we can be in trusted domain, which will contact primary domain
1249                          * we have to bring primary domain online in trusted domain process
1250                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1251                          * --> contact_domain = find_our_domain()
1252                          * */
1253                         if (domain != primary_domain) {
1254                                 winbindd_flush_negative_conn_cache(primary_domain);
1255                                 set_domain_online_request(primary_domain);
1256                         }
1257                 }
1258         }
1259 }
1260
1261 static void child_msg_dump_event_list(struct messaging_context *msg,
1262                                       void *private_data,
1263                                       uint32_t msg_type,
1264                                       struct server_id server_id,
1265                                       DATA_BLOB *data)
1266 {
1267         DEBUG(5,("child_msg_dump_event_list received\n"));
1268
1269         dump_event_list(winbind_event_context());
1270 }
1271
1272 bool winbindd_reinit_after_fork(const char *logfilename)
1273 {
1274         struct winbindd_domain *domain;
1275         struct winbindd_child *cl;
1276
1277         if (!NT_STATUS_IS_OK(reinit_after_fork(winbind_messaging_context(),
1278                                                winbind_event_context(),
1279                                                true))) {
1280                 DEBUG(0,("reinit_after_fork() failed\n"));
1281                 return false;
1282         }
1283
1284         close_conns_after_fork();
1285
1286         if (!override_logfile && logfilename) {
1287                 lp_set_logfile(logfilename);
1288                 reopen_logs();
1289         }
1290
1291         if (!winbindd_setup_sig_term_handler(false))
1292                 return false;
1293         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1294                                             logfilename))
1295                 return false;
1296
1297         /* Don't handle the same messages as our parent. */
1298         messaging_deregister(winbind_messaging_context(),
1299                              MSG_SMB_CONF_UPDATED, NULL);
1300         messaging_deregister(winbind_messaging_context(),
1301                              MSG_SHUTDOWN, NULL);
1302         messaging_deregister(winbind_messaging_context(),
1303                              MSG_WINBIND_OFFLINE, NULL);
1304         messaging_deregister(winbind_messaging_context(),
1305                              MSG_WINBIND_ONLINE, NULL);
1306         messaging_deregister(winbind_messaging_context(),
1307                              MSG_WINBIND_ONLINESTATUS, NULL);
1308         messaging_deregister(winbind_messaging_context(),
1309                              MSG_DUMP_EVENT_LIST, NULL);
1310         messaging_deregister(winbind_messaging_context(),
1311                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1312         messaging_deregister(winbind_messaging_context(),
1313                              MSG_DEBUG, NULL);
1314
1315         /* We have destroyed all events in the winbindd_event_context
1316          * in reinit_after_fork(), so clean out all possible pending
1317          * event pointers. */
1318
1319         /* Deal with check_online_events. */
1320
1321         for (domain = domain_list(); domain; domain = domain->next) {
1322                 TALLOC_FREE(domain->check_online_event);
1323         }
1324
1325         /* Ensure we're not handling a credential cache event inherited
1326          * from our parent. */
1327
1328         ccache_remove_all_after_fork();
1329
1330         /* Destroy all possible events in child list. */
1331         for (cl = children; cl != NULL; cl = cl->next) {
1332                 TALLOC_FREE(cl->lockout_policy_event);
1333                 TALLOC_FREE(cl->machine_password_change_event);
1334
1335                 /* Children should never be able to send
1336                  * each other messages, all messages must
1337                  * go through the parent.
1338                  */
1339                 cl->pid = (pid_t)0;
1340         }
1341         /*
1342          * This is a little tricky, children must not
1343          * send an MSG_WINBIND_ONLINE message to idmap_child().
1344          * If we are in a child of our primary domain or
1345          * in the process created by fork_child_dc_connect(),
1346          * and the primary domain cannot go online,
1347          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1348          * periodically to idmap_child().
1349          *
1350          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1351          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1352          * ---> init_dc_connection() ---> cm_open_connection --->
1353          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1354          * idmap_child(). Disallow children sending messages
1355          * to each other, all messages must go through the parent.
1356          */
1357         cl = idmap_child();
1358         cl->pid = (pid_t)0;
1359
1360         return true;
1361 }
1362
1363 /*
1364  * In a child there will be only one domain, reference that here.
1365  */
1366 static struct winbindd_domain *child_domain;
1367
1368 struct winbindd_domain *wb_child_domain(void)
1369 {
1370         return child_domain;
1371 }
1372
1373 static bool fork_domain_child(struct winbindd_child *child)
1374 {
1375         int fdpair[2];
1376         struct winbindd_cli_state state;
1377         struct winbindd_request request;
1378         struct winbindd_response response;
1379         struct winbindd_domain *primary_domain = NULL;
1380
1381         if (child->domain) {
1382                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1383                            child->domain->name));
1384         } else {
1385                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1386         }
1387         child_domain = child->domain;
1388
1389         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1390                 DEBUG(0, ("Could not open child pipe: %s\n",
1391                           strerror(errno)));
1392                 return False;
1393         }
1394
1395         ZERO_STRUCT(state);
1396         state.pid = sys_getpid();
1397         state.request = &request;
1398         state.response = &response;
1399
1400         child->pid = sys_fork();
1401
1402         if (child->pid == -1) {
1403                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1404                 return False;
1405         }
1406
1407         if (child->pid != 0) {
1408                 /* Parent */
1409                 close(fdpair[0]);
1410                 child->next = child->prev = NULL;
1411                 DLIST_ADD(children, child);
1412                 child->sock = fdpair[1];
1413                 return True;
1414         }
1415
1416         /* Child */
1417
1418         DEBUG(10, ("Child process %d\n", (int)sys_getpid()));
1419
1420         /* Stop zombies in children */
1421         CatchChild();
1422
1423         state.sock = fdpair[0];
1424         close(fdpair[1]);
1425
1426         if (!winbindd_reinit_after_fork(child->logfilename)) {
1427                 _exit(0);
1428         }
1429
1430         /* Handle online/offline messages. */
1431         messaging_register(winbind_messaging_context(), NULL,
1432                            MSG_WINBIND_OFFLINE, child_msg_offline);
1433         messaging_register(winbind_messaging_context(), NULL,
1434                            MSG_WINBIND_ONLINE, child_msg_online);
1435         messaging_register(winbind_messaging_context(), NULL,
1436                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1437         messaging_register(winbind_messaging_context(), NULL,
1438                            MSG_DEBUG, debug_message);
1439
1440         primary_domain = find_our_domain();
1441
1442         if (primary_domain == NULL) {
1443                 smb_panic("no primary domain found");
1444         }
1445
1446         /* It doesn't matter if we allow cache login,
1447          * try to bring domain online after fork. */
1448         if ( child->domain ) {
1449                 child->domain->startup = True;
1450                 child->domain->startup_time = time(NULL);
1451                 /* we can be in primary domain or in trusted domain
1452                  * If we are in trusted domain, set the primary domain
1453                  * in start-up mode */
1454                 if (!(child->domain->internal)) {
1455                         set_domain_online_request(child->domain);
1456                         if (!(child->domain->primary)) {
1457                                 primary_domain->startup = True;
1458                                 primary_domain->startup_time = time(NULL);
1459                                 set_domain_online_request(primary_domain);
1460                         }
1461                 }
1462         }
1463
1464         /*
1465          * We are in idmap child, make sure that we set the
1466          * check_online_event to bring primary domain online.
1467          */
1468         if (child == idmap_child()) {
1469                 set_domain_online_request(primary_domain);
1470         }
1471
1472         /* We might be in the idmap child...*/
1473         if (child->domain && !(child->domain->internal) &&
1474             lp_winbind_offline_logon()) {
1475
1476                 set_domain_online_request(child->domain);
1477
1478                 if (primary_domain && (primary_domain != child->domain)) {
1479                         /* We need to talk to the primary
1480                          * domain as well as the trusted
1481                          * domain inside a trusted domain
1482                          * child.
1483                          * See the code in :
1484                          * set_dc_type_and_flags_trustinfo()
1485                          * for details.
1486                          */
1487                         set_domain_online_request(primary_domain);
1488                 }
1489
1490                 child->lockout_policy_event = event_add_timed(
1491                         winbind_event_context(), NULL, timeval_zero(),
1492                         account_lockout_policy_handler,
1493                         child);
1494         }
1495
1496         if (child->domain && child->domain->primary &&
1497             !USE_KERBEROS_KEYTAB &&
1498             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1499
1500                 struct timeval next_change;
1501
1502                 if (calculate_next_machine_pwd_change(child->domain->name,
1503                                                        &next_change)) {
1504                         child->machine_password_change_event = event_add_timed(
1505                                 winbind_event_context(), NULL, next_change,
1506                                 machine_password_change_handler,
1507                                 child);
1508                 }
1509         }
1510
1511         while (1) {
1512
1513                 int ret;
1514                 fd_set r_fds;
1515                 fd_set w_fds;
1516                 int maxfd;
1517                 struct timeval t;
1518                 struct timeval *tp;
1519                 struct timeval now;
1520                 TALLOC_CTX *frame = talloc_stackframe();
1521                 struct iovec iov[2];
1522                 int iov_count;
1523                 NTSTATUS status;
1524
1525                 if (run_events(winbind_event_context(), 0, NULL, NULL)) {
1526                         TALLOC_FREE(frame);
1527                         continue;
1528                 }
1529
1530                 GetTimeOfDay(&now);
1531
1532                 if (child->domain && child->domain->startup &&
1533                                 (now.tv_sec > child->domain->startup_time + 30)) {
1534                         /* No longer in "startup" mode. */
1535                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1536                                 child->domain->name ));
1537                         child->domain->startup = False;
1538                 }
1539
1540                 FD_ZERO(&r_fds);
1541                 FD_ZERO(&w_fds);
1542                 FD_SET(state.sock, &r_fds);
1543                 maxfd = state.sock;
1544
1545                 event_add_to_select_args(winbind_event_context(), &now,
1546                                          &r_fds, &w_fds, &t, &maxfd);
1547                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1548                 if (tp) {
1549                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1550                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1551                 }
1552
1553                 ret = sys_select(maxfd + 1, &r_fds, &w_fds, NULL, tp);
1554
1555                 if (run_events(winbind_event_context(), ret, &r_fds, &w_fds)) {
1556                         /* We got a signal - continue. */
1557                         TALLOC_FREE(frame);
1558                         continue;
1559                 }
1560
1561                 if (ret == 0) {
1562                         DEBUG(11,("nothing is ready yet, continue\n"));
1563                         TALLOC_FREE(frame);
1564                         continue;
1565                 }
1566
1567                 if (ret == -1 && errno == EINTR) {
1568                         /* We got a signal - continue. */
1569                         TALLOC_FREE(frame);
1570                         continue;
1571                 }
1572
1573                 if (ret == -1 && errno != EINTR) {
1574                         DEBUG(0,("select error occured\n"));
1575                         TALLOC_FREE(frame);
1576                         perror("select");
1577                         _exit(1);
1578                 }
1579
1580                 /* fetch a request from the main daemon */
1581                 status = child_read_request(&state);
1582
1583                 if (!NT_STATUS_IS_OK(status)) {
1584                         /* we lost contact with our parent */
1585                         _exit(0);
1586                 }
1587
1588                 DEBUG(4,("child daemon request %d\n", (int)state.request->cmd));
1589
1590                 ZERO_STRUCTP(state.response);
1591                 state.request->null_term = '\0';
1592                 state.mem_ctx = frame;
1593                 child_process_request(child, &state);
1594
1595                 DEBUG(4, ("Finished processing child request %d\n",
1596                           (int)state.request->cmd));
1597
1598                 SAFE_FREE(state.request->extra_data.data);
1599
1600                 iov[0].iov_base = (void *)state.response;
1601                 iov[0].iov_len = sizeof(struct winbindd_response);
1602                 iov_count = 1;
1603
1604                 if (state.response->length > sizeof(struct winbindd_response)) {
1605                         iov[1].iov_base =
1606                                 (void *)state.response->extra_data.data;
1607                         iov[1].iov_len = state.response->length-iov[0].iov_len;
1608                         iov_count = 2;
1609                 }
1610
1611                 DEBUG(10, ("Writing %d bytes to parent\n",
1612                            (int)state.response->length));
1613
1614                 if (write_data_iov(state.sock, iov, iov_count) !=
1615                     state.response->length) {
1616                         DEBUG(0, ("Could not write result\n"));
1617                         exit(1);
1618                 }
1619                 TALLOC_FREE(frame);
1620         }
1621 }