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_LOOKUPRIDS,           winbindd_dual_lookuprids,            "LOOKUPRIDS" },
 349         { WINBINDD_LIST_TRUSTDOM,        winbindd_dual_list_trusted_domains,  "LIST_TRUSTDOM" },
 350         { WINBINDD_INIT_CONNECTION,      winbindd_dual_init_connection,       "INIT_CONNECTION" },
 351         { WINBINDD_GETDCNAME,            winbindd_dual_getdcname,             "GETDCNAME" },
 352         { WINBINDD_SHOW_SEQUENCE,        winbindd_dual_show_sequence,         "SHOW_SEQUENCE" },
 353         { WINBINDD_PAM_AUTH,             winbindd_dual_pam_auth,              "PAM_AUTH" },
 354         { WINBINDD_PAM_AUTH_CRAP,        winbindd_dual_pam_auth_crap,         "AUTH_CRAP" },
 355         { WINBINDD_PAM_LOGOFF,           winbindd_dual_pam_logoff,            "PAM_LOGOFF" },
 356         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP,winbindd_dual_pam_chng_pswd_auth_crap,"CHNG_PSWD_AUTH_CRAP" },
 357         { WINBINDD_CHECK_MACHACC,        winbindd_dual_check_machine_acct,    "CHECK_MACHACC" },
 358         { WINBINDD_DUAL_SID2UID,         winbindd_dual_sid2uid,               "DUAL_SID2UID" },
 359         { WINBINDD_DUAL_SID2GID,         winbindd_dual_sid2gid,               "DUAL_SID2GID" },
 360         { WINBINDD_DUAL_UID2SID,         winbindd_dual_uid2sid,               "DUAL_UID2SID" },
 361         { WINBINDD_DUAL_GID2SID,         winbindd_dual_gid2sid,               "DUAL_GID2SID" },
 362         { WINBINDD_DUAL_UID2NAME,        winbindd_dual_uid2name,              "DUAL_UID2NAME" },
 363         { WINBINDD_DUAL_NAME2UID,        winbindd_dual_name2uid,              "DUAL_NAME2UID" },
 364         { WINBINDD_DUAL_GID2NAME,        winbindd_dual_gid2name,              "DUAL_GID2NAME" },
 365         { WINBINDD_DUAL_NAME2GID,        winbindd_dual_name2gid,              "DUAL_NAME2GID" },
 366         { WINBINDD_DUAL_IDMAPSET,        winbindd_dual_idmapset,              "DUAL_IDMAPSET" },
 367         { WINBINDD_DUAL_USERINFO,        winbindd_dual_userinfo,              "DUAL_USERINFO" },
 368         { WINBINDD_ALLOCATE_UID,         winbindd_dual_allocate_uid,          "ALLOCATE_UID" },
 369         { WINBINDD_ALLOCATE_GID,         winbindd_dual_allocate_gid,          "ALLOCATE_GID" },
 370         { WINBINDD_GETUSERDOMGROUPS,     winbindd_dual_getuserdomgroups,      "GETUSERDOMGROUPS" },
 371         { WINBINDD_DUAL_GETSIDALIASES,   winbindd_dual_getsidaliases,         "GETSIDALIASES" },
 372         /* End of list */
 373
 374         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 375 };
 376
 377 static void child_process_request(struct winbindd_domain *domain,
 378                                   struct winbindd_cli_state *state)
 379 {
 380         struct winbindd_child_dispatch_table *table;
 381
 382         /* Free response data - we may be interrupted and receive another
 383            command before being able to send this data off. */
 384
 385         state->response.result = WINBINDD_ERROR;
 386         state->response.length = sizeof(struct winbindd_response);
 387
 388         state->mem_ctx = talloc_init("winbind request");
 389         if (state->mem_ctx == NULL)
 390                 return;
 391
 392         /* Process command */
 393
 394         for (table = child_dispatch_table; table->fn; table++) {
 395                 if (state->request.cmd == table->cmd) {
 396                         DEBUG(10,("process_request: request fn %s\n",
 397                                   table->winbindd_cmd_name ));
 398                         state->response.result = table->fn(domain, state);
 399                         break;
 400                 }
 401         }
 402
 403         if (!table->fn) {
 404                 DEBUG(10,("process_request: unknown request fn number %d\n",
 405                           (int)state->request.cmd ));
 406                 state->response.result = WINBINDD_ERROR;
 407         }
 408
 409         talloc_destroy(state->mem_ctx);
 410 }
 411
 412 void setup_domain_child(struct winbindd_domain *domain,
 413                         struct winbindd_child *child,
 414                         const char *explicit_logfile)
 415 {
 416         if (explicit_logfile != NULL) {
 417                 pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
 418                              dyn_LOGFILEBASE, explicit_logfile);
 419         } else if (domain != NULL) {
 420                 pstr_sprintf(child->logfilename, "%s/log.wb-%s",
 421                              dyn_LOGFILEBASE, domain->name);
 422         } else {
 423                 smb_panic("Internal error: domain == NULL && "
 424                           "explicit_logfile == NULL");
 425         }
 426
 427         child->domain = domain;
 428 }
 429
 430 struct winbindd_child *children = NULL;
 431
 432 void winbind_child_died(pid_t pid)
 433 {
 434         struct winbindd_child *child;
 435
 436         for (child = children; child != NULL; child = child->next) {
 437                 if (child->pid == pid) {
 438                         break;
 439                 }
 440         }
 441
 442         if (child == NULL) {
 443                 DEBUG(0, ("Unknown child %d died!\n", pid));
 444                 return;
 445         }
 446
 447         remove_fd_event(&child->event);
 448         close(child->event.fd);
 449         child->event.fd = 0;
 450         child->event.flags = 0;
 451         child->pid = 0;
 452
 453         schedule_async_request(child);
 454 }
 455
 456 /* Forward the online/offline messages to our children. */
 457 void winbind_msg_offline(int msg_type, struct process_id src, void *buf, size_t len)
 458 {
 459         struct winbindd_child *child;
 460
 461         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 462
 463         if (!lp_winbind_offline_logon()) {
 464                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 465                 return;
 466         }
 467
 468         /* Set our global state as offline. */
 469         if (!set_global_winbindd_state_offline()) {
 470                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 471                 return;
 472         }
 473
 474         for (child = children; child != NULL; child = child->next) {
 475                 DEBUG(10,("winbind_msg_offline: sending message to pid %u.\n",
 476                         (unsigned int)child->pid ));
 477                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_OFFLINE, NULL, 0, False);
 478         }
 479 }
 480
 481 /* Forward the online/offline messages to our children. */
 482 void winbind_msg_online(int msg_type, struct process_id src, void *buf, size_t len)
 483 {
 484         struct winbindd_child *child;
 485
 486         DEBUG(10,("winbind_msg_online: got online message.\n"));
 487
 488         if (!lp_winbind_offline_logon()) {
 489                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 490                 return;
 491         }
 492
 493         /* Set our global state as online. */
 494         set_global_winbindd_state_online();
 495
 496         for (child = children; child != NULL; child = child->next) {
 497                 DEBUG(10,("winbind_msg_online: sending message to pid %u.\n",
 498                         (unsigned int)child->pid ));
 499                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_ONLINE, NULL, 0, False);
 500         }
 501 }
 502
 503 /* Forward the online/offline messages to our children. */
 504 void winbind_msg_onlinestatus(int msg_type, struct process_id src, void *buf, size_t len)
 505 {
 506         struct winbindd_child *child;
 507
 508         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 509
 510         for (child = children; child != NULL; child = child->next) {
 511                 if (child->domain && child->domain->primary) {
 512                         DEBUG(10,("winbind_msg_onlinestatus: "
 513                                   "sending message to pid %u of primary domain.\n",
 514                                   (unsigned int)child->pid));
 515                         message_send_pid(pid_to_procid(child->pid),
 516                                          MSG_WINBIND_ONLINESTATUS, buf, len, False);
 517                         break;
 518                 }
 519         }
 520 }
 521
 522
 523 static void account_lockout_policy_handler(struct timed_event *te,
 524                                            const struct timeval *now,
 525                                            void *private_data)
 526 {
 527         struct winbindd_child *child = private_data;
 528
 529         struct winbindd_methods *methods;
 530         SAM_UNK_INFO_12 lockout_policy;
 531         NTSTATUS result;
 532
 533         DEBUG(10,("account_lockout_policy_handler called\n"));
 534
 535         if (child->lockout_policy_event) {
 536                 TALLOC_FREE(child->lockout_policy_event);
 537         }
 538
 539         methods = child->domain->methods;
 540
 541         result = methods->lockout_policy(child->domain, child->mem_ctx, &lockout_policy);
 542         if (!NT_STATUS_IS_OK(result)) {
 543                 DEBUG(10,("account_lockout_policy_handler: failed to call lockout_policy\n"));
 544                 return;
 545         }
 546
 547         child->lockout_policy_event = add_timed_event(child->mem_ctx,
 548                                                       timeval_current_ofs(3600, 0),
 549                                                       "account_lockout_policy_handler",
 550                                                       account_lockout_policy_handler,
 551                                                       child);
 552 }
 553
 554 /* Deal with a request to go offline. */
 555
 556 static void child_msg_offline(int msg_type, struct process_id src, void *buf, size_t len)
 557 {
 558         struct winbindd_domain *domain;
 559
 560         DEBUG(5,("child_msg_offline received.\n"));
 561
 562         if (!lp_winbind_offline_logon()) {
 563                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 564                 return;
 565         }
 566
 567         /* Set our global state as offline. */
 568         if (!set_global_winbindd_state_offline()) {
 569                 DEBUG(10,("child_msg_offline: offline request failed.\n"));
 570                 return;
 571         }
 572
 573         /* Mark all our domains as offline. */
 574
 575         for (domain = domain_list(); domain; domain = domain->next) {
 576                 DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 577                 domain->online = False;
 578         }
 579 }
 580
 581 /* Deal with a request to go online. */
 582
 583 static void child_msg_online(int msg_type, struct process_id src, void *buf, size_t len)
 584 {
 585         struct winbindd_domain *domain;
 586
 587         DEBUG(5,("child_msg_online received.\n"));
 588
 589         if (!lp_winbind_offline_logon()) {
 590                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 591                 return;
 592         }
 593
 594         /* Set our global state as online. */
 595         set_global_winbindd_state_online();
 596
 597         winbindd_flush_nscd_cache();
 598
 599         /* Mark everything online - delete any negative cache entries
 600            to force an immediate reconnect. */
 601
 602         for (domain = domain_list(); domain; domain = domain->next) {
 603                 DEBUG(5,("child_msg_online: marking %s online.\n", domain->name));
 604                 domain->online = True;
 605                 check_negative_conn_cache_timeout(domain->name, domain->dcname, 0);
 606         }
 607 }
 608
 609 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 610 {
 611         struct winbindd_domain *domain;
 612         char *buf = NULL;
 613
 614         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 615                                    get_global_winbindd_state_online() ?
 616                                    "Offline":"Online")) == NULL) {
 617                 return NULL;
 618         }
 619
 620         for (domain = domain_list(); domain; domain = domain->next) {
 621                 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
 622                                                   domain->name,
 623                                                   domain->online ?
 624                                                   "Online":"Offline")) == NULL) {
 625                         return NULL;
 626                 }
 627         }
 628
 629         buf = talloc_asprintf_append(buf, "\n");
 630
 631         DEBUG(5,("collect_onlinestatus: %s", buf));
 632
 633         return buf;
 634 }
 635
 636 static void child_msg_onlinestatus(int msg_type, struct process_id src, void *buf, size_t len)
 637 {
 638         TALLOC_CTX *mem_ctx;
 639         const char *message;
 640         struct process_id *sender;
 641
 642         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 643
 644         if (!buf) {
 645                 return;
 646         }
 647
 648         sender = (struct process_id *)buf;
 649
 650         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 651         if (mem_ctx == NULL) {
 652                 return;
 653         }
 654
 655         message = collect_onlinestatus(mem_ctx);
 656         if (message == NULL) {
 657                 talloc_destroy(mem_ctx);
 658                 return;
 659         }
 660
 661         message_send_pid(*sender, MSG_WINBIND_ONLINESTATUS,
 662                          message, strlen(message) + 1, True);
 663
 664         talloc_destroy(mem_ctx);
 665 }
 666
 667 static BOOL fork_domain_child(struct winbindd_child *child)
 668 {
 669         int fdpair[2];
 670         struct winbindd_cli_state state;
 671         extern BOOL override_logfile;
 672
 673         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 674                 DEBUG(0, ("Could not open child pipe: %s\n",
 675                           strerror(errno)));
 676                 return False;
 677         }
 678
 679         ZERO_STRUCT(state);
 680         state.pid = getpid();
 681
 682         /* Ensure we don't process messages whilst we're
 683            changing the disposition for the child. */
 684         message_block();
 685
 686         child->pid = sys_fork();
 687
 688         if (child->pid == -1) {
 689                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 690                 message_unblock();
 691                 return False;
 692         }
 693
 694         if (child->pid != 0) {
 695                 /* Parent */
 696                 close(fdpair[0]);
 697                 child->next = child->prev = NULL;
 698                 DLIST_ADD(children, child);
 699                 child->event.fd = fdpair[1];
 700                 child->event.flags = 0;
 701                 child->requests = NULL;
 702                 add_fd_event(&child->event);
 703                 /* We're ok with online/offline messages now. */
 704                 message_unblock();
 705                 return True;
 706         }
 707
 708         /* Child */
 709
 710         state.sock = fdpair[0];
 711         close(fdpair[1]);
 712
 713         /* tdb needs special fork handling */
 714         if (tdb_reopen_all(1) == -1) {
 715                 DEBUG(0,("tdb_reopen_all failed.\n"));
 716                 _exit(0);
 717         }
 718
 719         close_conns_after_fork();
 720
 721         if (!override_logfile) {
 722                 lp_set_logfile(child->logfilename);
 723                 reopen_logs();
 724         }
 725
 726         /* Don't handle the same messages as our parent. */
 727         message_deregister(MSG_SMB_CONF_UPDATED);
 728         message_deregister(MSG_SHUTDOWN);
 729         message_deregister(MSG_WINBIND_OFFLINE);
 730         message_deregister(MSG_WINBIND_ONLINE);
 731         message_deregister(MSG_WINBIND_ONLINESTATUS);
 732
 733         /* The child is ok with online/offline messages now. */
 734         message_unblock();
 735
 736         child->mem_ctx = talloc_init("child_mem_ctx");
 737         if (child->mem_ctx == NULL) {
 738                 return False;
 739         }
 740
 741         if (child->domain != NULL && lp_winbind_offline_logon()) {
 742                 /* We might be in the idmap child...*/
 743                 child->lockout_policy_event = add_timed_event(
 744                         child->mem_ctx, timeval_zero(),
 745                         "account_lockout_policy_handler",
 746                         account_lockout_policy_handler,
 747                         child);
 748         }
 749
 750         /* Handle online/offline messages. */
 751         message_register(MSG_WINBIND_OFFLINE,child_msg_offline);
 752         message_register(MSG_WINBIND_ONLINE,child_msg_online);
 753         message_register(MSG_WINBIND_ONLINESTATUS,child_msg_onlinestatus);
 754
 755         while (1) {
 756
 757                 int ret;
 758                 fd_set read_fds;
 759                 struct timeval t;
 760                 struct timeval *tp;
 761                 struct timeval now;
 762
 763                 /* free up any talloc memory */
 764                 lp_TALLOC_FREE();
 765                 main_loop_TALLOC_FREE();
 766
 767                 run_events();
 768
 769                 GetTimeOfDay(&now);
 770
 771                 tp = get_timed_events_timeout(&t);
 772                 if (tp) {
 773                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
 774                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
 775                 }
 776
 777                 /* Handle messages */
 778
 779                 message_dispatch();
 780
 781                 FD_ZERO(&read_fds);
 782                 FD_SET(state.sock, &read_fds);
 783
 784                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
 785
 786                 if (ret == 0) {
 787                         DEBUG(11,("nothing is ready yet, continue\n"));
 788                         continue;
 789                 }
 790
 791                 if (ret == -1 && errno == EINTR) {
 792                         /* We got a signal - continue. */
 793                         continue;
 794                 }
 795
 796                 if (ret == -1 && errno != EINTR) {
 797                         DEBUG(0,("select error occured\n"));
 798                         perror("select");
 799                         return False;
 800                 }
 801
 802                 /* fetch a request from the main daemon */
 803                 child_read_request(&state);
 804
 805                 if (state.finished) {
 806                         /* we lost contact with our parent */
 807                         exit(0);
 808                 }
 809
 810                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
 811
 812                 ZERO_STRUCT(state.response);
 813                 state.request.null_term = '\0';
 814                 child_process_request(child->domain, &state);
 815
 816                 SAFE_FREE(state.request.extra_data.data);
 817
 818                 cache_store_response(sys_getpid(), &state.response);
 819
 820                 SAFE_FREE(state.response.extra_data.data);
 821
 822                 /* We just send the result code back, the result
 823                  * structure needs to be fetched via the
 824                  * winbindd_cache. Hmm. That needs fixing... */
 825
 826                 if (write_data(state.sock, (void *)&state.response.result,
 827                                sizeof(state.response.result)) !=
 828                     sizeof(state.response.result)) {
 829                         DEBUG(0, ("Could not write result\n"));
 830                         exit(1);
 831                 }
 832         }
 833 }