source/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 /* Read some data from a client connection */
  38
  39 static void child_read_request(struct winbindd_cli_state *state)
  40 {
  41         ssize_t len;
  42
  43         /* Read data */
  44
  45         len = read_data(state->sock, (char *)&state->request,
  46                         sizeof(state->request));
  47
  48         if (len != sizeof(state->request)) {
  49                 DEBUG(0, ("Got invalid request length: %d\n", (int)len));
  50                 state->finished = True;
  51                 return;
  52         }
  53
  54         if (state->request.extra_len == 0) {
  55                 state->request.extra_data.data = NULL;
  56                 return;
  57         }
  58
  59         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request.extra_len));
  60
  61         state->request.extra_data.data =
  62                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
  63
  64         if (state->request.extra_data.data == NULL) {
  65                 DEBUG(0, ("malloc failed\n"));
  66                 state->finished = True;
  67                 return;
  68         }
  69
  70         /* Ensure null termination */
  71         state->request.extra_data.data[state->request.extra_len] = '\0';
  72
  73         len = read_data(state->sock, state->request.extra_data.data,
  74                         state->request.extra_len);
  75
  76         if (len != state->request.extra_len) {
  77                 DEBUG(0, ("Could not read extra data\n"));
  78                 state->finished = True;
  79                 return;
  80         }
  81 }
  82
  83 /*
  84  * Machinery for async requests sent to children. You set up a
  85  * winbindd_request, select a child to query, and issue a async_request
  86  * call. When the request is completed, the callback function you specified is
  87  * called back with the private pointer you gave to async_request.
  88  */
  89
  90 struct winbindd_async_request {
  91         struct winbindd_async_request *next, *prev;
  92         TALLOC_CTX *mem_ctx;
  93         struct winbindd_child *child;
  94         struct winbindd_request *request;
  95         struct winbindd_response *response;
  96         void (*continuation)(void *private_data, BOOL success);
  97         void *private_data;
  98 };
  99
 100 static void async_main_request_sent(void *private_data, BOOL success);
 101 static void async_request_sent(void *private_data, BOOL success);
 102 static void async_reply_recv(void *private_data, BOOL success);
 103 static void schedule_async_request(struct winbindd_child *child);
 104
 105 void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
 106                    struct winbindd_request *request,
 107                    struct winbindd_response *response,
 108                    void (*continuation)(void *private_data, BOOL success),
 109                    void *private_data)
 110 {
 111         struct winbindd_async_request *state, *tmp;
 112
 113         SMB_ASSERT(continuation != NULL);
 114
 115         state = TALLOC_P(mem_ctx, struct winbindd_async_request);
 116
 117         if (state == NULL) {
 118                 DEBUG(0, ("talloc failed\n"));
 119                 continuation(private_data, False);
 120                 return;
 121         }
 122
 123         state->mem_ctx = mem_ctx;
 124         state->child = child;
 125         state->request = request;
 126         state->response = response;
 127         state->continuation = continuation;
 128         state->private_data = private_data;
 129
 130         DLIST_ADD_END(child->requests, state, tmp);
 131
 132         schedule_async_request(child);
 133
 134         return;
 135 }
 136
 137 static void async_main_request_sent(void *private_data, BOOL success)
 138 {
 139         struct winbindd_async_request *state =
 140                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 141
 142         if (!success) {
 143                 DEBUG(5, ("Could not send async request\n"));
 144
 145                 state->response->length = sizeof(struct winbindd_response);
 146                 state->response->result = WINBINDD_ERROR;
 147                 state->continuation(state->private_data, False);
 148                 return;
 149         }
 150
 151         if (state->request->extra_len == 0) {
 152                 async_request_sent(private_data, True);
 153                 return;
 154         }
 155
 156         setup_async_write(&state->child->event, state->request->extra_data.data,
 157                           state->request->extra_len,
 158                           async_request_sent, state);
 159 }
 160
 161 static void async_request_sent(void *private_data_data, BOOL success)
 162 {
 163         struct winbindd_async_request *state =
 164                 talloc_get_type_abort(private_data_data, struct winbindd_async_request);
 165
 166         if (!success) {
 167                 DEBUG(5, ("Could not send async request\n"));
 168
 169                 state->response->length = sizeof(struct winbindd_response);
 170                 state->response->result = WINBINDD_ERROR;
 171                 state->continuation(state->private_data, False);
 172                 return;
 173         }
 174
 175         /* Request successfully sent to the child, setup the wait for reply */
 176
 177         setup_async_read(&state->child->event,
 178                          &state->response->result,
 179                          sizeof(state->response->result),
 180                          async_reply_recv, state);
 181 }
 182
 183 static void async_reply_recv(void *private_data, BOOL success)
 184 {
 185         struct winbindd_async_request *state =
 186                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 187         struct winbindd_child *child = state->child;
 188
 189         state->response->length = sizeof(struct winbindd_response);
 190
 191         if (!success) {
 192                 DEBUG(5, ("Could not receive async reply\n"));
 193                 state->response->result = WINBINDD_ERROR;
 194                 return;
 195         }
 196
 197         SMB_ASSERT(cache_retrieve_response(child->pid,
 198                                            state->response));
 199
 200         cache_cleanup_response(child->pid);
 201
 202         DLIST_REMOVE(child->requests, state);
 203
 204         schedule_async_request(child);
 205
 206         state->continuation(state->private_data, True);
 207 }
 208
 209 static BOOL fork_domain_child(struct winbindd_child *child);
 210
 211 static void schedule_async_request(struct winbindd_child *child)
 212 {
 213         struct winbindd_async_request *request = child->requests;
 214
 215         if (request == NULL) {
 216                 return;
 217         }
 218
 219         if (child->event.flags != 0) {
 220                 return;         /* Busy */
 221         }
 222
 223         if ((child->pid == 0) && (!fork_domain_child(child))) {
 224                 /* Cancel all outstanding requests */
 225
 226                 while (request != NULL) {
 227                         /* request might be free'd in the continuation */
 228                         struct winbindd_async_request *next = request->next;
 229                         request->continuation(request->private_data, False);
 230                         request = next;
 231                 }
 232                 return;
 233         }
 234
 235         setup_async_write(&child->event, request->request,
 236                           sizeof(*request->request),
 237                           async_main_request_sent, request);
 238
 239         talloc_destroy(child->mem_ctx);
 240         return;
 241 }
 242
 243 struct domain_request_state {
 244         TALLOC_CTX *mem_ctx;
 245         struct winbindd_domain *domain;
 246         struct winbindd_request *request;
 247         struct winbindd_response *response;
 248         void (*continuation)(void *private_data_data, BOOL success);
 249         void *private_data_data;
 250 };
 251
 252 static void domain_init_recv(void *private_data_data, BOOL success);
 253
 254 void async_domain_request(TALLOC_CTX *mem_ctx,
 255                           struct winbindd_domain *domain,
 256                           struct winbindd_request *request,
 257                           struct winbindd_response *response,
 258                           void (*continuation)(void *private_data_data, BOOL success),
 259                           void *private_data_data)
 260 {
 261         struct domain_request_state *state;
 262
 263         if (domain->initialized) {
 264                 async_request(mem_ctx, &domain->child, request, response,
 265                               continuation, private_data_data);
 266                 return;
 267         }
 268
 269         state = TALLOC_P(mem_ctx, struct domain_request_state);
 270         if (state == NULL) {
 271                 DEBUG(0, ("talloc failed\n"));
 272                 continuation(private_data_data, False);
 273                 return;
 274         }
 275
 276         state->mem_ctx = mem_ctx;
 277         state->domain = domain;
 278         state->request = request;
 279         state->response = response;
 280         state->continuation = continuation;
 281         state->private_data_data = private_data_data;
 282
 283         init_child_connection(domain, domain_init_recv, state);
 284 }
 285
 286 static void recvfrom_child(void *private_data_data, BOOL success)
 287 {
 288         struct winbindd_cli_state *state =
 289                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 290         enum winbindd_result result = state->response.result;
 291
 292         /* This is an optimization: The child has written directly to the
 293          * response buffer. The request itself is still in pending state,
 294          * state that in the result code. */
 295
 296         state->response.result = WINBINDD_PENDING;
 297
 298         if ((!success) || (result != WINBINDD_OK)) {
 299                 request_error(state);
 300                 return;
 301         }
 302
 303         request_ok(state);
 304 }
 305
 306 void sendto_child(struct winbindd_cli_state *state,
 307                   struct winbindd_child *child)
 308 {
 309         async_request(state->mem_ctx, child, &state->request,
 310                       &state->response, recvfrom_child, state);
 311 }
 312
 313 void sendto_domain(struct winbindd_cli_state *state,
 314                    struct winbindd_domain *domain)
 315 {
 316         async_domain_request(state->mem_ctx, domain,
 317                              &state->request, &state->response,
 318                              recvfrom_child, state);
 319 }
 320
 321 static void domain_init_recv(void *private_data_data, BOOL success)
 322 {
 323         struct domain_request_state *state =
 324                 talloc_get_type_abort(private_data_data, struct domain_request_state);
 325
 326         if (!success) {
 327                 DEBUG(5, ("Domain init returned an error\n"));
 328                 state->continuation(state->private_data_data, False);
 329                 return;
 330         }
 331
 332         async_request(state->mem_ctx, &state->domain->child,
 333                       state->request, state->response,
 334                       state->continuation, state->private_data_data);
 335 }
 336
 337 struct winbindd_child_dispatch_table {
 338         enum winbindd_cmd cmd;
 339         enum winbindd_result (*fn)(struct winbindd_domain *domain,
 340                                    struct winbindd_cli_state *state);
 341         const char *winbindd_cmd_name;
 342 };
 343
 344 static struct winbindd_child_dispatch_table child_dispatch_table[] = {
 345
 346         { WINBINDD_LOOKUPSID,            winbindd_dual_lookupsid,             "LOOKUPSID" },
 347         { WINBINDD_LOOKUPNAME,           winbindd_dual_lookupname,            "LOOKUPNAME" },
 348         { WINBINDD_LIST_TRUSTDOM,        winbindd_dual_list_trusted_domains,  "LIST_TRUSTDOM" },
 349         { WINBINDD_INIT_CONNECTION,      winbindd_dual_init_connection,       "INIT_CONNECTION" },
 350         { WINBINDD_GETDCNAME,            winbindd_dual_getdcname,             "GETDCNAME" },
 351         { WINBINDD_SHOW_SEQUENCE,        winbindd_dual_show_sequence,         "SHOW_SEQUENCE" },
 352         { WINBINDD_PAM_AUTH,             winbindd_dual_pam_auth,              "PAM_AUTH" },
 353         { WINBINDD_PAM_AUTH_CRAP,        winbindd_dual_pam_auth_crap,         "AUTH_CRAP" },
 354         { WINBINDD_PAM_LOGOFF,           winbindd_dual_pam_logoff,            "PAM_LOGOFF" },
 355         { WINBINDD_CHECK_MACHACC,        winbindd_dual_check_machine_acct,    "CHECK_MACHACC" },
 356         { WINBINDD_DUAL_SID2UID,         winbindd_dual_sid2uid,               "DUAL_SID2UID" },
 357         { WINBINDD_DUAL_SID2GID,         winbindd_dual_sid2gid,               "DUAL_SID2GID" },
 358         { WINBINDD_DUAL_UID2NAME,        winbindd_dual_uid2name,              "DUAL_UID2NAME" },
 359         { WINBINDD_DUAL_NAME2UID,        winbindd_dual_name2uid,              "DUAL_NAME2UID" },
 360         { WINBINDD_DUAL_GID2NAME,        winbindd_dual_gid2name,              "DUAL_GID2NAME" },
 361         { WINBINDD_DUAL_NAME2GID,        winbindd_dual_name2gid,              "DUAL_NAME2GID" },
 362         { WINBINDD_DUAL_IDMAPSET,        winbindd_dual_idmapset,              "DUAL_IDMAPSET" },
 363         { WINBINDD_DUAL_USERINFO,        winbindd_dual_userinfo,              "DUAL_USERINFO" },
 364         { WINBINDD_ALLOCATE_UID,         winbindd_dual_allocate_uid,          "ALLOCATE_UID" },
 365         { WINBINDD_ALLOCATE_GID,         winbindd_dual_allocate_gid,          "ALLOCATE_GID" },
 366         { WINBINDD_GETUSERDOMGROUPS,     winbindd_dual_getuserdomgroups,      "GETUSERDOMGROUPS" },
 367         { WINBINDD_DUAL_GETSIDALIASES,   winbindd_dual_getsidaliases,         "GETSIDALIASES" },
 368         /* End of list */
 369
 370         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 371 };
 372
 373 static void child_process_request(struct winbindd_domain *domain,
 374                                   struct winbindd_cli_state *state)
 375 {
 376         struct winbindd_child_dispatch_table *table;
 377
 378         /* Free response data - we may be interrupted and receive another
 379            command before being able to send this data off. */
 380
 381         state->response.result = WINBINDD_ERROR;
 382         state->response.length = sizeof(struct winbindd_response);
 383
 384         state->mem_ctx = talloc_init("winbind request");
 385         if (state->mem_ctx == NULL)
 386                 return;
 387
 388         /* Process command */
 389
 390         for (table = child_dispatch_table; table->fn; table++) {
 391                 if (state->request.cmd == table->cmd) {
 392                         DEBUG(10,("process_request: request fn %s\n",
 393                                   table->winbindd_cmd_name ));
 394                         state->response.result = table->fn(domain, state);
 395                         break;
 396                 }
 397         }
 398
 399         if (!table->fn) {
 400                 DEBUG(10,("process_request: unknown request fn number %d\n",
 401                           (int)state->request.cmd ));
 402                 state->response.result = WINBINDD_ERROR;
 403         }
 404
 405         talloc_destroy(state->mem_ctx);
 406 }
 407
 408 void setup_domain_child(struct winbindd_domain *domain,
 409                         struct winbindd_child *child,
 410                         const char *explicit_logfile)
 411 {
 412         if (explicit_logfile != NULL) {
 413                 pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
 414                              dyn_LOGFILEBASE, explicit_logfile);
 415         } else if (domain != NULL) {
 416                 pstr_sprintf(child->logfilename, "%s/log.wb-%s",
 417                              dyn_LOGFILEBASE, domain->name);
 418         } else {
 419                 smb_panic("Internal error: domain == NULL && "
 420                           "explicit_logfile == NULL");
 421         }
 422
 423         child->domain = domain;
 424 }
 425
 426 struct winbindd_child *children = NULL;
 427
 428 void winbind_child_died(pid_t pid)
 429 {
 430         struct winbindd_child *child;
 431
 432         for (child = children; child != NULL; child = child->next) {
 433                 if (child->pid == pid) {
 434                         break;
 435                 }
 436         }
 437
 438         if (child == NULL) {
 439                 DEBUG(0, ("Unknown child %d died!\n", pid));
 440                 return;
 441         }
 442
 443         remove_fd_event(&child->event);
 444         close(child->event.fd);
 445         child->event.fd = 0;
 446         child->event.flags = 0;
 447         child->pid = 0;
 448
 449         schedule_async_request(child);
 450 }
 451
 452 /* Forward the online/offline messages to our children. */
 453 void winbind_msg_offline(int msg_type, struct process_id src, void *buf, size_t len)
 454 {
 455         struct winbindd_child *child;
 456
 457         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 458
 459         if (!lp_winbind_offline_logon()) {
 460                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 461                 return;
 462         }
 463
 464         /* Set our global state as offline. */
 465         if (!set_global_winbindd_state_offline()) {
 466                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 467                 return;
 468         }
 469
 470         for (child = children; child != NULL; child = child->next) {
 471                 DEBUG(10,("winbind_msg_offline: sending message to pid %u.\n",
 472                         (unsigned int)child->pid ));
 473                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_OFFLINE, NULL, 0, False);
 474         }
 475 }
 476
 477 /* Forward the online/offline messages to our children. */
 478 void winbind_msg_online(int msg_type, struct process_id src, void *buf, size_t len)
 479 {
 480         struct winbindd_child *child;
 481
 482         DEBUG(10,("winbind_msg_online: got online message.\n"));
 483
 484         if (!lp_winbind_offline_logon()) {
 485                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 486                 return;
 487         }
 488
 489         /* Set our global state as online. */
 490         set_global_winbindd_state_online();
 491
 492         for (child = children; child != NULL; child = child->next) {
 493                 DEBUG(10,("winbind_msg_online: sending message to pid %u.\n",
 494                         (unsigned int)child->pid ));
 495                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_ONLINE, NULL, 0, False);
 496         }
 497 }
 498
 499 /* Forward the online/offline messages to our children. */
 500 void winbind_msg_onlinestatus(int msg_type, struct process_id src, void *buf, size_t len)
 501 {
 502         struct winbindd_child *child;
 503
 504         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 505
 506         for (child = children; child != NULL; child = child->next) {
 507                 if (child->domain && child->domain->primary) {
 508                         DEBUG(10,("winbind_msg_onlinestatus: "
 509                                   "sending message to pid %u of primary domain.\n",
 510                                   (unsigned int)child->pid));
 511                         message_send_pid(pid_to_procid(child->pid),
 512                                          MSG_WINBIND_ONLINESTATUS, buf, len, False);
 513                         break;
 514                 }
 515         }
 516 }
 517
 518
 519 static void account_lockout_policy_handler(struct timed_event *te,
 520                                            const struct timeval *now,
 521                                            void *private_data)
 522 {
 523         struct winbindd_child *child = private_data;
 524
 525         struct winbindd_methods *methods;
 526         SAM_UNK_INFO_12 lockout_policy;
 527         NTSTATUS result;
 528
 529         DEBUG(10,("account_lockout_policy_handler called\n"));
 530
 531         if (child->lockout_policy_event) {
 532                 TALLOC_FREE(child->lockout_policy_event);
 533         }
 534
 535         methods = child->domain->methods;
 536
 537         result = methods->lockout_policy(child->domain, child->mem_ctx, &lockout_policy);
 538         if (!NT_STATUS_IS_OK(result)) {
 539                 DEBUG(10,("account_lockout_policy_handler: failed to call lockout_policy\n"));
 540                 return;
 541         }
 542
 543         child->lockout_policy_event = add_timed_event(child->mem_ctx,
 544                                                       timeval_current_ofs(3600, 0),
 545                                                       "account_lockout_policy_handler",
 546                                                       account_lockout_policy_handler,
 547                                                       child);
 548 }
 549
 550 /* Deal with a request to go offline. */
 551
 552 static void child_msg_offline(int msg_type, struct process_id src, void *buf, size_t len)
 553 {
 554         struct winbindd_domain *domain;
 555
 556         DEBUG(5,("child_msg_offline received.\n"));
 557
 558         if (!lp_winbind_offline_logon()) {
 559                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 560                 return;
 561         }
 562
 563         /* Set our global state as offline. */
 564         if (!set_global_winbindd_state_offline()) {
 565                 DEBUG(10,("child_msg_offline: offline request failed.\n"));
 566                 return;
 567         }
 568
 569         /* Mark all our domains as offline. */
 570
 571         for (domain = domain_list(); domain; domain = domain->next) {
 572                 DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 573                 domain->online = False;
 574         }
 575 }
 576
 577 /* Deal with a request to go online. */
 578
 579 static void child_msg_online(int msg_type, struct process_id src, void *buf, size_t len)
 580 {
 581         struct winbindd_domain *domain;
 582
 583         DEBUG(5,("child_msg_online received.\n"));
 584
 585         if (!lp_winbind_offline_logon()) {
 586                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 587                 return;
 588         }
 589
 590         /* Set our global state as online. */
 591         set_global_winbindd_state_online();
 592
 593         winbindd_flush_nscd_cache();
 594
 595         /* Mark everything online - delete any negative cache entries
 596            to force an immediate reconnect. */
 597
 598         for (domain = domain_list(); domain; domain = domain->next) {
 599                 DEBUG(5,("child_msg_online: marking %s online.\n", domain->name));
 600                 domain->online = True;
 601                 check_negative_conn_cache_timeout(domain->name, domain->dcname, 0);
 602         }
 603 }
 604
 605 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 606 {
 607         struct winbindd_domain *domain;
 608         char *buf = NULL;
 609
 610         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 611                                    get_global_winbindd_state_online() ?
 612                                    "Offline":"Online")) == NULL) {
 613                 return NULL;
 614         }
 615
 616         for (domain = domain_list(); domain; domain = domain->next) {
 617                 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
 618                                                   domain->name,
 619                                                   domain->online ?
 620                                                   "Online":"Offline")) == NULL) {
 621                         return NULL;
 622                 }
 623         }
 624
 625         buf = talloc_asprintf_append(buf, "\n");
 626
 627         DEBUG(5,("collect_onlinestatus: %s", buf));
 628
 629         return buf;
 630 }
 631
 632 static void child_msg_onlinestatus(int msg_type, struct process_id src, void *buf, size_t len)
 633 {
 634         TALLOC_CTX *mem_ctx;
 635         const char *message;
 636         struct process_id *sender;
 637
 638         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 639
 640         if (!buf) {
 641                 return;
 642         }
 643
 644         sender = (struct process_id *)buf;
 645
 646         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 647         if (mem_ctx == NULL) {
 648                 return;
 649         }
 650
 651         message = collect_onlinestatus(mem_ctx);
 652
 653         message_send_pid(*sender, MSG_WINBIND_ONLINESTATUS,
 654                          message, strlen(message) + 1, True);
 655
 656         talloc_destroy(mem_ctx);
 657 }
 658
 659 static BOOL fork_domain_child(struct winbindd_child *child)
 660 {
 661         int fdpair[2];
 662         struct winbindd_cli_state state;
 663         extern BOOL override_logfile;
 664
 665         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 666                 DEBUG(0, ("Could not open child pipe: %s\n",
 667                           strerror(errno)));
 668                 return False;
 669         }
 670
 671         ZERO_STRUCT(state);
 672         state.pid = getpid();
 673
 674         /* Ensure we don't process messages whilst we're
 675            changing the disposition for the child. */
 676         message_block();
 677
 678         child->pid = sys_fork();
 679
 680         if (child->pid == -1) {
 681                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 682                 message_unblock();
 683                 return False;
 684         }
 685
 686         if (child->pid != 0) {
 687                 /* Parent */
 688                 close(fdpair[0]);
 689                 child->next = child->prev = NULL;
 690                 DLIST_ADD(children, child);
 691                 child->event.fd = fdpair[1];
 692                 child->event.flags = 0;
 693                 child->requests = NULL;
 694                 add_fd_event(&child->event);
 695                 /* We're ok with online/offline messages now. */
 696                 message_unblock();
 697                 return True;
 698         }
 699
 700         /* Child */
 701
 702         state.sock = fdpair[0];
 703         close(fdpair[1]);
 704
 705         /* tdb needs special fork handling */
 706         if (tdb_reopen_all(1) == -1) {
 707                 DEBUG(0,("tdb_reopen_all failed.\n"));
 708                 _exit(0);
 709         }
 710
 711         close_conns_after_fork();
 712
 713         if (!override_logfile) {
 714                 lp_set_logfile(child->logfilename);
 715                 reopen_logs();
 716         }
 717
 718         /* Don't handle the same messages as our parent. */
 719         message_deregister(MSG_SMB_CONF_UPDATED);
 720         message_deregister(MSG_SHUTDOWN);
 721         message_deregister(MSG_WINBIND_OFFLINE);
 722         message_deregister(MSG_WINBIND_ONLINE);
 723         message_deregister(MSG_WINBIND_ONLINESTATUS);
 724
 725         /* The child is ok with online/offline messages now. */
 726         message_unblock();
 727
 728         child->mem_ctx = talloc_init("child_mem_ctx");
 729         if (child->mem_ctx == NULL) {
 730                 return False;
 731         }
 732
 733         if (child->domain != NULL) {
 734                 /* We might be in the idmap child...*/
 735                 child->lockout_policy_event = add_timed_event(
 736                         child->mem_ctx, timeval_zero(),
 737                         "account_lockout_policy_handler",
 738                         account_lockout_policy_handler,
 739                         child);
 740         }
 741
 742         /* Handle online/offline messages. */
 743         message_register(MSG_WINBIND_OFFLINE,child_msg_offline);
 744         message_register(MSG_WINBIND_ONLINE,child_msg_online);
 745         message_register(MSG_WINBIND_ONLINESTATUS,child_msg_onlinestatus);
 746
 747         while (1) {
 748
 749                 int ret;
 750                 fd_set read_fds;
 751                 struct timeval t;
 752                 struct timeval *tp;
 753                 struct timeval now;
 754
 755                 /* free up any talloc memory */
 756                 lp_TALLOC_FREE();
 757                 main_loop_TALLOC_FREE();
 758
 759                 run_events();
 760
 761                 GetTimeOfDay(&now);
 762
 763                 tp = get_timed_events_timeout(&t);
 764                 if (tp) {
 765                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
 766                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
 767                 }
 768
 769                 /* Handle messages */
 770
 771                 message_dispatch();
 772
 773                 FD_ZERO(&read_fds);
 774                 FD_SET(state.sock, &read_fds);
 775
 776                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
 777
 778                 if (ret == 0) {
 779                         DEBUG(11,("nothing is ready yet, continue\n"));
 780                         continue;
 781                 }
 782
 783                 if (ret == -1 && errno == EINTR) {
 784                         /* We got a signal - continue. */
 785                         continue;
 786                 }
 787
 788                 if (ret == -1 && errno != EINTR) {
 789                         DEBUG(0,("select error occured\n"));
 790                         perror("select");
 791                         return False;
 792                 }
 793
 794                 /* fetch a request from the main daemon */
 795                 child_read_request(&state);
 796
 797                 if (state.finished) {
 798                         /* we lost contact with our parent */
 799                         exit(0);
 800                 }
 801
 802                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
 803
 804                 ZERO_STRUCT(state.response);
 805                 state.request.null_term = '\0';
 806                 child_process_request(child->domain, &state);
 807
 808                 SAFE_FREE(state.request.extra_data.data);
 809
 810                 cache_store_response(sys_getpid(), &state.response);
 811
 812                 SAFE_FREE(state.response.extra_data.data);
 813
 814                 /* We just send the result code back, the result
 815                  * structure needs to be fetched via the
 816                  * winbindd_cache. Hmm. That needs fixing... */
 817
 818                 if (write_data(state.sock, (void *)&state.response.result,
 819                                sizeof(state.response.result)) !=
 820                     sizeof(state.response.result)) {
 821                         DEBUG(0, ("Could not write result\n"));
 822                         exit(1);
 823                 }
 824         }
 825 }