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
  42 #undef DBGC_CLASS
  43 #define DBGC_CLASS DBGC_WINBIND
  44
  45 extern bool override_logfile;
  46
  47 static struct winbindd_child *winbindd_children = NULL;
  48
  49 /* Read some data from a client connection */
  50
  51 static NTSTATUS child_read_request(int sock, struct winbindd_request *wreq)
  52 {
  53         NTSTATUS status;
  54
  55         status = read_data(sock, (char *)wreq, sizeof(*wreq));
  56         if (!NT_STATUS_IS_OK(status)) {
  57                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  58                           nt_errstr(status)));
  59                 return status;
  60         }
  61
  62         if (wreq->extra_len == 0) {
  63                 wreq->extra_data.data = NULL;
  64                 return NT_STATUS_OK;
  65         }
  66
  67         DEBUG(10, ("Need to read %d extra bytes\n", (int)wreq->extra_len));
  68
  69         wreq->extra_data.data = SMB_MALLOC_ARRAY(char, wreq->extra_len + 1);
  70         if (wreq->extra_data.data == NULL) {
  71                 DEBUG(0, ("malloc failed\n"));
  72                 return NT_STATUS_NO_MEMORY;
  73         }
  74
  75         /* Ensure null termination */
  76         wreq->extra_data.data[wreq->extra_len] = '\0';
  77
  78         status = read_data(sock, wreq->extra_data.data, wreq->extra_len);
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 DEBUG(0, ("Could not read extra data: %s\n",
  81                           nt_errstr(status)));
  82         }
  83         return status;
  84 }
  85
  86 static NTSTATUS child_write_response(int sock, struct winbindd_response *wrsp)
  87 {
  88         struct iovec iov[2];
  89         int iov_count;
  90
  91         iov[0].iov_base = (void *)wrsp;
  92         iov[0].iov_len = sizeof(struct winbindd_response);
  93         iov_count = 1;
  94
  95         if (wrsp->length > sizeof(struct winbindd_response)) {
  96                 iov[1].iov_base = (void *)wrsp->extra_data.data;
  97                 iov[1].iov_len = wrsp->length-iov[0].iov_len;
  98                 iov_count = 2;
  99         }
 100
 101         DEBUG(10, ("Writing %d bytes to parent\n", (int)wrsp->length));
 102
 103         if (write_data_iov(sock, iov, iov_count) != wrsp->length) {
 104                 DEBUG(0, ("Could not write result\n"));
 105                 return NT_STATUS_INVALID_HANDLE;
 106         }
 107
 108         return NT_STATUS_OK;
 109 }
 110
 111 /*
 112  * Do winbind child async request. This is not simply wb_simple_trans. We have
 113  * to do the queueing ourselves because while a request is queued, the child
 114  * might have crashed, and we have to re-fork it in the _trigger function.
 115  */
 116
 117 struct wb_child_request_state {
 118         struct tevent_context *ev;
 119         struct winbindd_child *child;
 120         struct winbindd_request *request;
 121         struct winbindd_response *response;
 122 };
 123
 124 static bool fork_domain_child(struct winbindd_child *child);
 125
 126 static void wb_child_request_trigger(struct tevent_req *req,
 127                                             void *private_data);
 128 static void wb_child_request_done(struct tevent_req *subreq);
 129
 130 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
 131                                          struct tevent_context *ev,
 132                                          struct winbindd_child *child,
 133                                          struct winbindd_request *request)
 134 {
 135         struct tevent_req *req;
 136         struct wb_child_request_state *state;
 137
 138         req = tevent_req_create(mem_ctx, &state,
 139                                 struct wb_child_request_state);
 140         if (req == NULL) {
 141                 return NULL;
 142         }
 143
 144         state->ev = ev;
 145         state->child = child;
 146         state->request = request;
 147
 148         if (!tevent_queue_add(child->queue, ev, req,
 149                               wb_child_request_trigger, NULL)) {
 150                 tevent_req_oom(req);
 151                 return tevent_req_post(req, ev);
 152         }
 153         return req;
 154 }
 155
 156 static void wb_child_request_trigger(struct tevent_req *req,
 157                                      void *private_data)
 158 {
 159         struct wb_child_request_state *state = tevent_req_data(
 160                 req, struct wb_child_request_state);
 161         struct tevent_req *subreq;
 162
 163         if ((state->child->sock == -1) && (!fork_domain_child(state->child))) {
 164                 tevent_req_error(req, errno);
 165                 return;
 166         }
 167
 168         subreq = wb_simple_trans_send(state, winbind_event_context(), NULL,
 169                                       state->child->sock, state->request);
 170         if (tevent_req_nomem(subreq, req)) {
 171                 return;
 172         }
 173         tevent_req_set_callback(subreq, wb_child_request_done, req);
 174         tevent_req_set_endtime(req, state->ev, timeval_current_ofs(300, 0));
 175 }
 176
 177 static void wb_child_request_done(struct tevent_req *subreq)
 178 {
 179         struct tevent_req *req = tevent_req_callback_data(
 180                 subreq, struct tevent_req);
 181         struct wb_child_request_state *state = tevent_req_data(
 182                 req, struct wb_child_request_state);
 183         int ret, err;
 184
 185         ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
 186         TALLOC_FREE(subreq);
 187         if (ret == -1) {
 188                 /*
 189                  * The basic parent/child communication broke, close
 190                  * our socket
 191                  */
 192                 close(state->child->sock);
 193                 state->child->sock = -1;
 194                 DLIST_REMOVE(winbindd_children, state->child);
 195                 tevent_req_error(req, err);
 196                 return;
 197         }
 198         tevent_req_done(req);
 199 }
 200
 201 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 202                           struct winbindd_response **presponse, int *err)
 203 {
 204         struct wb_child_request_state *state = tevent_req_data(
 205                 req, struct wb_child_request_state);
 206
 207         if (tevent_req_is_unix_error(req, err)) {
 208                 return -1;
 209         }
 210         *presponse = talloc_move(mem_ctx, &state->response);
 211         return 0;
 212 }
 213
 214 static bool winbindd_child_busy(struct winbindd_child *child)
 215 {
 216         return tevent_queue_length(child->queue) > 0;
 217 }
 218
 219 static struct winbindd_child *find_idle_child(struct winbindd_domain *domain)
 220 {
 221         int i;
 222
 223         for (i=0; i<lp_winbind_max_domain_connections(); i++) {
 224                 if (!winbindd_child_busy(&domain->children[i])) {
 225                         return &domain->children[i];
 226                 }
 227         }
 228
 229         return NULL;
 230 }
 231
 232 struct winbindd_child *choose_domain_child(struct winbindd_domain *domain)
 233 {
 234         struct winbindd_child *result;
 235
 236         result = find_idle_child(domain);
 237         if (result != NULL) {
 238                 return result;
 239         }
 240         return &domain->children[rand() % lp_winbind_max_domain_connections()];
 241 }
 242
 243 struct dcerpc_binding_handle *dom_child_handle(struct winbindd_domain *domain)
 244 {
 245         struct winbindd_child *child;
 246
 247         child = choose_domain_child(domain);
 248         return child->binding_handle;
 249 }
 250
 251 struct wb_domain_request_state {
 252         struct tevent_context *ev;
 253         struct winbindd_domain *domain;
 254         struct winbindd_child *child;
 255         struct winbindd_request *request;
 256         struct winbindd_request *init_req;
 257         struct winbindd_response *response;
 258 };
 259
 260 static void wb_domain_request_gotdc(struct tevent_req *subreq);
 261 static void wb_domain_request_initialized(struct tevent_req *subreq);
 262 static void wb_domain_request_done(struct tevent_req *subreq);
 263
 264 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
 265                                           struct tevent_context *ev,
 266                                           struct winbindd_domain *domain,
 267                                           struct winbindd_request *request)
 268 {
 269         struct tevent_req *req, *subreq;
 270         struct wb_domain_request_state *state;
 271
 272         req = tevent_req_create(mem_ctx, &state,
 273                                 struct wb_domain_request_state);
 274         if (req == NULL) {
 275                 return NULL;
 276         }
 277
 278         state->child = choose_domain_child(domain);
 279
 280         if (domain->initialized) {
 281                 subreq = wb_child_request_send(state, ev, state->child,
 282                                                request);
 283                 if (tevent_req_nomem(subreq, req)) {
 284                         return tevent_req_post(req, ev);
 285                 }
 286                 tevent_req_set_callback(subreq, wb_domain_request_done, req);
 287                 return req;
 288         }
 289
 290         state->domain = domain;
 291         state->ev = ev;
 292         state->request = request;
 293
 294         state->init_req = talloc_zero(state, struct winbindd_request);
 295         if (tevent_req_nomem(state->init_req, req)) {
 296                 return tevent_req_post(req, ev);
 297         }
 298
 299         if (IS_DC || domain->primary || domain->internal) {
 300                 /* The primary domain has to find the DC name itself */
 301                 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 302                 fstrcpy(state->init_req->domain_name, domain->name);
 303                 state->init_req->data.init_conn.is_primary = domain->primary;
 304                 fstrcpy(state->init_req->data.init_conn.dcname, "");
 305
 306                 subreq = wb_child_request_send(state, ev, state->child,
 307                                                state->init_req);
 308                 if (tevent_req_nomem(subreq, req)) {
 309                         return tevent_req_post(req, ev);
 310                 }
 311                 tevent_req_set_callback(subreq, wb_domain_request_initialized,
 312                                         req);
 313                 return req;
 314         }
 315
 316         /*
 317          * Ask our DC for a DC name
 318          */
 319         domain = find_our_domain();
 320
 321         /* This is *not* the primary domain, let's ask our DC about a DC
 322          * name */
 323
 324         state->init_req->cmd = WINBINDD_GETDCNAME;
 325         fstrcpy(state->init_req->domain_name, domain->name);
 326
 327         subreq = wb_child_request_send(state, ev, state->child, request);
 328         if (tevent_req_nomem(subreq, req)) {
 329                 return tevent_req_post(req, ev);
 330         }
 331         tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
 332         return req;
 333 }
 334
 335 static void wb_domain_request_gotdc(struct tevent_req *subreq)
 336 {
 337         struct tevent_req *req = tevent_req_callback_data(
 338                 subreq, struct tevent_req);
 339         struct wb_domain_request_state *state = tevent_req_data(
 340                 req, struct wb_domain_request_state);
 341         struct winbindd_response *response;
 342         int ret, err;
 343
 344         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 345         TALLOC_FREE(subreq);
 346         if (ret == -1) {
 347                 tevent_req_error(req, err);
 348                 return;
 349         }
 350         state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 351         fstrcpy(state->init_req->domain_name, state->domain->name);
 352         state->init_req->data.init_conn.is_primary = False;
 353         fstrcpy(state->init_req->data.init_conn.dcname,
 354                 response->data.dc_name);
 355
 356         TALLOC_FREE(response);
 357
 358         subreq = wb_child_request_send(state, state->ev, state->child,
 359                                        state->init_req);
 360         if (tevent_req_nomem(subreq, req)) {
 361                 return;
 362         }
 363         tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
 364 }
 365
 366 static void wb_domain_request_initialized(struct tevent_req *subreq)
 367 {
 368         struct tevent_req *req = tevent_req_callback_data(
 369                 subreq, struct tevent_req);
 370         struct wb_domain_request_state *state = tevent_req_data(
 371                 req, struct wb_domain_request_state);
 372         struct winbindd_response *response;
 373         int ret, err;
 374
 375         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 376         TALLOC_FREE(subreq);
 377         if (ret == -1) {
 378                 tevent_req_error(req, err);
 379                 return;
 380         }
 381
 382         if (!string_to_sid(&state->domain->sid,
 383                            response->data.domain_info.sid)) {
 384                 DEBUG(1,("init_child_recv: Could not convert sid %s "
 385                         "from string\n", response->data.domain_info.sid));
 386                 tevent_req_error(req, EINVAL);
 387                 return;
 388         }
 389
 390         talloc_free(state->domain->name);
 391         state->domain->name = talloc_strdup(state->domain,
 392                                             response->data.domain_info.name);
 393         if (state->domain->name == NULL) {
 394                 tevent_req_error(req, ENOMEM);
 395                 return;
 396         }
 397
 398         if (response->data.domain_info.alt_name[0] != '\0') {
 399                 talloc_free(state->domain->alt_name);
 400
 401                 state->domain->alt_name = talloc_strdup(state->domain,
 402                                 response->data.domain_info.alt_name);
 403                 if (state->domain->alt_name == NULL) {
 404                         tevent_req_error(req, ENOMEM);
 405                         return;
 406                 }
 407         }
 408
 409         state->domain->native_mode = response->data.domain_info.native_mode;
 410         state->domain->active_directory =
 411                 response->data.domain_info.active_directory;
 412         state->domain->initialized = true;
 413
 414         TALLOC_FREE(response);
 415
 416         subreq = wb_child_request_send(state, state->ev, state->child,
 417                                        state->request);
 418         if (tevent_req_nomem(subreq, req)) {
 419                 return;
 420         }
 421         tevent_req_set_callback(subreq, wb_domain_request_done, req);
 422 }
 423
 424 static void wb_domain_request_done(struct tevent_req *subreq)
 425 {
 426         struct tevent_req *req = tevent_req_callback_data(
 427                 subreq, struct tevent_req);
 428         struct wb_domain_request_state *state = tevent_req_data(
 429                 req, struct wb_domain_request_state);
 430         int ret, err;
 431
 432         ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
 433                                     &err);
 434         TALLOC_FREE(subreq);
 435         if (ret == -1) {
 436                 tevent_req_error(req, err);
 437                 return;
 438         }
 439         tevent_req_done(req);
 440 }
 441
 442 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 443                            struct winbindd_response **presponse, int *err)
 444 {
 445         struct wb_domain_request_state *state = tevent_req_data(
 446                 req, struct wb_domain_request_state);
 447
 448         if (tevent_req_is_unix_error(req, err)) {
 449                 return -1;
 450         }
 451         *presponse = talloc_move(mem_ctx, &state->response);
 452         return 0;
 453 }
 454
 455 static void child_process_request(struct winbindd_child *child,
 456                                   struct winbindd_cli_state *state)
 457 {
 458         struct winbindd_domain *domain = child->domain;
 459         const struct winbindd_child_dispatch_table *table = child->table;
 460
 461         /* Free response data - we may be interrupted and receive another
 462            command before being able to send this data off. */
 463
 464         state->response->result = WINBINDD_ERROR;
 465         state->response->length = sizeof(struct winbindd_response);
 466
 467         /* as all requests in the child are sync, we can use talloc_tos() */
 468         state->mem_ctx = talloc_tos();
 469
 470         /* Process command */
 471
 472         for (; table->name; table++) {
 473                 if (state->request->cmd == table->struct_cmd) {
 474                         DEBUG(10,("child_process_request: request fn %s\n",
 475                                   table->name));
 476                         state->response->result = table->struct_fn(domain, state);
 477                         return;
 478                 }
 479         }
 480
 481         DEBUG(1, ("child_process_request: unknown request fn number %d\n",
 482                   (int)state->request->cmd));
 483         state->response->result = WINBINDD_ERROR;
 484 }
 485
 486 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 487                  const struct winbindd_child_dispatch_table *table,
 488                  const char *logprefix,
 489                  const char *logname)
 490 {
 491         if (logprefix && logname) {
 492                 char *logbase = NULL;
 493
 494                 if (*lp_logfile(talloc_tos())) {
 495                         char *end = NULL;
 496
 497                         if (asprintf(&logbase, "%s", lp_logfile(talloc_tos())) < 0) {
 498                                 smb_panic("Internal error: asprintf failed");
 499                         }
 500
 501                         if ((end = strrchr_m(logbase, '/'))) {
 502                                 *end = '\0';
 503                         }
 504                 } else {
 505                         if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
 506                                 smb_panic("Internal error: asprintf failed");
 507                         }
 508                 }
 509
 510                 if (asprintf(&child->logfilename, "%s/%s-%s",
 511                              logbase, logprefix, logname) < 0) {
 512                         SAFE_FREE(logbase);
 513                         smb_panic("Internal error: asprintf failed");
 514                 }
 515
 516                 SAFE_FREE(logbase);
 517         } else {
 518                 smb_panic("Internal error: logprefix == NULL && "
 519                           "logname == NULL");
 520         }
 521
 522         child->sock = -1;
 523         child->domain = domain;
 524         child->table = table;
 525         child->queue = tevent_queue_create(NULL, "winbind_child");
 526         SMB_ASSERT(child->queue != NULL);
 527         child->binding_handle = wbint_binding_handle(NULL, domain, child);
 528         SMB_ASSERT(child->binding_handle != NULL);
 529 }
 530
 531 void winbind_child_died(pid_t pid)
 532 {
 533         struct winbindd_child *child;
 534
 535         for (child = winbindd_children; child != NULL; child = child->next) {
 536                 if (child->pid == pid) {
 537                         break;
 538                 }
 539         }
 540
 541         if (child == NULL) {
 542                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 543                 return;
 544         }
 545
 546         /* This will be re-added in fork_domain_child() */
 547
 548         DLIST_REMOVE(winbindd_children, child);
 549         child->pid = 0;
 550
 551         if (child->sock != -1) {
 552                 close(child->sock);
 553                 child->sock = -1;
 554         }
 555 }
 556
 557 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 558
 559 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 560 {
 561         flush_negative_conn_cache_for_domain(domain->name);
 562         if (domain->alt_name != NULL) {
 563                 flush_negative_conn_cache_for_domain(domain->alt_name);
 564         }
 565 }
 566
 567 /*
 568  * Parent winbindd process sets its own debug level first and then
 569  * sends a message to all the winbindd children to adjust their debug
 570  * level to that of parents.
 571  */
 572
 573 void winbind_msg_debug(struct messaging_context *msg_ctx,
 574                          void *private_data,
 575                          uint32_t msg_type,
 576                          struct server_id server_id,
 577                          DATA_BLOB *data)
 578 {
 579         struct winbindd_child *child;
 580
 581         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 582
 583         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 584
 585         for (child = winbindd_children; child != NULL; child = child->next) {
 586
 587                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 588                         (unsigned int)child->pid));
 589
 590                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 591                            MSG_DEBUG,
 592                            data->data,
 593                            strlen((char *) data->data) + 1);
 594         }
 595 }
 596
 597 /* Set our domains as offline and forward the offline message to our children. */
 598
 599 void winbind_msg_offline(struct messaging_context *msg_ctx,
 600                          void *private_data,
 601                          uint32_t msg_type,
 602                          struct server_id server_id,
 603                          DATA_BLOB *data)
 604 {
 605         struct winbindd_child *child;
 606         struct winbindd_domain *domain;
 607
 608         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 609
 610         if (!lp_winbind_offline_logon()) {
 611                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 612                 return;
 613         }
 614
 615         /* Set our global state as offline. */
 616         if (!set_global_winbindd_state_offline()) {
 617                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 618                 return;
 619         }
 620
 621         /* Set all our domains as offline. */
 622         for (domain = domain_list(); domain; domain = domain->next) {
 623                 if (domain->internal) {
 624                         continue;
 625                 }
 626                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 627                 set_domain_offline(domain);
 628         }
 629
 630         for (child = winbindd_children; child != NULL; child = child->next) {
 631                 /* Don't send message to internal children.  We've already
 632                    done so above. */
 633                 if (!child->domain || winbindd_internal_child(child)) {
 634                         continue;
 635                 }
 636
 637                 /* Or internal domains (this should not be possible....) */
 638                 if (child->domain->internal) {
 639                         continue;
 640                 }
 641
 642                 /* Each winbindd child should only process requests for one domain - make sure
 643                    we only set it online / offline for that domain. */
 644
 645                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 646                         (unsigned int)child->pid, child->domain->name ));
 647
 648                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 649                                    MSG_WINBIND_OFFLINE,
 650                                    (const uint8_t *)child->domain->name,
 651                                    strlen(child->domain->name)+1);
 652         }
 653 }
 654
 655 /* Set our domains as online and forward the online message to our children. */
 656
 657 void winbind_msg_online(struct messaging_context *msg_ctx,
 658                         void *private_data,
 659                         uint32_t msg_type,
 660                         struct server_id server_id,
 661                         DATA_BLOB *data)
 662 {
 663         struct winbindd_child *child;
 664         struct winbindd_domain *domain;
 665
 666         DEBUG(10,("winbind_msg_online: got online message.\n"));
 667
 668         if (!lp_winbind_offline_logon()) {
 669                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 670                 return;
 671         }
 672
 673         /* Set our global state as online. */
 674         set_global_winbindd_state_online();
 675
 676         smb_nscd_flush_user_cache();
 677         smb_nscd_flush_group_cache();
 678
 679         /* Set all our domains as online. */
 680         for (domain = domain_list(); domain; domain = domain->next) {
 681                 if (domain->internal) {
 682                         continue;
 683                 }
 684                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 685
 686                 winbindd_flush_negative_conn_cache(domain);
 687                 set_domain_online_request(domain);
 688
 689                 /* Send an online message to the idmap child when our
 690                    primary domain comes back online */
 691
 692                 if ( domain->primary ) {
 693                         struct winbindd_child *idmap = idmap_child();
 694
 695                         if ( idmap->pid != 0 ) {
 696                                 messaging_send_buf(msg_ctx,
 697                                                    pid_to_procid(idmap->pid),
 698                                                    MSG_WINBIND_ONLINE,
 699                                                    (const uint8_t *)domain->name,
 700                                                    strlen(domain->name)+1);
 701                         }
 702                 }
 703         }
 704
 705         for (child = winbindd_children; child != NULL; child = child->next) {
 706                 /* Don't send message to internal childs. */
 707                 if (!child->domain || winbindd_internal_child(child)) {
 708                         continue;
 709                 }
 710
 711                 /* Or internal domains (this should not be possible....) */
 712                 if (child->domain->internal) {
 713                         continue;
 714                 }
 715
 716                 /* Each winbindd child should only process requests for one domain - make sure
 717                    we only set it online / offline for that domain. */
 718
 719                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 720                         (unsigned int)child->pid, child->domain->name ));
 721
 722                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 723                                    MSG_WINBIND_ONLINE,
 724                                    (const uint8_t *)child->domain->name,
 725                                    strlen(child->domain->name)+1);
 726         }
 727 }
 728
 729 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 730 {
 731         struct winbindd_domain *domain;
 732         char *buf = NULL;
 733
 734         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 735                                    get_global_winbindd_state_offline() ?
 736                                    "Offline":"Online")) == NULL) {
 737                 return NULL;
 738         }
 739
 740         for (domain = domain_list(); domain; domain = domain->next) {
 741                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 742                                                   domain->name,
 743                                                   domain->online ?
 744                                                   "Online":"Offline")) == NULL) {
 745                         return NULL;
 746                 }
 747         }
 748
 749         buf = talloc_asprintf_append_buffer(buf, "\n");
 750
 751         DEBUG(5,("collect_onlinestatus: %s", buf));
 752
 753         return buf;
 754 }
 755
 756 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 757                               void *private_data,
 758                               uint32_t msg_type,
 759                               struct server_id server_id,
 760                               DATA_BLOB *data)
 761 {
 762         TALLOC_CTX *mem_ctx;
 763         const char *message;
 764         struct server_id *sender;
 765
 766         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 767
 768         if (!data->data) {
 769                 return;
 770         }
 771
 772         sender = (struct server_id *)data->data;
 773
 774         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 775         if (mem_ctx == NULL) {
 776                 return;
 777         }
 778
 779         message = collect_onlinestatus(mem_ctx);
 780         if (message == NULL) {
 781                 talloc_destroy(mem_ctx);
 782                 return;
 783         }
 784
 785         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 786                            (const uint8 *)message, strlen(message) + 1);
 787
 788         talloc_destroy(mem_ctx);
 789 }
 790
 791 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 792                                  void *private_data,
 793                                  uint32_t msg_type,
 794                                  struct server_id server_id,
 795                                  DATA_BLOB *data)
 796 {
 797         struct winbindd_child *child;
 798
 799         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 800
 801         dump_event_list(winbind_event_context());
 802
 803         for (child = winbindd_children; child != NULL; child = child->next) {
 804
 805                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 806                         (unsigned int)child->pid));
 807
 808                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 809                                    MSG_DUMP_EVENT_LIST,
 810                                    NULL, 0);
 811         }
 812
 813 }
 814
 815 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 816                                   void *private_data,
 817                                   uint32_t msg_type,
 818                                   struct server_id server_id,
 819                                   DATA_BLOB *data)
 820 {
 821         TALLOC_CTX *mem_ctx;
 822         const char *message = NULL;
 823         struct server_id *sender = NULL;
 824         const char *domain = NULL;
 825         char *s = NULL;
 826         NTSTATUS status;
 827         struct winbindd_domain *dom = NULL;
 828
 829         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 830
 831         if (!data || !data->data) {
 832                 return;
 833         }
 834
 835         if (data->length < sizeof(struct server_id)) {
 836                 return;
 837         }
 838
 839         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 840         if (!mem_ctx) {
 841                 return;
 842         }
 843
 844         sender = (struct server_id *)data->data;
 845         if (data->length > sizeof(struct server_id)) {
 846                 domain = (const char *)data->data+sizeof(struct server_id);
 847         }
 848
 849         if (domain) {
 850
 851                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 852                         domain));
 853
 854                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 855                                                   find_domain_from_name_noinit(domain));
 856                 if (!message) {
 857                         talloc_destroy(mem_ctx);
 858                         return;
 859                 }
 860
 861                 messaging_send_buf(msg_ctx, *sender,
 862                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 863                                    (const uint8_t *)message, strlen(message) + 1);
 864
 865                 talloc_destroy(mem_ctx);
 866
 867                 return;
 868         }
 869
 870         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 871
 872         for (dom = domain_list(); dom; dom=dom->next) {
 873                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 874                 if (!message) {
 875                         talloc_destroy(mem_ctx);
 876                         return;
 877                 }
 878
 879                 s = talloc_asprintf_append(s, "%s\n", message);
 880                 if (!s) {
 881                         talloc_destroy(mem_ctx);
 882                         return;
 883                 }
 884         }
 885
 886         status = messaging_send_buf(msg_ctx, *sender,
 887                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 888                                     (uint8_t *)s, strlen(s) + 1);
 889         if (!NT_STATUS_IS_OK(status)) {
 890                 DEBUG(0,("failed to send message: %s\n",
 891                 nt_errstr(status)));
 892         }
 893
 894         talloc_destroy(mem_ctx);
 895 }
 896
 897 static void account_lockout_policy_handler(struct tevent_context *ctx,
 898                                            struct tevent_timer *te,
 899                                            struct timeval now,
 900                                            void *private_data)
 901 {
 902         struct winbindd_child *child =
 903                 (struct winbindd_child *)private_data;
 904         TALLOC_CTX *mem_ctx = NULL;
 905         struct winbindd_methods *methods;
 906         struct samr_DomInfo12 lockout_policy;
 907         NTSTATUS result;
 908
 909         DEBUG(10,("account_lockout_policy_handler called\n"));
 910
 911         TALLOC_FREE(child->lockout_policy_event);
 912
 913         if ( !winbindd_can_contact_domain( child->domain ) ) {
 914                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 915                           "do not have an incoming trust to domain %s\n",
 916                           child->domain->name));
 917
 918                 return;
 919         }
 920
 921         methods = child->domain->methods;
 922
 923         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 924         if (!mem_ctx) {
 925                 result = NT_STATUS_NO_MEMORY;
 926         } else {
 927                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 928         }
 929         TALLOC_FREE(mem_ctx);
 930
 931         if (!NT_STATUS_IS_OK(result)) {
 932                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 933                          nt_errstr(result)));
 934         }
 935
 936         child->lockout_policy_event = tevent_add_timer(winbind_event_context(), NULL,
 937                                                       timeval_current_ofs(3600, 0),
 938                                                       account_lockout_policy_handler,
 939                                                       child);
 940 }
 941
 942 static time_t get_machine_password_timeout(void)
 943 {
 944         /* until we have gpo support use lp setting */
 945         return lp_machine_password_timeout();
 946 }
 947
 948 static bool calculate_next_machine_pwd_change(const char *domain,
 949                                               struct timeval *t)
 950 {
 951         time_t pass_last_set_time;
 952         time_t timeout;
 953         time_t next_change;
 954         struct timeval tv;
 955         char *pw;
 956
 957         pw = secrets_fetch_machine_password(domain,
 958                                             &pass_last_set_time,
 959                                             NULL);
 960
 961         if (pw == NULL) {
 962                 DEBUG(0,("cannot fetch own machine password ????"));
 963                 return false;
 964         }
 965
 966         SAFE_FREE(pw);
 967
 968         timeout = get_machine_password_timeout();
 969         if (timeout == 0) {
 970                 DEBUG(10,("machine password never expires\n"));
 971                 return false;
 972         }
 973
 974         tv.tv_sec = pass_last_set_time;
 975         DEBUG(10, ("password last changed %s\n",
 976                    timeval_string(talloc_tos(), &tv, false)));
 977         tv.tv_sec += timeout;
 978         DEBUGADD(10, ("password valid until %s\n",
 979                       timeval_string(talloc_tos(), &tv, false)));
 980
 981         if (time(NULL) < (pass_last_set_time + timeout)) {
 982                 next_change = pass_last_set_time + timeout;
 983                 DEBUG(10,("machine password still valid until: %s\n",
 984                         http_timestring(talloc_tos(), next_change)));
 985                 *t = timeval_set(next_change, 0);
 986
 987                 if (lp_clustering()) {
 988                         uint8_t randbuf;
 989                         /*
 990                          * When having a cluster, we have several
 991                          * winbinds racing for the password change. In
 992                          * the machine_password_change_handler()
 993                          * function we check if someone else was
 994                          * faster when the event triggers. We add a
 995                          * 255-second random delay here, so that we
 996                          * don't run to change the password at the
 997                          * exact same moment.
 998                          */
 999                         generate_random_buffer(&randbuf, sizeof(randbuf));
1000                         DEBUG(10, ("adding %d seconds randomness\n",
1001                                    (int)randbuf));
1002                         t->tv_sec += randbuf;
1003                 }
1004                 return true;
1005         }
1006
1007         DEBUG(10,("machine password expired, needs immediate change\n"));
1008
1009         *t = timeval_zero();
1010
1011         return true;
1012 }
1013
1014 static void machine_password_change_handler(struct tevent_context *ctx,
1015                                             struct tevent_timer *te,
1016                                             struct timeval now,
1017                                             void *private_data)
1018 {
1019         struct messaging_context *msg_ctx = winbind_messaging_context();
1020         struct winbindd_child *child =
1021                 (struct winbindd_child *)private_data;
1022         struct rpc_pipe_client *netlogon_pipe = NULL;
1023         NTSTATUS result;
1024         struct timeval next_change;
1025
1026         DEBUG(10,("machine_password_change_handler called\n"));
1027
1028         TALLOC_FREE(child->machine_password_change_event);
1029
1030         if (!calculate_next_machine_pwd_change(child->domain->name,
1031                                                &next_change)) {
1032                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1033                 return;
1034         }
1035
1036         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1037                    timeval_string(talloc_tos(), &next_change, false)));
1038
1039         if (!timeval_expired(&next_change)) {
1040                 DEBUG(10, ("Someone else has already changed the pw\n"));
1041                 goto done;
1042         }
1043
1044         if (!winbindd_can_contact_domain(child->domain)) {
1045                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
1046                           "do not have an incoming trust to domain %s\n",
1047                           child->domain->name));
1048                 return;
1049         }
1050
1051         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
1052         if (!NT_STATUS_IS_OK(result)) {
1053                 DEBUG(10,("machine_password_change_handler: "
1054                         "failed to connect netlogon pipe: %s\n",
1055                          nt_errstr(result)));
1056                 return;
1057         }
1058
1059         result = trust_pw_change(child->domain->conn.netlogon_creds,
1060                                  msg_ctx,
1061                                  netlogon_pipe->binding_handle,
1062                                  child->domain->name,
1063                                  false); /* force */
1064
1065         DEBUG(10, ("machine_password_change_handler: "
1066                    "trust_pw_change returned %s\n",
1067                    nt_errstr(result)));
1068
1069         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
1070                 DEBUG(3,("machine_password_change_handler: password set returned "
1071                          "ACCESS_DENIED.  Maybe the trust account "
1072                          "password was changed and we didn't know it. "
1073                          "Killing connections to domain %s\n",
1074                          child->domain->name));
1075                 invalidate_cm_connection(&child->domain->conn);
1076         }
1077
1078         if (!calculate_next_machine_pwd_change(child->domain->name,
1079                                                &next_change)) {
1080                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1081                 return;
1082         }
1083
1084         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1085                    timeval_string(talloc_tos(), &next_change, false)));
1086
1087         if (!NT_STATUS_IS_OK(result)) {
1088                 struct timeval tmp;
1089                 /*
1090                  * In case of failure, give the DC a minute to recover
1091                  */
1092                 tmp = timeval_current_ofs(60, 0);
1093                 next_change = timeval_max(&next_change, &tmp);
1094         }
1095
1096 done:
1097         child->machine_password_change_event = tevent_add_timer(winbind_event_context(), NULL,
1098                                                               next_change,
1099                                                               machine_password_change_handler,
1100                                                               child);
1101 }
1102
1103 /* Deal with a request to go offline. */
1104
1105 static void child_msg_offline(struct messaging_context *msg,
1106                               void *private_data,
1107                               uint32_t msg_type,
1108                               struct server_id server_id,
1109                               DATA_BLOB *data)
1110 {
1111         struct winbindd_domain *domain;
1112         struct winbindd_domain *primary_domain = NULL;
1113         const char *domainname = (const char *)data->data;
1114
1115         if (data->data == NULL || data->length == 0) {
1116                 return;
1117         }
1118
1119         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1120
1121         if (!lp_winbind_offline_logon()) {
1122                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1123                 return;
1124         }
1125
1126         primary_domain = find_our_domain();
1127
1128         /* Mark the requested domain offline. */
1129
1130         for (domain = domain_list(); domain; domain = domain->next) {
1131                 if (domain->internal) {
1132                         continue;
1133                 }
1134                 if (strequal(domain->name, domainname)) {
1135                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1136                         set_domain_offline(domain);
1137                         /* we are in the trusted domain, set the primary domain
1138                          * offline too */
1139                         if (domain != primary_domain) {
1140                                 set_domain_offline(primary_domain);
1141                         }
1142                 }
1143         }
1144 }
1145
1146 /* Deal with a request to go online. */
1147
1148 static void child_msg_online(struct messaging_context *msg,
1149                              void *private_data,
1150                              uint32_t msg_type,
1151                              struct server_id server_id,
1152                              DATA_BLOB *data)
1153 {
1154         struct winbindd_domain *domain;
1155         struct winbindd_domain *primary_domain = NULL;
1156         const char *domainname = (const char *)data->data;
1157
1158         if (data->data == NULL || data->length == 0) {
1159                 return;
1160         }
1161
1162         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1163
1164         if (!lp_winbind_offline_logon()) {
1165                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1166                 return;
1167         }
1168
1169         primary_domain = find_our_domain();
1170
1171         /* Set our global state as online. */
1172         set_global_winbindd_state_online();
1173
1174         /* Try and mark everything online - delete any negative cache entries
1175            to force a reconnect now. */
1176
1177         for (domain = domain_list(); domain; domain = domain->next) {
1178                 if (domain->internal) {
1179                         continue;
1180                 }
1181                 if (strequal(domain->name, domainname)) {
1182                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1183                         winbindd_flush_negative_conn_cache(domain);
1184                         set_domain_online_request(domain);
1185
1186                         /* we can be in trusted domain, which will contact primary domain
1187                          * we have to bring primary domain online in trusted domain process
1188                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1189                          * --> contact_domain = find_our_domain()
1190                          * */
1191                         if (domain != primary_domain) {
1192                                 winbindd_flush_negative_conn_cache(primary_domain);
1193                                 set_domain_online_request(primary_domain);
1194                         }
1195                 }
1196         }
1197 }
1198
1199 static void child_msg_dump_event_list(struct messaging_context *msg,
1200                                       void *private_data,
1201                                       uint32_t msg_type,
1202                                       struct server_id server_id,
1203                                       DATA_BLOB *data)
1204 {
1205         DEBUG(5,("child_msg_dump_event_list received\n"));
1206
1207         dump_event_list(winbind_event_context());
1208 }
1209
1210 NTSTATUS winbindd_reinit_after_fork(const struct winbindd_child *myself,
1211                                     const char *logfilename)
1212 {
1213         struct winbindd_domain *domain;
1214         struct winbindd_child *cl;
1215         NTSTATUS status;
1216
1217         status = reinit_after_fork(
1218                 winbind_messaging_context(),
1219                 winbind_event_context(),
1220                 true);
1221         if (!NT_STATUS_IS_OK(status)) {
1222                 DEBUG(0,("reinit_after_fork() failed\n"));
1223                 return status;
1224         }
1225
1226         close_conns_after_fork();
1227
1228         if (!override_logfile && logfilename) {
1229                 lp_set_logfile(logfilename);
1230                 reopen_logs();
1231         }
1232
1233         if (!winbindd_setup_sig_term_handler(false))
1234                 return NT_STATUS_NO_MEMORY;
1235         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1236                                             logfilename))
1237                 return NT_STATUS_NO_MEMORY;
1238
1239         /* Stop zombies in children */
1240         CatchChild();
1241
1242         /* Don't handle the same messages as our parent. */
1243         messaging_deregister(winbind_messaging_context(),
1244                              MSG_SMB_CONF_UPDATED, NULL);
1245         messaging_deregister(winbind_messaging_context(),
1246                              MSG_SHUTDOWN, NULL);
1247         messaging_deregister(winbind_messaging_context(),
1248                              MSG_WINBIND_OFFLINE, NULL);
1249         messaging_deregister(winbind_messaging_context(),
1250                              MSG_WINBIND_ONLINE, NULL);
1251         messaging_deregister(winbind_messaging_context(),
1252                              MSG_WINBIND_ONLINESTATUS, NULL);
1253         messaging_deregister(winbind_messaging_context(),
1254                              MSG_DUMP_EVENT_LIST, NULL);
1255         messaging_deregister(winbind_messaging_context(),
1256                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1257         messaging_deregister(winbind_messaging_context(),
1258                              MSG_DEBUG, NULL);
1259
1260         messaging_deregister(winbind_messaging_context(),
1261                              MSG_WINBIND_DOMAIN_OFFLINE, NULL);
1262         messaging_deregister(winbind_messaging_context(),
1263                              MSG_WINBIND_DOMAIN_ONLINE, NULL);
1264
1265         /* We have destroyed all events in the winbindd_event_context
1266          * in reinit_after_fork(), so clean out all possible pending
1267          * event pointers. */
1268
1269         /* Deal with check_online_events. */
1270
1271         for (domain = domain_list(); domain; domain = domain->next) {
1272                 TALLOC_FREE(domain->check_online_event);
1273         }
1274
1275         /* Ensure we're not handling a credential cache event inherited
1276          * from our parent. */
1277
1278         ccache_remove_all_after_fork();
1279
1280         /* Destroy all possible events in child list. */
1281         for (cl = winbindd_children; cl != NULL; cl = cl->next) {
1282                 TALLOC_FREE(cl->lockout_policy_event);
1283                 TALLOC_FREE(cl->machine_password_change_event);
1284
1285                 /* Children should never be able to send
1286                  * each other messages, all messages must
1287                  * go through the parent.
1288                  */
1289                 cl->pid = (pid_t)0;
1290
1291                 /*
1292                  * Close service sockets to all other children
1293                  */
1294                 if ((cl != myself) && (cl->sock != -1)) {
1295                         close(cl->sock);
1296                         cl->sock = -1;
1297                 }
1298         }
1299         /*
1300          * This is a little tricky, children must not
1301          * send an MSG_WINBIND_ONLINE message to idmap_child().
1302          * If we are in a child of our primary domain or
1303          * in the process created by fork_child_dc_connect(),
1304          * and the primary domain cannot go online,
1305          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1306          * periodically to idmap_child().
1307          *
1308          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1309          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1310          * ---> init_dc_connection() ---> cm_open_connection --->
1311          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1312          * idmap_child(). Disallow children sending messages
1313          * to each other, all messages must go through the parent.
1314          */
1315         cl = idmap_child();
1316         cl->pid = (pid_t)0;
1317
1318         return NT_STATUS_OK;
1319 }
1320
1321 /*
1322  * In a child there will be only one domain, reference that here.
1323  */
1324 static struct winbindd_domain *child_domain;
1325
1326 struct winbindd_domain *wb_child_domain(void)
1327 {
1328         return child_domain;
1329 }
1330
1331 struct child_handler_state {
1332         struct winbindd_child *child;
1333         struct winbindd_cli_state cli;
1334 };
1335
1336 static void child_handler(struct tevent_context *ev, struct tevent_fd *fde,
1337                           uint16_t flags, void *private_data)
1338 {
1339         struct child_handler_state *state =
1340                 (struct child_handler_state *)private_data;
1341         NTSTATUS status;
1342
1343         /* fetch a request from the main daemon */
1344         status = child_read_request(state->cli.sock, state->cli.request);
1345
1346         if (!NT_STATUS_IS_OK(status)) {
1347                 /* we lost contact with our parent */
1348                 _exit(0);
1349         }
1350
1351         DEBUG(4,("child daemon request %d\n",
1352                  (int)state->cli.request->cmd));
1353
1354         ZERO_STRUCTP(state->cli.response);
1355         state->cli.request->null_term = '\0';
1356         state->cli.mem_ctx = talloc_tos();
1357         child_process_request(state->child, &state->cli);
1358
1359         DEBUG(4, ("Finished processing child request %d\n",
1360                   (int)state->cli.request->cmd));
1361
1362         SAFE_FREE(state->cli.request->extra_data.data);
1363
1364         status = child_write_response(state->cli.sock, state->cli.response);
1365         if (!NT_STATUS_IS_OK(status)) {
1366                 exit(1);
1367         }
1368 }
1369
1370 static bool fork_domain_child(struct winbindd_child *child)
1371 {
1372         int fdpair[2];
1373         struct child_handler_state state;
1374         struct winbindd_request request;
1375         struct winbindd_response response;
1376         struct winbindd_domain *primary_domain = NULL;
1377         NTSTATUS status;
1378         ssize_t nwritten;
1379         struct tevent_fd *fde;
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
1388         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1389                 DEBUG(0, ("Could not open child pipe: %s\n",
1390                           strerror(errno)));
1391                 return False;
1392         }
1393
1394         ZERO_STRUCT(state);
1395         state.child = child;
1396         state.cli.pid = getpid();
1397         state.cli.request = &request;
1398         state.cli.response = &response;
1399
1400         child->pid = fork();
1401
1402         if (child->pid == -1) {
1403                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1404                 close(fdpair[0]);
1405                 close(fdpair[1]);
1406                 return False;
1407         }
1408
1409         if (child->pid != 0) {
1410                 /* Parent */
1411                 ssize_t nread;
1412
1413                 close(fdpair[0]);
1414
1415                 nread = sys_read(fdpair[1], &status, sizeof(status));
1416                 if (nread != sizeof(status)) {
1417                         DEBUG(1, ("fork_domain_child: Could not read child status: "
1418                                   "nread=%d, error=%s\n", (int)nread,
1419                                   strerror(errno)));
1420                         close(fdpair[1]);
1421                         return false;
1422                 }
1423                 if (!NT_STATUS_IS_OK(status)) {
1424                         DEBUG(1, ("fork_domain_child: Child status is %s\n",
1425                                   nt_errstr(status)));
1426                         close(fdpair[1]);
1427                         return false;
1428                 }
1429
1430                 child->next = child->prev = NULL;
1431                 DLIST_ADD(winbindd_children, child);
1432                 child->sock = fdpair[1];
1433                 return True;
1434         }
1435
1436         /* Child */
1437         child_domain = child->domain;
1438
1439         DEBUG(10, ("Child process %d\n", (int)getpid()));
1440
1441         state.cli.sock = fdpair[0];
1442         close(fdpair[1]);
1443
1444         status = winbindd_reinit_after_fork(child, child->logfilename);
1445
1446         nwritten = sys_write(state.cli.sock, &status, sizeof(status));
1447         if (nwritten != sizeof(status)) {
1448                 DEBUG(1, ("fork_domain_child: Could not write status: "
1449                           "nwritten=%d, error=%s\n", (int)nwritten,
1450                           strerror(errno)));
1451                 _exit(0);
1452         }
1453         if (!NT_STATUS_IS_OK(status)) {
1454                 DEBUG(1, ("winbindd_reinit_after_fork failed: %s\n",
1455                           nt_errstr(status)));
1456                 _exit(0);
1457         }
1458
1459         /* Handle online/offline messages. */
1460         messaging_register(winbind_messaging_context(), NULL,
1461                            MSG_WINBIND_OFFLINE, child_msg_offline);
1462         messaging_register(winbind_messaging_context(), NULL,
1463                            MSG_WINBIND_ONLINE, child_msg_online);
1464         messaging_register(winbind_messaging_context(), NULL,
1465                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1466         messaging_register(winbind_messaging_context(), NULL,
1467                            MSG_DEBUG, debug_message);
1468         messaging_register(winbind_messaging_context(), NULL,
1469                            MSG_WINBIND_IP_DROPPED,
1470                            winbind_msg_ip_dropped);
1471
1472
1473         primary_domain = find_our_domain();
1474
1475         if (primary_domain == NULL) {
1476                 smb_panic("no primary domain found");
1477         }
1478
1479         /* It doesn't matter if we allow cache login,
1480          * try to bring domain online after fork. */
1481         if ( child->domain ) {
1482                 child->domain->startup = True;
1483                 child->domain->startup_time = time_mono(NULL);
1484                 /* we can be in primary domain or in trusted domain
1485                  * If we are in trusted domain, set the primary domain
1486                  * in start-up mode */
1487                 if (!(child->domain->internal)) {
1488                         set_domain_online_request(child->domain);
1489                         if (!(child->domain->primary)) {
1490                                 primary_domain->startup = True;
1491                                 primary_domain->startup_time = time_mono(NULL);
1492                                 set_domain_online_request(primary_domain);
1493                         }
1494                 }
1495         }
1496
1497         /*
1498          * We are in idmap child, make sure that we set the
1499          * check_online_event to bring primary domain online.
1500          */
1501         if (child == idmap_child()) {
1502                 set_domain_online_request(primary_domain);
1503         }
1504
1505         /* We might be in the idmap child...*/
1506         if (child->domain && !(child->domain->internal) &&
1507             lp_winbind_offline_logon()) {
1508
1509                 set_domain_online_request(child->domain);
1510
1511                 if (primary_domain && (primary_domain != child->domain)) {
1512                         /* We need to talk to the primary
1513                          * domain as well as the trusted
1514                          * domain inside a trusted domain
1515                          * child.
1516                          * See the code in :
1517                          * set_dc_type_and_flags_trustinfo()
1518                          * for details.
1519                          */
1520                         set_domain_online_request(primary_domain);
1521                 }
1522
1523                 child->lockout_policy_event = tevent_add_timer(
1524                         winbind_event_context(), NULL, timeval_zero(),
1525                         account_lockout_policy_handler,
1526                         child);
1527         }
1528
1529         if (child->domain && child->domain->primary &&
1530             !USE_KERBEROS_KEYTAB &&
1531             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1532
1533                 struct timeval next_change;
1534
1535                 if (calculate_next_machine_pwd_change(child->domain->name,
1536                                                        &next_change)) {
1537                         child->machine_password_change_event = tevent_add_timer(
1538                                 winbind_event_context(), NULL, next_change,
1539                                 machine_password_change_handler,
1540                                 child);
1541                 }
1542         }
1543
1544         fde = tevent_add_fd(winbind_event_context(), NULL, state.cli.sock,
1545                             TEVENT_FD_READ, child_handler, &state);
1546         if (fde == NULL) {
1547                 DEBUG(1, ("tevent_add_fd failed\n"));
1548                 _exit(1);
1549         }
1550
1551         while (1) {
1552
1553                 int ret;
1554                 TALLOC_CTX *frame = talloc_stackframe();
1555
1556                 ret = tevent_loop_once(winbind_event_context());
1557                 if (ret != 0) {
1558                         DEBUG(1, ("tevent_loop_once failed: %s\n",
1559                                   strerror(errno)));
1560                         _exit(1);
1561                 }
1562
1563                 if (child->domain && child->domain->startup &&
1564                                 (time_mono(NULL) > child->domain->startup_time + 30)) {
1565                         /* No longer in "startup" mode. */
1566                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1567                                 child->domain->name ));
1568                         child->domain->startup = False;
1569                 }
1570
1571                 TALLOC_FREE(frame);
1572         }
1573 }
1574
1575 void winbind_msg_ip_dropped_parent(struct messaging_context *msg_ctx,
1576                                    void *private_data,
1577                                    uint32_t msg_type,
1578                                    struct server_id server_id,
1579                                    DATA_BLOB *data)
1580 {
1581         struct winbindd_child *child;
1582
1583         winbind_msg_ip_dropped(msg_ctx, private_data, msg_type,
1584                                server_id, data);
1585
1586
1587         for (child = winbindd_children; child != NULL; child = child->next) {
1588                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
1589                                    msg_type, data->data, data->length);
1590         }
1591 }