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
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS DBGC_WINBIND
  35
  36 extern bool override_logfile;
  37
  38 /* Read some data from a client connection */
  39
  40 static void child_read_request(struct winbindd_cli_state *state)
  41 {
  42         ssize_t len;
  43
  44         /* Read data */
  45
  46         len = read_data(state->sock, (char *)&state->request,
  47                         sizeof(state->request), NULL);
  48
  49         if (len != sizeof(state->request)) {
  50                 DEBUG(len > 0 ? 0 : 3, ("Got invalid request length: %d\n", (int)len));
  51                 state->finished = True;
  52                 return;
  53         }
  54
  55         if (state->request.extra_len == 0) {
  56                 state->request.extra_data.data = NULL;
  57                 return;
  58         }
  59
  60         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request.extra_len));
  61
  62         state->request.extra_data.data =
  63                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
  64
  65         if (state->request.extra_data.data == NULL) {
  66                 DEBUG(0, ("malloc failed\n"));
  67                 state->finished = True;
  68                 return;
  69         }
  70
  71         /* Ensure null termination */
  72         state->request.extra_data.data[state->request.extra_len] = '\0';
  73
  74         len = read_data(state->sock, state->request.extra_data.data,
  75                         state->request.extra_len, NULL);
  76
  77         if (len != state->request.extra_len) {
  78                 DEBUG(0, ("Could not read extra data\n"));
  79                 state->finished = True;
  80                 return;
  81         }
  82 }
  83
  84 /*
  85  * Machinery for async requests sent to children. You set up a
  86  * winbindd_request, select a child to query, and issue a async_request
  87  * call. When the request is completed, the callback function you specified is
  88  * called back with the private pointer you gave to async_request.
  89  */
  90
  91 struct winbindd_async_request {
  92         struct winbindd_async_request *next, *prev;
  93         TALLOC_CTX *mem_ctx;
  94         struct winbindd_child *child;
  95         struct winbindd_request *request;
  96         struct winbindd_response *response;
  97         void (*continuation)(void *private_data, bool success);
  98         struct timed_event *reply_timeout_event;
  99         pid_t child_pid; /* pid of the child we're waiting on. Used to detect
 100                             a restart of the child (child->pid != child_pid). */
 101         void *private_data;
 102 };
 103
 104 static void async_main_request_sent(void *private_data, bool success);
 105 static void async_request_sent(void *private_data, bool success);
 106 static void async_reply_recv(void *private_data, bool success);
 107 static void schedule_async_request(struct winbindd_child *child);
 108
 109 void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
 110                    struct winbindd_request *request,
 111                    struct winbindd_response *response,
 112                    void (*continuation)(void *private_data, bool success),
 113                    void *private_data)
 114 {
 115         struct winbindd_async_request *state;
 116
 117         SMB_ASSERT(continuation != NULL);
 118
 119         state = TALLOC_P(mem_ctx, struct winbindd_async_request);
 120
 121         if (state == NULL) {
 122                 DEBUG(0, ("talloc failed\n"));
 123                 continuation(private_data, False);
 124                 return;
 125         }
 126
 127         state->mem_ctx = mem_ctx;
 128         state->child = child;
 129         state->request = request;
 130         state->response = response;
 131         state->continuation = continuation;
 132         state->private_data = private_data;
 133
 134         DLIST_ADD_END(child->requests, state, struct winbindd_async_request *);
 135
 136         schedule_async_request(child);
 137
 138         return;
 139 }
 140
 141 static void async_main_request_sent(void *private_data, bool success)
 142 {
 143         struct winbindd_async_request *state =
 144                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 145
 146         if (!success) {
 147                 DEBUG(5, ("Could not send async request\n"));
 148
 149                 state->response->length = sizeof(struct winbindd_response);
 150                 state->response->result = WINBINDD_ERROR;
 151                 state->continuation(state->private_data, False);
 152                 return;
 153         }
 154
 155         if (state->request->extra_len == 0) {
 156                 async_request_sent(private_data, True);
 157                 return;
 158         }
 159
 160         setup_async_write(&state->child->event, state->request->extra_data.data,
 161                           state->request->extra_len,
 162                           async_request_sent, state);
 163 }
 164
 165 /****************************************************************
 166  Handler triggered if the child winbindd doesn't respond within
 167  a given timeout.
 168 ****************************************************************/
 169
 170 static void async_request_timeout_handler(struct event_context *ctx,
 171                                         struct timed_event *te,
 172                                         const struct timeval *now,
 173                                         void *private_data)
 174 {
 175         struct winbindd_async_request *state =
 176                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 177
 178         DEBUG(0,("async_request_timeout_handler: child pid %u is not responding. "
 179                 "Closing connection to it.\n",
 180                 state->child_pid ));
 181
 182         /* Deal with the reply - set to error. */
 183         async_reply_recv(private_data, False);
 184 }
 185
 186 /**************************************************************
 187  Common function called on both async send and recv fail.
 188  Cleans up the child and schedules the next request.
 189 **************************************************************/
 190
 191 static void async_request_fail(struct winbindd_async_request *state)
 192 {
 193         DLIST_REMOVE(state->child->requests, state);
 194
 195         TALLOC_FREE(state->reply_timeout_event);
 196
 197         SMB_ASSERT(state->child_pid != (pid_t)0);
 198
 199         /* If not already reaped, send kill signal to child. */
 200         if (state->child->pid == state->child_pid) {
 201                 kill(state->child_pid, SIGTERM);
 202
 203                 /*
 204                  * Close the socket to the child.
 205                  */
 206                 winbind_child_died(state->child_pid);
 207         }
 208
 209         state->response->length = sizeof(struct winbindd_response);
 210         state->response->result = WINBINDD_ERROR;
 211         state->continuation(state->private_data, False);
 212 }
 213
 214 static void async_request_sent(void *private_data_data, bool success)
 215 {
 216         struct winbindd_async_request *state =
 217                 talloc_get_type_abort(private_data_data, struct winbindd_async_request);
 218
 219         if (!success) {
 220                 DEBUG(5, ("Could not send async request to child pid %u\n",
 221                         (unsigned int)state->child_pid ));
 222                 async_request_fail(state);
 223                 return;
 224         }
 225
 226         /* Request successfully sent to the child, setup the wait for reply */
 227
 228         setup_async_read(&state->child->event,
 229                          &state->response->result,
 230                          sizeof(state->response->result),
 231                          async_reply_recv, state);
 232
 233         /*
 234          * Set up a timeout of 300 seconds for the response.
 235          * If we don't get it close the child socket and
 236          * report failure.
 237          */
 238
 239         state->reply_timeout_event = event_add_timed(winbind_event_context(),
 240                                                         NULL,
 241                                                         timeval_current_ofs(300,0),
 242                                                         "async_request_timeout",
 243                                                         async_request_timeout_handler,
 244                                                         state);
 245         if (!state->reply_timeout_event) {
 246                 smb_panic("async_request_sent: failed to add timeout handler.\n");
 247         }
 248 }
 249
 250 static void async_reply_recv(void *private_data, bool success)
 251 {
 252         struct winbindd_async_request *state =
 253                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 254         struct winbindd_child *child = state->child;
 255
 256         TALLOC_FREE(state->reply_timeout_event);
 257
 258         state->response->length = sizeof(struct winbindd_response);
 259
 260         if (!success) {
 261                 DEBUG(5, ("Could not receive async reply from child pid %u\n",
 262                         (unsigned int)state->child_pid ));
 263
 264                 cache_cleanup_response(state->child_pid);
 265                 async_request_fail(state);
 266                 return;
 267         }
 268
 269         SMB_ASSERT(cache_retrieve_response(state->child_pid,
 270                                            state->response));
 271
 272         cache_cleanup_response(state->child_pid);
 273
 274         DLIST_REMOVE(child->requests, state);
 275
 276         schedule_async_request(child);
 277
 278         state->continuation(state->private_data, True);
 279 }
 280
 281 static bool fork_domain_child(struct winbindd_child *child);
 282
 283 static void schedule_async_request(struct winbindd_child *child)
 284 {
 285         struct winbindd_async_request *request = child->requests;
 286
 287         if (request == NULL) {
 288                 return;
 289         }
 290
 291         if (child->event.flags != 0) {
 292                 return;         /* Busy */
 293         }
 294
 295         if ((child->pid == 0) && (!fork_domain_child(child))) {
 296                 /* Cancel all outstanding requests */
 297
 298                 while (request != NULL) {
 299                         /* request might be free'd in the continuation */
 300                         struct winbindd_async_request *next = request->next;
 301                         request->continuation(request->private_data, False);
 302                         request = next;
 303                 }
 304                 return;
 305         }
 306
 307         /* Now we know who we're sending to - remember the pid. */
 308         request->child_pid = child->pid;
 309
 310         setup_async_write(&child->event, request->request,
 311                           sizeof(*request->request),
 312                           async_main_request_sent, request);
 313
 314         return;
 315 }
 316
 317 struct domain_request_state {
 318         TALLOC_CTX *mem_ctx;
 319         struct winbindd_domain *domain;
 320         struct winbindd_request *request;
 321         struct winbindd_response *response;
 322         void (*continuation)(void *private_data_data, bool success);
 323         void *private_data_data;
 324 };
 325
 326 static void domain_init_recv(void *private_data_data, bool success);
 327
 328 void async_domain_request(TALLOC_CTX *mem_ctx,
 329                           struct winbindd_domain *domain,
 330                           struct winbindd_request *request,
 331                           struct winbindd_response *response,
 332                           void (*continuation)(void *private_data_data, bool success),
 333                           void *private_data_data)
 334 {
 335         struct domain_request_state *state;
 336
 337         if (domain->initialized) {
 338                 async_request(mem_ctx, &domain->child, request, response,
 339                               continuation, private_data_data);
 340                 return;
 341         }
 342
 343         state = TALLOC_P(mem_ctx, struct domain_request_state);
 344         if (state == NULL) {
 345                 DEBUG(0, ("talloc failed\n"));
 346                 continuation(private_data_data, False);
 347                 return;
 348         }
 349
 350         state->mem_ctx = mem_ctx;
 351         state->domain = domain;
 352         state->request = request;
 353         state->response = response;
 354         state->continuation = continuation;
 355         state->private_data_data = private_data_data;
 356
 357         init_child_connection(domain, domain_init_recv, state);
 358 }
 359
 360 static void domain_init_recv(void *private_data_data, bool success)
 361 {
 362         struct domain_request_state *state =
 363                 talloc_get_type_abort(private_data_data, struct domain_request_state);
 364
 365         if (!success) {
 366                 DEBUG(5, ("Domain init returned an error\n"));
 367                 state->continuation(state->private_data_data, False);
 368                 return;
 369         }
 370
 371         async_request(state->mem_ctx, &state->domain->child,
 372                       state->request, state->response,
 373                       state->continuation, state->private_data_data);
 374 }
 375
 376 static void recvfrom_child(void *private_data_data, bool success)
 377 {
 378         struct winbindd_cli_state *state =
 379                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 380         enum winbindd_result result = state->response.result;
 381
 382         /* This is an optimization: The child has written directly to the
 383          * response buffer. The request itself is still in pending state,
 384          * state that in the result code. */
 385
 386         state->response.result = WINBINDD_PENDING;
 387
 388         if ((!success) || (result != WINBINDD_OK)) {
 389                 request_error(state);
 390                 return;
 391         }
 392
 393         request_ok(state);
 394 }
 395
 396 void sendto_child(struct winbindd_cli_state *state,
 397                   struct winbindd_child *child)
 398 {
 399         async_request(state->mem_ctx, child, &state->request,
 400                       &state->response, recvfrom_child, state);
 401 }
 402
 403 void sendto_domain(struct winbindd_cli_state *state,
 404                    struct winbindd_domain *domain)
 405 {
 406         async_domain_request(state->mem_ctx, domain,
 407                              &state->request, &state->response,
 408                              recvfrom_child, state);
 409 }
 410
 411 const struct winbindd_child_dispatch_table domain_dispatch_table[] = {
 412
 413         { WINBINDD_LOOKUPSID,            winbindd_dual_lookupsid,             "LOOKUPSID" },
 414         { WINBINDD_LOOKUPNAME,           winbindd_dual_lookupname,            "LOOKUPNAME" },
 415         { WINBINDD_LOOKUPRIDS,           winbindd_dual_lookuprids,            "LOOKUPRIDS" },
 416         { WINBINDD_LIST_TRUSTDOM,        winbindd_dual_list_trusted_domains,  "LIST_TRUSTDOM" },
 417         { WINBINDD_INIT_CONNECTION,      winbindd_dual_init_connection,       "INIT_CONNECTION" },
 418         { WINBINDD_GETDCNAME,            winbindd_dual_getdcname,             "GETDCNAME" },
 419         { WINBINDD_SHOW_SEQUENCE,        winbindd_dual_show_sequence,         "SHOW_SEQUENCE" },
 420         { WINBINDD_PAM_AUTH,             winbindd_dual_pam_auth,              "PAM_AUTH" },
 421         { WINBINDD_PAM_AUTH_CRAP,        winbindd_dual_pam_auth_crap,         "AUTH_CRAP" },
 422         { WINBINDD_PAM_LOGOFF,           winbindd_dual_pam_logoff,            "PAM_LOGOFF" },
 423         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP,winbindd_dual_pam_chng_pswd_auth_crap,"CHNG_PSWD_AUTH_CRAP" },
 424         { WINBINDD_PAM_CHAUTHTOK,        winbindd_dual_pam_chauthtok,         "PAM_CHAUTHTOK" },
 425         { WINBINDD_CHECK_MACHACC,        winbindd_dual_check_machine_acct,    "CHECK_MACHACC" },
 426         { WINBINDD_DUAL_USERINFO,        winbindd_dual_userinfo,              "DUAL_USERINFO" },
 427         { WINBINDD_GETUSERDOMGROUPS,     winbindd_dual_getuserdomgroups,      "GETUSERDOMGROUPS" },
 428         { WINBINDD_DUAL_GETSIDALIASES,   winbindd_dual_getsidaliases,         "GETSIDALIASES" },
 429         { WINBINDD_CCACHE_NTLMAUTH,      winbindd_dual_ccache_ntlm_auth,      "CCACHE_NTLM_AUTH" },
 430         /* End of list */
 431
 432         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 433 };
 434
 435 static void child_process_request(struct winbindd_child *child,
 436                                   struct winbindd_cli_state *state)
 437 {
 438         struct winbindd_domain *domain = child->domain;
 439         const struct winbindd_child_dispatch_table *table = child->table;
 440
 441         /* Free response data - we may be interrupted and receive another
 442            command before being able to send this data off. */
 443
 444         state->response.result = WINBINDD_ERROR;
 445         state->response.length = sizeof(struct winbindd_response);
 446
 447         /* as all requests in the child are sync, we can use talloc_tos() */
 448         state->mem_ctx = talloc_tos();
 449
 450         /* Process command */
 451
 452         for (; table->fn; table++) {
 453                 if (state->request.cmd == table->cmd) {
 454                         DEBUG(10,("process_request: request fn %s\n",
 455                                   table->winbindd_cmd_name ));
 456                         state->response.result = table->fn(domain, state);
 457                         break;
 458                 }
 459         }
 460
 461         if (!table->fn) {
 462                 DEBUG(1 ,("child_process_request: unknown request fn number %d\n",
 463                           (int)state->request.cmd ));
 464                 state->response.result = WINBINDD_ERROR;
 465         }
 466 }
 467
 468 void setup_domain_child(struct winbindd_domain *domain,
 469                         struct winbindd_child *child,
 470                         const struct winbindd_child_dispatch_table *table,
 471                         const char *explicit_logfile)
 472 {
 473         if (explicit_logfile != NULL) {
 474                 if (asprintf(&child->logfilename, "%s/log.winbindd-%s",
 475                              dyn_LOGFILEBASE, explicit_logfile) < 0) {
 476                         smb_panic("Internal error: asprintf failed");
 477                 }
 478         } else if (domain != NULL) {
 479                 if (asprintf(&child->logfilename, "%s/log.wb-%s",
 480                              dyn_LOGFILEBASE, domain->name) < 0) {
 481                         smb_panic("Internal error: asprintf failed");
 482                 }
 483         } else {
 484                 smb_panic("Internal error: domain == NULL && "
 485                           "explicit_logfile == NULL");
 486         }
 487
 488         child->domain = domain;
 489         child->table = table;
 490 }
 491
 492 struct winbindd_child *children = NULL;
 493
 494 void winbind_child_died(pid_t pid)
 495 {
 496         struct winbindd_child *child;
 497
 498         for (child = children; child != NULL; child = child->next) {
 499                 if (child->pid == pid) {
 500                         break;
 501                 }
 502         }
 503
 504         if (child == NULL) {
 505                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 506                 return;
 507         }
 508
 509         remove_fd_event(&child->event);
 510         close(child->event.fd);
 511         child->event.fd = 0;
 512         child->event.flags = 0;
 513         child->pid = 0;
 514         SAFE_FREE(child->logfilename);
 515
 516         schedule_async_request(child);
 517 }
 518
 519 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 520
 521 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 522 {
 523         flush_negative_conn_cache_for_domain(domain->name);
 524         if (*domain->alt_name) {
 525                 flush_negative_conn_cache_for_domain(domain->alt_name);
 526         }
 527 }
 528
 529 /* Set our domains as offline and forward the offline message to our children. */
 530
 531 void winbind_msg_offline(struct messaging_context *msg_ctx,
 532                          void *private_data,
 533                          uint32_t msg_type,
 534                          struct server_id server_id,
 535                          DATA_BLOB *data)
 536 {
 537         struct winbindd_child *child;
 538         struct winbindd_domain *domain;
 539
 540         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 541
 542         if (!lp_winbind_offline_logon()) {
 543                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 544                 return;
 545         }
 546
 547         /* Set our global state as offline. */
 548         if (!set_global_winbindd_state_offline()) {
 549                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 550                 return;
 551         }
 552
 553         /* Set all our domains as offline. */
 554         for (domain = domain_list(); domain; domain = domain->next) {
 555                 if (domain->internal) {
 556                         continue;
 557                 }
 558                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 559                 set_domain_offline(domain);
 560         }
 561
 562         for (child = children; child != NULL; child = child->next) {
 563                 /* Don't send message to internal childs.  We've already
 564                    done so above. */
 565                 if (!child->domain || winbindd_internal_child(child)) {
 566                         continue;
 567                 }
 568
 569                 /* Or internal domains (this should not be possible....) */
 570                 if (child->domain->internal) {
 571                         continue;
 572                 }
 573
 574                 /* Each winbindd child should only process requests for one domain - make sure
 575                    we only set it online / offline for that domain. */
 576
 577                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 578                         (unsigned int)child->pid, domain->name ));
 579
 580                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 581                                    MSG_WINBIND_OFFLINE,
 582                                    (uint8 *)child->domain->name,
 583                                    strlen(child->domain->name)+1);
 584         }
 585 }
 586
 587 /* Set our domains as online and forward the online message to our children. */
 588
 589 void winbind_msg_online(struct messaging_context *msg_ctx,
 590                         void *private_data,
 591                         uint32_t msg_type,
 592                         struct server_id server_id,
 593                         DATA_BLOB *data)
 594 {
 595         struct winbindd_child *child;
 596         struct winbindd_domain *domain;
 597
 598         DEBUG(10,("winbind_msg_online: got online message.\n"));
 599
 600         if (!lp_winbind_offline_logon()) {
 601                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 602                 return;
 603         }
 604
 605         /* Set our global state as online. */
 606         set_global_winbindd_state_online();
 607
 608         smb_nscd_flush_user_cache();
 609         smb_nscd_flush_group_cache();
 610
 611         /* Set all our domains as online. */
 612         for (domain = domain_list(); domain; domain = domain->next) {
 613                 if (domain->internal) {
 614                         continue;
 615                 }
 616                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 617
 618                 winbindd_flush_negative_conn_cache(domain);
 619                 set_domain_online_request(domain);
 620
 621                 /* Send an online message to the idmap child when our
 622                    primary domain comes back online */
 623
 624                 if ( domain->primary ) {
 625                         struct winbindd_child *idmap = idmap_child();
 626
 627                         if ( idmap->pid != 0 ) {
 628                                 messaging_send_buf(msg_ctx,
 629                                                    pid_to_procid(idmap->pid),
 630                                                    MSG_WINBIND_ONLINE,
 631                                                    (uint8 *)domain->name,
 632                                                    strlen(domain->name)+1);
 633                         }
 634
 635                 }
 636         }
 637
 638         for (child = children; child != NULL; child = child->next) {
 639                 /* Don't send message to internal childs. */
 640                 if (!child->domain || winbindd_internal_child(child)) {
 641                         continue;
 642                 }
 643
 644                 /* Or internal domains (this should not be possible....) */
 645                 if (child->domain->internal) {
 646                         continue;
 647                 }
 648
 649                 /* Each winbindd child should only process requests for one domain - make sure
 650                    we only set it online / offline for that domain. */
 651
 652                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 653                         (unsigned int)child->pid, child->domain->name ));
 654
 655                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 656                                    MSG_WINBIND_ONLINE,
 657                                    (uint8 *)child->domain->name,
 658                                    strlen(child->domain->name)+1);
 659         }
 660 }
 661
 662 /* Forward the online/offline messages to our children. */
 663 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 664                               void *private_data,
 665                               uint32_t msg_type,
 666                               struct server_id server_id,
 667                               DATA_BLOB *data)
 668 {
 669         struct winbindd_child *child;
 670
 671         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 672
 673         for (child = children; child != NULL; child = child->next) {
 674                 if (child->domain && child->domain->primary) {
 675                         DEBUG(10,("winbind_msg_onlinestatus: "
 676                                   "sending message to pid %u of primary domain.\n",
 677                                   (unsigned int)child->pid));
 678                         messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 679                                            MSG_WINBIND_ONLINESTATUS,
 680                                            (uint8 *)data->data,
 681                                            data->length);
 682                         break;
 683                 }
 684         }
 685 }
 686
 687 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 688                                  void *private_data,
 689                                  uint32_t msg_type,
 690                                  struct server_id server_id,
 691                                  DATA_BLOB *data)
 692 {
 693         struct winbindd_child *child;
 694
 695         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 696
 697         dump_event_list(winbind_event_context());
 698
 699         for (child = children; child != NULL; child = child->next) {
 700
 701                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 702                         (unsigned int)child->pid));
 703
 704                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 705                                    MSG_DUMP_EVENT_LIST,
 706                                    NULL, 0);
 707         }
 708
 709 }
 710
 711 static void account_lockout_policy_handler(struct event_context *ctx,
 712                                            struct timed_event *te,
 713                                            const struct timeval *now,
 714                                            void *private_data)
 715 {
 716         struct winbindd_child *child =
 717                 (struct winbindd_child *)private_data;
 718         TALLOC_CTX *mem_ctx = NULL;
 719         struct winbindd_methods *methods;
 720         SAM_UNK_INFO_12 lockout_policy;
 721         NTSTATUS result;
 722
 723         DEBUG(10,("account_lockout_policy_handler called\n"));
 724
 725         TALLOC_FREE(child->lockout_policy_event);
 726
 727         if ( !winbindd_can_contact_domain( child->domain ) ) {
 728                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 729                           "do not have an incoming trust to domain %s\n",
 730                           child->domain->name));
 731
 732                 return;
 733         }
 734
 735         methods = child->domain->methods;
 736
 737         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 738         if (!mem_ctx) {
 739                 result = NT_STATUS_NO_MEMORY;
 740         } else {
 741                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 742         }
 743         TALLOC_FREE(mem_ctx);
 744
 745         if (!NT_STATUS_IS_OK(result)) {
 746                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 747                          nt_errstr(result)));
 748         }
 749
 750         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 751                                                       timeval_current_ofs(3600, 0),
 752                                                       "account_lockout_policy_handler",
 753                                                       account_lockout_policy_handler,
 754                                                       child);
 755 }
 756
 757 /* Deal with a request to go offline. */
 758
 759 static void child_msg_offline(struct messaging_context *msg,
 760                               void *private_data,
 761                               uint32_t msg_type,
 762                               struct server_id server_id,
 763                               DATA_BLOB *data)
 764 {
 765         struct winbindd_domain *domain;
 766         const char *domainname = (const char *)data->data;
 767
 768         if (data->data == NULL || data->length == 0) {
 769                 return;
 770         }
 771
 772         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 773
 774         if (!lp_winbind_offline_logon()) {
 775                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 776                 return;
 777         }
 778
 779         /* Mark the requested domain offline. */
 780
 781         for (domain = domain_list(); domain; domain = domain->next) {
 782                 if (domain->internal) {
 783                         continue;
 784                 }
 785                 if (strequal(domain->name, domainname)) {
 786                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 787                         set_domain_offline(domain);
 788                 }
 789         }
 790 }
 791
 792 /* Deal with a request to go online. */
 793
 794 static void child_msg_online(struct messaging_context *msg,
 795                              void *private_data,
 796                              uint32_t msg_type,
 797                              struct server_id server_id,
 798                              DATA_BLOB *data)
 799 {
 800         struct winbindd_domain *domain;
 801         const char *domainname = (const char *)data->data;
 802
 803         if (data->data == NULL || data->length == 0) {
 804                 return;
 805         }
 806
 807         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 808
 809         if (!lp_winbind_offline_logon()) {
 810                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 811                 return;
 812         }
 813
 814         /* Set our global state as online. */
 815         set_global_winbindd_state_online();
 816
 817         /* Try and mark everything online - delete any negative cache entries
 818            to force a reconnect now. */
 819
 820         for (domain = domain_list(); domain; domain = domain->next) {
 821                 if (domain->internal) {
 822                         continue;
 823                 }
 824                 if (strequal(domain->name, domainname)) {
 825                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 826                         winbindd_flush_negative_conn_cache(domain);
 827                         set_domain_online_request(domain);
 828                 }
 829         }
 830 }
 831
 832 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 833 {
 834         struct winbindd_domain *domain;
 835         char *buf = NULL;
 836
 837         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 838                                    get_global_winbindd_state_offline() ?
 839                                    "Offline":"Online")) == NULL) {
 840                 return NULL;
 841         }
 842
 843         for (domain = domain_list(); domain; domain = domain->next) {
 844                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 845                                                   domain->name,
 846                                                   domain->online ?
 847                                                   "Online":"Offline")) == NULL) {
 848                         return NULL;
 849                 }
 850         }
 851
 852         buf = talloc_asprintf_append_buffer(buf, "\n");
 853
 854         DEBUG(5,("collect_onlinestatus: %s", buf));
 855
 856         return buf;
 857 }
 858
 859 static void child_msg_onlinestatus(struct messaging_context *msg_ctx,
 860                                    void *private_data,
 861                                    uint32_t msg_type,
 862                                    struct server_id server_id,
 863                                    DATA_BLOB *data)
 864 {
 865         TALLOC_CTX *mem_ctx;
 866         const char *message;
 867         struct server_id *sender;
 868
 869         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 870
 871         if (!data->data) {
 872                 return;
 873         }
 874
 875         sender = (struct server_id *)data->data;
 876
 877         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 878         if (mem_ctx == NULL) {
 879                 return;
 880         }
 881
 882         message = collect_onlinestatus(mem_ctx);
 883         if (message == NULL) {
 884                 talloc_destroy(mem_ctx);
 885                 return;
 886         }
 887
 888         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 889                            (uint8 *)message, strlen(message) + 1);
 890
 891         talloc_destroy(mem_ctx);
 892 }
 893
 894 static void child_msg_dump_event_list(struct messaging_context *msg,
 895                                       void *private_data,
 896                                       uint32_t msg_type,
 897                                       struct server_id server_id,
 898                                       DATA_BLOB *data)
 899 {
 900         DEBUG(5,("child_msg_dump_event_list received\n"));
 901
 902         dump_event_list(winbind_event_context());
 903 }
 904
 905
 906 static bool fork_domain_child(struct winbindd_child *child)
 907 {
 908         int fdpair[2];
 909         struct winbindd_cli_state state;
 910         struct winbindd_domain *domain;
 911
 912         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 913                 DEBUG(0, ("Could not open child pipe: %s\n",
 914                           strerror(errno)));
 915                 return False;
 916         }
 917
 918         ZERO_STRUCT(state);
 919         state.pid = sys_getpid();
 920
 921         /* Stop zombies */
 922         CatchChild();
 923
 924         child->pid = sys_fork();
 925
 926         if (child->pid == -1) {
 927                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 928                 return False;
 929         }
 930
 931         if (child->pid != 0) {
 932                 /* Parent */
 933                 close(fdpair[0]);
 934                 child->next = child->prev = NULL;
 935                 DLIST_ADD(children, child);
 936                 child->event.fd = fdpair[1];
 937                 child->event.flags = 0;
 938                 child->requests = NULL;
 939                 add_fd_event(&child->event);
 940                 return True;
 941         }
 942
 943         /* Child */
 944
 945         state.sock = fdpair[0];
 946         close(fdpair[1]);
 947
 948         /* tdb needs special fork handling */
 949         if (tdb_reopen_all(1) == -1) {
 950                 DEBUG(0,("tdb_reopen_all failed.\n"));
 951                 _exit(0);
 952         }
 953
 954         close_conns_after_fork();
 955
 956         if (!override_logfile) {
 957                 lp_set_logfile(child->logfilename);
 958                 reopen_logs();
 959         }
 960
 961         /*
 962          * For clustering, we need to re-init our ctdbd connection after the
 963          * fork
 964          */
 965         if (!NT_STATUS_IS_OK(messaging_reinit(winbind_messaging_context())))
 966                 exit(1);
 967
 968         /* Don't handle the same messages as our parent. */
 969         messaging_deregister(winbind_messaging_context(),
 970                              MSG_SMB_CONF_UPDATED, NULL);
 971         messaging_deregister(winbind_messaging_context(),
 972                              MSG_SHUTDOWN, NULL);
 973         messaging_deregister(winbind_messaging_context(),
 974                              MSG_WINBIND_OFFLINE, NULL);
 975         messaging_deregister(winbind_messaging_context(),
 976                              MSG_WINBIND_ONLINE, NULL);
 977         messaging_deregister(winbind_messaging_context(),
 978                              MSG_WINBIND_ONLINESTATUS, NULL);
 979         messaging_deregister(winbind_messaging_context(),
 980                              MSG_DUMP_EVENT_LIST, NULL);
 981
 982         /* Handle online/offline messages. */
 983         messaging_register(winbind_messaging_context(), NULL,
 984                            MSG_WINBIND_OFFLINE, child_msg_offline);
 985         messaging_register(winbind_messaging_context(), NULL,
 986                            MSG_WINBIND_ONLINE, child_msg_online);
 987         messaging_register(winbind_messaging_context(), NULL,
 988                            MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus);
 989         messaging_register(winbind_messaging_context(), NULL,
 990                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
 991
 992         if ( child->domain ) {
 993                 child->domain->startup = True;
 994                 child->domain->startup_time = time(NULL);
 995         }
 996
 997         /* Ensure we have no pending check_online events other
 998            than one for this domain. */
 999
1000         for (domain = domain_list(); domain; domain = domain->next) {
1001                 if (domain != child->domain) {
1002                         TALLOC_FREE(domain->check_online_event);
1003                 }
1004         }
1005
1006         /* Ensure we're not handling an event inherited from
1007            our parent. */
1008
1009         cancel_named_event(winbind_event_context(),
1010                            "krb5_ticket_refresh_handler");
1011
1012         /* We might be in the idmap child...*/
1013         if (child->domain && !(child->domain->internal) &&
1014             lp_winbind_offline_logon()) {
1015
1016                 set_domain_online_request(child->domain);
1017
1018                 child->lockout_policy_event = event_add_timed(
1019                         winbind_event_context(), NULL, timeval_zero(),
1020                         "account_lockout_policy_handler",
1021                         account_lockout_policy_handler,
1022                         child);
1023         }
1024
1025         while (1) {
1026
1027                 int ret;
1028                 fd_set read_fds;
1029                 struct timeval t;
1030                 struct timeval *tp;
1031                 struct timeval now;
1032                 TALLOC_CTX *frame = talloc_stackframe();
1033
1034                 run_events(winbind_event_context(), 0, NULL, NULL);
1035
1036                 GetTimeOfDay(&now);
1037
1038                 if (child->domain && child->domain->startup &&
1039                                 (now.tv_sec > child->domain->startup_time + 30)) {
1040                         /* No longer in "startup" mode. */
1041                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1042                                 child->domain->name ));
1043                         child->domain->startup = False;
1044                 }
1045
1046                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1047                 if (tp) {
1048                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1049                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1050                 }
1051
1052                 /* Handle messages */
1053
1054                 message_dispatch(winbind_messaging_context());
1055
1056                 FD_ZERO(&read_fds);
1057                 FD_SET(state.sock, &read_fds);
1058
1059                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
1060
1061                 if (ret == 0) {
1062                         DEBUG(11,("nothing is ready yet, continue\n"));
1063                         TALLOC_FREE(frame);
1064                         continue;
1065                 }
1066
1067                 if (ret == -1 && errno == EINTR) {
1068                         /* We got a signal - continue. */
1069                         TALLOC_FREE(frame);
1070                         continue;
1071                 }
1072
1073                 if (ret == -1 && errno != EINTR) {
1074                         DEBUG(0,("select error occured\n"));
1075                         TALLOC_FREE(frame);
1076                         perror("select");
1077                         return False;
1078                 }
1079
1080                 /* fetch a request from the main daemon */
1081                 child_read_request(&state);
1082
1083                 if (state.finished) {
1084                         /* we lost contact with our parent */
1085                         exit(0);
1086                 }
1087
1088                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
1089
1090                 ZERO_STRUCT(state.response);
1091                 state.request.null_term = '\0';
1092                 child_process_request(child, &state);
1093
1094                 SAFE_FREE(state.request.extra_data.data);
1095
1096                 cache_store_response(sys_getpid(), &state.response);
1097
1098                 SAFE_FREE(state.response.extra_data.data);
1099
1100                 /* We just send the result code back, the result
1101                  * structure needs to be fetched via the
1102                  * winbindd_cache. Hmm. That needs fixing... */
1103
1104                 if (write_data(state.sock,
1105                                (const char *)&state.response.result,
1106                                sizeof(state.response.result)) !=
1107                     sizeof(state.response.result)) {
1108                         DEBUG(0, ("Could not write result\n"));
1109                         exit(1);
1110                 }
1111                 TALLOC_FREE(frame);
1112         }
1113 }