source/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
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_WINBIND
  35
  36 extern bool override_logfile;
  37 extern struct winbindd_methods cache_methods;
  38
  39 /* Read some data from a client connection */
  40
  41 static void child_read_request(struct winbindd_cli_state *state)
  42 {
  43         NTSTATUS status;
  44
  45         /* Read data */
  46
  47         status = read_data(state->sock, (char *)&state->request,
  48                            sizeof(state->request));
  49
  50         if (!NT_STATUS_IS_OK(status)) {
  51                 DEBUG(3, ("child_read_request: read_data failed: %s\n",
  52                           nt_errstr(status)));
  53                 state->finished = True;
  54                 return;
  55         }
  56
  57         if (state->request.extra_len == 0) {
  58                 state->request.extra_data.data = NULL;
  59                 return;
  60         }
  61
  62         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request.extra_len));
  63
  64         state->request.extra_data.data =
  65                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
  66
  67         if (state->request.extra_data.data == NULL) {
  68                 DEBUG(0, ("malloc failed\n"));
  69                 state->finished = True;
  70                 return;
  71         }
  72
  73         /* Ensure null termination */
  74         state->request.extra_data.data[state->request.extra_len] = '\0';
  75
  76         status= read_data(state->sock, state->request.extra_data.data,
  77                           state->request.extra_len);
  78
  79         if (!NT_STATUS_IS_OK(status)) {
  80                 DEBUG(0, ("Could not read extra data: %s\n",
  81                           nt_errstr(status)));
  82                 state->finished = True;
  83                 return;
  84         }
  85 }
  86
  87 /*
  88  * Machinery for async requests sent to children. You set up a
  89  * winbindd_request, select a child to query, and issue a async_request
  90  * call. When the request is completed, the callback function you specified is
  91  * called back with the private pointer you gave to async_request.
  92  */
  93
  94 struct winbindd_async_request {
  95         struct winbindd_async_request *next, *prev;
  96         TALLOC_CTX *mem_ctx;
  97         struct winbindd_child *child;
  98         struct winbindd_request *request;
  99         struct winbindd_response *response;
 100         void (*continuation)(void *private_data, bool success);
 101         struct timed_event *reply_timeout_event;
 102         pid_t child_pid; /* pid of the child we're waiting on. Used to detect
 103                             a restart of the child (child->pid != child_pid). */
 104         void *private_data;
 105 };
 106
 107 static void async_request_fail(struct winbindd_async_request *state);
 108 static void async_main_request_sent(void *private_data, bool success);
 109 static void async_request_sent(void *private_data, bool success);
 110 static void async_reply_recv(void *private_data, bool success);
 111 static void schedule_async_request(struct winbindd_child *child);
 112
 113 void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
 114                    struct winbindd_request *request,
 115                    struct winbindd_response *response,
 116                    void (*continuation)(void *private_data, bool success),
 117                    void *private_data)
 118 {
 119         struct winbindd_async_request *state;
 120
 121         SMB_ASSERT(continuation != NULL);
 122
 123         state = TALLOC_P(mem_ctx, struct winbindd_async_request);
 124
 125         if (state == NULL) {
 126                 DEBUG(0, ("talloc failed\n"));
 127                 continuation(private_data, False);
 128                 return;
 129         }
 130
 131         state->mem_ctx = mem_ctx;
 132         state->child = child;
 133         state->reply_timeout_event = NULL;
 134         state->request = request;
 135         state->response = response;
 136         state->continuation = continuation;
 137         state->private_data = private_data;
 138
 139         DLIST_ADD_END(child->requests, state, struct winbindd_async_request *);
 140
 141         schedule_async_request(child);
 142
 143         return;
 144 }
 145
 146 static void async_main_request_sent(void *private_data, bool success)
 147 {
 148         struct winbindd_async_request *state =
 149                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 150
 151         if (!success) {
 152                 DEBUG(5, ("Could not send async request\n"));
 153                 async_request_fail(state);
 154                 return;
 155         }
 156
 157         if (state->request->extra_len == 0) {
 158                 async_request_sent(private_data, True);
 159                 return;
 160         }
 161
 162         setup_async_write(&state->child->event, state->request->extra_data.data,
 163                           state->request->extra_len,
 164                           async_request_sent, state);
 165 }
 166
 167 /****************************************************************
 168  Handler triggered if the child winbindd doesn't respond within
 169  a given timeout.
 170 ****************************************************************/
 171
 172 static void async_request_timeout_handler(struct event_context *ctx,
 173                                         struct timed_event *te,
 174                                         const struct timeval *now,
 175                                         void *private_data)
 176 {
 177         struct winbindd_async_request *state =
 178                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 179
 180         DEBUG(0,("async_request_timeout_handler: child pid %u is not responding. "
 181                 "Closing connection to it.\n",
 182                 state->child_pid ));
 183
 184         /* Deal with the reply - set to error. */
 185         async_reply_recv(private_data, False);
 186 }
 187
 188 /**************************************************************
 189  Common function called on both async send and recv fail.
 190  Cleans up the child and schedules the next request.
 191 **************************************************************/
 192
 193 static void async_request_fail(struct winbindd_async_request *state)
 194 {
 195         DLIST_REMOVE(state->child->requests, state);
 196
 197         TALLOC_FREE(state->reply_timeout_event);
 198
 199         /* If child exists and is not already reaped,
 200            send kill signal to child. */
 201
 202         if ((state->child->pid != (pid_t)0) &&
 203                         (state->child->pid != (pid_t)-1) &&
 204                         (state->child->pid == state->child_pid)) {
 205                 kill(state->child_pid, SIGTERM);
 206
 207                 /*
 208                  * Close the socket to the child.
 209                  */
 210                 winbind_child_died(state->child_pid);
 211         }
 212
 213         state->response->length = sizeof(struct winbindd_response);
 214         state->response->result = WINBINDD_ERROR;
 215         state->continuation(state->private_data, False);
 216 }
 217
 218 static void async_request_sent(void *private_data_data, bool success)
 219 {
 220         struct winbindd_async_request *state =
 221                 talloc_get_type_abort(private_data_data, struct winbindd_async_request);
 222
 223         if (!success) {
 224                 DEBUG(5, ("Could not send async request to child pid %u\n",
 225                         (unsigned int)state->child_pid ));
 226                 async_request_fail(state);
 227                 return;
 228         }
 229
 230         /* Request successfully sent to the child, setup the wait for reply */
 231
 232         setup_async_read(&state->child->event,
 233                          &state->response->result,
 234                          sizeof(state->response->result),
 235                          async_reply_recv, state);
 236
 237         /*
 238          * Set up a timeout of 300 seconds for the response.
 239          * If we don't get it close the child socket and
 240          * report failure.
 241          */
 242
 243         state->reply_timeout_event = event_add_timed(winbind_event_context(),
 244                                                         NULL,
 245                                                         timeval_current_ofs(300,0),
 246                                                         "async_request_timeout",
 247                                                         async_request_timeout_handler,
 248                                                         state);
 249         if (!state->reply_timeout_event) {
 250                 smb_panic("async_request_sent: failed to add timeout handler.\n");
 251         }
 252 }
 253
 254 static void async_reply_recv(void *private_data, bool success)
 255 {
 256         struct winbindd_async_request *state =
 257                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 258         struct winbindd_child *child = state->child;
 259
 260         TALLOC_FREE(state->reply_timeout_event);
 261
 262         state->response->length = sizeof(struct winbindd_response);
 263
 264         if (!success) {
 265                 DEBUG(5, ("Could not receive async reply from child pid %u\n",
 266                         (unsigned int)state->child_pid ));
 267
 268                 cache_cleanup_response(state->child_pid);
 269                 async_request_fail(state);
 270                 return;
 271         }
 272
 273         SMB_ASSERT(cache_retrieve_response(state->child_pid,
 274                                            state->response));
 275
 276         cache_cleanup_response(state->child_pid);
 277
 278         DLIST_REMOVE(child->requests, state);
 279
 280         schedule_async_request(child);
 281
 282         state->continuation(state->private_data, True);
 283 }
 284
 285 static bool fork_domain_child(struct winbindd_child *child);
 286
 287 static void schedule_async_request(struct winbindd_child *child)
 288 {
 289         struct winbindd_async_request *request = child->requests;
 290
 291         if (request == NULL) {
 292                 return;
 293         }
 294
 295         if (child->event.flags != 0) {
 296                 return;         /* Busy */
 297         }
 298
 299         if ((child->pid == 0) && (!fork_domain_child(child))) {
 300                 /* fork_domain_child failed.
 301                    Cancel all outstanding requests */
 302
 303                 while (request != NULL) {
 304                         /* request might be free'd in the continuation */
 305                         struct winbindd_async_request *next = request->next;
 306
 307                         async_request_fail(request);
 308                         request = next;
 309                 }
 310                 return;
 311         }
 312
 313         /* Now we know who we're sending to - remember the pid. */
 314         request->child_pid = child->pid;
 315
 316         setup_async_write(&child->event, request->request,
 317                           sizeof(*request->request),
 318                           async_main_request_sent, request);
 319
 320         return;
 321 }
 322
 323 struct domain_request_state {
 324         TALLOC_CTX *mem_ctx;
 325         struct winbindd_domain *domain;
 326         struct winbindd_request *request;
 327         struct winbindd_response *response;
 328         void (*continuation)(void *private_data_data, bool success);
 329         void *private_data_data;
 330 };
 331
 332 static void domain_init_recv(void *private_data_data, bool success);
 333
 334 void async_domain_request(TALLOC_CTX *mem_ctx,
 335                           struct winbindd_domain *domain,
 336                           struct winbindd_request *request,
 337                           struct winbindd_response *response,
 338                           void (*continuation)(void *private_data_data, bool success),
 339                           void *private_data_data)
 340 {
 341         struct domain_request_state *state;
 342
 343         if (domain->initialized) {
 344                 async_request(mem_ctx, &domain->child, request, response,
 345                               continuation, private_data_data);
 346                 return;
 347         }
 348
 349         state = TALLOC_P(mem_ctx, struct domain_request_state);
 350         if (state == NULL) {
 351                 DEBUG(0, ("talloc failed\n"));
 352                 continuation(private_data_data, False);
 353                 return;
 354         }
 355
 356         state->mem_ctx = mem_ctx;
 357         state->domain = domain;
 358         state->request = request;
 359         state->response = response;
 360         state->continuation = continuation;
 361         state->private_data_data = private_data_data;
 362
 363         init_child_connection(domain, domain_init_recv, state);
 364 }
 365
 366 static void domain_init_recv(void *private_data_data, bool success)
 367 {
 368         struct domain_request_state *state =
 369                 talloc_get_type_abort(private_data_data, struct domain_request_state);
 370
 371         if (!success) {
 372                 DEBUG(5, ("Domain init returned an error\n"));
 373                 state->continuation(state->private_data_data, False);
 374                 return;
 375         }
 376
 377         async_request(state->mem_ctx, &state->domain->child,
 378                       state->request, state->response,
 379                       state->continuation, state->private_data_data);
 380 }
 381
 382 static void recvfrom_child(void *private_data_data, bool success)
 383 {
 384         struct winbindd_cli_state *state =
 385                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 386         enum winbindd_result result = state->response.result;
 387
 388         /* This is an optimization: The child has written directly to the
 389          * response buffer. The request itself is still in pending state,
 390          * state that in the result code. */
 391
 392         state->response.result = WINBINDD_PENDING;
 393
 394         if ((!success) || (result != WINBINDD_OK)) {
 395                 request_error(state);
 396                 return;
 397         }
 398
 399         request_ok(state);
 400 }
 401
 402 void sendto_child(struct winbindd_cli_state *state,
 403                   struct winbindd_child *child)
 404 {
 405         async_request(state->mem_ctx, child, &state->request,
 406                       &state->response, recvfrom_child, state);
 407 }
 408
 409 void sendto_domain(struct winbindd_cli_state *state,
 410                    struct winbindd_domain *domain)
 411 {
 412         async_domain_request(state->mem_ctx, domain,
 413                              &state->request, &state->response,
 414                              recvfrom_child, state);
 415 }
 416
 417 static void child_process_request(struct winbindd_child *child,
 418                                   struct winbindd_cli_state *state)
 419 {
 420         struct winbindd_domain *domain = child->domain;
 421         const struct winbindd_child_dispatch_table *table = child->table;
 422
 423         /* Free response data - we may be interrupted and receive another
 424            command before being able to send this data off. */
 425
 426         state->response.result = WINBINDD_ERROR;
 427         state->response.length = sizeof(struct winbindd_response);
 428
 429         /* as all requests in the child are sync, we can use talloc_tos() */
 430         state->mem_ctx = talloc_tos();
 431
 432         /* Process command */
 433
 434         for (; table->name; table++) {
 435                 if (state->request.cmd == table->struct_cmd) {
 436                         DEBUG(10,("child_process_request: request fn %s\n",
 437                                   table->name));
 438                         state->response.result = table->struct_fn(domain, state);
 439                         return;
 440                 }
 441         }
 442
 443         DEBUG(1 ,("child_process_request: unknown request fn number %d\n",
 444                   (int)state->request.cmd));
 445         state->response.result = WINBINDD_ERROR;
 446 }
 447
 448 void setup_child(struct winbindd_child *child,
 449                  const struct winbindd_child_dispatch_table *table,
 450                  const char *logprefix,
 451                  const char *logname)
 452 {
 453         if (logprefix && logname) {
 454                 if (asprintf(&child->logfilename, "%s/%s-%s",
 455                              get_dyn_LOGFILEBASE(), logprefix, logname) < 0) {
 456                         smb_panic("Internal error: asprintf failed");
 457                 }
 458         } else {
 459                 smb_panic("Internal error: logprefix == NULL && "
 460                           "logname == NULL");
 461         }
 462
 463         child->domain = NULL;
 464         child->table = table;
 465 }
 466
 467 struct winbindd_child *children = NULL;
 468
 469 void winbind_child_died(pid_t pid)
 470 {
 471         struct winbindd_child *child;
 472
 473         for (child = children; child != NULL; child = child->next) {
 474                 if (child->pid == pid) {
 475                         break;
 476                 }
 477         }
 478
 479         if (child == NULL) {
 480                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 481                 return;
 482         }
 483
 484         /* This will be re-added in fork_domain_child() */
 485
 486         DLIST_REMOVE(children, child);
 487
 488         remove_fd_event(&child->event);
 489         close(child->event.fd);
 490         child->event.fd = 0;
 491         child->event.flags = 0;
 492         child->pid = 0;
 493
 494         schedule_async_request(child);
 495 }
 496
 497 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 498
 499 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 500 {
 501         flush_negative_conn_cache_for_domain(domain->name);
 502         if (*domain->alt_name) {
 503                 flush_negative_conn_cache_for_domain(domain->alt_name);
 504         }
 505 }
 506
 507 /*
 508  * Parent winbindd process sets its own debug level first and then
 509  * sends a message to all the winbindd children to adjust their debug
 510  * level to that of parents.
 511  */
 512
 513 void winbind_msg_debug(struct messaging_context *msg_ctx,
 514                          void *private_data,
 515                          uint32_t msg_type,
 516                          struct server_id server_id,
 517                          DATA_BLOB *data)
 518 {
 519         struct winbindd_child *child;
 520
 521         DEBUG(10,("winbind_msg_debug: got debug message.\n"));
 522
 523         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 524
 525         for (child = children; child != NULL; child = child->next) {
 526
 527                 DEBUG(10,("winbind_msg_debug: sending message to pid %u.\n",
 528                         (unsigned int)child->pid));
 529
 530                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 531                            MSG_DEBUG,
 532                            data->data,
 533                            strlen((char *) data->data) + 1);
 534         }
 535 }
 536
 537 /* Set our domains as offline and forward the offline message to our children. */
 538
 539 void winbind_msg_offline(struct messaging_context *msg_ctx,
 540                          void *private_data,
 541                          uint32_t msg_type,
 542                          struct server_id server_id,
 543                          DATA_BLOB *data)
 544 {
 545         struct winbindd_child *child;
 546         struct winbindd_domain *domain;
 547
 548         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 549
 550         if (!lp_winbind_offline_logon()) {
 551                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 552                 return;
 553         }
 554
 555         /* Set our global state as offline. */
 556         if (!set_global_winbindd_state_offline()) {
 557                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 558                 return;
 559         }
 560
 561         /* Set all our domains as offline. */
 562         for (domain = domain_list(); domain; domain = domain->next) {
 563                 if (domain->internal) {
 564                         continue;
 565                 }
 566                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 567                 set_domain_offline(domain);
 568         }
 569
 570         for (child = children; child != NULL; child = child->next) {
 571                 /* Don't send message to internal childs.  We've already
 572                    done so above. */
 573                 if (!child->domain || winbindd_internal_child(child)) {
 574                         continue;
 575                 }
 576
 577                 /* Or internal domains (this should not be possible....) */
 578                 if (child->domain->internal) {
 579                         continue;
 580                 }
 581
 582                 /* Each winbindd child should only process requests for one domain - make sure
 583                    we only set it online / offline for that domain. */
 584
 585                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 586                         (unsigned int)child->pid, domain->name ));
 587
 588                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 589                                    MSG_WINBIND_OFFLINE,
 590                                    (uint8 *)child->domain->name,
 591                                    strlen(child->domain->name)+1);
 592         }
 593 }
 594
 595 /* Set our domains as online and forward the online message to our children. */
 596
 597 void winbind_msg_online(struct messaging_context *msg_ctx,
 598                         void *private_data,
 599                         uint32_t msg_type,
 600                         struct server_id server_id,
 601                         DATA_BLOB *data)
 602 {
 603         struct winbindd_child *child;
 604         struct winbindd_domain *domain;
 605
 606         DEBUG(10,("winbind_msg_online: got online message.\n"));
 607
 608         if (!lp_winbind_offline_logon()) {
 609                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 610                 return;
 611         }
 612
 613         /* Set our global state as online. */
 614         set_global_winbindd_state_online();
 615
 616         smb_nscd_flush_user_cache();
 617         smb_nscd_flush_group_cache();
 618
 619         /* Set all our domains as online. */
 620         for (domain = domain_list(); domain; domain = domain->next) {
 621                 if (domain->internal) {
 622                         continue;
 623                 }
 624                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 625
 626                 winbindd_flush_negative_conn_cache(domain);
 627                 set_domain_online_request(domain);
 628
 629                 /* Send an online message to the idmap child when our
 630                    primary domain comes back online */
 631
 632                 if ( domain->primary ) {
 633                         struct winbindd_child *idmap = idmap_child();
 634
 635                         if ( idmap->pid != 0 ) {
 636                                 messaging_send_buf(msg_ctx,
 637                                                    pid_to_procid(idmap->pid),
 638                                                    MSG_WINBIND_ONLINE,
 639                                                    (uint8 *)domain->name,
 640                                                    strlen(domain->name)+1);
 641                         }
 642
 643                 }
 644         }
 645
 646         for (child = children; child != NULL; child = child->next) {
 647                 /* Don't send message to internal childs. */
 648                 if (!child->domain || winbindd_internal_child(child)) {
 649                         continue;
 650                 }
 651
 652                 /* Or internal domains (this should not be possible....) */
 653                 if (child->domain->internal) {
 654                         continue;
 655                 }
 656
 657                 /* Each winbindd child should only process requests for one domain - make sure
 658                    we only set it online / offline for that domain. */
 659
 660                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 661                         (unsigned int)child->pid, child->domain->name ));
 662
 663                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 664                                    MSG_WINBIND_ONLINE,
 665                                    (uint8 *)child->domain->name,
 666                                    strlen(child->domain->name)+1);
 667         }
 668 }
 669
 670 /* Forward the online/offline messages to our children. */
 671 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 672                               void *private_data,
 673                               uint32_t msg_type,
 674                               struct server_id server_id,
 675                               DATA_BLOB *data)
 676 {
 677         struct winbindd_child *child;
 678
 679         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 680
 681         for (child = children; child != NULL; child = child->next) {
 682                 if (child->domain && child->domain->primary) {
 683                         DEBUG(10,("winbind_msg_onlinestatus: "
 684                                   "sending message to pid %u of primary domain.\n",
 685                                   (unsigned int)child->pid));
 686                         messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 687                                            MSG_WINBIND_ONLINESTATUS,
 688                                            (uint8 *)data->data,
 689                                            data->length);
 690                         break;
 691                 }
 692         }
 693 }
 694
 695 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 696                                  void *private_data,
 697                                  uint32_t msg_type,
 698                                  struct server_id server_id,
 699                                  DATA_BLOB *data)
 700 {
 701         struct winbindd_child *child;
 702
 703         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 704
 705         dump_event_list(winbind_event_context());
 706
 707         for (child = children; child != NULL; child = child->next) {
 708
 709                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 710                         (unsigned int)child->pid));
 711
 712                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 713                                    MSG_DUMP_EVENT_LIST,
 714                                    NULL, 0);
 715         }
 716
 717 }
 718
 719 void winbind_msg_dump_domain_list(struct messaging_context *msg_ctx,
 720                                   void *private_data,
 721                                   uint32_t msg_type,
 722                                   struct server_id server_id,
 723                                   DATA_BLOB *data)
 724 {
 725         TALLOC_CTX *mem_ctx;
 726         const char *message = NULL;
 727         struct server_id *sender = NULL;
 728         const char *domain = NULL;
 729         char *s = NULL;
 730         NTSTATUS status;
 731         struct winbindd_domain *dom = NULL;
 732
 733         DEBUG(5,("winbind_msg_dump_domain_list received.\n"));
 734
 735         if (!data || !data->data) {
 736                 return;
 737         }
 738
 739         if (data->length < sizeof(struct server_id)) {
 740                 return;
 741         }
 742
 743         mem_ctx = talloc_init("winbind_msg_dump_domain_list");
 744         if (!mem_ctx) {
 745                 return;
 746         }
 747
 748         sender = (struct server_id *)data->data;
 749         if (data->length > sizeof(struct server_id)) {
 750                 domain = (const char *)data->data+sizeof(struct server_id);
 751         }
 752
 753         if (domain) {
 754
 755                 DEBUG(5,("winbind_msg_dump_domain_list for domain: %s\n",
 756                         domain));
 757
 758                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain,
 759                                                   find_domain_from_name_noinit(domain));
 760                 if (!message) {
 761                         talloc_destroy(mem_ctx);
 762                         return;
 763                 }
 764
 765                 messaging_send_buf(msg_ctx, *sender,
 766                                    MSG_WINBIND_DUMP_DOMAIN_LIST,
 767                                    (uint8_t *)message, strlen(message) + 1);
 768
 769                 talloc_destroy(mem_ctx);
 770
 771                 return;
 772         }
 773
 774         DEBUG(5,("winbind_msg_dump_domain_list all domains\n"));
 775
 776         for (dom = domain_list(); dom; dom=dom->next) {
 777                 message = NDR_PRINT_STRUCT_STRING(mem_ctx, winbindd_domain, dom);
 778                 if (!message) {
 779                         talloc_destroy(mem_ctx);
 780                         return;
 781                 }
 782
 783                 s = talloc_asprintf_append(s, "%s\n", message);
 784                 if (!s) {
 785                         talloc_destroy(mem_ctx);
 786                         return;
 787                 }
 788         }
 789
 790         status = messaging_send_buf(msg_ctx, *sender,
 791                                     MSG_WINBIND_DUMP_DOMAIN_LIST,
 792                                     (uint8_t *)s, strlen(s) + 1);
 793         if (!NT_STATUS_IS_OK(status)) {
 794                 DEBUG(0,("failed to send message: %s\n",
 795                 nt_errstr(status)));
 796         }
 797
 798         talloc_destroy(mem_ctx);
 799 }
 800
 801 static void account_lockout_policy_handler(struct event_context *ctx,
 802                                            struct timed_event *te,
 803                                            const struct timeval *now,
 804                                            void *private_data)
 805 {
 806         struct winbindd_child *child =
 807                 (struct winbindd_child *)private_data;
 808         TALLOC_CTX *mem_ctx = NULL;
 809         struct winbindd_methods *methods;
 810         struct samr_DomInfo12 lockout_policy;
 811         NTSTATUS result;
 812
 813         DEBUG(10,("account_lockout_policy_handler called\n"));
 814
 815         TALLOC_FREE(child->lockout_policy_event);
 816
 817         if ( !winbindd_can_contact_domain( child->domain ) ) {
 818                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 819                           "do not have an incoming trust to domain %s\n",
 820                           child->domain->name));
 821
 822                 return;
 823         }
 824
 825         methods = child->domain->methods;
 826
 827         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 828         if (!mem_ctx) {
 829                 result = NT_STATUS_NO_MEMORY;
 830         } else {
 831                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 832         }
 833         TALLOC_FREE(mem_ctx);
 834
 835         if (!NT_STATUS_IS_OK(result)) {
 836                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 837                          nt_errstr(result)));
 838         }
 839
 840         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 841                                                       timeval_current_ofs(3600, 0),
 842                                                       "account_lockout_policy_handler",
 843                                                       account_lockout_policy_handler,
 844                                                       child);
 845 }
 846
 847 /* Deal with a request to go offline. */
 848
 849 static void child_msg_offline(struct messaging_context *msg,
 850                               void *private_data,
 851                               uint32_t msg_type,
 852                               struct server_id server_id,
 853                               DATA_BLOB *data)
 854 {
 855         struct winbindd_domain *domain;
 856         const char *domainname = (const char *)data->data;
 857
 858         if (data->data == NULL || data->length == 0) {
 859                 return;
 860         }
 861
 862         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 863
 864         if (!lp_winbind_offline_logon()) {
 865                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 866                 return;
 867         }
 868
 869         /* Mark the requested domain offline. */
 870
 871         for (domain = domain_list(); domain; domain = domain->next) {
 872                 if (domain->internal) {
 873                         continue;
 874                 }
 875                 if (strequal(domain->name, domainname)) {
 876                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 877                         set_domain_offline(domain);
 878                 }
 879         }
 880 }
 881
 882 /* Deal with a request to go online. */
 883
 884 static void child_msg_online(struct messaging_context *msg,
 885                              void *private_data,
 886                              uint32_t msg_type,
 887                              struct server_id server_id,
 888                              DATA_BLOB *data)
 889 {
 890         struct winbindd_domain *domain;
 891         const char *domainname = (const char *)data->data;
 892
 893         if (data->data == NULL || data->length == 0) {
 894                 return;
 895         }
 896
 897         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 898
 899         if (!lp_winbind_offline_logon()) {
 900                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 901                 return;
 902         }
 903
 904         /* Set our global state as online. */
 905         set_global_winbindd_state_online();
 906
 907         /* Try and mark everything online - delete any negative cache entries
 908            to force a reconnect now. */
 909
 910         for (domain = domain_list(); domain; domain = domain->next) {
 911                 if (domain->internal) {
 912                         continue;
 913                 }
 914                 if (strequal(domain->name, domainname)) {
 915                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 916                         winbindd_flush_negative_conn_cache(domain);
 917                         set_domain_online_request(domain);
 918                 }
 919         }
 920 }
 921
 922 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 923 {
 924         struct winbindd_domain *domain;
 925         char *buf = NULL;
 926
 927         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 928                                    get_global_winbindd_state_offline() ?
 929                                    "Offline":"Online")) == NULL) {
 930                 return NULL;
 931         }
 932
 933         for (domain = domain_list(); domain; domain = domain->next) {
 934                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 935                                                   domain->name,
 936                                                   domain->online ?
 937                                                   "Online":"Offline")) == NULL) {
 938                         return NULL;
 939                 }
 940         }
 941
 942         buf = talloc_asprintf_append_buffer(buf, "\n");
 943
 944         DEBUG(5,("collect_onlinestatus: %s", buf));
 945
 946         return buf;
 947 }
 948
 949 static void child_msg_onlinestatus(struct messaging_context *msg_ctx,
 950                                    void *private_data,
 951                                    uint32_t msg_type,
 952                                    struct server_id server_id,
 953                                    DATA_BLOB *data)
 954 {
 955         TALLOC_CTX *mem_ctx;
 956         const char *message;
 957         struct server_id *sender;
 958
 959         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 960
 961         if (!data->data) {
 962                 return;
 963         }
 964
 965         sender = (struct server_id *)data->data;
 966
 967         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 968         if (mem_ctx == NULL) {
 969                 return;
 970         }
 971
 972         message = collect_onlinestatus(mem_ctx);
 973         if (message == NULL) {
 974                 talloc_destroy(mem_ctx);
 975                 return;
 976         }
 977
 978         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 979                            (uint8 *)message, strlen(message) + 1);
 980
 981         talloc_destroy(mem_ctx);
 982 }
 983
 984 static void child_msg_dump_event_list(struct messaging_context *msg,
 985                                       void *private_data,
 986                                       uint32_t msg_type,
 987                                       struct server_id server_id,
 988                                       DATA_BLOB *data)
 989 {
 990         DEBUG(5,("child_msg_dump_event_list received\n"));
 991
 992         dump_event_list(winbind_event_context());
 993 }
 994
 995
 996 static bool fork_domain_child(struct winbindd_child *child)
 997 {
 998         int fdpair[2];
 999         struct winbindd_cli_state state;
1000         struct winbindd_domain *domain;
1001         struct winbindd_domain *primary_domain = NULL;
1002
1003         if (child->domain) {
1004                 DEBUG(10, ("fork_domain_child called for domain '%s'\n",
1005                            child->domain->name));
1006         } else {
1007                 DEBUG(10, ("fork_domain_child called without domain.\n"));
1008         }
1009
1010         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
1011                 DEBUG(0, ("Could not open child pipe: %s\n",
1012                           strerror(errno)));
1013                 return False;
1014         }
1015
1016         ZERO_STRUCT(state);
1017         state.pid = sys_getpid();
1018
1019         child->pid = sys_fork();
1020
1021         if (child->pid == -1) {
1022                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
1023                 return False;
1024         }
1025
1026         if (child->pid != 0) {
1027                 /* Parent */
1028                 close(fdpair[0]);
1029                 child->next = child->prev = NULL;
1030                 DLIST_ADD(children, child);
1031                 child->event.fd = fdpair[1];
1032                 child->event.flags = 0;
1033                 child->requests = NULL;
1034                 add_fd_event(&child->event);
1035                 return True;
1036         }
1037
1038         /* Child */
1039
1040         DEBUG(10, ("Child process %d\n", (int)sys_getpid()));
1041
1042         /* Stop zombies in children */
1043         CatchChild();
1044
1045         state.sock = fdpair[0];
1046         close(fdpair[1]);
1047
1048         if (!reinit_after_fork(winbind_messaging_context(), true)) {
1049                 DEBUG(0,("reinit_after_fork() failed\n"));
1050                 _exit(0);
1051         }
1052
1053         close_conns_after_fork();
1054
1055         if (!override_logfile) {
1056                 lp_set_logfile(child->logfilename);
1057                 reopen_logs();
1058         }
1059
1060         /*
1061          * For clustering, we need to re-init our ctdbd connection after the
1062          * fork
1063          */
1064         if (!NT_STATUS_IS_OK(messaging_reinit(winbind_messaging_context())))
1065                 exit(1);
1066
1067         /* Don't handle the same messages as our parent. */
1068         messaging_deregister(winbind_messaging_context(),
1069                              MSG_SMB_CONF_UPDATED, NULL);
1070         messaging_deregister(winbind_messaging_context(),
1071                              MSG_SHUTDOWN, NULL);
1072         messaging_deregister(winbind_messaging_context(),
1073                              MSG_WINBIND_OFFLINE, NULL);
1074         messaging_deregister(winbind_messaging_context(),
1075                              MSG_WINBIND_ONLINE, NULL);
1076         messaging_deregister(winbind_messaging_context(),
1077                              MSG_WINBIND_ONLINESTATUS, NULL);
1078         messaging_deregister(winbind_messaging_context(),
1079                              MSG_DUMP_EVENT_LIST, NULL);
1080         messaging_deregister(winbind_messaging_context(),
1081                              MSG_WINBIND_DUMP_DOMAIN_LIST, NULL);
1082         messaging_deregister(winbind_messaging_context(),
1083                              MSG_DEBUG, NULL);
1084
1085         /* Handle online/offline messages. */
1086         messaging_register(winbind_messaging_context(), NULL,
1087                            MSG_WINBIND_OFFLINE, child_msg_offline);
1088         messaging_register(winbind_messaging_context(), NULL,
1089                            MSG_WINBIND_ONLINE, child_msg_online);
1090         messaging_register(winbind_messaging_context(), NULL,
1091                            MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus);
1092         messaging_register(winbind_messaging_context(), NULL,
1093                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1094         messaging_register(winbind_messaging_context(), NULL,
1095                            MSG_DEBUG, debug_message);
1096
1097         if ( child->domain ) {
1098                 child->domain->startup = True;
1099                 child->domain->startup_time = time(NULL);
1100         }
1101
1102         /* Ensure we have no pending check_online events other
1103            than one for this domain or the primary domain. */
1104
1105         for (domain = domain_list(); domain; domain = domain->next) {
1106                 if (domain->primary) {
1107                         primary_domain = domain;
1108                 }
1109                 if ((domain != child->domain) && !domain->primary) {
1110                         TALLOC_FREE(domain->check_online_event);
1111                 }
1112         }
1113
1114         if (primary_domain == NULL) {
1115                 smb_panic("no primary domain found");
1116         }
1117
1118         /* Ensure we're not handling an event inherited from
1119            our parent. */
1120
1121         cancel_named_event(winbind_event_context(),
1122                            "krb5_ticket_refresh_handler");
1123
1124         /* We might be in the idmap child...*/
1125         if (child->domain && !(child->domain->internal) &&
1126             lp_winbind_offline_logon()) {
1127
1128                 set_domain_online_request(child->domain);
1129
1130                 if (primary_domain != child->domain) {
1131                         /* We need to talk to the primary
1132                          * domain as well as the trusted
1133                          * domain inside a trusted domain
1134                          * child.
1135                          * See the code in :
1136                          * set_dc_type_and_flags_trustinfo()
1137                          * for details.
1138                          */
1139                         set_domain_online_request(primary_domain);
1140                 }
1141
1142                 child->lockout_policy_event = event_add_timed(
1143                         winbind_event_context(), NULL, timeval_zero(),
1144                         "account_lockout_policy_handler",
1145                         account_lockout_policy_handler,
1146                         child);
1147         }
1148
1149         while (1) {
1150
1151                 int ret;
1152                 fd_set read_fds;
1153                 struct timeval t;
1154                 struct timeval *tp;
1155                 struct timeval now;
1156                 TALLOC_CTX *frame = talloc_stackframe();
1157
1158                 /* check for signals */
1159                 winbind_check_sigterm(false);
1160                 winbind_check_sighup(override_logfile ? NULL :
1161                                 child->logfilename);
1162
1163                 run_events(winbind_event_context(), 0, NULL, NULL);
1164
1165                 GetTimeOfDay(&now);
1166
1167                 if (child->domain && child->domain->startup &&
1168                                 (now.tv_sec > child->domain->startup_time + 30)) {
1169                         /* No longer in "startup" mode. */
1170                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1171                                 child->domain->name ));
1172                         child->domain->startup = False;
1173                 }
1174
1175                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1176                 if (tp) {
1177                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1178                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1179                 }
1180
1181                 /* Handle messages */
1182
1183                 message_dispatch(winbind_messaging_context());
1184
1185                 FD_ZERO(&read_fds);
1186                 FD_SET(state.sock, &read_fds);
1187
1188                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
1189
1190                 if (ret == 0) {
1191                         DEBUG(11,("nothing is ready yet, continue\n"));
1192                         TALLOC_FREE(frame);
1193                         continue;
1194                 }
1195
1196                 if (ret == -1 && errno == EINTR) {
1197                         /* We got a signal - continue. */
1198                         TALLOC_FREE(frame);
1199                         continue;
1200                 }
1201
1202                 if (ret == -1 && errno != EINTR) {
1203                         DEBUG(0,("select error occured\n"));
1204                         TALLOC_FREE(frame);
1205                         perror("select");
1206                         return False;
1207                 }
1208
1209                 /* fetch a request from the main daemon */
1210                 child_read_request(&state);
1211
1212                 if (state.finished) {
1213                         /* we lost contact with our parent */
1214                         exit(0);
1215                 }
1216
1217                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
1218
1219                 ZERO_STRUCT(state.response);
1220                 state.request.null_term = '\0';
1221                 child_process_request(child, &state);
1222
1223                 SAFE_FREE(state.request.extra_data.data);
1224
1225                 cache_store_response(sys_getpid(), &state.response);
1226
1227                 SAFE_FREE(state.response.extra_data.data);
1228
1229                 /* We just send the result code back, the result
1230                  * structure needs to be fetched via the
1231                  * winbindd_cache. Hmm. That needs fixing... */
1232
1233                 if (write_data(state.sock,
1234                                (const char *)&state.response.result,
1235                                sizeof(state.response.result)) !=
1236                     sizeof(state.response.result)) {
1237                         DEBUG(0, ("Could not write result\n"));
1238                         exit(1);
1239                 }
1240                 TALLOC_FREE(frame);
1241         }
1242 }