source3/nsswitch/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 2 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, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 /*
  25  * We fork a child per domain to be able to act non-blocking in the main
  26  * winbind daemon. A domain controller thousands of miles away being being
  27  * slow replying with a 10.000 user list should not hold up netlogon calls
  28  * that can be handled locally.
  29  */
  30
  31 #include "includes.h"
  32 #include "winbindd.h"
  33
  34 #undef DBGC_CLASS
  35 #define DBGC_CLASS DBGC_WINBIND
  36
  37 extern BOOL override_logfile;
  38
  39 /* Read some data from a client connection */
  40
  41 static void child_read_request(struct winbindd_cli_state *state)
  42 {
  43         ssize_t len;
  44
  45         /* Read data */
  46
  47         len = read_data(state->sock, (char *)&state->request,
  48                         sizeof(state->request));
  49
  50         if (len != sizeof(state->request)) {
  51                 DEBUG(len > 0 ? 0 : 3, ("Got invalid request length: %d\n", (int)len));
  52                 state->finished = True;
  53                 return;
  54         }
  55
  56         if (state->request.extra_len == 0) {
  57                 state->request.extra_data.data = NULL;
  58                 return;
  59         }
  60
  61         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request.extra_len));
  62
  63         state->request.extra_data.data =
  64                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
  65
  66         if (state->request.extra_data.data == NULL) {
  67                 DEBUG(0, ("malloc failed\n"));
  68                 state->finished = True;
  69                 return;
  70         }
  71
  72         /* Ensure null termination */
  73         state->request.extra_data.data[state->request.extra_len] = '\0';
  74
  75         len = read_data(state->sock, state->request.extra_data.data,
  76                         state->request.extra_len);
  77
  78         if (len != state->request.extra_len) {
  79                 DEBUG(0, ("Could not read extra data\n"));
  80                 state->finished = True;
  81                 return;
  82         }
  83 }
  84
  85 /*
  86  * Machinery for async requests sent to children. You set up a
  87  * winbindd_request, select a child to query, and issue a async_request
  88  * call. When the request is completed, the callback function you specified is
  89  * called back with the private pointer you gave to async_request.
  90  */
  91
  92 struct winbindd_async_request {
  93         struct winbindd_async_request *next, *prev;
  94         TALLOC_CTX *mem_ctx;
  95         struct winbindd_child *child;
  96         struct winbindd_request *request;
  97         struct winbindd_response *response;
  98         void (*continuation)(void *private_data, BOOL success);
  99         struct timed_event *reply_timeout_event;
 100         void *private_data;
 101 };
 102
 103 static void async_main_request_sent(void *private_data, BOOL success);
 104 static void async_request_sent(void *private_data, BOOL success);
 105 static void async_reply_recv(void *private_data, BOOL success);
 106 static void schedule_async_request(struct winbindd_child *child);
 107
 108 void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
 109                    struct winbindd_request *request,
 110                    struct winbindd_response *response,
 111                    void (*continuation)(void *private_data, BOOL success),
 112                    void *private_data)
 113 {
 114         struct winbindd_async_request *state;
 115
 116         SMB_ASSERT(continuation != NULL);
 117
 118         state = TALLOC_P(mem_ctx, struct winbindd_async_request);
 119
 120         if (state == NULL) {
 121                 DEBUG(0, ("talloc failed\n"));
 122                 continuation(private_data, False);
 123                 return;
 124         }
 125
 126         state->mem_ctx = mem_ctx;
 127         state->child = child;
 128         state->request = request;
 129         state->response = response;
 130         state->continuation = continuation;
 131         state->private_data = private_data;
 132
 133         DLIST_ADD_END(child->requests, state, struct winbindd_async_request *);
 134
 135         schedule_async_request(child);
 136
 137         return;
 138 }
 139
 140 static void async_main_request_sent(void *private_data, BOOL success)
 141 {
 142         struct winbindd_async_request *state =
 143                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 144
 145         if (!success) {
 146                 DEBUG(5, ("Could not send async request\n"));
 147
 148                 state->response->length = sizeof(struct winbindd_response);
 149                 state->response->result = WINBINDD_ERROR;
 150                 state->continuation(state->private_data, False);
 151                 return;
 152         }
 153
 154         if (state->request->extra_len == 0) {
 155                 async_request_sent(private_data, True);
 156                 return;
 157         }
 158
 159         setup_async_write(&state->child->event, state->request->extra_data.data,
 160                           state->request->extra_len,
 161                           async_request_sent, state);
 162 }
 163
 164 /****************************************************************
 165  Handler triggered if the child winbindd doesn't respond within
 166  a given timeout.
 167 ****************************************************************/
 168
 169 static void async_request_timeout_handler(struct event_context *ctx,
 170                                         struct timed_event *te,
 171                                         const struct timeval *now,
 172                                         void *private_data)
 173 {
 174         struct winbindd_async_request *state =
 175                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 176
 177         /* Deal with the reply - set to error. */
 178
 179         async_reply_recv(private_data, False);
 180
 181         /*
 182          * Close the socket to the child. Should cause the
 183          * child to exit.
 184          */
 185
 186         DEBUG(0,("async_request_timeout_handler: child pid %u is not responding. "
 187                 "Closing connection to it.\n",
 188                 state->child->pid ));
 189
 190         winbind_child_died(state->child->pid);
 191 }
 192
 193 static void async_request_sent(void *private_data_data, BOOL success)
 194 {
 195         uint32_t timeout = 30;
 196         struct winbindd_async_request *state =
 197                 talloc_get_type_abort(private_data_data, struct winbindd_async_request);
 198
 199         if (!success) {
 200                 DEBUG(5, ("Could not send async request\n"));
 201
 202                 state->response->length = sizeof(struct winbindd_response);
 203                 state->response->result = WINBINDD_ERROR;
 204                 state->continuation(state->private_data, False);
 205                 return;
 206         }
 207
 208         /* Request successfully sent to the child, setup the wait for reply */
 209
 210         setup_async_read(&state->child->event,
 211                          &state->response->result,
 212                          sizeof(state->response->result),
 213                          async_reply_recv, state);
 214
 215         /*
 216          * Normal timeouts are 30s, but auth requests may take a long
 217          * time to timeout.
 218          */
 219
 220         if (state->request->cmd == WINBINDD_PAM_AUTH ||
 221                         state->request->cmd == WINBINDD_PAM_AUTH_CRAP ) {
 222
 223                 timeout = 300;
 224         }
 225
 226         /*
 227          * Set up a timeout of 1 minute for the response.
 228          * If we don't get it close the child socket and
 229          * report failure.
 230          */
 231
 232         state->reply_timeout_event = event_add_timed(winbind_event_context(),
 233                                                         NULL,
 234                                                         timeval_current_ofs(timeout,0),
 235                                                         "async_request_timeout",
 236                                                         async_request_timeout_handler,
 237                                                         state);
 238         if (!state->reply_timeout_event) {
 239                 smb_panic("async_request_sent: failed to add timeout handler.\n");
 240         }
 241 }
 242
 243 static void async_reply_recv(void *private_data, BOOL success)
 244 {
 245         struct winbindd_async_request *state =
 246                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 247         struct winbindd_child *child = state->child;
 248
 249         if (state->reply_timeout_event) {
 250                 TALLOC_FREE(state->reply_timeout_event);
 251         }
 252
 253         state->response->length = sizeof(struct winbindd_response);
 254
 255         if (!success) {
 256                 DEBUG(5, ("Could not receive async reply\n"));
 257
 258                 cache_cleanup_response(child->pid);
 259                 DLIST_REMOVE(child->requests, state);
 260
 261                 state->response->result = WINBINDD_ERROR;
 262                 state->continuation(state->private_data, False);
 263                 return;
 264         }
 265
 266         SMB_ASSERT(cache_retrieve_response(child->pid,
 267                                            state->response));
 268
 269         cache_cleanup_response(child->pid);
 270
 271         DLIST_REMOVE(child->requests, state);
 272
 273         schedule_async_request(child);
 274
 275         state->continuation(state->private_data, True);
 276 }
 277
 278 static BOOL fork_domain_child(struct winbindd_child *child);
 279
 280 static void schedule_async_request(struct winbindd_child *child)
 281 {
 282         struct winbindd_async_request *request = child->requests;
 283
 284         if (request == NULL) {
 285                 return;
 286         }
 287
 288         if (child->event.flags != 0) {
 289                 return;         /* Busy */
 290         }
 291
 292         if ((child->pid == 0) && (!fork_domain_child(child))) {
 293                 /* Cancel all outstanding requests */
 294
 295                 while (request != NULL) {
 296                         /* request might be free'd in the continuation */
 297                         struct winbindd_async_request *next = request->next;
 298                         request->continuation(request->private_data, False);
 299                         request = next;
 300                 }
 301                 return;
 302         }
 303
 304         setup_async_write(&child->event, request->request,
 305                           sizeof(*request->request),
 306                           async_main_request_sent, request);
 307
 308         return;
 309 }
 310
 311 struct domain_request_state {
 312         TALLOC_CTX *mem_ctx;
 313         struct winbindd_domain *domain;
 314         struct winbindd_request *request;
 315         struct winbindd_response *response;
 316         void (*continuation)(void *private_data_data, BOOL success);
 317         void *private_data_data;
 318 };
 319
 320 static void domain_init_recv(void *private_data_data, BOOL success);
 321
 322 void async_domain_request(TALLOC_CTX *mem_ctx,
 323                           struct winbindd_domain *domain,
 324                           struct winbindd_request *request,
 325                           struct winbindd_response *response,
 326                           void (*continuation)(void *private_data_data, BOOL success),
 327                           void *private_data_data)
 328 {
 329         struct domain_request_state *state;
 330
 331         if (domain->initialized) {
 332                 async_request(mem_ctx, &domain->child, request, response,
 333                               continuation, private_data_data);
 334                 return;
 335         }
 336
 337         state = TALLOC_P(mem_ctx, struct domain_request_state);
 338         if (state == NULL) {
 339                 DEBUG(0, ("talloc failed\n"));
 340                 continuation(private_data_data, False);
 341                 return;
 342         }
 343
 344         state->mem_ctx = mem_ctx;
 345         state->domain = domain;
 346         state->request = request;
 347         state->response = response;
 348         state->continuation = continuation;
 349         state->private_data_data = private_data_data;
 350
 351         init_child_connection(domain, domain_init_recv, state);
 352 }
 353
 354 static void recvfrom_child(void *private_data_data, BOOL success)
 355 {
 356         struct winbindd_cli_state *state =
 357                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 358         enum winbindd_result result = state->response.result;
 359
 360         /* This is an optimization: The child has written directly to the
 361          * response buffer. The request itself is still in pending state,
 362          * state that in the result code. */
 363
 364         state->response.result = WINBINDD_PENDING;
 365
 366         if ((!success) || (result != WINBINDD_OK)) {
 367                 request_error(state);
 368                 return;
 369         }
 370
 371         request_ok(state);
 372 }
 373
 374 void sendto_child(struct winbindd_cli_state *state,
 375                   struct winbindd_child *child)
 376 {
 377         async_request(state->mem_ctx, child, &state->request,
 378                       &state->response, recvfrom_child, state);
 379 }
 380
 381 void sendto_domain(struct winbindd_cli_state *state,
 382                    struct winbindd_domain *domain)
 383 {
 384         async_domain_request(state->mem_ctx, domain,
 385                              &state->request, &state->response,
 386                              recvfrom_child, state);
 387 }
 388
 389 static void domain_init_recv(void *private_data_data, BOOL success)
 390 {
 391         struct domain_request_state *state =
 392                 talloc_get_type_abort(private_data_data, struct domain_request_state);
 393
 394         if (!success) {
 395                 DEBUG(5, ("Domain init returned an error\n"));
 396                 state->continuation(state->private_data_data, False);
 397                 return;
 398         }
 399
 400         async_request(state->mem_ctx, &state->domain->child,
 401                       state->request, state->response,
 402                       state->continuation, state->private_data_data);
 403 }
 404
 405 struct winbindd_child_dispatch_table {
 406         enum winbindd_cmd cmd;
 407         enum winbindd_result (*fn)(struct winbindd_domain *domain,
 408                                    struct winbindd_cli_state *state);
 409         const char *winbindd_cmd_name;
 410 };
 411
 412 static struct winbindd_child_dispatch_table child_dispatch_table[] = {
 413
 414         { WINBINDD_LOOKUPSID,            winbindd_dual_lookupsid,             "LOOKUPSID" },
 415         { WINBINDD_LOOKUPNAME,           winbindd_dual_lookupname,            "LOOKUPNAME" },
 416         { WINBINDD_LOOKUPRIDS,           winbindd_dual_lookuprids,            "LOOKUPRIDS" },
 417         { WINBINDD_LIST_TRUSTDOM,        winbindd_dual_list_trusted_domains,  "LIST_TRUSTDOM" },
 418         { WINBINDD_INIT_CONNECTION,      winbindd_dual_init_connection,       "INIT_CONNECTION" },
 419         { WINBINDD_GETDCNAME,            winbindd_dual_getdcname,             "GETDCNAME" },
 420         { WINBINDD_SHOW_SEQUENCE,        winbindd_dual_show_sequence,         "SHOW_SEQUENCE" },
 421         { WINBINDD_PAM_AUTH,             winbindd_dual_pam_auth,              "PAM_AUTH" },
 422         { WINBINDD_PAM_AUTH_CRAP,        winbindd_dual_pam_auth_crap,         "AUTH_CRAP" },
 423         { WINBINDD_PAM_LOGOFF,           winbindd_dual_pam_logoff,            "PAM_LOGOFF" },
 424         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP,winbindd_dual_pam_chng_pswd_auth_crap,"CHNG_PSWD_AUTH_CRAP" },
 425         { WINBINDD_PAM_CHAUTHTOK,        winbindd_dual_pam_chauthtok,         "PAM_CHAUTHTOK" },
 426         { WINBINDD_CHECK_MACHACC,        winbindd_dual_check_machine_acct,    "CHECK_MACHACC" },
 427         { WINBINDD_DUAL_SID2UID,         winbindd_dual_sid2uid,               "DUAL_SID2UID" },
 428         { WINBINDD_DUAL_SID2GID,         winbindd_dual_sid2gid,               "DUAL_SID2GID" },
 429 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 430         { WINBINDD_DUAL_SIDS2XIDS,       winbindd_dual_sids2xids,             "DUAL_SIDS2XIDS" },
 431 #endif  /* end DISABLED */
 432         { WINBINDD_DUAL_UID2SID,         winbindd_dual_uid2sid,               "DUAL_UID2SID" },
 433         { WINBINDD_DUAL_GID2SID,         winbindd_dual_gid2sid,               "DUAL_GID2SID" },
 434         { WINBINDD_DUAL_UID2NAME,        winbindd_dual_uid2name,              "DUAL_UID2NAME" },
 435         { WINBINDD_DUAL_NAME2UID,        winbindd_dual_name2uid,              "DUAL_NAME2UID" },
 436         { WINBINDD_DUAL_GID2NAME,        winbindd_dual_gid2name,              "DUAL_GID2NAME" },
 437         { WINBINDD_DUAL_NAME2GID,        winbindd_dual_name2gid,              "DUAL_NAME2GID" },
 438         { WINBINDD_DUAL_SET_MAPPING,     winbindd_dual_set_mapping,           "DUAL_SET_MAPPING" },
 439         { WINBINDD_DUAL_SET_HWM,         winbindd_dual_set_hwm,               "DUAL_SET_HWMS" },
 440         { WINBINDD_DUAL_DUMP_MAPS,       winbindd_dual_dump_maps,             "DUAL_DUMP_MAPS" },
 441         { WINBINDD_DUAL_USERINFO,        winbindd_dual_userinfo,              "DUAL_USERINFO" },
 442         { WINBINDD_ALLOCATE_UID,         winbindd_dual_allocate_uid,          "ALLOCATE_UID" },
 443         { WINBINDD_ALLOCATE_GID,         winbindd_dual_allocate_gid,          "ALLOCATE_GID" },
 444         { WINBINDD_GETUSERDOMGROUPS,     winbindd_dual_getuserdomgroups,      "GETUSERDOMGROUPS" },
 445         { WINBINDD_DUAL_GETSIDALIASES,   winbindd_dual_getsidaliases,         "GETSIDALIASES" },
 446         { WINBINDD_CCACHE_NTLMAUTH,      winbindd_dual_ccache_ntlm_auth,      "CCACHE_NTLM_AUTH" },
 447         /* End of list */
 448
 449         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 450 };
 451
 452 static void child_process_request(struct winbindd_domain *domain,
 453                                   struct winbindd_cli_state *state)
 454 {
 455         struct winbindd_child_dispatch_table *table;
 456
 457         /* Free response data - we may be interrupted and receive another
 458            command before being able to send this data off. */
 459
 460         state->response.result = WINBINDD_ERROR;
 461         state->response.length = sizeof(struct winbindd_response);
 462
 463         state->mem_ctx = talloc_init("winbind request");
 464         if (state->mem_ctx == NULL)
 465                 return;
 466
 467         /* Process command */
 468
 469         for (table = child_dispatch_table; table->fn; table++) {
 470                 if (state->request.cmd == table->cmd) {
 471                         DEBUG(10,("process_request: request fn %s\n",
 472                                   table->winbindd_cmd_name ));
 473                         state->response.result = table->fn(domain, state);
 474                         break;
 475                 }
 476         }
 477
 478         if (!table->fn) {
 479                 DEBUG(10,("process_request: unknown request fn number %d\n",
 480                           (int)state->request.cmd ));
 481                 state->response.result = WINBINDD_ERROR;
 482         }
 483
 484         talloc_destroy(state->mem_ctx);
 485 }
 486
 487 void setup_domain_child(struct winbindd_domain *domain,
 488                         struct winbindd_child *child,
 489                         const char *explicit_logfile)
 490 {
 491         if (explicit_logfile != NULL) {
 492                 pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
 493                              dyn_LOGFILEBASE, explicit_logfile);
 494         } else if (domain != NULL) {
 495                 pstr_sprintf(child->logfilename, "%s/log.wb-%s",
 496                              dyn_LOGFILEBASE, domain->name);
 497         } else {
 498                 smb_panic("Internal error: domain == NULL && "
 499                           "explicit_logfile == NULL");
 500         }
 501
 502         child->domain = domain;
 503 }
 504
 505 struct winbindd_child *children = NULL;
 506
 507 void winbind_child_died(pid_t pid)
 508 {
 509         struct winbindd_child *child;
 510
 511         for (child = children; child != NULL; child = child->next) {
 512                 if (child->pid == pid) {
 513                         break;
 514                 }
 515         }
 516
 517         if (child == NULL) {
 518                 DEBUG(0, ("Unknown child %d died!\n", pid));
 519                 return;
 520         }
 521
 522         remove_fd_event(&child->event);
 523         close(child->event.fd);
 524         child->event.fd = 0;
 525         child->event.flags = 0;
 526         child->pid = 0;
 527
 528         schedule_async_request(child);
 529 }
 530
 531 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 532
 533 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 534 {
 535         flush_negative_conn_cache_for_domain(domain->name);
 536         if (*domain->alt_name) {
 537                 flush_negative_conn_cache_for_domain(domain->alt_name);
 538         }
 539 }
 540
 541 /* Set our domains as offline and forward the offline message to our children. */
 542
 543 void winbind_msg_offline(struct messaging_context *msg_ctx,
 544                          void *private_data,
 545                          uint32_t msg_type,
 546                          struct server_id server_id,
 547                          DATA_BLOB *data)
 548 {
 549         struct winbindd_child *child;
 550         struct winbindd_domain *domain;
 551
 552         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 553
 554         if (!lp_winbind_offline_logon()) {
 555                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 556                 return;
 557         }
 558
 559         /* Set our global state as offline. */
 560         if (!set_global_winbindd_state_offline()) {
 561                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 562                 return;
 563         }
 564
 565         /* Set all our domains as offline. */
 566         for (domain = domain_list(); domain; domain = domain->next) {
 567                 if (domain->internal) {
 568                         continue;
 569                 }
 570                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 571                 set_domain_offline(domain);
 572         }
 573
 574         for (child = children; child != NULL; child = child->next) {
 575                 /* Don't send message to idmap child.  We've already
 576                    done so above. */
 577                 if (!child->domain || (child == idmap_child())) {
 578                         continue;
 579                 }
 580
 581                 /* Or internal domains (this should not be possible....) */
 582                 if (child->domain->internal) {
 583                         continue;
 584                 }
 585
 586                 /* Each winbindd child should only process requests for one domain - make sure
 587                    we only set it online / offline for that domain. */
 588
 589                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 590                         (unsigned int)child->pid, domain->name ));
 591
 592                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 593                                    MSG_WINBIND_OFFLINE,
 594                                    (uint8 *)child->domain->name,
 595                                    strlen(child->domain->name)+1);
 596         }
 597 }
 598
 599 /* Set our domains as online and forward the online message to our children. */
 600
 601 void winbind_msg_online(struct messaging_context *msg_ctx,
 602                         void *private_data,
 603                         uint32_t msg_type,
 604                         struct server_id server_id,
 605                         DATA_BLOB *data)
 606 {
 607         struct winbindd_child *child;
 608         struct winbindd_domain *domain;
 609
 610         DEBUG(10,("winbind_msg_online: got online message.\n"));
 611
 612         if (!lp_winbind_offline_logon()) {
 613                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 614                 return;
 615         }
 616
 617         /* Set our global state as online. */
 618         set_global_winbindd_state_online();
 619
 620         smb_nscd_flush_user_cache();
 621         smb_nscd_flush_group_cache();
 622
 623         /* Set all our domains as online. */
 624         for (domain = domain_list(); domain; domain = domain->next) {
 625                 if (domain->internal) {
 626                         continue;
 627                 }
 628                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 629
 630                 winbindd_flush_negative_conn_cache(domain);
 631                 set_domain_online_request(domain);
 632
 633                 /* Send an online message to the idmap child when our
 634                    primary domain comes back online */
 635
 636                 if ( domain->primary ) {
 637                         struct winbindd_child *idmap = idmap_child();
 638
 639                         if ( idmap->pid != 0 ) {
 640                                 messaging_send_buf(msg_ctx,
 641                                                    pid_to_procid(idmap->pid),
 642                                                    MSG_WINBIND_ONLINE,
 643                                                    (uint8 *)domain->name,
 644                                                    strlen(domain->name)+1);
 645                         }
 646
 647                 }
 648         }
 649
 650         for (child = children; child != NULL; child = child->next) {
 651                 /* Don't send message to idmap child. */
 652                 if (!child->domain || (child == idmap_child())) {
 653                         continue;
 654                 }
 655
 656                 /* Or internal domains (this should not be possible....) */
 657                 if (child->domain->internal) {
 658                         continue;
 659                 }
 660
 661                 /* Each winbindd child should only process requests for one domain - make sure
 662                    we only set it online / offline for that domain. */
 663
 664                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 665                         (unsigned int)child->pid, child->domain->name ));
 666
 667                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 668                                    MSG_WINBIND_ONLINE,
 669                                    (uint8 *)child->domain->name,
 670                                    strlen(child->domain->name)+1);
 671         }
 672 }
 673
 674 /* Forward the online/offline messages to our children. */
 675 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 676                               void *private_data,
 677                               uint32_t msg_type,
 678                               struct server_id server_id,
 679                               DATA_BLOB *data)
 680 {
 681         struct winbindd_child *child;
 682
 683         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 684
 685         for (child = children; child != NULL; child = child->next) {
 686                 if (child->domain && child->domain->primary) {
 687                         DEBUG(10,("winbind_msg_onlinestatus: "
 688                                   "sending message to pid %u of primary domain.\n",
 689                                   (unsigned int)child->pid));
 690                         messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 691                                            MSG_WINBIND_ONLINESTATUS,
 692                                            (uint8 *)data->data,
 693                                            data->length);
 694                         break;
 695                 }
 696         }
 697 }
 698
 699
 700 static void account_lockout_policy_handler(struct event_context *ctx,
 701                                            struct timed_event *te,
 702                                            const struct timeval *now,
 703                                            void *private_data)
 704 {
 705         struct winbindd_child *child =
 706                 (struct winbindd_child *)private_data;
 707         TALLOC_CTX *mem_ctx = NULL;
 708         struct winbindd_methods *methods;
 709         SAM_UNK_INFO_12 lockout_policy;
 710         NTSTATUS result;
 711
 712         DEBUG(10,("account_lockout_policy_handler called\n"));
 713
 714         if (child->lockout_policy_event) {
 715                 TALLOC_FREE(child->lockout_policy_event);
 716         }
 717
 718         if ( !winbindd_can_contact_domain( child->domain ) ) {
 719                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 720                           "do not have an incoming trust to domain %s\n",
 721                           child->domain->name));
 722
 723                 return;
 724         }
 725
 726         methods = child->domain->methods;
 727
 728         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 729         if (!mem_ctx) {
 730                 result = NT_STATUS_NO_MEMORY;
 731         } else {
 732                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 733         }
 734
 735         talloc_destroy(mem_ctx);
 736
 737         if (!NT_STATUS_IS_OK(result)) {
 738                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 739                          nt_errstr(result)));
 740         }
 741
 742         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 743                                                       timeval_current_ofs(3600, 0),
 744                                                       "account_lockout_policy_handler",
 745                                                       account_lockout_policy_handler,
 746                                                       child);
 747 }
 748
 749 /* Deal with a request to go offline. */
 750
 751 static void child_msg_offline(struct messaging_context *msg,
 752                               void *private_data,
 753                               uint32_t msg_type,
 754                               struct server_id server_id,
 755                               DATA_BLOB *data)
 756 {
 757         struct winbindd_domain *domain;
 758         const char *domainname = (const char *)data->data;
 759
 760         if (data->data == NULL || data->length == 0) {
 761                 return;
 762         }
 763
 764         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 765
 766         if (!lp_winbind_offline_logon()) {
 767                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 768                 return;
 769         }
 770
 771         /* Mark the requested domain offline. */
 772
 773         for (domain = domain_list(); domain; domain = domain->next) {
 774                 if (domain->internal) {
 775                         continue;
 776                 }
 777                 if (strequal(domain->name, domainname)) {
 778                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 779                         set_domain_offline(domain);
 780                 }
 781         }
 782 }
 783
 784 /* Deal with a request to go online. */
 785
 786 static void child_msg_online(struct messaging_context *msg,
 787                              void *private_data,
 788                              uint32_t msg_type,
 789                              struct server_id server_id,
 790                              DATA_BLOB *data)
 791 {
 792         struct winbindd_domain *domain;
 793         const char *domainname = (const char *)data->data;
 794
 795         if (data->data == NULL || data->length == 0) {
 796                 return;
 797         }
 798
 799         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 800
 801         if (!lp_winbind_offline_logon()) {
 802                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 803                 return;
 804         }
 805
 806         /* Set our global state as online. */
 807         set_global_winbindd_state_online();
 808
 809         /* Try and mark everything online - delete any negative cache entries
 810            to force a reconnect now. */
 811
 812         for (domain = domain_list(); domain; domain = domain->next) {
 813                 if (domain->internal) {
 814                         continue;
 815                 }
 816                 if (strequal(domain->name, domainname)) {
 817                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 818                         winbindd_flush_negative_conn_cache(domain);
 819                         set_domain_online_request(domain);
 820                 }
 821         }
 822 }
 823
 824 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 825 {
 826         struct winbindd_domain *domain;
 827         char *buf = NULL;
 828
 829         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 830                                    get_global_winbindd_state_offline() ?
 831                                    "Offline":"Online")) == NULL) {
 832                 return NULL;
 833         }
 834
 835         for (domain = domain_list(); domain; domain = domain->next) {
 836                 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
 837                                                   domain->name,
 838                                                   domain->online ?
 839                                                   "Online":"Offline")) == NULL) {
 840                         return NULL;
 841                 }
 842         }
 843
 844         buf = talloc_asprintf_append(buf, "\n");
 845
 846         DEBUG(5,("collect_onlinestatus: %s", buf));
 847
 848         return buf;
 849 }
 850
 851 static void child_msg_onlinestatus(struct messaging_context *msg_ctx,
 852                                    void *private_data,
 853                                    uint32_t msg_type,
 854                                    struct server_id server_id,
 855                                    DATA_BLOB *data)
 856 {
 857         TALLOC_CTX *mem_ctx;
 858         const char *message;
 859         struct server_id *sender;
 860
 861         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 862
 863         if (!data->data) {
 864                 return;
 865         }
 866
 867         sender = (struct server_id *)data->data;
 868
 869         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 870         if (mem_ctx == NULL) {
 871                 return;
 872         }
 873
 874         message = collect_onlinestatus(mem_ctx);
 875         if (message == NULL) {
 876                 talloc_destroy(mem_ctx);
 877                 return;
 878         }
 879
 880         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 881                            (uint8 *)message, strlen(message) + 1);
 882
 883         talloc_destroy(mem_ctx);
 884 }
 885
 886 static BOOL fork_domain_child(struct winbindd_child *child)
 887 {
 888         int fdpair[2];
 889         struct winbindd_cli_state state;
 890         struct winbindd_domain *domain;
 891
 892         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 893                 DEBUG(0, ("Could not open child pipe: %s\n",
 894                           strerror(errno)));
 895                 return False;
 896         }
 897
 898         ZERO_STRUCT(state);
 899         state.pid = sys_getpid();
 900
 901         /* Stop zombies */
 902         CatchChild();
 903
 904         child->pid = sys_fork();
 905
 906         if (child->pid == -1) {
 907                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 908                 return False;
 909         }
 910
 911         if (child->pid != 0) {
 912                 /* Parent */
 913                 close(fdpair[0]);
 914                 child->next = child->prev = NULL;
 915                 DLIST_ADD(children, child);
 916                 child->event.fd = fdpair[1];
 917                 child->event.flags = 0;
 918                 child->requests = NULL;
 919                 add_fd_event(&child->event);
 920                 return True;
 921         }
 922
 923         /* Child */
 924
 925         state.sock = fdpair[0];
 926         close(fdpair[1]);
 927
 928         /* tdb needs special fork handling */
 929         if (tdb_reopen_all(1) == -1) {
 930                 DEBUG(0,("tdb_reopen_all failed.\n"));
 931                 _exit(0);
 932         }
 933
 934         close_conns_after_fork();
 935
 936         if (!override_logfile) {
 937                 lp_set_logfile(child->logfilename);
 938                 reopen_logs();
 939         }
 940
 941         /*
 942          * For clustering, we need to re-init our ctdbd connection after the
 943          * fork
 944          */
 945         if (!NT_STATUS_IS_OK(messaging_reinit(winbind_messaging_context())))
 946                 exit(1);
 947
 948         /* Don't handle the same messages as our parent. */
 949         messaging_deregister(winbind_messaging_context(),
 950                              MSG_SMB_CONF_UPDATED, NULL);
 951         messaging_deregister(winbind_messaging_context(),
 952                              MSG_SHUTDOWN, NULL);
 953         messaging_deregister(winbind_messaging_context(),
 954                              MSG_WINBIND_OFFLINE, NULL);
 955         messaging_deregister(winbind_messaging_context(),
 956                              MSG_WINBIND_ONLINE, NULL);
 957         messaging_deregister(winbind_messaging_context(),
 958                              MSG_WINBIND_ONLINESTATUS, NULL);
 959
 960         /* Handle online/offline messages. */
 961         messaging_register(winbind_messaging_context(), NULL,
 962                            MSG_WINBIND_OFFLINE, child_msg_offline);
 963         messaging_register(winbind_messaging_context(), NULL,
 964                            MSG_WINBIND_ONLINE, child_msg_online);
 965         messaging_register(winbind_messaging_context(), NULL,
 966                            MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus);
 967
 968         if ( child->domain ) {
 969                 child->domain->startup = True;
 970                 child->domain->startup_time = time(NULL);
 971         }
 972
 973         /* Ensure we have no pending check_online events other
 974            than one for this domain. */
 975
 976         for (domain = domain_list(); domain; domain = domain->next) {
 977                 if (domain != child->domain) {
 978                         if (domain->check_online_event) {
 979                                 TALLOC_FREE(domain->check_online_event);
 980                         }
 981                 }
 982         }
 983
 984         /* Ensure we're not handling an event inherited from
 985            our parent. */
 986
 987         cancel_named_event(winbind_event_context(),
 988                            "krb5_ticket_refresh_handler");
 989
 990         /* We might be in the idmap child...*/
 991         if (child->domain && !(child->domain->internal) &&
 992             lp_winbind_offline_logon()) {
 993
 994                 set_domain_online_request(child->domain);
 995
 996                 child->lockout_policy_event = event_add_timed(
 997                         winbind_event_context(), NULL, timeval_zero(),
 998                         "account_lockout_policy_handler",
 999                         account_lockout_policy_handler,
1000                         child);
1001         }
1002
1003         while (1) {
1004
1005                 int ret;
1006                 fd_set read_fds;
1007                 struct timeval t;
1008                 struct timeval *tp;
1009                 struct timeval now;
1010
1011                 /* free up any talloc memory */
1012                 lp_TALLOC_FREE();
1013                 main_loop_TALLOC_FREE();
1014
1015                 run_events(winbind_event_context(), 0, NULL, NULL);
1016
1017                 GetTimeOfDay(&now);
1018
1019                 if (child->domain && child->domain->startup &&
1020                                 (now.tv_sec > child->domain->startup_time + 30)) {
1021                         /* No longer in "startup" mode. */
1022                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1023                                 child->domain->name ));
1024                         child->domain->startup = False;
1025                 }
1026
1027                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1028                 if (tp) {
1029                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1030                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1031                 }
1032
1033                 /* Handle messages */
1034
1035                 message_dispatch(winbind_messaging_context());
1036
1037                 FD_ZERO(&read_fds);
1038                 FD_SET(state.sock, &read_fds);
1039
1040                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
1041
1042                 if (ret == 0) {
1043                         DEBUG(11,("nothing is ready yet, continue\n"));
1044                         continue;
1045                 }
1046
1047                 if (ret == -1 && errno == EINTR) {
1048                         /* We got a signal - continue. */
1049                         continue;
1050                 }
1051
1052                 if (ret == -1 && errno != EINTR) {
1053                         DEBUG(0,("select error occured\n"));
1054                         perror("select");
1055                         return False;
1056                 }
1057
1058                 /* fetch a request from the main daemon */
1059                 child_read_request(&state);
1060
1061                 if (state.finished) {
1062                         /* we lost contact with our parent */
1063                         exit(0);
1064                 }
1065
1066                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
1067
1068                 ZERO_STRUCT(state.response);
1069                 state.request.null_term = '\0';
1070                 child_process_request(child->domain, &state);
1071
1072                 SAFE_FREE(state.request.extra_data.data);
1073
1074                 cache_store_response(sys_getpid(), &state.response);
1075
1076                 SAFE_FREE(state.response.extra_data.data);
1077
1078                 /* We just send the result code back, the result
1079                  * structure needs to be fetched via the
1080                  * winbindd_cache. Hmm. That needs fixing... */
1081
1082                 if (write_data(state.sock,
1083                                (const char *)&state.response.result,
1084                                sizeof(state.response.result)) !=
1085                     sizeof(state.response.result)) {
1086                         DEBUG(0, ("Could not write result\n"));
1087                         exit(1);
1088                 }
1089         }
1090 }