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));
  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
 412 struct winbindd_child_dispatch_table {
 413         enum winbindd_cmd cmd;
 414         enum winbindd_result (*fn)(struct winbindd_domain *domain,
 415                                    struct winbindd_cli_state *state);
 416         const char *winbindd_cmd_name;
 417 };
 418
 419 static struct winbindd_child_dispatch_table child_dispatch_table[] = {
 420
 421         { WINBINDD_LOOKUPSID,            winbindd_dual_lookupsid,             "LOOKUPSID" },
 422         { WINBINDD_LOOKUPNAME,           winbindd_dual_lookupname,            "LOOKUPNAME" },
 423         { WINBINDD_LOOKUPRIDS,           winbindd_dual_lookuprids,            "LOOKUPRIDS" },
 424         { WINBINDD_LIST_TRUSTDOM,        winbindd_dual_list_trusted_domains,  "LIST_TRUSTDOM" },
 425         { WINBINDD_INIT_CONNECTION,      winbindd_dual_init_connection,       "INIT_CONNECTION" },
 426         { WINBINDD_GETDCNAME,            winbindd_dual_getdcname,             "GETDCNAME" },
 427         { WINBINDD_DSGETDCNAME,          winbindd_dual_dsgetdcname,           "DSGETDCNAME" },
 428         { WINBINDD_SHOW_SEQUENCE,        winbindd_dual_show_sequence,         "SHOW_SEQUENCE" },
 429         { WINBINDD_PAM_AUTH,             winbindd_dual_pam_auth,              "PAM_AUTH" },
 430         { WINBINDD_PAM_AUTH_CRAP,        winbindd_dual_pam_auth_crap,         "AUTH_CRAP" },
 431         { WINBINDD_PAM_LOGOFF,           winbindd_dual_pam_logoff,            "PAM_LOGOFF" },
 432         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP,winbindd_dual_pam_chng_pswd_auth_crap,"CHNG_PSWD_AUTH_CRAP" },
 433         { WINBINDD_PAM_CHAUTHTOK,        winbindd_dual_pam_chauthtok,         "PAM_CHAUTHTOK" },
 434         { WINBINDD_CHECK_MACHACC,        winbindd_dual_check_machine_acct,    "CHECK_MACHACC" },
 435         { WINBINDD_DUAL_SID2UID,         winbindd_dual_sid2uid,               "DUAL_SID2UID" },
 436         { WINBINDD_DUAL_SID2GID,         winbindd_dual_sid2gid,               "DUAL_SID2GID" },
 437 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 438         { WINBINDD_DUAL_SIDS2XIDS,       winbindd_dual_sids2xids,             "DUAL_SIDS2XIDS" },
 439 #endif  /* end DISABLED */
 440         { WINBINDD_DUAL_UID2SID,         winbindd_dual_uid2sid,               "DUAL_UID2SID" },
 441         { WINBINDD_DUAL_GID2SID,         winbindd_dual_gid2sid,               "DUAL_GID2SID" },
 442         { WINBINDD_DUAL_UID2NAME,        winbindd_dual_uid2name,              "DUAL_UID2NAME" },
 443         { WINBINDD_DUAL_NAME2UID,        winbindd_dual_name2uid,              "DUAL_NAME2UID" },
 444         { WINBINDD_DUAL_GID2NAME,        winbindd_dual_gid2name,              "DUAL_GID2NAME" },
 445         { WINBINDD_DUAL_NAME2GID,        winbindd_dual_name2gid,              "DUAL_NAME2GID" },
 446         { WINBINDD_DUAL_SET_MAPPING,     winbindd_dual_set_mapping,           "DUAL_SET_MAPPING" },
 447         { WINBINDD_DUAL_SET_HWM,         winbindd_dual_set_hwm,               "DUAL_SET_HWMS" },
 448         { WINBINDD_DUAL_DUMP_MAPS,       winbindd_dual_dump_maps,             "DUAL_DUMP_MAPS" },
 449         { WINBINDD_DUAL_USERINFO,        winbindd_dual_userinfo,              "DUAL_USERINFO" },
 450         { WINBINDD_ALLOCATE_UID,         winbindd_dual_allocate_uid,          "ALLOCATE_UID" },
 451         { WINBINDD_ALLOCATE_GID,         winbindd_dual_allocate_gid,          "ALLOCATE_GID" },
 452         { WINBINDD_GETUSERDOMGROUPS,     winbindd_dual_getuserdomgroups,      "GETUSERDOMGROUPS" },
 453         { WINBINDD_DUAL_GETSIDALIASES,   winbindd_dual_getsidaliases,         "GETSIDALIASES" },
 454         { WINBINDD_CCACHE_NTLMAUTH,      winbindd_dual_ccache_ntlm_auth,      "CCACHE_NTLM_AUTH" },
 455         /* End of list */
 456
 457         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 458 };
 459
 460 static void child_process_request(struct winbindd_domain *domain,
 461                                   struct winbindd_cli_state *state)
 462 {
 463         struct winbindd_child_dispatch_table *table;
 464
 465         /* Free response data - we may be interrupted and receive another
 466            command before being able to send this data off. */
 467
 468         state->response.result = WINBINDD_ERROR;
 469         state->response.length = sizeof(struct winbindd_response);
 470
 471         /* as all requests in the child are sync, we can use talloc_tos() */
 472         state->mem_ctx = talloc_tos();
 473
 474         /* Process command */
 475
 476         for (table = child_dispatch_table; table->fn; table++) {
 477                 if (state->request.cmd == table->cmd) {
 478                         DEBUG(10,("process_request: request fn %s\n",
 479                                   table->winbindd_cmd_name ));
 480                         state->response.result = table->fn(domain, state);
 481                         break;
 482                 }
 483         }
 484
 485         if (!table->fn) {
 486                 DEBUG(10,("process_request: unknown request fn number %d\n",
 487                           (int)state->request.cmd ));
 488                 state->response.result = WINBINDD_ERROR;
 489         }
 490 }
 491
 492 void setup_domain_child(struct winbindd_domain *domain,
 493                         struct winbindd_child *child,
 494                         const char *explicit_logfile)
 495 {
 496         if (explicit_logfile != NULL) {
 497                 pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
 498                              dyn_LOGFILEBASE, explicit_logfile);
 499         } else if (domain != NULL) {
 500                 pstr_sprintf(child->logfilename, "%s/log.wb-%s",
 501                              dyn_LOGFILEBASE, domain->name);
 502         } else {
 503                 smb_panic("Internal error: domain == NULL && "
 504                           "explicit_logfile == NULL");
 505         }
 506
 507         child->domain = domain;
 508 }
 509
 510 struct winbindd_child *children = NULL;
 511
 512 void winbind_child_died(pid_t pid)
 513 {
 514         struct winbindd_child *child;
 515
 516         for (child = children; child != NULL; child = child->next) {
 517                 if (child->pid == pid) {
 518                         break;
 519                 }
 520         }
 521
 522         if (child == NULL) {
 523                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 524                 return;
 525         }
 526
 527         remove_fd_event(&child->event);
 528         close(child->event.fd);
 529         child->event.fd = 0;
 530         child->event.flags = 0;
 531         child->pid = 0;
 532
 533         schedule_async_request(child);
 534 }
 535
 536 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 537
 538 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 539 {
 540         flush_negative_conn_cache_for_domain(domain->name);
 541         if (*domain->alt_name) {
 542                 flush_negative_conn_cache_for_domain(domain->alt_name);
 543         }
 544 }
 545
 546 /* Set our domains as offline and forward the offline message to our children. */
 547
 548 void winbind_msg_offline(struct messaging_context *msg_ctx,
 549                          void *private_data,
 550                          uint32_t msg_type,
 551                          struct server_id server_id,
 552                          DATA_BLOB *data)
 553 {
 554         struct winbindd_child *child;
 555         struct winbindd_domain *domain;
 556
 557         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 558
 559         if (!lp_winbind_offline_logon()) {
 560                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 561                 return;
 562         }
 563
 564         /* Set our global state as offline. */
 565         if (!set_global_winbindd_state_offline()) {
 566                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 567                 return;
 568         }
 569
 570         /* Set all our domains as offline. */
 571         for (domain = domain_list(); domain; domain = domain->next) {
 572                 if (domain->internal) {
 573                         continue;
 574                 }
 575                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 576                 set_domain_offline(domain);
 577         }
 578
 579         for (child = children; child != NULL; child = child->next) {
 580                 /* Don't send message to internal childs.  We've already
 581                    done so above. */
 582                 if (!child->domain || winbindd_internal_child(child)) {
 583                         continue;
 584                 }
 585
 586                 /* Or internal domains (this should not be possible....) */
 587                 if (child->domain->internal) {
 588                         continue;
 589                 }
 590
 591                 /* Each winbindd child should only process requests for one domain - make sure
 592                    we only set it online / offline for that domain. */
 593
 594                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 595                         (unsigned int)child->pid, domain->name ));
 596
 597                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 598                                    MSG_WINBIND_OFFLINE,
 599                                    (uint8 *)child->domain->name,
 600                                    strlen(child->domain->name)+1);
 601         }
 602 }
 603
 604 /* Set our domains as online and forward the online message to our children. */
 605
 606 void winbind_msg_online(struct messaging_context *msg_ctx,
 607                         void *private_data,
 608                         uint32_t msg_type,
 609                         struct server_id server_id,
 610                         DATA_BLOB *data)
 611 {
 612         struct winbindd_child *child;
 613         struct winbindd_domain *domain;
 614
 615         DEBUG(10,("winbind_msg_online: got online message.\n"));
 616
 617         if (!lp_winbind_offline_logon()) {
 618                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 619                 return;
 620         }
 621
 622         /* Set our global state as online. */
 623         set_global_winbindd_state_online();
 624
 625         smb_nscd_flush_user_cache();
 626         smb_nscd_flush_group_cache();
 627
 628         /* Set all our domains as online. */
 629         for (domain = domain_list(); domain; domain = domain->next) {
 630                 if (domain->internal) {
 631                         continue;
 632                 }
 633                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 634
 635                 winbindd_flush_negative_conn_cache(domain);
 636                 set_domain_online_request(domain);
 637
 638                 /* Send an online message to the idmap child when our
 639                    primary domain comes back online */
 640
 641                 if ( domain->primary ) {
 642                         struct winbindd_child *idmap = idmap_child();
 643
 644                         if ( idmap->pid != 0 ) {
 645                                 messaging_send_buf(msg_ctx,
 646                                                    pid_to_procid(idmap->pid),
 647                                                    MSG_WINBIND_ONLINE,
 648                                                    (uint8 *)domain->name,
 649                                                    strlen(domain->name)+1);
 650                         }
 651
 652                 }
 653         }
 654
 655         for (child = children; child != NULL; child = child->next) {
 656                 /* Don't send message to internal childs. */
 657                 if (!child->domain || winbindd_internal_child(child)) {
 658                         continue;
 659                 }
 660
 661                 /* Or internal domains (this should not be possible....) */
 662                 if (child->domain->internal) {
 663                         continue;
 664                 }
 665
 666                 /* Each winbindd child should only process requests for one domain - make sure
 667                    we only set it online / offline for that domain. */
 668
 669                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 670                         (unsigned int)child->pid, child->domain->name ));
 671
 672                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 673                                    MSG_WINBIND_ONLINE,
 674                                    (uint8 *)child->domain->name,
 675                                    strlen(child->domain->name)+1);
 676         }
 677 }
 678
 679 /* Forward the online/offline messages to our children. */
 680 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 681                               void *private_data,
 682                               uint32_t msg_type,
 683                               struct server_id server_id,
 684                               DATA_BLOB *data)
 685 {
 686         struct winbindd_child *child;
 687
 688         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 689
 690         for (child = children; child != NULL; child = child->next) {
 691                 if (child->domain && child->domain->primary) {
 692                         DEBUG(10,("winbind_msg_onlinestatus: "
 693                                   "sending message to pid %u of primary domain.\n",
 694                                   (unsigned int)child->pid));
 695                         messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 696                                            MSG_WINBIND_ONLINESTATUS,
 697                                            (uint8 *)data->data,
 698                                            data->length);
 699                         break;
 700                 }
 701         }
 702 }
 703
 704 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 705                                  void *private_data,
 706                                  uint32_t msg_type,
 707                                  struct server_id server_id,
 708                                  DATA_BLOB *data)
 709 {
 710         struct winbindd_child *child;
 711
 712         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 713
 714         dump_event_list(winbind_event_context());
 715
 716         for (child = children; child != NULL; child = child->next) {
 717
 718                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 719                         (unsigned int)child->pid));
 720
 721                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 722                                    MSG_DUMP_EVENT_LIST,
 723                                    NULL, 0);
 724         }
 725
 726 }
 727
 728 static void account_lockout_policy_handler(struct event_context *ctx,
 729                                            struct timed_event *te,
 730                                            const struct timeval *now,
 731                                            void *private_data)
 732 {
 733         struct winbindd_child *child =
 734                 (struct winbindd_child *)private_data;
 735         TALLOC_CTX *mem_ctx = NULL;
 736         struct winbindd_methods *methods;
 737         SAM_UNK_INFO_12 lockout_policy;
 738         NTSTATUS result;
 739
 740         DEBUG(10,("account_lockout_policy_handler called\n"));
 741
 742         TALLOC_FREE(child->lockout_policy_event);
 743
 744         if ( !winbindd_can_contact_domain( child->domain ) ) {
 745                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 746                           "do not have an incoming trust to domain %s\n",
 747                           child->domain->name));
 748
 749                 return;
 750         }
 751
 752         methods = child->domain->methods;
 753
 754         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 755         if (!mem_ctx) {
 756                 result = NT_STATUS_NO_MEMORY;
 757         } else {
 758                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 759         }
 760         TALLOC_FREE(mem_ctx);
 761
 762         if (!NT_STATUS_IS_OK(result)) {
 763                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 764                          nt_errstr(result)));
 765         }
 766
 767         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 768                                                       timeval_current_ofs(3600, 0),
 769                                                       "account_lockout_policy_handler",
 770                                                       account_lockout_policy_handler,
 771                                                       child);
 772 }
 773
 774 /* Deal with a request to go offline. */
 775
 776 static void child_msg_offline(struct messaging_context *msg,
 777                               void *private_data,
 778                               uint32_t msg_type,
 779                               struct server_id server_id,
 780                               DATA_BLOB *data)
 781 {
 782         struct winbindd_domain *domain;
 783         const char *domainname = (const char *)data->data;
 784
 785         if (data->data == NULL || data->length == 0) {
 786                 return;
 787         }
 788
 789         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 790
 791         if (!lp_winbind_offline_logon()) {
 792                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 793                 return;
 794         }
 795
 796         /* Mark the requested domain offline. */
 797
 798         for (domain = domain_list(); domain; domain = domain->next) {
 799                 if (domain->internal) {
 800                         continue;
 801                 }
 802                 if (strequal(domain->name, domainname)) {
 803                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 804                         set_domain_offline(domain);
 805                 }
 806         }
 807 }
 808
 809 /* Deal with a request to go online. */
 810
 811 static void child_msg_online(struct messaging_context *msg,
 812                              void *private_data,
 813                              uint32_t msg_type,
 814                              struct server_id server_id,
 815                              DATA_BLOB *data)
 816 {
 817         struct winbindd_domain *domain;
 818         const char *domainname = (const char *)data->data;
 819
 820         if (data->data == NULL || data->length == 0) {
 821                 return;
 822         }
 823
 824         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 825
 826         if (!lp_winbind_offline_logon()) {
 827                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 828                 return;
 829         }
 830
 831         /* Set our global state as online. */
 832         set_global_winbindd_state_online();
 833
 834         /* Try and mark everything online - delete any negative cache entries
 835            to force a reconnect now. */
 836
 837         for (domain = domain_list(); domain; domain = domain->next) {
 838                 if (domain->internal) {
 839                         continue;
 840                 }
 841                 if (strequal(domain->name, domainname)) {
 842                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 843                         winbindd_flush_negative_conn_cache(domain);
 844                         set_domain_online_request(domain);
 845                 }
 846         }
 847 }
 848
 849 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 850 {
 851         struct winbindd_domain *domain;
 852         char *buf = NULL;
 853
 854         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 855                                    get_global_winbindd_state_offline() ?
 856                                    "Offline":"Online")) == NULL) {
 857                 return NULL;
 858         }
 859
 860         for (domain = domain_list(); domain; domain = domain->next) {
 861                 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
 862                                                   domain->name,
 863                                                   domain->online ?
 864                                                   "Online":"Offline")) == NULL) {
 865                         return NULL;
 866                 }
 867         }
 868
 869         buf = talloc_asprintf_append(buf, "\n");
 870
 871         DEBUG(5,("collect_onlinestatus: %s", buf));
 872
 873         return buf;
 874 }
 875
 876 static void child_msg_onlinestatus(struct messaging_context *msg_ctx,
 877                                    void *private_data,
 878                                    uint32_t msg_type,
 879                                    struct server_id server_id,
 880                                    DATA_BLOB *data)
 881 {
 882         TALLOC_CTX *mem_ctx;
 883         const char *message;
 884         struct server_id *sender;
 885
 886         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 887
 888         if (!data->data) {
 889                 return;
 890         }
 891
 892         sender = (struct server_id *)data->data;
 893
 894         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 895         if (mem_ctx == NULL) {
 896                 return;
 897         }
 898
 899         message = collect_onlinestatus(mem_ctx);
 900         if (message == NULL) {
 901                 talloc_destroy(mem_ctx);
 902                 return;
 903         }
 904
 905         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 906                            (uint8 *)message, strlen(message) + 1);
 907
 908         talloc_destroy(mem_ctx);
 909 }
 910
 911 static void child_msg_dump_event_list(struct messaging_context *msg,
 912                                       void *private_data,
 913                                       uint32_t msg_type,
 914                                       struct server_id server_id,
 915                                       DATA_BLOB *data)
 916 {
 917         DEBUG(5,("child_msg_dump_event_list received\n"));
 918
 919         dump_event_list(winbind_event_context());
 920 }
 921
 922
 923 static BOOL fork_domain_child(struct winbindd_child *child)
 924 {
 925         int fdpair[2];
 926         struct winbindd_cli_state state;
 927         struct winbindd_domain *domain;
 928
 929         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 930                 DEBUG(0, ("Could not open child pipe: %s\n",
 931                           strerror(errno)));
 932                 return False;
 933         }
 934
 935         ZERO_STRUCT(state);
 936         state.pid = sys_getpid();
 937
 938         /* Stop zombies */
 939         CatchChild();
 940
 941         child->pid = sys_fork();
 942
 943         if (child->pid == -1) {
 944                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 945                 return False;
 946         }
 947
 948         if (child->pid != 0) {
 949                 /* Parent */
 950                 close(fdpair[0]);
 951                 child->next = child->prev = NULL;
 952                 DLIST_ADD(children, child);
 953                 child->event.fd = fdpair[1];
 954                 child->event.flags = 0;
 955                 child->requests = NULL;
 956                 add_fd_event(&child->event);
 957                 return True;
 958         }
 959
 960         /* Child */
 961
 962         state.sock = fdpair[0];
 963         close(fdpair[1]);
 964
 965         /* tdb needs special fork handling */
 966         if (tdb_reopen_all(1) == -1) {
 967                 DEBUG(0,("tdb_reopen_all failed.\n"));
 968                 _exit(0);
 969         }
 970
 971         close_conns_after_fork();
 972
 973         if (!override_logfile) {
 974                 lp_set_logfile(child->logfilename);
 975                 reopen_logs();
 976         }
 977
 978         /*
 979          * For clustering, we need to re-init our ctdbd connection after the
 980          * fork
 981          */
 982         if (!NT_STATUS_IS_OK(messaging_reinit(winbind_messaging_context())))
 983                 exit(1);
 984
 985         /* Don't handle the same messages as our parent. */
 986         messaging_deregister(winbind_messaging_context(),
 987                              MSG_SMB_CONF_UPDATED, NULL);
 988         messaging_deregister(winbind_messaging_context(),
 989                              MSG_SHUTDOWN, NULL);
 990         messaging_deregister(winbind_messaging_context(),
 991                              MSG_WINBIND_OFFLINE, NULL);
 992         messaging_deregister(winbind_messaging_context(),
 993                              MSG_WINBIND_ONLINE, NULL);
 994         messaging_deregister(winbind_messaging_context(),
 995                              MSG_WINBIND_ONLINESTATUS, NULL);
 996         messaging_deregister(winbind_messaging_context(),
 997                              MSG_DUMP_EVENT_LIST, NULL);
 998
 999         /* Handle online/offline messages. */
1000         messaging_register(winbind_messaging_context(), NULL,
1001                            MSG_WINBIND_OFFLINE, child_msg_offline);
1002         messaging_register(winbind_messaging_context(), NULL,
1003                            MSG_WINBIND_ONLINE, child_msg_online);
1004         messaging_register(winbind_messaging_context(), NULL,
1005                            MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus);
1006         messaging_register(winbind_messaging_context(), NULL,
1007                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1008
1009         if ( child->domain ) {
1010                 child->domain->startup = True;
1011                 child->domain->startup_time = time(NULL);
1012         }
1013
1014         /* Ensure we have no pending check_online events other
1015            than one for this domain. */
1016
1017         for (domain = domain_list(); domain; domain = domain->next) {
1018                 if (domain != child->domain) {
1019                         TALLOC_FREE(domain->check_online_event);
1020                 }
1021         }
1022
1023         /* Ensure we're not handling an event inherited from
1024            our parent. */
1025
1026         cancel_named_event(winbind_event_context(),
1027                            "krb5_ticket_refresh_handler");
1028
1029         /* We might be in the idmap child...*/
1030         if (child->domain && !(child->domain->internal) &&
1031             lp_winbind_offline_logon()) {
1032
1033                 set_domain_online_request(child->domain);
1034
1035                 child->lockout_policy_event = event_add_timed(
1036                         winbind_event_context(), NULL, timeval_zero(),
1037                         "account_lockout_policy_handler",
1038                         account_lockout_policy_handler,
1039                         child);
1040         }
1041
1042         while (1) {
1043
1044                 int ret;
1045                 fd_set read_fds;
1046                 struct timeval t;
1047                 struct timeval *tp;
1048                 struct timeval now;
1049                 TALLOC_CTX *frame = talloc_stackframe();
1050
1051                 run_events(winbind_event_context(), 0, NULL, NULL);
1052
1053                 GetTimeOfDay(&now);
1054
1055                 if (child->domain && child->domain->startup &&
1056                                 (now.tv_sec > child->domain->startup_time + 30)) {
1057                         /* No longer in "startup" mode. */
1058                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1059                                 child->domain->name ));
1060                         child->domain->startup = False;
1061                 }
1062
1063                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1064                 if (tp) {
1065                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1066                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1067                 }
1068
1069                 /* Handle messages */
1070
1071                 message_dispatch(winbind_messaging_context());
1072
1073                 FD_ZERO(&read_fds);
1074                 FD_SET(state.sock, &read_fds);
1075
1076                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
1077
1078                 if (ret == 0) {
1079                         DEBUG(11,("nothing is ready yet, continue\n"));
1080                         TALLOC_FREE(frame);
1081                         continue;
1082                 }
1083
1084                 if (ret == -1 && errno == EINTR) {
1085                         /* We got a signal - continue. */
1086                         TALLOC_FREE(frame);
1087                         continue;
1088                 }
1089
1090                 if (ret == -1 && errno != EINTR) {
1091                         DEBUG(0,("select error occured\n"));
1092                         TALLOC_FREE(frame);
1093                         perror("select");
1094                         return False;
1095                 }
1096
1097                 /* fetch a request from the main daemon */
1098                 child_read_request(&state);
1099
1100                 if (state.finished) {
1101                         /* we lost contact with our parent */
1102                         exit(0);
1103                 }
1104
1105                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
1106
1107                 ZERO_STRUCT(state.response);
1108                 state.request.null_term = '\0';
1109                 child_process_request(child->domain, &state);
1110
1111                 SAFE_FREE(state.request.extra_data.data);
1112
1113                 cache_store_response(sys_getpid(), &state.response);
1114
1115                 SAFE_FREE(state.response.extra_data.data);
1116
1117                 /* We just send the result code back, the result
1118                  * structure needs to be fetched via the
1119                  * winbindd_cache. Hmm. That needs fixing... */
1120
1121                 if (write_data(state.sock,
1122                                (const char *)&state.response.result,
1123                                sizeof(state.response.result)) !=
1124                     sizeof(state.response.result)) {
1125                         DEBUG(0, ("Could not write result\n"));
1126                         exit(1);
1127                 }
1128                 TALLOC_FREE(frame);
1129         }
1130 }