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 #include "lib/sys_rw_data.h"
  43
  44 #undef DBGC_CLASS
  45 #define DBGC_CLASS DBGC_WINBIND
  46
  47 extern bool override_logfile;
  48
  49 static struct winbindd_child *winbindd_children = NULL;
  50
  51 /* Read some data from a client connection */
  52
  53 static NTSTATUS child_read_request(int sock, struct winbindd_request *wreq)
  54 {
  55         NTSTATUS status;
  56
  57         status = read_data_ntstatus(sock, (char *)wreq, sizeof(*wreq));
  58         if (!NT_STATUS_IS_OK(status)) {
  59                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  60                           nt_errstr(status)));
  61                 return status;
  62         }
  63
  64         if (wreq->extra_len == 0) {
  65                 wreq->extra_data.data = NULL;
  66                 return NT_STATUS_OK;
  67         }
  68
  69         DEBUG(10, ("Need to read %d extra bytes\n", (int)wreq->extra_len));
  70
  71         wreq->extra_data.data = SMB_MALLOC_ARRAY(char, wreq->extra_len + 1);
  72         if (wreq->extra_data.data == NULL) {
  73                 DEBUG(0, ("malloc failed\n"));
  74                 return NT_STATUS_NO_MEMORY;
  75         }
  76
  77         /* Ensure null termination */
  78         wreq->extra_data.data[wreq->extra_len] = '\0';
  79
  80         status = read_data_ntstatus(sock, wreq->extra_data.data,
  81                                     wreq->extra_len);
  82         if (!NT_STATUS_IS_OK(status)) {
  83                 DEBUG(0, ("Could not read extra data: %s\n",
  84                           nt_errstr(status)));
  85         }
  86         return status;
  87 }
  88
  89 static NTSTATUS child_write_response(int sock, struct winbindd_response *wrsp)
  90 {
  91         struct iovec iov[2];
  92         int iov_count;
  93
  94         iov[0].iov_base = (void *)wrsp;
  95         iov[0].iov_len = sizeof(struct winbindd_response);
  96         iov_count = 1;
  97
  98         if (wrsp->length > sizeof(struct winbindd_response)) {
  99                 iov[1].iov_base = (void *)wrsp->extra_data.data;
 100                 iov[1].iov_len = wrsp->length-iov[0].iov_len;
 101                 iov_count = 2;
 102         }
 103
 104         DEBUG(10, ("Writing %d bytes to parent\n", (int)wrsp->length));
 105
 106         if (write_data_iov(sock, iov, iov_count) != wrsp->length) {
 107                 DEBUG(0, ("Could not write result\n"));
 108                 return NT_STATUS_INVALID_HANDLE;
 109         }
 110
 111         return NT_STATUS_OK;
 112 }
 113
 114 /*
 115  * Do winbind child async request. This is not simply wb_simple_trans. We have
 116  * to do the queueing ourselves because while a request is queued, the child
 117  * might have crashed, and we have to re-fork it in the _trigger function.
 118  */
 119
 120 struct wb_child_request_state {
 121         struct tevent_context *ev;
 122         struct winbindd_child *child;
 123         struct winbindd_request *request;
 124         struct winbindd_response *response;
 125 };
 126
 127 static bool fork_domain_child(struct winbindd_child *child);
 128
 129 static void wb_child_request_trigger(struct tevent_req *req,
 130                                             void *private_data);
 131 static void wb_child_request_done(struct tevent_req *subreq);
 132
 133 struct tevent_req *wb_child_request_send(TALLOC_CTX *mem_ctx,
 134                                          struct tevent_context *ev,
 135                                          struct winbindd_child *child,
 136                                          struct winbindd_request *request)
 137 {
 138         struct tevent_req *req;
 139         struct wb_child_request_state *state;
 140
 141         req = tevent_req_create(mem_ctx, &state,
 142                                 struct wb_child_request_state);
 143         if (req == NULL) {
 144                 return NULL;
 145         }
 146
 147         state->ev = ev;
 148         state->child = child;
 149         state->request = request;
 150
 151         if (!tevent_queue_add(child->queue, ev, req,
 152                               wb_child_request_trigger, NULL)) {
 153                 tevent_req_oom(req);
 154                 return tevent_req_post(req, ev);
 155         }
 156         return req;
 157 }
 158
 159 static void wb_child_request_trigger(struct tevent_req *req,
 160                                      void *private_data)
 161 {
 162         struct wb_child_request_state *state = tevent_req_data(
 163                 req, struct wb_child_request_state);
 164         struct tevent_req *subreq;
 165
 166         if ((state->child->sock == -1) && (!fork_domain_child(state->child))) {
 167                 tevent_req_error(req, errno);
 168                 return;
 169         }
 170
 171         subreq = wb_simple_trans_send(state, winbind_event_context(), NULL,
 172                                       state->child->sock, state->request);
 173         if (tevent_req_nomem(subreq, req)) {
 174                 return;
 175         }
 176         tevent_req_set_callback(subreq, wb_child_request_done, req);
 177         tevent_req_set_endtime(req, state->ev, timeval_current_ofs(300, 0));
 178 }
 179
 180 static void wb_child_request_done(struct tevent_req *subreq)
 181 {
 182         struct tevent_req *req = tevent_req_callback_data(
 183                 subreq, struct tevent_req);
 184         struct wb_child_request_state *state = tevent_req_data(
 185                 req, struct wb_child_request_state);
 186         int ret, err;
 187
 188         ret = wb_simple_trans_recv(subreq, state, &state->response, &err);
 189         TALLOC_FREE(subreq);
 190         if (ret == -1) {
 191                 /*
 192                  * The basic parent/child communication broke, close
 193                  * our socket
 194                  */
 195                 close(state->child->sock);
 196                 state->child->sock = -1;
 197                 DLIST_REMOVE(winbindd_children, state->child);
 198                 tevent_req_error(req, err);
 199                 return;
 200         }
 201         tevent_req_done(req);
 202 }
 203
 204 int wb_child_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 205                           struct winbindd_response **presponse, int *err)
 206 {
 207         struct wb_child_request_state *state = tevent_req_data(
 208                 req, struct wb_child_request_state);
 209
 210         if (tevent_req_is_unix_error(req, err)) {
 211                 return -1;
 212         }
 213         *presponse = talloc_move(mem_ctx, &state->response);
 214         return 0;
 215 }
 216
 217 static bool winbindd_child_busy(struct winbindd_child *child)
 218 {
 219         return tevent_queue_length(child->queue) > 0;
 220 }
 221
 222 static struct winbindd_child *find_idle_child(struct winbindd_domain *domain)
 223 {
 224         int i;
 225
 226         for (i=0; i<lp_winbind_max_domain_connections(); i++) {
 227                 if (!winbindd_child_busy(&domain->children[i])) {
 228                         return &domain->children[i];
 229                 }
 230         }
 231
 232         return NULL;
 233 }
 234
 235 struct winbindd_child *choose_domain_child(struct winbindd_domain *domain)
 236 {
 237         struct winbindd_child *result;
 238
 239         result = find_idle_child(domain);
 240         if (result != NULL) {
 241                 return result;
 242         }
 243         return &domain->children[rand() % lp_winbind_max_domain_connections()];
 244 }
 245
 246 struct dcerpc_binding_handle *dom_child_handle(struct winbindd_domain *domain)
 247 {
 248         struct winbindd_child *child;
 249
 250         child = choose_domain_child(domain);
 251         return child->binding_handle;
 252 }
 253
 254 struct wb_domain_request_state {
 255         struct tevent_context *ev;
 256         struct winbindd_domain *domain;
 257         struct winbindd_child *child;
 258         struct winbindd_request *request;
 259         struct winbindd_request *init_req;
 260         struct winbindd_response *response;
 261 };
 262
 263 static void wb_domain_request_gotdc(struct tevent_req *subreq);
 264 static void wb_domain_request_initialized(struct tevent_req *subreq);
 265 static void wb_domain_request_done(struct tevent_req *subreq);
 266
 267 struct tevent_req *wb_domain_request_send(TALLOC_CTX *mem_ctx,
 268                                           struct tevent_context *ev,
 269                                           struct winbindd_domain *domain,
 270                                           struct winbindd_request *request)
 271 {
 272         struct tevent_req *req, *subreq;
 273         struct wb_domain_request_state *state;
 274
 275         req = tevent_req_create(mem_ctx, &state,
 276                                 struct wb_domain_request_state);
 277         if (req == NULL) {
 278                 return NULL;
 279         }
 280
 281         state->child = choose_domain_child(domain);
 282
 283         if (domain->initialized) {
 284                 subreq = wb_child_request_send(state, ev, state->child,
 285                                                request);
 286                 if (tevent_req_nomem(subreq, req)) {
 287                         return tevent_req_post(req, ev);
 288                 }
 289                 tevent_req_set_callback(subreq, wb_domain_request_done, req);
 290                 return req;
 291         }
 292
 293         state->domain = domain;
 294         state->ev = ev;
 295         state->request = request;
 296
 297         state->init_req = talloc_zero(state, struct winbindd_request);
 298         if (tevent_req_nomem(state->init_req, req)) {
 299                 return tevent_req_post(req, ev);
 300         }
 301
 302         if (IS_DC || domain->primary || domain->internal) {
 303                 /* The primary domain has to find the DC name itself */
 304                 state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 305                 fstrcpy(state->init_req->domain_name, domain->name);
 306                 state->init_req->data.init_conn.is_primary = domain->primary;
 307                 fstrcpy(state->init_req->data.init_conn.dcname, "");
 308
 309                 subreq = wb_child_request_send(state, ev, state->child,
 310                                                state->init_req);
 311                 if (tevent_req_nomem(subreq, req)) {
 312                         return tevent_req_post(req, ev);
 313                 }
 314                 tevent_req_set_callback(subreq, wb_domain_request_initialized,
 315                                         req);
 316                 return req;
 317         }
 318
 319         /*
 320          * Ask our DC for a DC name
 321          */
 322         domain = find_our_domain();
 323
 324         /* This is *not* the primary domain, let's ask our DC about a DC
 325          * name */
 326
 327         state->init_req->cmd = WINBINDD_GETDCNAME;
 328         fstrcpy(state->init_req->domain_name, domain->name);
 329
 330         subreq = wb_child_request_send(state, ev, state->child, request);
 331         if (tevent_req_nomem(subreq, req)) {
 332                 return tevent_req_post(req, ev);
 333         }
 334         tevent_req_set_callback(subreq, wb_domain_request_gotdc, req);
 335         return req;
 336 }
 337
 338 static void wb_domain_request_gotdc(struct tevent_req *subreq)
 339 {
 340         struct tevent_req *req = tevent_req_callback_data(
 341                 subreq, struct tevent_req);
 342         struct wb_domain_request_state *state = tevent_req_data(
 343                 req, struct wb_domain_request_state);
 344         struct winbindd_response *response;
 345         int ret, err;
 346
 347         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 348         TALLOC_FREE(subreq);
 349         if (ret == -1) {
 350                 tevent_req_error(req, err);
 351                 return;
 352         }
 353         state->init_req->cmd = WINBINDD_INIT_CONNECTION;
 354         fstrcpy(state->init_req->domain_name, state->domain->name);
 355         state->init_req->data.init_conn.is_primary = False;
 356         fstrcpy(state->init_req->data.init_conn.dcname,
 357                 response->data.dc_name);
 358
 359         TALLOC_FREE(response);
 360
 361         subreq = wb_child_request_send(state, state->ev, state->child,
 362                                        state->init_req);
 363         if (tevent_req_nomem(subreq, req)) {
 364                 return;
 365         }
 366         tevent_req_set_callback(subreq, wb_domain_request_initialized, req);
 367 }
 368
 369 static void wb_domain_request_initialized(struct tevent_req *subreq)
 370 {
 371         struct tevent_req *req = tevent_req_callback_data(
 372                 subreq, struct tevent_req);
 373         struct wb_domain_request_state *state = tevent_req_data(
 374                 req, struct wb_domain_request_state);
 375         struct winbindd_response *response;
 376         int ret, err;
 377
 378         ret = wb_child_request_recv(subreq, talloc_tos(), &response, &err);
 379         TALLOC_FREE(subreq);
 380         if (ret == -1) {
 381                 tevent_req_error(req, err);
 382                 return;
 383         }
 384
 385         if (!string_to_sid(&state->domain->sid,
 386                            response->data.domain_info.sid)) {
 387                 DEBUG(1,("init_child_recv: Could not convert sid %s "
 388                         "from string\n", response->data.domain_info.sid));
 389                 tevent_req_error(req, EINVAL);
 390                 return;
 391         }
 392
 393         talloc_free(state->domain->name);
 394         state->domain->name = talloc_strdup(state->domain,
 395                                             response->data.domain_info.name);
 396         if (state->domain->name == NULL) {
 397                 tevent_req_error(req, ENOMEM);
 398                 return;
 399         }
 400
 401         if (response->data.domain_info.alt_name[0] != '\0') {
 402                 talloc_free(state->domain->alt_name);
 403
 404                 state->domain->alt_name = talloc_strdup(state->domain,
 405                                 response->data.domain_info.alt_name);
 406                 if (state->domain->alt_name == NULL) {
 407                         tevent_req_error(req, ENOMEM);
 408                         return;
 409                 }
 410         }
 411
 412         state->domain->native_mode = response->data.domain_info.native_mode;
 413         state->domain->active_directory =
 414                 response->data.domain_info.active_directory;
 415         state->domain->initialized = true;
 416
 417         TALLOC_FREE(response);
 418
 419         subreq = wb_child_request_send(state, state->ev, state->child,
 420                                        state->request);
 421         if (tevent_req_nomem(subreq, req)) {
 422                 return;
 423         }
 424         tevent_req_set_callback(subreq, wb_domain_request_done, req);
 425 }
 426
 427 static void wb_domain_request_done(struct tevent_req *subreq)
 428 {
 429         struct tevent_req *req = tevent_req_callback_data(
 430                 subreq, struct tevent_req);
 431         struct wb_domain_request_state *state = tevent_req_data(
 432                 req, struct wb_domain_request_state);
 433         int ret, err;
 434
 435         ret = wb_child_request_recv(subreq, talloc_tos(), &state->response,
 436                                     &err);
 437         TALLOC_FREE(subreq);
 438         if (ret == -1) {
 439                 tevent_req_error(req, err);
 440                 return;
 441         }
 442         tevent_req_done(req);
 443 }
 444
 445 int wb_domain_request_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
 446                            struct winbindd_response **presponse, int *err)
 447 {
 448         struct wb_domain_request_state *state = tevent_req_data(
 449                 req, struct wb_domain_request_state);
 450
 451         if (tevent_req_is_unix_error(req, err)) {
 452                 return -1;
 453         }
 454         *presponse = talloc_move(mem_ctx, &state->response);
 455         return 0;
 456 }
 457
 458 static void child_process_request(struct winbindd_child *child,
 459                                   struct winbindd_cli_state *state)
 460 {
 461         struct winbindd_domain *domain = child->domain;
 462         const struct winbindd_child_dispatch_table *table = child->table;
 463
 464         /* Free response data - we may be interrupted and receive another
 465            command before being able to send this data off. */
 466
 467         state->response->result = WINBINDD_ERROR;
 468         state->response->length = sizeof(struct winbindd_response);
 469
 470         /* as all requests in the child are sync, we can use talloc_tos() */
 471         state->mem_ctx = talloc_tos();
 472
 473         /* Process command */
 474
 475         for (; table->name; table++) {
 476                 if (state->request->cmd == table->struct_cmd) {
 477                         DEBUG(10,("child_process_request: request fn %s\n",
 478                                   table->name));
 479                         state->response->result = table->struct_fn(domain, state);
 480                         return;
 481                 }
 482         }
 483
 484         DEBUG(1, ("child_process_request: unknown request fn number %d\n",
 485                   (int)state->request->cmd));
 486         state->response->result = WINBINDD_ERROR;
 487 }
 488
 489 void setup_child(struct winbindd_domain *domain, struct winbindd_child *child,
 490                  const struct winbindd_child_dispatch_table *table,
 491                  const char *logprefix,
 492                  const char *logname)
 493 {
 494         if (logprefix && logname) {
 495                 char *logbase = NULL;
 496
 497                 if (*lp_logfile(talloc_tos())) {
 498                         char *end = NULL;
 499
 500                         if (asprintf(&logbase, "%s", lp_logfile(talloc_tos())) < 0) {
 501                                 smb_panic("Internal error: asprintf failed");
 502                         }
 503
 504                         if ((end = strrchr_m(logbase, '/'))) {
 505                                 *end = '\0';
 506                         }
 507                 } else {
 508                         if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
 509                                 smb_panic("Internal error: asprintf failed");
 510                         }
 511                 }
 512
 513                 if (asprintf(&child->logfilename, "%s/%s-%s",
 514                              logbase, logprefix, logname) < 0) {
 515                         SAFE_FREE(logbase);
 516                         smb_panic("Internal error: asprintf failed");
 517                 }
 518
 519                 SAFE_FREE(logbase);
 520         } else {
 521                 smb_panic("Internal error: logprefix == NULL && "
 522                           "logname == NULL");
 523         }
 524
 525         child->sock = -1;
 526         child->domain = domain;
 527         child->table = table;
 528         child->queue = tevent_queue_create(NULL, "winbind_child");
 529         SMB_ASSERT(child->queue != NULL);
 530         child->binding_handle = wbint_binding_handle(NULL, domain, child);
 531         SMB_ASSERT(child->binding_handle != NULL);
 532 }
 533
 534 void winbind_child_died(pid_t pid)
 535 {
 536         struct winbindd_child *child;
 537
 538         for (child = winbindd_children; child != NULL; child = child->next) {
 539                 if (child->pid == pid) {
 540                         break;
 541                 }
 542         }
 543
 544         if (child == NULL) {
 545                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 546                 return;
 547         }
 548
 549         /* This will be re-added in fork_domain_child() */
 550
 551         DLIST_REMOVE(winbindd_children, child);
 552         child->pid = 0;
 553
 554         if (child->sock != -1) {
 555                 close(child->sock);
 556                 child->sock = -1;
 557         }
 558 }
 559
 560 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 561
 562 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 563 {
 564         flush_negative_conn_cache_for_domain(domain->name);
 565         if (domain->alt_name != NULL) {
 566                 flush_negative_conn_cache_for_domain(domain->alt_name);
 567         }
 568 }
 569
 570 /*
 571  * Parent winbindd process sets its own debug level first and then
 572  * sends a message to all the winbindd children to adjust their debug
 573  * level to that of parents.
 574  */
 575
 576 void winbind_msg_debug(struct messaging_context *msg_ctx,
 577                          void *private_data,
 578                          uint32_t msg_type,
 579                          struct server_id server_id,
 580                          DATA_BLOB *data)
 581 {
 582         struct winbindd_child *child;
 583
 584         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 585
 586         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 587
 588         for (child = winbindd_children; child != NULL; child = child->next) {
 589
 590                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 591                         (unsigned int)child->pid));
 592
 593                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 594                            MSG_DEBUG,
 595                            data->data,
 596                            strlen((char *) data->data) + 1);
 597         }
 598 }
 599
 600 /* Set our domains as offline and forward the offline message to our children. */
 601
 602 void winbind_msg_offline(struct messaging_context *msg_ctx,
 603                          void *private_data,
 604                          uint32_t msg_type,
 605                          struct server_id server_id,
 606                          DATA_BLOB *data)
 607 {
 608         struct winbindd_child *child;
 609         struct winbindd_domain *domain;
 610
 611         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 612
 613         if (!lp_winbind_offline_logon()) {
 614                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 615                 return;
 616         }
 617
 618         /* Set our global state as offline. */
 619         if (!set_global_winbindd_state_offline()) {
 620                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 621                 return;
 622         }
 623
 624         /* Set all our domains as offline. */
 625         for (domain = domain_list(); domain; domain = domain->next) {
 626                 if (domain->internal) {
 627                         continue;
 628                 }
 629                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 630                 set_domain_offline(domain);
 631         }
 632
 633         for (child = winbindd_children; child != NULL; child = child->next) {
 634                 /* Don't send message to internal children.  We've already
 635                    done so above. */
 636                 if (!child->domain || winbindd_internal_child(child)) {
 637                         continue;
 638                 }
 639
 640                 /* Or internal domains (this should not be possible....) */
 641                 if (child->domain->internal) {
 642                         continue;
 643                 }
 644
 645                 /* Each winbindd child should only process requests for one domain - make sure
 646                    we only set it online / offline for that domain. */
 647
 648                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 649                         (unsigned int)child->pid, child->domain->name ));
 650
 651                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 652                                    MSG_WINBIND_OFFLINE,
 653                                    (const uint8_t *)child->domain->name,
 654                                    strlen(child->domain->name)+1);
 655         }
 656 }
 657
 658 /* Set our domains as online and forward the online message to our children. */
 659
 660 void winbind_msg_online(struct messaging_context *msg_ctx,
 661                         void *private_data,
 662                         uint32_t msg_type,
 663                         struct server_id server_id,
 664                         DATA_BLOB *data)
 665 {
 666         struct winbindd_child *child;
 667         struct winbindd_domain *domain;
 668
 669         DEBUG(10,("winbind_msg_online: got online message.\n"));
 670
 671         if (!lp_winbind_offline_logon()) {
 672                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 673                 return;
 674         }
 675
 676         /* Set our global state as online. */
 677         set_global_winbindd_state_online();
 678
 679         smb_nscd_flush_user_cache();
 680         smb_nscd_flush_group_cache();
 681
 682         /* Set all our domains as online. */
 683         for (domain = domain_list(); domain; domain = domain->next) {
 684                 if (domain->internal) {
 685                         continue;
 686                 }
 687                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 688
 689                 winbindd_flush_negative_conn_cache(domain);
 690                 set_domain_online_request(domain);
 691
 692                 /* Send an online message to the idmap child when our
 693                    primary domain comes back online */
 694
 695                 if ( domain->primary ) {
 696                         struct winbindd_child *idmap = idmap_child();
 697
 698                         if ( idmap->pid != 0 ) {
 699                                 messaging_send_buf(msg_ctx,
 700                                                    pid_to_procid(idmap->pid),
 701                                                    MSG_WINBIND_ONLINE,
 702                                                    (const uint8_t *)domain->name,
 703                                                    strlen(domain->name)+1);
 704                         }
 705                 }
 706         }
 707
 708         for (child = winbindd_children; child != NULL; child = child->next) {
 709                 /* Don't send message to internal childs. */
 710                 if (!child->domain || winbindd_internal_child(child)) {
 711                         continue;
 712                 }
 713
 714                 /* Or internal domains (this should not be possible....) */
 715                 if (child->domain->internal) {
 716                         continue;
 717                 }
 718
 719                 /* Each winbindd child should only process requests for one domain - make sure
 720                    we only set it online / offline for that domain. */
 721
 722                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 723                         (unsigned int)child->pid, child->domain->name ));
 724
 725                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 726                                    MSG_WINBIND_ONLINE,
 727                                    (const uint8_t *)child->domain->name,
 728                                    strlen(child->domain->name)+1);
 729         }
 730 }
 731
 732 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 733 {
 734         struct winbindd_domain *domain;
 735         char *buf = NULL;
 736
 737         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 738                                    get_global_winbindd_state_offline() ?
 739                                    "Offline":"Online")) == NULL) {
 740                 return NULL;
 741         }
 742
 743         for (domain = domain_list(); domain; domain = domain->next) {
 744                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 745                                                   domain->name,
 746                                                   domain->online ?
 747                                                   "Online":"Offline")) == NULL) {
 748                         return NULL;
 749                 }
 750         }
 751
 752         buf = talloc_asprintf_append_buffer(buf, "\n");
 753
 754         DEBUG(5,("collect_onlinestatus: %s", buf));
 755
 756         return buf;
 757 }
 758
 759 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 760                               void *private_data,
 761                               uint32_t msg_type,
 762                               struct server_id server_id,
 763                               DATA_BLOB *data)
 764 {
 765         TALLOC_CTX *mem_ctx;
 766         const char *message;
 767         struct server_id *sender;
 768
 769         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 770
 771         if (!data->data) {
 772                 return;
 773         }
 774
 775         sender = (struct server_id *)data->data;
 776
 777         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 778         if (mem_ctx == NULL) {
 779                 return;
 780         }
 781
 782         message = collect_onlinestatus(mem_ctx);
 783         if (message == NULL) {
 784                 talloc_destroy(mem_ctx);
 785                 return;
 786         }
 787
 788         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 789                            (const uint8 *)message, strlen(message) + 1);
 790
 791         talloc_destroy(mem_ctx);
 792 }
 793
 794 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 795                                  void *private_data,
 796                                  uint32_t msg_type,
 797                                  struct server_id server_id,
 798                                  DATA_BLOB *data)
 799 {
 800         struct winbindd_child *child;
 801
 802         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 803
 804         dump_event_list(winbind_event_context());
 805
 806         for (child = winbindd_children; child != NULL; child = child->next) {
 807
 808                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 809                         (unsigned int)child->pid));
 810
 811                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 812                                    MSG_DUMP_EVENT_LIST,
 813                                    NULL, 0);
 814         }
 815
 816 }
 817
 818 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 819                                   void *private_data,
 820                                   uint32_t msg_type,
 821                                   struct server_id server_id,
 822                                   DATA_BLOB *data)
 823 {
 824         TALLOC_CTX *mem_ctx;
 825         const char *message = NULL;
 826         struct server_id *sender = NULL;
 827         const char *domain = NULL;
 828         char *s = NULL;
 829         NTSTATUS status;
 830         struct winbindd_domain *dom = NULL;
 831
 832         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 833
 834         if (!data || !data->data) {
 835                 return;
 836         }
 837
 838         if (data->length < sizeof(struct server_id)) {
 839                 return;
 840         }
 841
 842         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 843         if (!mem_ctx) {
 844                 return;
 845         }
 846
 847         sender = (struct server_id *)data->data;
 848         if (data->length > sizeof(struct server_id)) {
 849                 domain = (const char *)data->data+sizeof(struct server_id);
 850         }
 851
 852         if (domain) {
 853
 854                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 855                         domain));
 856
 857                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 858                                                   find_domain_from_name_noinit(domain));
 859                 if (!message) {
 860                         talloc_destroy(mem_ctx);
 861                         return;
 862                 }
 863
 864                 messaging_send_buf(msg_ctx, *sender,
 865                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 866                                    (const uint8_t *)message, strlen(message) + 1);
 867
 868                 talloc_destroy(mem_ctx);
 869
 870                 return;
 871         }
 872
 873         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 874
 875         for (dom = domain_list(); dom; dom=dom->next) {
 876                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 877                 if (!message) {
 878                         talloc_destroy(mem_ctx);
 879                         return;
 880                 }
 881
 882                 s = talloc_asprintf_append(s, "%s\n", message);
 883                 if (!s) {
 884                         talloc_destroy(mem_ctx);
 885                         return;
 886                 }
 887         }
 888
 889         status = messaging_send_buf(msg_ctx, *sender,
 890                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 891                                     (uint8_t *)s, strlen(s) + 1);
 892         if (!NT_STATUS_IS_OK(status)) {
 893                 DEBUG(0,("failed to send message: %s\n",
 894                 nt_errstr(status)));
 895         }
 896
 897         talloc_destroy(mem_ctx);
 898 }
 899
 900 static void account_lockout_policy_handler(struct tevent_context *ctx,
 901                                            struct tevent_timer *te,
 902                                            struct timeval now,
 903                                            void *private_data)
 904 {
 905         struct winbindd_child *child =
 906                 (struct winbindd_child *)private_data;
 907         TALLOC_CTX *mem_ctx = NULL;
 908         struct winbindd_methods *methods;
 909         struct samr_DomInfo12 lockout_policy;
 910         NTSTATUS result;
 911
 912         DEBUG(10,("account_lockout_policy_handler called\n"));
 913
 914         TALLOC_FREE(child->lockout_policy_event);
 915
 916         if ( !winbindd_can_contact_domain( child->domain ) ) {
 917                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 918                           "do not have an incoming trust to domain %s\n",
 919                           child->domain->name));
 920
 921                 return;
 922         }
 923
 924         methods = child->domain->methods;
 925
 926         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 927         if (!mem_ctx) {
 928                 result = NT_STATUS_NO_MEMORY;
 929         } else {
 930                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 931         }
 932         TALLOC_FREE(mem_ctx);
 933
 934         if (!NT_STATUS_IS_OK(result)) {
 935                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 936                          nt_errstr(result)));
 937         }
 938
 939         child->lockout_policy_event = tevent_add_timer(winbind_event_context(), NULL,
 940                                                       timeval_current_ofs(3600, 0),
 941                                                       account_lockout_policy_handler,
 942                                                       child);
 943 }
 944
 945 static time_t get_machine_password_timeout(void)
 946 {
 947         /* until we have gpo support use lp setting */
 948         return lp_machine_password_timeout();
 949 }
 950
 951 static bool calculate_next_machine_pwd_change(const char *domain,
 952                                               struct timeval *t)
 953 {
 954         time_t pass_last_set_time;
 955         time_t timeout;
 956         time_t next_change;
 957         struct timeval tv;
 958         char *pw;
 959
 960         pw = secrets_fetch_machine_password(domain,
 961                                             &pass_last_set_time,
 962                                             NULL);
 963
 964         if (pw == NULL) {
 965                 DEBUG(0,("cannot fetch own machine password ????"));
 966                 return false;
 967         }
 968
 969         SAFE_FREE(pw);
 970
 971         timeout = get_machine_password_timeout();
 972         if (timeout == 0) {
 973                 DEBUG(10,("machine password never expires\n"));
 974                 return false;
 975         }
 976
 977         tv.tv_sec = pass_last_set_time;
 978         DEBUG(10, ("password last changed %s\n",
 979                    timeval_string(talloc_tos(), &tv, false)));
 980         tv.tv_sec += timeout;
 981         DEBUGADD(10, ("password valid until %s\n",
 982                       timeval_string(talloc_tos(), &tv, false)));
 983
 984         if (time(NULL) < (pass_last_set_time + timeout)) {
 985                 next_change = pass_last_set_time + timeout;
 986                 DEBUG(10,("machine password still valid until: %s\n",
 987                         http_timestring(talloc_tos(), next_change)));
 988                 *t = timeval_set(next_change, 0);
 989
 990                 if (lp_clustering()) {
 991                         uint8_t randbuf;
 992                         /*
 993                          * When having a cluster, we have several
 994                          * winbinds racing for the password change. In
 995                          * the machine_password_change_handler()
 996                          * function we check if someone else was
 997                          * faster when the event triggers. We add a
 998                          * 255-second random delay here, so that we
 999                          * don't run to change the password at the
1000                          * exact same moment.
1001                          */
1002                         generate_random_buffer(&randbuf, sizeof(randbuf));
1003                         DEBUG(10, ("adding %d seconds randomness\n",
1004                                    (int)randbuf));
1005                         t->tv_sec += randbuf;
1006                 }
1007                 return true;
1008         }
1009
1010         DEBUG(10,("machine password expired, needs immediate change\n"));
1011
1012         *t = timeval_zero();
1013
1014         return true;
1015 }
1016
1017 static void machine_password_change_handler(struct tevent_context *ctx,
1018                                             struct tevent_timer *te,
1019                                             struct timeval now,
1020                                             void *private_data)
1021 {
1022         struct messaging_context *msg_ctx = winbind_messaging_context();
1023         struct winbindd_child *child =
1024                 (struct winbindd_child *)private_data;
1025         struct rpc_pipe_client *netlogon_pipe = NULL;
1026         NTSTATUS result;
1027         struct timeval next_change;
1028
1029         DEBUG(10,("machine_password_change_handler called\n"));
1030
1031         TALLOC_FREE(child->machine_password_change_event);
1032
1033         if (!calculate_next_machine_pwd_change(child->domain->name,
1034                                                &next_change)) {
1035                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1036                 return;
1037         }
1038
1039         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1040                    timeval_string(talloc_tos(), &next_change, false)));
1041
1042         if (!timeval_expired(&next_change)) {
1043                 DEBUG(10, ("Someone else has already changed the pw\n"));
1044                 goto done;
1045         }
1046
1047         if (!winbindd_can_contact_domain(child->domain)) {
1048                 DEBUG(10,("machine_password_change_handler: Removing myself since I "
1049                           "do not have an incoming trust to domain %s\n",
1050                           child->domain->name));
1051                 return;
1052         }
1053
1054         result = cm_connect_netlogon(child->domain, &netlogon_pipe);
1055         if (!NT_STATUS_IS_OK(result)) {
1056                 DEBUG(10,("machine_password_change_handler: "
1057                         "failed to connect netlogon pipe: %s\n",
1058                          nt_errstr(result)));
1059                 return;
1060         }
1061
1062         result = trust_pw_change(child->domain->conn.netlogon_creds,
1063                                  msg_ctx,
1064                                  netlogon_pipe->binding_handle,
1065                                  child->domain->name,
1066                                  false); /* force */
1067
1068         DEBUG(10, ("machine_password_change_handler: "
1069                    "trust_pw_change returned %s\n",
1070                    nt_errstr(result)));
1071
1072         if (NT_STATUS_EQUAL(result, NT_STATUS_ACCESS_DENIED) ) {
1073                 DEBUG(3,("machine_password_change_handler: password set returned "
1074                          "ACCESS_DENIED.  Maybe the trust account "
1075                          "password was changed and we didn't know it. "
1076                          "Killing connections to domain %s\n",
1077                          child->domain->name));
1078                 invalidate_cm_connection(child->domain);
1079         }
1080
1081         if (!calculate_next_machine_pwd_change(child->domain->name,
1082                                                &next_change)) {
1083                 DEBUG(10, ("calculate_next_machine_pwd_change failed\n"));
1084                 return;
1085         }
1086
1087         DEBUG(10, ("calculate_next_machine_pwd_change returned %s\n",
1088                    timeval_string(talloc_tos(), &next_change, false)));
1089
1090         if (!NT_STATUS_IS_OK(result)) {
1091                 struct timeval tmp;
1092                 /*
1093                  * In case of failure, give the DC a minute to recover
1094                  */
1095                 tmp = timeval_current_ofs(60, 0);
1096                 next_change = timeval_max(&next_change, &tmp);
1097         }
1098
1099 done:
1100         child->machine_password_change_event = tevent_add_timer(winbind_event_context(), NULL,
1101                                                               next_change,
1102                                                               machine_password_change_handler,
1103                                                               child);
1104 }
1105
1106 /* Deal with a request to go offline. */
1107
1108 static void child_msg_offline(struct messaging_context *msg,
1109                               void *private_data,
1110                               uint32_t msg_type,
1111                               struct server_id server_id,
1112                               DATA_BLOB *data)
1113 {
1114         struct winbindd_domain *domain;
1115         struct winbindd_domain *primary_domain = NULL;
1116         const char *domainname = (const char *)data->data;
1117
1118         if (data->data == NULL || data->length == 0) {
1119                 return;
1120         }
1121
1122         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
1123
1124         if (!lp_winbind_offline_logon()) {
1125                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
1126                 return;
1127         }
1128
1129         primary_domain = find_our_domain();
1130
1131         /* Mark the requested domain offline. */
1132
1133         for (domain = domain_list(); domain; domain = domain->next) {
1134                 if (domain->internal) {
1135                         continue;
1136                 }
1137                 if (strequal(domain->name, domainname)) {
1138                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
1139                         set_domain_offline(domain);
1140                         /* we are in the trusted domain, set the primary domain
1141                          * offline too */
1142                         if (domain != primary_domain) {
1143                                 set_domain_offline(primary_domain);
1144                         }
1145                 }
1146         }
1147 }
1148
1149 /* Deal with a request to go online. */
1150
1151 static void child_msg_online(struct messaging_context *msg,
1152                              void *private_data,
1153                              uint32_t msg_type,
1154                              struct server_id server_id,
1155                              DATA_BLOB *data)
1156 {
1157         struct winbindd_domain *domain;
1158         struct winbindd_domain *primary_domain = NULL;
1159         const char *domainname = (const char *)data->data;
1160
1161         if (data->data == NULL || data->length == 0) {
1162                 return;
1163         }
1164
1165         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
1166
1167         if (!lp_winbind_offline_logon()) {
1168                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
1169                 return;
1170         }
1171
1172         primary_domain = find_our_domain();
1173
1174         /* Set our global state as online. */
1175         set_global_winbindd_state_online();
1176
1177         /* Try and mark everything online - delete any negative cache entries
1178            to force a reconnect now. */
1179
1180         for (domain = domain_list(); domain; domain = domain->next) {
1181                 if (domain->internal) {
1182                         continue;
1183                 }
1184                 if (strequal(domain->name, domainname)) {
1185                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
1186                         winbindd_flush_negative_conn_cache(domain);
1187                         set_domain_online_request(domain);
1188
1189                         /* we can be in trusted domain, which will contact primary domain
1190                          * we have to bring primary domain online in trusted domain process
1191                          * see, winbindd_dual_pam_auth() --> winbindd_dual_pam_auth_samlogon()
1192                          * --> contact_domain = find_our_domain()
1193                          * */
1194                         if (domain != primary_domain) {
1195                                 winbindd_flush_negative_conn_cache(primary_domain);
1196                                 set_domain_online_request(primary_domain);
1197                         }
1198                 }
1199         }
1200 }
1201
1202 static void child_msg_dump_event_list(struct messaging_context *msg,
1203                                       void *private_data,
1204                                       uint32_t msg_type,
1205                                       struct server_id server_id,
1206                                       DATA_BLOB *data)
1207 {
1208         DEBUG(5,("child_msg_dump_event_list received\n"));
1209
1210         dump_event_list(winbind_event_context());
1211 }
1212
1213 NTSTATUS winbindd_reinit_after_fork(const struct winbindd_child *myself,
1214                                     const char *logfilename)
1215 {
1216         struct winbindd_domain *domain;
1217         struct winbindd_child *cl;
1218         NTSTATUS status;
1219
1220         status = reinit_after_fork(
1221                 winbind_messaging_context(),
1222                 winbind_event_context(),
1223                 true);
1224         if (!NT_STATUS_IS_OK(status)) {
1225                 DEBUG(0,("reinit_after_fork() failed\n"));
1226                 return status;
1227         }
1228
1229         close_conns_after_fork();
1230
1231         if (!override_logfile && logfilename) {
1232                 lp_set_logfile(logfilename);
1233                 reopen_logs();
1234         }
1235
1236         if (!winbindd_setup_sig_term_handler(false))
1237                 return NT_STATUS_NO_MEMORY;
1238         if (!winbindd_setup_sig_hup_handler(override_logfile ? NULL :
1239                                             logfilename))
1240                 return NT_STATUS_NO_MEMORY;
1241
1242         /* Stop zombies in children */
1243         CatchChild();
1244
1245         /* Don't handle the same messages as our parent. */
1246         messaging_deregister(winbind_messaging_context(),
1247                              MSG_SMB_CONF_UPDATED, NULL);
1248         messaging_deregister(winbind_messaging_context(),
1249                              MSG_SHUTDOWN, NULL);
1250         messaging_deregister(winbind_messaging_context(),
1251                              MSG_WINBIND_OFFLINE, NULL);
1252         messaging_deregister(winbind_messaging_context(),
1253                              MSG_WINBIND_ONLINE, NULL);
1254         messaging_deregister(winbind_messaging_context(),
1255                              MSG_WINBIND_ONLINESTATUS, NULL);
1256         messaging_deregister(winbind_messaging_context(),
1257                              MSG_DUMP_EVENT_LIST, NULL);
1258         messaging_deregister(winbind_messaging_context(),
1259                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1260         messaging_deregister(winbind_messaging_context(),
1261                              MSG_DEBUG, NULL);
1262
1263         messaging_deregister(winbind_messaging_context(),
1264                              MSG_WINBIND_DOMAIN_OFFLINE, NULL);
1265         messaging_deregister(winbind_messaging_context(),
1266                              MSG_WINBIND_DOMAIN_ONLINE, NULL);
1267
1268         /* We have destroyed all events in the winbindd_event_context
1269          * in reinit_after_fork(), so clean out all possible pending
1270          * event pointers. */
1271
1272         /* Deal with check_online_events. */
1273
1274         for (domain = domain_list(); domain; domain = domain->next) {
1275                 TALLOC_FREE(domain->check_online_event);
1276         }
1277
1278         /* Ensure we're not handling a credential cache event inherited
1279          * from our parent. */
1280
1281         ccache_remove_all_after_fork();
1282
1283         /* Destroy all possible events in child list. */
1284         for (cl = winbindd_children; cl != NULL; cl = cl->next) {
1285                 TALLOC_FREE(cl->lockout_policy_event);
1286                 TALLOC_FREE(cl->machine_password_change_event);
1287
1288                 /* Children should never be able to send
1289                  * each other messages, all messages must
1290                  * go through the parent.
1291                  */
1292                 cl->pid = (pid_t)0;
1293
1294                 /*
1295                  * Close service sockets to all other children
1296                  */
1297                 if ((cl != myself) && (cl->sock != -1)) {
1298                         close(cl->sock);
1299                         cl->sock = -1;
1300                 }
1301         }
1302         /*
1303          * This is a little tricky, children must not
1304          * send an MSG_WINBIND_ONLINE message to idmap_child().
1305          * If we are in a child of our primary domain or
1306          * in the process created by fork_child_dc_connect(),
1307          * and the primary domain cannot go online,
1308          * fork_child_dc_connection() sends MSG_WINBIND_ONLINE
1309          * periodically to idmap_child().
1310          *
1311          * The sequence is, fork_child_dc_connect() ---> getdcs() --->
1312          * get_dc_name_via_netlogon() ---> cm_connect_netlogon()
1313          * ---> init_dc_connection() ---> cm_open_connection --->
1314          * set_domain_online(), sends MSG_WINBIND_ONLINE to
1315          * idmap_child(). Disallow children sending messages
1316          * to each other, all messages must go through the parent.
1317          */
1318         cl = idmap_child();
1319         cl->pid = (pid_t)0;
1320
1321         return NT_STATUS_OK;
1322 }
1323
1324 /*
1325  * In a child there will be only one domain, reference that here.
1326  */
1327 static struct winbindd_domain *child_domain;
1328
1329 struct winbindd_domain *wb_child_domain(void)
1330 {
1331         return child_domain;
1332 }
1333
1334 struct child_handler_state {
1335         struct winbindd_child *child;
1336         struct winbindd_cli_state cli;
1337 };
1338
1339 static void child_handler(struct tevent_context *ev, struct tevent_fd *fde,
1340                           uint16_t flags, void *private_data)
1341 {
1342         struct child_handler_state *state =
1343                 (struct child_handler_state *)private_data;
1344         NTSTATUS status;
1345
1346         /* fetch a request from the main daemon */
1347         status = child_read_request(state->cli.sock, state->cli.request);
1348
1349         if (!NT_STATUS_IS_OK(status)) {
1350                 /* we lost contact with our parent */
1351                 _exit(0);
1352         }
1353
1354         DEBUG(4,("child daemon request %d\n",
1355                  (int)state->cli.request->cmd));
1356
1357         ZERO_STRUCTP(state->cli.response);
1358         state->cli.request->null_term = '\0';
1359         state->cli.mem_ctx = talloc_tos();
1360         child_process_request(state->child, &state->cli);
1361
1362         DEBUG(4, ("Finished processing child request %d\n",
1363                   (int)state->cli.request->cmd));
1364
1365         SAFE_FREE(state->cli.request->extra_data.data);
1366
1367         status = child_write_response(state->cli.sock, state->cli.response);
1368         if (!NT_STATUS_IS_OK(status)) {
1369                 exit(1);
1370         }
1371 }
1372
1373 static bool fork_domain_child(struct winbindd_child *child)
1374 {
1375         int fdpair[2];
1376         struct child_handler_state state;
1377         struct winbindd_request request;
1378         struct winbindd_response response;
1379         struct winbindd_domain *primary_domain = NULL;
1380         NTSTATUS status;
1381         ssize_t nwritten;
1382         struct tevent_fd *fde;
1383
1384         if (child->domain) {
1385                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1386                            child->domain->name));
1387         } else {
1388                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1389         }
1390
1391         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1392                 DEBUG(0, ("Could not open child pipe: %s\n",
1393                           strerror(errno)));
1394                 return False;
1395         }
1396
1397         ZERO_STRUCT(state);
1398         state.child = child;
1399         state.cli.pid = getpid();
1400         state.cli.request = &request;
1401         state.cli.response = &response;
1402
1403         child->pid = fork();
1404
1405         if (child->pid == -1) {
1406                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1407                 close(fdpair[0]);
1408                 close(fdpair[1]);
1409                 return False;
1410         }
1411
1412         if (child->pid != 0) {
1413                 /* Parent */
1414                 ssize_t nread;
1415
1416                 close(fdpair[0]);
1417
1418                 nread = sys_read(fdpair[1], &status, sizeof(status));
1419                 if (nread != sizeof(status)) {
1420                         DEBUG(1, ("fork_domain_child: Could not read child status: "
1421                                   "nread=%d, error=%s\n", (int)nread,
1422                                   strerror(errno)));
1423                         close(fdpair[1]);
1424                         return false;
1425                 }
1426                 if (!NT_STATUS_IS_OK(status)) {
1427                         DEBUG(1, ("fork_domain_child: Child status is %s\n",
1428                                   nt_errstr(status)));
1429                         close(fdpair[1]);
1430                         return false;
1431                 }
1432
1433                 child->next = child->prev = NULL;
1434                 DLIST_ADD(winbindd_children, child);
1435                 child->sock = fdpair[1];
1436                 return True;
1437         }
1438
1439         /* Child */
1440         child_domain = child->domain;
1441
1442         DEBUG(10, ("Child process %d\n", (int)getpid()));
1443
1444         state.cli.sock = fdpair[0];
1445         close(fdpair[1]);
1446
1447         status = winbindd_reinit_after_fork(child, child->logfilename);
1448
1449         nwritten = sys_write(state.cli.sock, &status, sizeof(status));
1450         if (nwritten != sizeof(status)) {
1451                 DEBUG(1, ("fork_domain_child: Could not write status: "
1452                           "nwritten=%d, error=%s\n", (int)nwritten,
1453                           strerror(errno)));
1454                 _exit(0);
1455         }
1456         if (!NT_STATUS_IS_OK(status)) {
1457                 DEBUG(1, ("winbindd_reinit_after_fork failed: %s\n",
1458                           nt_errstr(status)));
1459                 _exit(0);
1460         }
1461
1462         /* Handle online/offline messages. */
1463         messaging_register(winbind_messaging_context(), NULL,
1464                            MSG_WINBIND_OFFLINE, child_msg_offline);
1465         messaging_register(winbind_messaging_context(), NULL,
1466                            MSG_WINBIND_ONLINE, child_msg_online);
1467         messaging_register(winbind_messaging_context(), NULL,
1468                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1469         messaging_register(winbind_messaging_context(), NULL,
1470                            MSG_DEBUG, debug_message);
1471         messaging_register(winbind_messaging_context(), NULL,
1472                            MSG_WINBIND_IP_DROPPED,
1473                            winbind_msg_ip_dropped);
1474
1475
1476         primary_domain = find_our_domain();
1477
1478         if (primary_domain == NULL) {
1479                 smb_panic("no primary domain found");
1480         }
1481
1482         /* It doesn't matter if we allow cache login,
1483          * try to bring domain online after fork. */
1484         if ( child->domain ) {
1485                 child->domain->startup = True;
1486                 child->domain->startup_time = time_mono(NULL);
1487                 /* we can be in primary domain or in trusted domain
1488                  * If we are in trusted domain, set the primary domain
1489                  * in start-up mode */
1490                 if (!(child->domain->internal)) {
1491                         set_domain_online_request(child->domain);
1492                         if (!(child->domain->primary)) {
1493                                 primary_domain->startup = True;
1494                                 primary_domain->startup_time = time_mono(NULL);
1495                                 set_domain_online_request(primary_domain);
1496                         }
1497                 }
1498         }
1499
1500         /*
1501          * We are in idmap child, make sure that we set the
1502          * check_online_event to bring primary domain online.
1503          */
1504         if (child == idmap_child()) {
1505                 set_domain_online_request(primary_domain);
1506         }
1507
1508         /* We might be in the idmap child...*/
1509         if (child->domain && !(child->domain->internal) &&
1510             lp_winbind_offline_logon()) {
1511
1512                 set_domain_online_request(child->domain);
1513
1514                 if (primary_domain && (primary_domain != child->domain)) {
1515                         /* We need to talk to the primary
1516                          * domain as well as the trusted
1517                          * domain inside a trusted domain
1518                          * child.
1519                          * See the code in :
1520                          * set_dc_type_and_flags_trustinfo()
1521                          * for details.
1522                          */
1523                         set_domain_online_request(primary_domain);
1524                 }
1525
1526                 child->lockout_policy_event = tevent_add_timer(
1527                         winbind_event_context(), NULL, timeval_zero(),
1528                         account_lockout_policy_handler,
1529                         child);
1530         }
1531
1532         if (child->domain && child->domain->primary &&
1533             !USE_KERBEROS_KEYTAB &&
1534             lp_server_role() == ROLE_DOMAIN_MEMBER) {
1535
1536                 struct timeval next_change;
1537
1538                 if (calculate_next_machine_pwd_change(child->domain->name,
1539                                                        &next_change)) {
1540                         child->machine_password_change_event = tevent_add_timer(
1541                                 winbind_event_context(), NULL, next_change,
1542                                 machine_password_change_handler,
1543                                 child);
1544                 }
1545         }
1546
1547         fde = tevent_add_fd(winbind_event_context(), NULL, state.cli.sock,
1548                             TEVENT_FD_READ, child_handler, &state);
1549         if (fde == NULL) {
1550                 DEBUG(1, ("tevent_add_fd failed\n"));
1551                 _exit(1);
1552         }
1553
1554         while (1) {
1555
1556                 int ret;
1557                 TALLOC_CTX *frame = talloc_stackframe();
1558
1559                 ret = tevent_loop_once(winbind_event_context());
1560                 if (ret != 0) {
1561                         DEBUG(1, ("tevent_loop_once failed: %s\n",
1562                                   strerror(errno)));
1563                         _exit(1);
1564                 }
1565
1566                 if (child->domain && child->domain->startup &&
1567                                 (time_mono(NULL) > child->domain->startup_time + 30)) {
1568                         /* No longer in "startup" mode. */
1569                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1570                                 child->domain->name ));
1571                         child->domain->startup = False;
1572                 }
1573
1574                 TALLOC_FREE(frame);
1575         }
1576 }
1577
1578 void winbind_msg_ip_dropped_parent(struct messaging_context *msg_ctx,
1579                                    void *private_data,
1580                                    uint32_t msg_type,
1581                                    struct server_id server_id,
1582                                    DATA_BLOB *data)
1583 {
1584         struct winbindd_child *child;
1585
1586         winbind_msg_ip_dropped(msg_ctx, private_data, msg_type,
1587                                server_id, data);
1588
1589
1590         for (child = winbindd_children; child != NULL; child = child->next) {
1591                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
1592                                    msg_type, data->data, data->length);
1593         }
1594 }