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
  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));
  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);
  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                 pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
 475                              dyn_LOGFILEBASE, explicit_logfile);
 476         } else if (domain != NULL) {
 477                 pstr_sprintf(child->logfilename, "%s/log.wb-%s",
 478                              dyn_LOGFILEBASE, domain->name);
 479         } else {
 480                 smb_panic("Internal error: domain == NULL && "
 481                           "explicit_logfile == NULL");
 482         }
 483
 484         child->domain = domain;
 485         child->table = table;
 486 }
 487
 488 struct winbindd_child *children = NULL;
 489
 490 void winbind_child_died(pid_t pid)
 491 {
 492         struct winbindd_child *child;
 493
 494         for (child = children; child != NULL; child = child->next) {
 495                 if (child->pid == pid) {
 496                         break;
 497                 }
 498         }
 499
 500         if (child == NULL) {
 501                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 502                 return;
 503         }
 504
 505         remove_fd_event(&child->event);
 506         close(child->event.fd);
 507         child->event.fd = 0;
 508         child->event.flags = 0;
 509         child->pid = 0;
 510
 511         schedule_async_request(child);
 512 }
 513
 514 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 515
 516 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 517 {
 518         flush_negative_conn_cache_for_domain(domain->name);
 519         if (*domain->alt_name) {
 520                 flush_negative_conn_cache_for_domain(domain->alt_name);
 521         }
 522 }
 523
 524 /* Set our domains as offline and forward the offline message to our children. */
 525
 526 void winbind_msg_offline(struct messaging_context *msg_ctx,
 527                          void *private_data,
 528                          uint32_t msg_type,
 529                          struct server_id server_id,
 530                          DATA_BLOB *data)
 531 {
 532         struct winbindd_child *child;
 533         struct winbindd_domain *domain;
 534
 535         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 536
 537         if (!lp_winbind_offline_logon()) {
 538                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 539                 return;
 540         }
 541
 542         /* Set our global state as offline. */
 543         if (!set_global_winbindd_state_offline()) {
 544                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 545                 return;
 546         }
 547
 548         /* Set all our domains as offline. */
 549         for (domain = domain_list(); domain; domain = domain->next) {
 550                 if (domain->internal) {
 551                         continue;
 552                 }
 553                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 554                 set_domain_offline(domain);
 555         }
 556
 557         for (child = children; child != NULL; child = child->next) {
 558                 /* Don't send message to internal childs.  We've already
 559                    done so above. */
 560                 if (!child->domain || winbindd_internal_child(child)) {
 561                         continue;
 562                 }
 563
 564                 /* Or internal domains (this should not be possible....) */
 565                 if (child->domain->internal) {
 566                         continue;
 567                 }
 568
 569                 /* Each winbindd child should only process requests for one domain - make sure
 570                    we only set it online / offline for that domain. */
 571
 572                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 573                         (unsigned int)child->pid, domain->name ));
 574
 575                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 576                                    MSG_WINBIND_OFFLINE,
 577                                    (uint8 *)child->domain->name,
 578                                    strlen(child->domain->name)+1);
 579         }
 580 }
 581
 582 /* Set our domains as online and forward the online message to our children. */
 583
 584 void winbind_msg_online(struct messaging_context *msg_ctx,
 585                         void *private_data,
 586                         uint32_t msg_type,
 587                         struct server_id server_id,
 588                         DATA_BLOB *data)
 589 {
 590         struct winbindd_child *child;
 591         struct winbindd_domain *domain;
 592
 593         DEBUG(10,("winbind_msg_online: got online message.\n"));
 594
 595         if (!lp_winbind_offline_logon()) {
 596                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 597                 return;
 598         }
 599
 600         /* Set our global state as online. */
 601         set_global_winbindd_state_online();
 602
 603         smb_nscd_flush_user_cache();
 604         smb_nscd_flush_group_cache();
 605
 606         /* Set all our domains as online. */
 607         for (domain = domain_list(); domain; domain = domain->next) {
 608                 if (domain->internal) {
 609                         continue;
 610                 }
 611                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 612
 613                 winbindd_flush_negative_conn_cache(domain);
 614                 set_domain_online_request(domain);
 615
 616                 /* Send an online message to the idmap child when our
 617                    primary domain comes back online */
 618
 619                 if ( domain->primary ) {
 620                         struct winbindd_child *idmap = idmap_child();
 621
 622                         if ( idmap->pid != 0 ) {
 623                                 messaging_send_buf(msg_ctx,
 624                                                    pid_to_procid(idmap->pid),
 625                                                    MSG_WINBIND_ONLINE,
 626                                                    (uint8 *)domain->name,
 627                                                    strlen(domain->name)+1);
 628                         }
 629
 630                 }
 631         }
 632
 633         for (child = children; child != NULL; child = child->next) {
 634                 /* Don't send message to internal childs. */
 635                 if (!child->domain || winbindd_internal_child(child)) {
 636                         continue;
 637                 }
 638
 639                 /* Or internal domains (this should not be possible....) */
 640                 if (child->domain->internal) {
 641                         continue;
 642                 }
 643
 644                 /* Each winbindd child should only process requests for one domain - make sure
 645                    we only set it online / offline for that domain. */
 646
 647                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 648                         (unsigned int)child->pid, child->domain->name ));
 649
 650                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 651                                    MSG_WINBIND_ONLINE,
 652                                    (uint8 *)child->domain->name,
 653                                    strlen(child->domain->name)+1);
 654         }
 655 }
 656
 657 /* Forward the online/offline messages to our children. */
 658 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 659                               void *private_data,
 660                               uint32_t msg_type,
 661                               struct server_id server_id,
 662                               DATA_BLOB *data)
 663 {
 664         struct winbindd_child *child;
 665
 666         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 667
 668         for (child = children; child != NULL; child = child->next) {
 669                 if (child->domain && child->domain->primary) {
 670                         DEBUG(10,("winbind_msg_onlinestatus: "
 671                                   "sending message to pid %u of primary domain.\n",
 672                                   (unsigned int)child->pid));
 673                         messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 674                                            MSG_WINBIND_ONLINESTATUS,
 675                                            (uint8 *)data->data,
 676                                            data->length);
 677                         break;
 678                 }
 679         }
 680 }
 681
 682 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 683                                  void *private_data,
 684                                  uint32_t msg_type,
 685                                  struct server_id server_id,
 686                                  DATA_BLOB *data)
 687 {
 688         struct winbindd_child *child;
 689
 690         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 691
 692         dump_event_list(winbind_event_context());
 693
 694         for (child = children; child != NULL; child = child->next) {
 695
 696                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 697                         (unsigned int)child->pid));
 698
 699                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 700                                    MSG_DUMP_EVENT_LIST,
 701                                    NULL, 0);
 702         }
 703
 704 }
 705
 706 static void account_lockout_policy_handler(struct event_context *ctx,
 707                                            struct timed_event *te,
 708                                            const struct timeval *now,
 709                                            void *private_data)
 710 {
 711         struct winbindd_child *child =
 712                 (struct winbindd_child *)private_data;
 713         TALLOC_CTX *mem_ctx = NULL;
 714         struct winbindd_methods *methods;
 715         SAM_UNK_INFO_12 lockout_policy;
 716         NTSTATUS result;
 717
 718         DEBUG(10,("account_lockout_policy_handler called\n"));
 719
 720         TALLOC_FREE(child->lockout_policy_event);
 721
 722         if ( !winbindd_can_contact_domain( child->domain ) ) {
 723                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 724                           "do not have an incoming trust to domain %s\n",
 725                           child->domain->name));
 726
 727                 return;
 728         }
 729
 730         methods = child->domain->methods;
 731
 732         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 733         if (!mem_ctx) {
 734                 result = NT_STATUS_NO_MEMORY;
 735         } else {
 736                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 737         }
 738         TALLOC_FREE(mem_ctx);
 739
 740         if (!NT_STATUS_IS_OK(result)) {
 741                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 742                          nt_errstr(result)));
 743         }
 744
 745         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 746                                                       timeval_current_ofs(3600, 0),
 747                                                       "account_lockout_policy_handler",
 748                                                       account_lockout_policy_handler,
 749                                                       child);
 750 }
 751
 752 /* Deal with a request to go offline. */
 753
 754 static void child_msg_offline(struct messaging_context *msg,
 755                               void *private_data,
 756                               uint32_t msg_type,
 757                               struct server_id server_id,
 758                               DATA_BLOB *data)
 759 {
 760         struct winbindd_domain *domain;
 761         const char *domainname = (const char *)data->data;
 762
 763         if (data->data == NULL || data->length == 0) {
 764                 return;
 765         }
 766
 767         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 768
 769         if (!lp_winbind_offline_logon()) {
 770                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 771                 return;
 772         }
 773
 774         /* Mark the requested domain offline. */
 775
 776         for (domain = domain_list(); domain; domain = domain->next) {
 777                 if (domain->internal) {
 778                         continue;
 779                 }
 780                 if (strequal(domain->name, domainname)) {
 781                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 782                         set_domain_offline(domain);
 783                 }
 784         }
 785 }
 786
 787 /* Deal with a request to go online. */
 788
 789 static void child_msg_online(struct messaging_context *msg,
 790                              void *private_data,
 791                              uint32_t msg_type,
 792                              struct server_id server_id,
 793                              DATA_BLOB *data)
 794 {
 795         struct winbindd_domain *domain;
 796         const char *domainname = (const char *)data->data;
 797
 798         if (data->data == NULL || data->length == 0) {
 799                 return;
 800         }
 801
 802         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 803
 804         if (!lp_winbind_offline_logon()) {
 805                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 806                 return;
 807         }
 808
 809         /* Set our global state as online. */
 810         set_global_winbindd_state_online();
 811
 812         /* Try and mark everything online - delete any negative cache entries
 813            to force a reconnect now. */
 814
 815         for (domain = domain_list(); domain; domain = domain->next) {
 816                 if (domain->internal) {
 817                         continue;
 818                 }
 819                 if (strequal(domain->name, domainname)) {
 820                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 821                         winbindd_flush_negative_conn_cache(domain);
 822                         set_domain_online_request(domain);
 823                 }
 824         }
 825 }
 826
 827 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 828 {
 829         struct winbindd_domain *domain;
 830         char *buf = NULL;
 831
 832         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 833                                    get_global_winbindd_state_offline() ?
 834                                    "Offline":"Online")) == NULL) {
 835                 return NULL;
 836         }
 837
 838         for (domain = domain_list(); domain; domain = domain->next) {
 839                 if ((buf = talloc_asprintf_append_buffer(buf, "%s:%s ",
 840                                                   domain->name,
 841                                                   domain->online ?
 842                                                   "Online":"Offline")) == NULL) {
 843                         return NULL;
 844                 }
 845         }
 846
 847         buf = talloc_asprintf_append_buffer(buf, "\n");
 848
 849         DEBUG(5,("collect_onlinestatus: %s", buf));
 850
 851         return buf;
 852 }
 853
 854 static void child_msg_onlinestatus(struct messaging_context *msg_ctx,
 855                                    void *private_data,
 856                                    uint32_t msg_type,
 857                                    struct server_id server_id,
 858                                    DATA_BLOB *data)
 859 {
 860         TALLOC_CTX *mem_ctx;
 861         const char *message;
 862         struct server_id *sender;
 863
 864         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 865
 866         if (!data->data) {
 867                 return;
 868         }
 869
 870         sender = (struct server_id *)data->data;
 871
 872         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 873         if (mem_ctx == NULL) {
 874                 return;
 875         }
 876
 877         message = collect_onlinestatus(mem_ctx);
 878         if (message == NULL) {
 879                 talloc_destroy(mem_ctx);
 880                 return;
 881         }
 882
 883         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 884                            (uint8 *)message, strlen(message) + 1);
 885
 886         talloc_destroy(mem_ctx);
 887 }
 888
 889 static void child_msg_dump_event_list(struct messaging_context *msg,
 890                                       void *private_data,
 891                                       uint32_t msg_type,
 892                                       struct server_id server_id,
 893                                       DATA_BLOB *data)
 894 {
 895         DEBUG(5,("child_msg_dump_event_list received\n"));
 896
 897         dump_event_list(winbind_event_context());
 898 }
 899
 900
 901 static BOOL fork_domain_child(struct winbindd_child *child)
 902 {
 903         int fdpair[2];
 904         struct winbindd_cli_state state;
 905         struct winbindd_domain *domain;
 906
 907         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 908                 DEBUG(0, ("Could not open child pipe: %s\n",
 909                           strerror(errno)));
 910                 return False;
 911         }
 912
 913         ZERO_STRUCT(state);
 914         state.pid = sys_getpid();
 915
 916         /* Stop zombies */
 917         CatchChild();
 918
 919         child->pid = sys_fork();
 920
 921         if (child->pid == -1) {
 922                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 923                 return False;
 924         }
 925
 926         if (child->pid != 0) {
 927                 /* Parent */
 928                 close(fdpair[0]);
 929                 child->next = child->prev = NULL;
 930                 DLIST_ADD(children, child);
 931                 child->event.fd = fdpair[1];
 932                 child->event.flags = 0;
 933                 child->requests = NULL;
 934                 add_fd_event(&child->event);
 935                 return True;
 936         }
 937
 938         /* Child */
 939
 940         state.sock = fdpair[0];
 941         close(fdpair[1]);
 942
 943         /* tdb needs special fork handling */
 944         if (tdb_reopen_all(1) == -1) {
 945                 DEBUG(0,("tdb_reopen_all failed.\n"));
 946                 _exit(0);
 947         }
 948
 949         close_conns_after_fork();
 950
 951         if (!override_logfile) {
 952                 lp_set_logfile(child->logfilename);
 953                 reopen_logs();
 954         }
 955
 956         /*
 957          * For clustering, we need to re-init our ctdbd connection after the
 958          * fork
 959          */
 960         if (!NT_STATUS_IS_OK(messaging_reinit(winbind_messaging_context())))
 961                 exit(1);
 962
 963         /* Don't handle the same messages as our parent. */
 964         messaging_deregister(winbind_messaging_context(),
 965                              MSG_SMB_CONF_UPDATED, NULL);
 966         messaging_deregister(winbind_messaging_context(),
 967                              MSG_SHUTDOWN, NULL);
 968         messaging_deregister(winbind_messaging_context(),
 969                              MSG_WINBIND_OFFLINE, NULL);
 970         messaging_deregister(winbind_messaging_context(),
 971                              MSG_WINBIND_ONLINE, NULL);
 972         messaging_deregister(winbind_messaging_context(),
 973                              MSG_WINBIND_ONLINESTATUS, NULL);
 974         messaging_deregister(winbind_messaging_context(),
 975                              MSG_DUMP_EVENT_LIST, NULL);
 976
 977         /* Handle online/offline messages. */
 978         messaging_register(winbind_messaging_context(), NULL,
 979                            MSG_WINBIND_OFFLINE, child_msg_offline);
 980         messaging_register(winbind_messaging_context(), NULL,
 981                            MSG_WINBIND_ONLINE, child_msg_online);
 982         messaging_register(winbind_messaging_context(), NULL,
 983                            MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus);
 984         messaging_register(winbind_messaging_context(), NULL,
 985                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
 986
 987         if ( child->domain ) {
 988                 child->domain->startup = True;
 989                 child->domain->startup_time = time(NULL);
 990         }
 991
 992         /* Ensure we have no pending check_online events other
 993            than one for this domain. */
 994
 995         for (domain = domain_list(); domain; domain = domain->next) {
 996                 if (domain != child->domain) {
 997                         TALLOC_FREE(domain->check_online_event);
 998                 }
 999         }
1000
1001         /* Ensure we're not handling an event inherited from
1002            our parent. */
1003
1004         cancel_named_event(winbind_event_context(),
1005                            "krb5_ticket_refresh_handler");
1006
1007         /* We might be in the idmap child...*/
1008         if (child->domain && !(child->domain->internal) &&
1009             lp_winbind_offline_logon()) {
1010
1011                 set_domain_online_request(child->domain);
1012
1013                 child->lockout_policy_event = event_add_timed(
1014                         winbind_event_context(), NULL, timeval_zero(),
1015                         "account_lockout_policy_handler",
1016                         account_lockout_policy_handler,
1017                         child);
1018         }
1019
1020         while (1) {
1021
1022                 int ret;
1023                 fd_set read_fds;
1024                 struct timeval t;
1025                 struct timeval *tp;
1026                 struct timeval now;
1027                 TALLOC_CTX *frame = talloc_stackframe();
1028
1029                 run_events(winbind_event_context(), 0, NULL, NULL);
1030
1031                 GetTimeOfDay(&now);
1032
1033                 if (child->domain && child->domain->startup &&
1034                                 (now.tv_sec > child->domain->startup_time + 30)) {
1035                         /* No longer in "startup" mode. */
1036                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1037                                 child->domain->name ));
1038                         child->domain->startup = False;
1039                 }
1040
1041                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1042                 if (tp) {
1043                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1044                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1045                 }
1046
1047                 /* Handle messages */
1048
1049                 message_dispatch(winbind_messaging_context());
1050
1051                 FD_ZERO(&read_fds);
1052                 FD_SET(state.sock, &read_fds);
1053
1054                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
1055
1056                 if (ret == 0) {
1057                         DEBUG(11,("nothing is ready yet, continue\n"));
1058                         TALLOC_FREE(frame);
1059                         continue;
1060                 }
1061
1062                 if (ret == -1 && errno == EINTR) {
1063                         /* We got a signal - continue. */
1064                         TALLOC_FREE(frame);
1065                         continue;
1066                 }
1067
1068                 if (ret == -1 && errno != EINTR) {
1069                         DEBUG(0,("select error occured\n"));
1070                         TALLOC_FREE(frame);
1071                         perror("select");
1072                         return False;
1073                 }
1074
1075                 /* fetch a request from the main daemon */
1076                 child_read_request(&state);
1077
1078                 if (state.finished) {
1079                         /* we lost contact with our parent */
1080                         exit(0);
1081                 }
1082
1083                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
1084
1085                 ZERO_STRUCT(state.response);
1086                 state.request.null_term = '\0';
1087                 child_process_request(child, &state);
1088
1089                 SAFE_FREE(state.request.extra_data.data);
1090
1091                 cache_store_response(sys_getpid(), &state.response);
1092
1093                 SAFE_FREE(state.response.extra_data.data);
1094
1095                 /* We just send the result code back, the result
1096                  * structure needs to be fetched via the
1097                  * winbindd_cache. Hmm. That needs fixing... */
1098
1099                 if (write_data(state.sock,
1100                                (const char *)&state.response.result,
1101                                sizeof(state.response.result)) !=
1102                     sizeof(state.response.result)) {
1103                         DEBUG(0, ("Could not write result\n"));
1104                         exit(1);
1105                 }
1106                 TALLOC_FREE(frame);
1107         }
1108 }