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 "rpc_client/rpc_client.h"
  33 #include "nsswitch/wb_reqtrans.h"
  34 #include "secrets.h"
  35 #include "../lib/util/select.h"
  36 #include "../libcli/security/security.h"
  37 #include "system/select.h"
  38 #include "messages.h"
  39 #include "../lib/util/tevent_unix.h"
  40 #include "lib/param/loadparm.h"
  41 #include "lib/sys_rw.h"
  42
  43 #undef DBGC_CLASS
  44 #define DBGC_CLASS DBGC_WINBIND
  45
  46 extern bool override_logfile;
  47
  48 static struct winbindd_child *winbindd_children = NULL;
  49
  50 /* Read some data from a client connection */
  51
  52 static NTSTATUS child_read_request(int sock, struct winbindd_request *wreq)
  53 {
  54         NTSTATUS status;
  55
  56         status = read_data_ntstatus(sock, (char *)wreq, sizeof(*wreq));
  57         if (!NT_STATUS_IS_OK(status)) {
  58                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  59                           nt_errstr(status)));
  60                 return status;
  61         }
  62
  63         if (wreq->extra_len == 0) {
  64                 wreq->extra_data.data = NULL;
  65                 return NT_STATUS_OK;
  66         }
  67
  68         DEBUG(10, ("Need to read %d extra bytes\n", (int)wreq->extra_len));
  69
  70         wreq->extra_data.data = SMB_MALLOC_ARRAY(char, wreq->extra_len + 1);
  71         if (wreq->extra_data.data == NULL) {
  72                 DEBUG(0, ("malloc failed\n"));
  73                 return NT_STATUS_NO_MEMORY;
  74         }
  75
  76         /* Ensure null termination */
  77         wreq->extra_data.data[wreq->extra_len] = '\0';
  78
  79         status = read_data_ntstatus(sock, wreq->extra_data.data,
  80                                     wreq->extra_len);
  81         if (!NT_STATUS_IS_OK(status)) {
  82                 DEBUG(0, ("Could not read extra data: %s\n",
  83                           nt_errstr(status)));
  84         }
  85         return status;
  86 }
  87
  88 static NTSTATUS child_write_response(int sock, struct winbindd_response *wrsp)
  89 {
  90         struct iovec iov[2];
  91         int iov_count;
  92
  93         iov[0].iov_base = (void *)wrsp;
  94         iov[0].iov_len = sizeof(struct winbindd_response);
  95         iov_count = 1;
  96
  97         if (wrsp->length > sizeof(struct winbindd_response)) {
  98                 iov[1].iov_base = (void *)wrsp->extra_data.data;
  99                 iov[1].iov_len = wrsp->length-iov[0].iov_len;
 100                 iov_count = 2;
 101         }
 102
 103         DEBUG(10, ("Writing %d bytes to parent\n", (int)wrsp->length));
 104
 105         if (write_data_iov(sock, iov, iov_count) != wrsp->length) {
 106                 DEBUG(0, ("Could not write result\n"));
 107                 return NT_STATUS_INVALID_HANDLE;
 108         }
 109
 110         return NT_STATUS_OK;
 111 }
 112
 113 /*
 114  * Do winbind child async request. This is not simply wb_simple_trans. We have
 115  * to do the queueing ourselves because while a request is queued, the child
 116  * might have crashed, and we have to re-fork it in the _trigger function.
 117  */
 118
 119 struct wb_child_request_state {
 120         struct tevent_context *ev;
 121         struct winbindd_child *child;
 122         struct winbindd_request *request;
 123         struct winbindd_response *response;
 124 };
 125
 126 static bool fork_domain_child(struct winbindd_child *child);
 127
 128 static void wb_child_request_trigger(struct tevent_req *req,
 129                                             void *private_data);
 130 static void wb_child_request_done(struct tevent_req *subreq);
 131
 132 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
 133                                          struct tevent_context *ev,
 134                                          struct winbindd_child *child,
 135                                          struct winbindd_request *request)
 136 {
 137         struct tevent_req *req;
 138         struct wb_child_request_state *state;
 139
 140         req = tevent_req_create(mem_ctx, &state,
 141                                 struct wb_child_request_state);
 142         if (req == NULL) {
 143                 return NULL;
 144         }
 145
 146         state->ev = ev;
 147         state->child = child;
 148         state->request = request;
 149
 150         if (!tevent_queue_add(child->queue, ev, req,
 151                               wb_child_request_trigger, NULL)) {
 152                 tevent_req_oom(req);
 153                 return tevent_req_post(req, ev);
 154         }
 155         return req;
 156 }
 157
 158 static void wb_child_request_trigger(struct tevent_req *req,
 159                                      void *private_data)
 160 {
 161         struct wb_child_request_state *state = tevent_req_data(
 162                 req, struct wb_child_request_state);
 163         struct tevent_req *subreq;
 164
 165         if ((state->child->sock == -1) && (!fork_domain_child(state->child))) {
 166                 tevent_req_error(req, errno);
 167                 return;
 168         }
 169
 170         subreq = wb_simple_trans_send(state, winbind_event_context(), NULL,
 171                                       state->child->sock, state->request);
 172         if (tevent_req_nomem(subreq, req)) {
 173                 return;
 174         }
 175         tevent_req_set_callback(subreq, wb_child_request_done, req);
 176         tevent_req_set_endtime(req, state->ev, timeval_current_ofs(300, 0));
 177 }
 178
 179 static void wb_child_request_done(struct tevent_req *subreq)
 180 {
 181         struct tevent_req *req = tevent_req_callback_data(
 182                 subreq, struct tevent_req);
 183         struct wb_child_request_state *state = tevent_req_data(
 184                 req, struct wb_child_request_state);
 185         int ret, err;
 186
 187         ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
 188         TALLOC_FREE(subreq);
 189         if (ret == -1) {
 190                 /*
 191                  * The basic parent/child communication broke, close
 192                  * our socket
 193                  */
 194                 close(state->child->sock);
 195                 state->child->sock = -1;
 196                 DLIST_REMOVE(winbindd_children, state->child);
 197                 tevent_req_error(req, err);
 198                 return;
 199         }
 200         tevent_req_done(req);
 201 }
 202
 203 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 204                           struct winbindd_response **presponse, int *err)
 205 {
 206         struct wb_child_request_state *state = tevent_req_data(
 207                 req, struct wb_child_request_state);
 208
 209         if (tevent_req_is_unix_error(req, err)) {
 210                 return -1;
 211         }
 212         *presponse = talloc_move(mem_ctx, &state->response);
 213         return 0;
 214 }
 215
 216 static bool winbindd_child_busy(struct winbindd_child *child)
 217 {
 218         return tevent_queue_length(child->queue) > 0;
 219 }
 220
 221 static struct winbindd_child *find_idle_child(struct winbindd_domain *domain)
 222 {
 223         int i;
 224
 225         for (i=0; i<lp_winbind_max_domain_connections(); i++) {
 226                 if (!winbindd_child_busy(&domain->children[i])) {
 227                         return &domain->children[i];
 228                 }
 229         }
 230
 231         return NULL;
 232 }
 233
 234 struct winbindd_child *choose_domain_child(struct winbindd_domain *domain)
 235 {
 236         struct winbindd_child *result;
 237
 238         result = find_idle_child(domain);
 239         if (result != NULL) {
 240                 return result;
 241         }
 242         return &domain->children[rand() % lp_winbind_max_domain_connections()];
 243 }
 244
 245 struct dcerpc_binding_handle *dom_child_handle(struct winbindd_domain *domain)
 246 {
 247         struct winbindd_child *child;
 248
 249         child = choose_domain_child(domain);
 250         return child->binding_handle;
 251 }
 252
 253 struct wb_domain_request_state {
 254         struct tevent_context *ev;
 255         struct winbindd_domain *domain;
 256         struct winbindd_child *child;
 257         struct winbindd_request *request;
 258         struct winbindd_request *init_req;
 259         struct winbindd_response *response;
 260 };
 261
 262 static void wb_domain_request_gotdc(struct tevent_req *subreq);
 263 static void wb_domain_request_initialized(struct tevent_req *subreq);
 264 static void wb_domain_request_done(struct tevent_req *subreq);
 265
 266 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
 267                                           struct tevent_context *ev,
 268                                           struct winbindd_domain *domain,
 269                                           struct winbindd_request *request)
 270 {
 271         struct tevent_req *req, *subreq;
 272         struct wb_domain_request_state *state;
 273
 274         req = tevent_req_create(mem_ctx, &state,
 275                                 struct wb_domain_request_state);
 276         if (req == NULL) {
 277                 return NULL;
 278         }
 279
 280         state->child = choose_domain_child(domain);
 281
 282         if (domain->initialized) {
 283                 subreq = wb_child_request_send(state, ev, state->child,
 284                                                request);
 285                 if (tevent_req_nomem(subreq, req)) {
 286                         return tevent_req_post(req, ev);
 287                 }
 288                 tevent_req_set_callback(subreq, wb_domain_request_done, req);
 289                 return req;
 290         }
 291
 292         state->domain = domain;
 293         state->ev = ev;
 294         state->request = request;
 295
 296         state->init_req = talloc_zero(state, struct winbindd_request);
 297         if (tevent_req_nomem(state->init_req, req)) {
 298                 return tevent_req_post(req, ev);
 299         }
 300
 301         if (IS_DC || domain->primary || domain->internal) {
 302                 /* The primary domain has to find the DC name itself */
 303                 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 304                 fstrcpy(state->init_req->domain_name, domain->name);
 305                 state->init_req->data.init_conn.is_primary = domain->primary;
 306                 fstrcpy(state->init_req->data.init_conn.dcname, "");
 307
 308                 subreq = wb_child_request_send(state, ev, state->child,
 309                                                state->init_req);
 310                 if (tevent_req_nomem(subreq, req)) {
 311                         return tevent_req_post(req, ev);
 312                 }
 313                 tevent_req_set_callback(subreq, wb_domain_request_initialized,
 314                                         req);
 315                 return req;
 316         }
 317
 318         /*
 319          * Ask our DC for a DC name
 320          */
 321         domain = find_our_domain();
 322
 323         /* This is *not* the primary domain, let's ask our DC about a DC
 324          * name */
 325
 326         state->init_req->cmd = WINBINDD_GETDCNAME;
 327         fstrcpy(state->init_req->domain_name, domain->name);
 328
 329         subreq = wb_child_request_send(state, ev, state->child, request);
 330         if (tevent_req_nomem(subreq, req)) {
 331                 return tevent_req_post(req, ev);
 332         }
 333         tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
 334         return req;
 335 }
 336
 337 static void wb_domain_request_gotdc(struct tevent_req *subreq)
 338 {
 339         struct tevent_req *req = tevent_req_callback_data(
 340                 subreq, struct tevent_req);
 341         struct wb_domain_request_state *state = tevent_req_data(
 342                 req, struct wb_domain_request_state);
 343         struct winbindd_response *response;
 344         int ret, err;
 345
 346         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 347         TALLOC_FREE(subreq);
 348         if (ret == -1) {
 349                 tevent_req_error(req, err);
 350                 return;
 351         }
 352         state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 353         fstrcpy(state->init_req->domain_name, state->domain->name);
 354         state->init_req->data.init_conn.is_primary = False;
 355         fstrcpy(state->init_req->data.init_conn.dcname,
 356                 response->data.dc_name);
 357
 358         TALLOC_FREE(response);
 359
 360         subreq = wb_child_request_send(state, state->ev, state->child,
 361                                        state->init_req);
 362         if (tevent_req_nomem(subreq, req)) {
 363                 return;
 364         }
 365         tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
 366 }
 367
 368 static void wb_domain_request_initialized(struct tevent_req *subreq)
 369 {
 370         struct tevent_req *req = tevent_req_callback_data(
 371                 subreq, struct tevent_req);
 372         struct wb_domain_request_state *state = tevent_req_data(
 373                 req, struct wb_domain_request_state);
 374         struct winbindd_response *response;
 375         int ret, err;
 376
 377         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 378         TALLOC_FREE(subreq);
 379         if (ret == -1) {
 380                 tevent_req_error(req, err);
 381                 return;
 382         }
 383
 384         if (!string_to_sid(&state->domain->sid,
 385                            response->data.domain_info.sid)) {
 386                 DEBUG(1,("init_child_recv: Could not convert sid %s "
 387                         "from string\n", response->data.domain_info.sid));
 388                 tevent_req_error(req, EINVAL);
 389                 return;
 390         }
 391
 392         talloc_free(state->domain->name);
 393         state->domain->name = talloc_strdup(state->domain,
 394                                             response->data.domain_info.name);
 395         if (state->domain->name == NULL) {
 396                 tevent_req_error(req, ENOMEM);
 397                 return;
 398         }
 399
 400         if (response->data.domain_info.alt_name[0] != '\0') {
 401                 talloc_free(state->domain->alt_name);
 402
 403                 state->domain->alt_name = talloc_strdup(state->domain,
 404                                 response->data.domain_info.alt_name);
 405                 if (state->domain->alt_name == NULL) {
 406                         tevent_req_error(req, ENOMEM);
 407                         return;
 408                 }
 409         }
 410
 411         state->domain->native_mode = response->data.domain_info.native_mode;
 412         state->domain->active_directory =
 413                 response->data.domain_info.active_directory;
 414         state->domain->initialized = true;
 415
 416         TALLOC_FREE(response);
 417
 418         subreq = wb_child_request_send(state, state->ev, state->child,
 419                                        state->request);
 420         if (tevent_req_nomem(subreq, req)) {
 421                 return;
 422         }
 423         tevent_req_set_callback(subreq, wb_domain_request_done, req);
 424 }
 425
 426 static void wb_domain_request_done(struct tevent_req *subreq)
 427 {
 428         struct tevent_req *req = tevent_req_callback_data(
 429                 subreq, struct tevent_req);
 430         struct wb_domain_request_state *state = tevent_req_data(
 431                 req, struct wb_domain_request_state);
 432         int ret, err;
 433
 434         ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
 435                                     &err);
 436         TALLOC_FREE(subreq);
 437         if (ret == -1) {
 438                 tevent_req_error(req, err);
 439                 return;
 440         }
 441         tevent_req_done(req);
 442 }
 443
 444 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 445                            struct winbindd_response **presponse, int *err)
 446 {
 447         struct wb_domain_request_state *state = tevent_req_data(
 448                 req, struct wb_domain_request_state);
 449
 450         if (tevent_req_is_unix_error(req, err)) {
 451                 return -1;
 452         }
 453         *presponse = talloc_move(mem_ctx, &state->response);
 454         return 0;
 455 }
 456
 457 static void child_process_request(struct winbindd_child *child,
 458                                   struct winbindd_cli_state *state)
 459 {
 460         struct winbindd_domain *domain = child->domain;
 461         const struct winbindd_child_dispatch_table *table = child->table;
 462
 463         /* Free response data - we may be interrupted and receive another
 464            command before being able to send this data off. */
 465
 466         state->response->result = WINBINDD_ERROR;
 467         state->response->length = sizeof(struct winbindd_response);
 468
 469         /* as all requests in the child are sync, we can use talloc_tos() */
 470         state->mem_ctx = talloc_tos();
 471
 472         /* Process command */
 473
 474         for (; table->name; table++) {
 475                 if (state->request->cmd == table->struct_cmd) {
 476                         DEBUG(10,("child_process_request: request fn %s\n",
 477                                   table->name));
 478                         state->response->result = table->struct_fn(domain, state);
 479                         return;
 480                 }
 481         }
 482
 483         DEBUG(1, ("child_process_request: unknown request fn number %d\n",
 484                   (int)state->request->cmd));
 485         state->response->result = WINBINDD_ERROR;
 486 }
 487
 488 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 489                  const struct winbindd_child_dispatch_table *table,
 490                  const char *logprefix,
 491                  const char *logname)
 492 {
 493         if (logprefix && logname) {
 494                 char *logbase = NULL;
 495
 496                 if (*lp_logfile(talloc_tos())) {
 497                         char *end = NULL;
 498
 499                         if (asprintf(&logbase, "%s", lp_logfile(talloc_tos())) < 0) {
 500                                 smb_panic("Internal error: asprintf failed");
 501                         }
 502
 503                         if ((end = strrchr_m(logbase, '/'))) {
 504                                 *end = '\0';
 505                         }
 506                 } else {
 507                         if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
 508                                 smb_panic("Internal error: asprintf failed");
 509                         }
 510                 }
 511
 512                 if (asprintf(&child->logfilename, "%s/%s-%s",
 513                              logbase, logprefix, logname) < 0) {
 514                         SAFE_FREE(logbase);
 515                         smb_panic("Internal error: asprintf failed");
 516                 }
 517
 518                 SAFE_FREE(logbase);
 519         } else {
 520                 smb_panic("Internal error: logprefix == NULL && "
 521                           "logname == NULL");
 522         }
 523
 524         child->sock = -1;
 525         child->domain = domain;
 526         child->table = table;
 527         child->queue = tevent_queue_create(NULL, "winbind_child");
 528         SMB_ASSERT(child->queue != NULL);
 529         child->binding_handle = wbint_binding_handle(NULL, domain, child);
 530         SMB_ASSERT(child->binding_handle != NULL);
 531 }
 532
 533 void winbind_child_died(pid_t pid)
 534 {
 535         struct winbindd_child *child;
 536
 537         for (child = winbindd_children; child != NULL; child = child->next) {
 538                 if (child->pid == pid) {
 539                         break;
 540                 }
 541         }
 542
 543         if (child == NULL) {
 544                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 545                 return;
 546         }
 547
 548         /* This will be re-added in fork_domain_child() */
 549
 550         DLIST_REMOVE(winbindd_children, child);
 551         child->pid = 0;
 552
 553         if (child->sock != -1) {
 554                 close(child->sock);
 555                 child->sock = -1;
 556         }
 557 }
 558
 559 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 560
 561 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 562 {
 563         flush_negative_conn_cache_for_domain(domain->name);
 564         if (domain->alt_name != NULL) {
 565                 flush_negative_conn_cache_for_domain(domain->alt_name);
 566         }
 567 }
 568
 569 /*
 570  * Parent winbindd process sets its own debug level first and then
 571  * sends a message to all the winbindd children to adjust their debug
 572  * level to that of parents.
 573  */
 574
 575 void winbind_msg_debug(struct messaging_context *msg_ctx,
 576                          void *private_data,
 577                          uint32_t msg_type,
 578                          struct server_id server_id,
 579                          DATA_BLOB *data)
 580 {
 581         struct winbindd_child *child;
 582
 583         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 584
 585         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 586
 587         for (child = winbindd_children; child != NULL; child = child->next) {
 588
 589                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 590                         (unsigned int)child->pid));
 591
 592                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 593                            MSG_DEBUG,
 594                            data->data,
 595                            strlen((char *) data->data) + 1);
 596         }
 597 }
 598
 599 /* Set our domains as offline and forward the offline message to our children. */
 600
 601 void winbind_msg_offline(struct messaging_context *msg_ctx,
 602                          void *private_data,
 603                          uint32_t msg_type,
 604                          struct server_id server_id,
 605                          DATA_BLOB *data)
 606 {
 607         struct winbindd_child *child;
 608         struct winbindd_domain *domain;
 609
 610         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 611
 612         if (!lp_winbind_offline_logon()) {
 613                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 614                 return;
 615         }
 616
 617         /* Set our global state as offline. */
 618         if (!set_global_winbindd_state_offline()) {
 619                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 620                 return;
 621         }
 622
 623         /* Set all our domains as offline. */
 624         for (domain = domain_list(); domain; domain = domain->next) {
 625                 if (domain->internal) {
 626                         continue;
 627                 }
 628                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 629                 set_domain_offline(domain);
 630         }
 631
 632         for (child = winbindd_children; child != NULL; child = child->next) {
 633                 /* Don't send message to internal children.  We've already
 634                    done so above. */
 635                 if (!child->domain || winbindd_internal_child(child)) {
 636                         continue;
 637                 }
 638
 639                 /* Or internal domains (this should not be possible....) */
 640                 if (child->domain->internal) {
 641                         continue;
 642                 }
 643
 644                 /* Each winbindd child should only process requests for one domain - make sure
 645                    we only set it online / offline for that domain. */
 646
 647                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 648                         (unsigned int)child->pid, child->domain->name ));
 649
 650                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 651                                    MSG_WINBIND_OFFLINE,
 652                                    (const uint8_t *)child->domain->name,
 653                                    strlen(child->domain->name)+1);
 654         }
 655 }
 656
 657 /* Set our domains as online and forward the online message to our children. */
 658
 659 void winbind_msg_online(struct messaging_context *msg_ctx,
 660                         void *private_data,
 661                         uint32_t msg_type,
 662                         struct server_id server_id,
 663                         DATA_BLOB *data)
 664 {
 665         struct winbindd_child *child;
 666         struct winbindd_domain *domain;
 667
 668         DEBUG(10,("winbind_msg_online: got online message.\n"));
 669
 670         if (!lp_winbind_offline_logon()) {
 671                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 672                 return;
 673         }
 674
 675         /* Set our global state as online. */
 676         set_global_winbindd_state_online();
 677
 678         smb_nscd_flush_user_cache();
 679         smb_nscd_flush_group_cache();
 680
 681         /* Set all our domains as online. */
 682         for (domain = domain_list(); domain; domain = domain->next) {
 683                 if (domain->internal) {
 684                         continue;
 685                 }
 686                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 687
 688                 winbindd_flush_negative_conn_cache(domain);
 689                 set_domain_online_request(domain);
 690
 691                 /* Send an online message to the idmap child when our
 692                    primary domain comes back online */
 693
 694                 if ( domain->primary ) {
 695                         struct winbindd_child *idmap = idmap_child();
 696
 697                         if ( idmap->pid != 0 ) {
 698                                 messaging_send_buf(msg_ctx,
 699                                                    pid_to_procid(idmap->pid),
 700                                                    MSG_WINBIND_ONLINE,
 701                                                    (const uint8_t *)domain->name,
 702                                                    strlen(domain->name)+1);
 703                         }
 704                 }
 705         }
 706
 707         for (child = winbindd_children; child != NULL; child = child->next) {
 708                 /* Don't send message to internal childs. */
 709                 if (!child->domain || winbindd_internal_child(child)) {
 710                         continue;
 711                 }
 712
 713                 /* Or internal domains (this should not be possible....) */
 714                 if (child->domain->internal) {
 715                         continue;
 716                 }
 717
 718                 /* Each winbindd child should only process requests for one domain - make sure
 719                    we only set it online / offline for that domain. */
 720
 721                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 722                         (unsigned int)child->pid, child->domain->name ));
 723
 724                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 725                                    MSG_WINBIND_ONLINE,
 726                                    (const uint8_t *)child->domain->name,
 727                                    strlen(child->domain->name)+1);
 728         }
 729 }
 730
 731 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 732 {
 733         struct winbindd_domain *domain;
 734         char *buf = NULL;
 735
 736         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 737                                    get_global_winbindd_state_offline() ?
 738                                    "Offline":"Online")) == NULL) {
 739                 return NULL;
 740         }
 741
 742         for (domain = domain_list(); domain; domain = domain->next) {
 743                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 744                                                   domain->name,
 745                                                   domain->online ?
 746                                                   "Online":"Offline")) == NULL) {
 747                         return NULL;
 748                 }
 749         }
 750
 751         buf = talloc_asprintf_append_buffer(buf, "\n");
 752
 753         DEBUG(5,("collect_onlinestatus: %s", buf));
 754
 755         return buf;
 756 }
 757
 758 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 759                               void *private_data,
 760                               uint32_t msg_type,
 761                               struct server_id server_id,
 762                               DATA_BLOB *data)
 763 {
 764         TALLOC_CTX *mem_ctx;
 765         const char *message;
 766         struct server_id *sender;
 767
 768         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 769
 770         if (!data->data) {
 771                 return;
 772         }
 773
 774         sender = (struct server_id *)data->data;
 775
 776         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 777         if (mem_ctx == NULL) {
 778                 return;
 779         }
 780
 781         message = collect_onlinestatus(mem_ctx);
 782         if (message == NULL) {
 783                 talloc_destroy(mem_ctx);
 784                 return;
 785         }
 786
 787         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 788                            (const uint8 *)message, strlen(message) + 1);
 789
 790         talloc_destroy(mem_ctx);
 791 }
 792
 793 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 794                                  void *private_data,
 795                                  uint32_t msg_type,
 796                                  struct server_id server_id,
 797                                  DATA_BLOB *data)
 798 {
 799         struct winbindd_child *child;
 800
 801         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 802
 803         dump_event_list(winbind_event_context());
 804
 805         for (child = winbindd_children; child != NULL; child = child->next) {
 806
 807                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 808                         (unsigned int)child->pid));
 809
 810                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 811                                    MSG_DUMP_EVENT_LIST,
 812                                    NULL, 0);
 813         }
 814
 815 }
 816
 817 void winbind_msg_dump_domain_list(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 = NULL;
 825         struct server_id *sender = NULL;
 826         const char *domain = NULL;
 827         char *s = NULL;
 828         NTSTATUS status;
 829         struct winbindd_domain *dom = NULL;
 830
 831         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 832
 833         if (!data || !data->data) {
 834                 return;
 835         }
 836
 837         if (data->length < sizeof(struct server_id)) {
 838                 return;
 839         }
 840
 841         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 842         if (!mem_ctx) {
 843                 return;
 844         }
 845
 846         sender = (struct server_id *)data->data;
 847         if (data->length > sizeof(struct server_id)) {
 848                 domain = (const char *)data->data+sizeof(struct server_id);
 849         }
 850
 851         if (domain) {
 852
 853                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 854                         domain));
 855
 856                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 857                                                   find_domain_from_name_noinit(domain));
 858                 if (!message) {
 859                         talloc_destroy(mem_ctx);
 860                         return;
 861                 }
 862
 863                 messaging_send_buf(msg_ctx, *sender,
 864                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 865                                    (const uint8_t *)message, strlen(message) + 1);
 866
 867                 talloc_destroy(mem_ctx);
 868
 869                 return;
 870         }
 871
 872         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 873
 874         for (dom = domain_list(); dom; dom=dom->next) {
 875                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 876                 if (!message) {
 877                         talloc_destroy(mem_ctx);
 878                         return;
 879                 }
 880
 881                 s = talloc_asprintf_append(s, "%s\n", message);
 882                 if (!s) {
 883                         talloc_destroy(mem_ctx);
 884                         return;
 885                 }
 886         }
 887
 888         status = messaging_send_buf(msg_ctx, *sender,
 889                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 890                                     (uint8_t *)s, strlen(s) + 1);
 891         if (!NT_STATUS_IS_OK(status)) {
 892                 DEBUG(0,("failed to send message: %s\n",
 893                 nt_errstr(status)));
 894         }
 895
 896         talloc_destroy(mem_ctx);
 897 }
 898
 899 static void account_lockout_policy_handler(struct tevent_context *ctx,
 900                                            struct tevent_timer *te,
 901                                            struct timeval now,
 902                                            void *private_data)
 903 {
 904         struct winbindd_child *child =
 905                 (struct winbindd_child *)private_data;
 906         TALLOC_CTX *mem_ctx = NULL;
 907         struct winbindd_methods *methods;
 908         struct samr_DomInfo12 lockout_policy;
 909         NTSTATUS result;
 910
 911         DEBUG(10,("account_lockout_policy_handler called\n"));
 912
 913         TALLOC_FREE(child->lockout_policy_event);
 914
 915         if ( !winbindd_can_contact_domain( child->domain ) ) {
 916                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 917                           "do not have an incoming trust to domain %s\n",
 918                           child->domain->name));
 919
 920                 return;
 921         }
 922
 923         methods = child->domain->methods;
 924
 925         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 926         if (!mem_ctx) {
 927                 result = NT_STATUS_NO_MEMORY;
 928         } else {
 929                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 930         }
 931         TALLOC_FREE(mem_ctx);
 932
 933         if (!NT_STATUS_IS_OK(result)) {
 934                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 935                          nt_errstr(result)));
 936         }
 937
 938         child->lockout_policy_event = tevent_add_timer(winbind_event_context(), NULL,
 939                                                       timeval_current_ofs(3600, 0),
 940                                                       account_lockout_policy_handler,
 941                                                       child);
 942 }
 943
 944 static time_t get_machine_password_timeout(void)
 945 {
 946         /* until we have gpo support use lp setting */
 947         return lp_machine_password_timeout();
 948 }
 949
 950 static bool calculate_next_machine_pwd_change(const char *domain,
 951                                               struct timeval *t)
 952 {
 953         time_t pass_last_set_time;
 954         time_t timeout;
 955         time_t next_change;
 956         struct timeval tv;
 957         char *pw;
 958
 959         pw = secrets_fetch_machine_password(domain,
 960                                             &pass_last_set_time,
 961                                             NULL);
 962
 963         if (pw == NULL) {
 964                 DEBUG(0,("cannot fetch own machine password ????"));
 965                 return false;
 966         }
 967
 968         SAFE_FREE(pw);
 969
 970         timeout = get_machine_password_timeout();
 971         if (timeout == 0) {
 972                 DEBUG(10,("machine password never expires\n"));
 973                 return false;
 974         }
 975
 976         tv.tv_sec = pass_last_set_time;
 977         DEBUG(10, ("password last changed %s\n",
 978                    timeval_string(talloc_tos(), &tv, false)));
 979         tv.tv_sec += timeout;
 980         DEBUGADD(10, ("password valid until %s\n",
 981                       timeval_string(talloc_tos(), &tv, false)));
 982
 983         if (time(NULL) < (pass_last_set_time + timeout)) {
 984                 next_change = pass_last_set_time + timeout;
 985                 DEBUG(10,("machine password still valid until: %s\n",
 986                         http_timestring(talloc_tos(), next_change)));
 987                 *t = timeval_set(next_change, 0);
 988
 989                 if (lp_clustering()) {
 990                         uint8_t randbuf;
 991                         /*
 992                          * When having a cluster, we have several
 993                          * winbinds racing for the password change. In
 994                          * the machine_password_change_handler()
 995                          * function we check if someone else was
 996                          * faster when the event triggers. We add a
 997                          * 255-second random delay here, so that we
 998                          * don't run to change the password at the
 999                          * exact same moment.
1000                          */
1001                         generate_random_buffer(&randbuf, sizeof(randbuf));
1002                         DEBUG(10, ("adding %d seconds randomness\n",
1003                                    (int)randbuf));
1004                         t->tv_sec += randbuf;
1005                 }
1006                 return true;
1007         }
1008
1009         DEBUG(10,("machine password expired, needs immediate change\n"));
1010
1011         *t = timeval_zero();
1012
1013         return true;
1014 }
1015
1016 static void machine_password_change_handler(struct tevent_context *ctx,
1017                                             struct tevent_timer *te,
1018                                             struct timeval now,
1019                                             void *private_data)
1020 {
1021         struct messaging_context *msg_ctx = winbind_messaging_context();
1022         struct winbindd_child *child =
1023                 (struct winbindd_child *)private_data;
1024         struct rpc_pipe_client *netlogon_pipe = NULL;
1025         NTSTATUS result;
1026         struct timeval next_change;
1027
1028         DEBUG(10,("machine_password_change_handler called\n"));
1029
1030         TALLOC_FREE(child->machine_password_change_event);
1031
1032         if (!calculate_next_machine_pwd_change(child->domain->name,
1033                                                &next_change)) {
1034                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1035                 return;
1036         }
1037
1038         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1039                    timeval_string(talloc_tos(), &next_change, false)));
1040
1041         if (!timeval_expired(&next_change)) {
1042                 DEBUG(10, ("Someone else has already changed the pw\n"));
1043                 goto done;
1044         }
1045
1046         if (!winbindd_can_contact_domain(child->domain)) {
1047                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
1048                           "do not have an incoming trust to domain %s\n",
1049                           child->domain->name));
1050                 return;
1051         }
1052
1053         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
1054         if (!NT_STATUS_IS_OK(result)) {
1055                 DEBUG(10,("machine_password_change_handler: "
1056                         "failed to connect netlogon pipe: %s\n",
1057                          nt_errstr(result)));
1058                 return;
1059         }
1060
1061         result = trust_pw_change(child->domain->conn.netlogon_creds,
1062                                  msg_ctx,
1063                                  netlogon_pipe->binding_handle,
1064                                  child->domain->name,
1065                                  false); /* force */
1066
1067         DEBUG(10, ("machine_password_change_handler: "
1068                    "trust_pw_change returned %s\n",
1069                    nt_errstr(result)));
1070
1071         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
1072                 DEBUG(3,("machine_password_change_handler: password set returned "
1073                          "ACCESS_DENIED.  Maybe the trust account "
1074                          "password was changed and we didn't know it. "
1075                          "Killing connections to domain %s\n",
1076                          child->domain->name));
1077                 invalidate_cm_connection(child->domain);
1078         }
1079
1080         if (!calculate_next_machine_pwd_change(child->domain->name,
1081                                                &next_change)) {
1082                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1083                 return;
1084         }
1085
1086         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1087                    timeval_string(talloc_tos(), &next_change, false)));
1088
1089         if (!NT_STATUS_IS_OK(result)) {
1090                 struct timeval tmp;
1091                 /*
1092                  * In case of failure, give the DC a minute to recover
1093                  */
1094                 tmp = timeval_current_ofs(60, 0);
1095                 next_change = timeval_max(&next_change, &tmp);
1096         }
1097
1098 done:
1099         child->machine_password_change_event = tevent_add_timer(winbind_event_context(), NULL,
1100                                                               next_change,
1101                                                               machine_password_change_handler,
1102                                                               child);
1103 }
1104
1105 /* Deal with a request to go offline. */
1106
1107 static void child_msg_offline(struct messaging_context *msg,
1108                               void *private_data,
1109                               uint32_t msg_type,
1110                               struct server_id server_id,
1111                               DATA_BLOB *data)
1112 {
1113         struct winbindd_domain *domain;
1114         struct winbindd_domain *primary_domain = NULL;
1115         const char *domainname = (const char *)data->data;
1116
1117         if (data->data == NULL || data->length == 0) {
1118                 return;
1119         }
1120
1121         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1122
1123         if (!lp_winbind_offline_logon()) {
1124                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1125                 return;
1126         }
1127
1128         primary_domain = find_our_domain();
1129
1130         /* Mark the requested domain offline. */
1131
1132         for (domain = domain_list(); domain; domain = domain->next) {
1133                 if (domain->internal) {
1134                         continue;
1135                 }
1136                 if (strequal(domain->name, domainname)) {
1137                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1138                         set_domain_offline(domain);
1139                         /* we are in the trusted domain, set the primary domain
1140                          * offline too */
1141                         if (domain != primary_domain) {
1142                                 set_domain_offline(primary_domain);
1143                         }
1144                 }
1145         }
1146 }
1147
1148 /* Deal with a request to go online. */
1149
1150 static void child_msg_online(struct messaging_context *msg,
1151                              void *private_data,
1152                              uint32_t msg_type,
1153                              struct server_id server_id,
1154                              DATA_BLOB *data)
1155 {
1156         struct winbindd_domain *domain;
1157         struct winbindd_domain *primary_domain = NULL;
1158         const char *domainname = (const char *)data->data;
1159
1160         if (data->data == NULL || data->length == 0) {
1161                 return;
1162         }
1163
1164         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1165
1166         if (!lp_winbind_offline_logon()) {
1167                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1168                 return;
1169         }
1170
1171         primary_domain = find_our_domain();
1172
1173         /* Set our global state as online. */
1174         set_global_winbindd_state_online();
1175
1176         /* Try and mark everything online - delete any negative cache entries
1177            to force a reconnect now. */
1178
1179         for (domain = domain_list(); domain; domain = domain->next) {
1180                 if (domain->internal) {
1181                         continue;
1182                 }
1183                 if (strequal(domain->name, domainname)) {
1184                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1185                         winbindd_flush_negative_conn_cache(domain);
1186                         set_domain_online_request(domain);
1187
1188                         /* we can be in trusted domain, which will contact primary domain
1189                          * we have to bring primary domain online in trusted domain process
1190                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1191                          * --> contact_domain = find_our_domain()
1192                          * */
1193                         if (domain != primary_domain) {
1194                                 winbindd_flush_negative_conn_cache(primary_domain);
1195                                 set_domain_online_request(primary_domain);
1196                         }
1197                 }
1198         }
1199 }
1200
1201 static void child_msg_dump_event_list(struct messaging_context *msg,
1202                                       void *private_data,
1203                                       uint32_t msg_type,
1204                                       struct server_id server_id,
1205                                       DATA_BLOB *data)
1206 {
1207         DEBUG(5,("child_msg_dump_event_list received\n"));
1208
1209         dump_event_list(winbind_event_context());
1210 }
1211
1212 NTSTATUS winbindd_reinit_after_fork(const struct winbindd_child *myself,
1213                                     const char *logfilename)
1214 {
1215         struct winbindd_domain *domain;
1216         struct winbindd_child *cl;
1217         NTSTATUS status;
1218
1219         status = reinit_after_fork(
1220                 winbind_messaging_context(),
1221                 winbind_event_context(),
1222                 true);
1223         if (!NT_STATUS_IS_OK(status)) {
1224                 DEBUG(0,("reinit_after_fork() failed\n"));
1225                 return status;
1226         }
1227
1228         close_conns_after_fork();
1229
1230         if (!override_logfile && logfilename) {
1231                 lp_set_logfile(logfilename);
1232                 reopen_logs();
1233         }
1234
1235         if (!winbindd_setup_sig_term_handler(false))
1236                 return NT_STATUS_NO_MEMORY;
1237         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1238                                             logfilename))
1239                 return NT_STATUS_NO_MEMORY;
1240
1241         /* Stop zombies in children */
1242         CatchChild();
1243
1244         /* Don't handle the same messages as our parent. */
1245         messaging_deregister(winbind_messaging_context(),
1246                              MSG_SMB_CONF_UPDATED, NULL);
1247         messaging_deregister(winbind_messaging_context(),
1248                              MSG_SHUTDOWN, NULL);
1249         messaging_deregister(winbind_messaging_context(),
1250                              MSG_WINBIND_OFFLINE, NULL);
1251         messaging_deregister(winbind_messaging_context(),
1252                              MSG_WINBIND_ONLINE, NULL);
1253         messaging_deregister(winbind_messaging_context(),
1254                              MSG_WINBIND_ONLINESTATUS, NULL);
1255         messaging_deregister(winbind_messaging_context(),
1256                              MSG_DUMP_EVENT_LIST, NULL);
1257         messaging_deregister(winbind_messaging_context(),
1258                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1259         messaging_deregister(winbind_messaging_context(),
1260                              MSG_DEBUG, NULL);
1261
1262         messaging_deregister(winbind_messaging_context(),
1263                              MSG_WINBIND_DOMAIN_OFFLINE, NULL);
1264         messaging_deregister(winbind_messaging_context(),
1265                              MSG_WINBIND_DOMAIN_ONLINE, NULL);
1266
1267         /* We have destroyed all events in the winbindd_event_context
1268          * in reinit_after_fork(), so clean out all possible pending
1269          * event pointers. */
1270
1271         /* Deal with check_online_events. */
1272
1273         for (domain = domain_list(); domain; domain = domain->next) {
1274                 TALLOC_FREE(domain->check_online_event);
1275         }
1276
1277         /* Ensure we're not handling a credential cache event inherited
1278          * from our parent. */
1279
1280         ccache_remove_all_after_fork();
1281
1282         /* Destroy all possible events in child list. */
1283         for (cl = winbindd_children; cl != NULL; cl = cl->next) {
1284                 TALLOC_FREE(cl->lockout_policy_event);
1285                 TALLOC_FREE(cl->machine_password_change_event);
1286
1287                 /* Children should never be able to send
1288                  * each other messages, all messages must
1289                  * go through the parent.
1290                  */
1291                 cl->pid = (pid_t)0;
1292
1293                 /*
1294                  * Close service sockets to all other children
1295                  */
1296                 if ((cl != myself) && (cl->sock != -1)) {
1297                         close(cl->sock);
1298                         cl->sock = -1;
1299                 }
1300         }
1301         /*
1302          * This is a little tricky, children must not
1303          * send an MSG_WINBIND_ONLINE message to idmap_child().
1304          * If we are in a child of our primary domain or
1305          * in the process created by fork_child_dc_connect(),
1306          * and the primary domain cannot go online,
1307          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1308          * periodically to idmap_child().
1309          *
1310          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1311          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1312          * ---> init_dc_connection() ---> cm_open_connection --->
1313          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1314          * idmap_child(). Disallow children sending messages
1315          * to each other, all messages must go through the parent.
1316          */
1317         cl = idmap_child();
1318         cl->pid = (pid_t)0;
1319
1320         return NT_STATUS_OK;
1321 }
1322
1323 /*
1324  * In a child there will be only one domain, reference that here.
1325  */
1326 static struct winbindd_domain *child_domain;
1327
1328 struct winbindd_domain *wb_child_domain(void)
1329 {
1330         return child_domain;
1331 }
1332
1333 struct child_handler_state {
1334         struct winbindd_child *child;
1335         struct winbindd_cli_state cli;
1336 };
1337
1338 static void child_handler(struct tevent_context *ev, struct tevent_fd *fde,
1339                           uint16_t flags, void *private_data)
1340 {
1341         struct child_handler_state *state =
1342                 (struct child_handler_state *)private_data;
1343         NTSTATUS status;
1344
1345         /* fetch a request from the main daemon */
1346         status = child_read_request(state->cli.sock, state->cli.request);
1347
1348         if (!NT_STATUS_IS_OK(status)) {
1349                 /* we lost contact with our parent */
1350                 _exit(0);
1351         }
1352
1353         DEBUG(4,("child daemon request %d\n",
1354                  (int)state->cli.request->cmd));
1355
1356         ZERO_STRUCTP(state->cli.response);
1357         state->cli.request->null_term = '\0';
1358         state->cli.mem_ctx = talloc_tos();
1359         child_process_request(state->child, &state->cli);
1360
1361         DEBUG(4, ("Finished processing child request %d\n",
1362                   (int)state->cli.request->cmd));
1363
1364         SAFE_FREE(state->cli.request->extra_data.data);
1365
1366         status = child_write_response(state->cli.sock, state->cli.response);
1367         if (!NT_STATUS_IS_OK(status)) {
1368                 exit(1);
1369         }
1370 }
1371
1372 static bool fork_domain_child(struct winbindd_child *child)
1373 {
1374         int fdpair[2];
1375         struct child_handler_state state;
1376         struct winbindd_request request;
1377         struct winbindd_response response;
1378         struct winbindd_domain *primary_domain = NULL;
1379         NTSTATUS status;
1380         ssize_t nwritten;
1381         struct tevent_fd *fde;
1382
1383         if (child->domain) {
1384                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1385                            child->domain->name));
1386         } else {
1387                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1388         }
1389
1390         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1391                 DEBUG(0, ("Could not open child pipe: %s\n",
1392                           strerror(errno)));
1393                 return False;
1394         }
1395
1396         ZERO_STRUCT(state);
1397         state.child = child;
1398         state.cli.pid = getpid();
1399         state.cli.request = &request;
1400         state.cli.response = &response;
1401
1402         child->pid = fork();
1403
1404         if (child->pid == -1) {
1405                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1406                 close(fdpair[0]);
1407                 close(fdpair[1]);
1408                 return False;
1409         }
1410
1411         if (child->pid != 0) {
1412                 /* Parent */
1413                 ssize_t nread;
1414
1415                 close(fdpair[0]);
1416
1417                 nread = sys_read(fdpair[1], &status, sizeof(status));
1418                 if (nread != sizeof(status)) {
1419                         DEBUG(1, ("fork_domain_child: Could not read child status: "
1420                                   "nread=%d, error=%s\n", (int)nread,
1421                                   strerror(errno)));
1422                         close(fdpair[1]);
1423                         return false;
1424                 }
1425                 if (!NT_STATUS_IS_OK(status)) {
1426                         DEBUG(1, ("fork_domain_child: Child status is %s\n",
1427                                   nt_errstr(status)));
1428                         close(fdpair[1]);
1429                         return false;
1430                 }
1431
1432                 child->next = child->prev = NULL;
1433                 DLIST_ADD(winbindd_children, child);
1434                 child->sock = fdpair[1];
1435                 return True;
1436         }
1437
1438         /* Child */
1439         child_domain = child->domain;
1440
1441         DEBUG(10, ("Child process %d\n", (int)getpid()));
1442
1443         state.cli.sock = fdpair[0];
1444         close(fdpair[1]);
1445
1446         status = winbindd_reinit_after_fork(child, child->logfilename);
1447
1448         nwritten = sys_write(state.cli.sock, &status, sizeof(status));
1449         if (nwritten != sizeof(status)) {
1450                 DEBUG(1, ("fork_domain_child: Could not write status: "
1451                           "nwritten=%d, error=%s\n", (int)nwritten,
1452                           strerror(errno)));
1453                 _exit(0);
1454         }
1455         if (!NT_STATUS_IS_OK(status)) {
1456                 DEBUG(1, ("winbindd_reinit_after_fork failed: %s\n",
1457                           nt_errstr(status)));
1458                 _exit(0);
1459         }
1460
1461         /* Handle online/offline messages. */
1462         messaging_register(winbind_messaging_context(), NULL,
1463                            MSG_WINBIND_OFFLINE, child_msg_offline);
1464         messaging_register(winbind_messaging_context(), NULL,
1465                            MSG_WINBIND_ONLINE, child_msg_online);
1466         messaging_register(winbind_messaging_context(), NULL,
1467                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1468         messaging_register(winbind_messaging_context(), NULL,
1469                            MSG_DEBUG, debug_message);
1470         messaging_register(winbind_messaging_context(), NULL,
1471                            MSG_WINBIND_IP_DROPPED,
1472                            winbind_msg_ip_dropped);
1473
1474
1475         primary_domain = find_our_domain();
1476
1477         if (primary_domain == NULL) {
1478                 smb_panic("no primary domain found");
1479         }
1480
1481         /* It doesn't matter if we allow cache login,
1482          * try to bring domain online after fork. */
1483         if ( child->domain ) {
1484                 child->domain->startup = True;
1485                 child->domain->startup_time = time_mono(NULL);
1486                 /* we can be in primary domain or in trusted domain
1487                  * If we are in trusted domain, set the primary domain
1488                  * in start-up mode */
1489                 if (!(child->domain->internal)) {
1490                         set_domain_online_request(child->domain);
1491                         if (!(child->domain->primary)) {
1492                                 primary_domain->startup = True;
1493                                 primary_domain->startup_time = time_mono(NULL);
1494                                 set_domain_online_request(primary_domain);
1495                         }
1496                 }
1497         }
1498
1499         /*
1500          * We are in idmap child, make sure that we set the
1501          * check_online_event to bring primary domain online.
1502          */
1503         if (child == idmap_child()) {
1504                 set_domain_online_request(primary_domain);
1505         }
1506
1507         /* We might be in the idmap child...*/
1508         if (child->domain && !(child->domain->internal) &&
1509             lp_winbind_offline_logon()) {
1510
1511                 set_domain_online_request(child->domain);
1512
1513                 if (primary_domain && (primary_domain != child->domain)) {
1514                         /* We need to talk to the primary
1515                          * domain as well as the trusted
1516                          * domain inside a trusted domain
1517                          * child.
1518                          * See the code in :
1519                          * set_dc_type_and_flags_trustinfo()
1520                          * for details.
1521                          */
1522                         set_domain_online_request(primary_domain);
1523                 }
1524
1525                 child->lockout_policy_event = tevent_add_timer(
1526                         winbind_event_context(), NULL, timeval_zero(),
1527                         account_lockout_policy_handler,
1528                         child);
1529         }
1530
1531         if (child->domain && child->domain->primary &&
1532             !USE_KERBEROS_KEYTAB &&
1533             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1534
1535                 struct timeval next_change;
1536
1537                 if (calculate_next_machine_pwd_change(child->domain->name,
1538                                                        &next_change)) {
1539                         child->machine_password_change_event = tevent_add_timer(
1540                                 winbind_event_context(), NULL, next_change,
1541                                 machine_password_change_handler,
1542                                 child);
1543                 }
1544         }
1545
1546         fde = tevent_add_fd(winbind_event_context(), NULL, state.cli.sock,
1547                             TEVENT_FD_READ, child_handler, &state);
1548         if (fde == NULL) {
1549                 DEBUG(1, ("tevent_add_fd failed\n"));
1550                 _exit(1);
1551         }
1552
1553         while (1) {
1554
1555                 int ret;
1556                 TALLOC_CTX *frame = talloc_stackframe();
1557
1558                 ret = tevent_loop_once(winbind_event_context());
1559                 if (ret != 0) {
1560                         DEBUG(1, ("tevent_loop_once failed: %s\n",
1561                                   strerror(errno)));
1562                         _exit(1);
1563                 }
1564
1565                 if (child->domain && child->domain->startup &&
1566                                 (time_mono(NULL) > child->domain->startup_time + 30)) {
1567                         /* No longer in "startup" mode. */
1568                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1569                                 child->domain->name ));
1570                         child->domain->startup = False;
1571                 }
1572
1573                 TALLOC_FREE(frame);
1574         }
1575 }
1576
1577 void winbind_msg_ip_dropped_parent(struct messaging_context *msg_ctx,
1578                                    void *private_data,
1579                                    uint32_t msg_type,
1580                                    struct server_id server_id,
1581                                    DATA_BLOB *data)
1582 {
1583         struct winbindd_child *child;
1584
1585         winbind_msg_ip_dropped(msg_ctx, private_data, msg_type,
1586                                server_id, data);
1587
1588
1589         for (child = winbindd_children; child != NULL; child = child->next) {
1590                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
1591                                    msg_type, data->data, data->length);
1592         }
1593 }