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(len > 0 ? 0 : 3, ("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;
 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, struct winbindd_async_request *);
 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         { WINBINDD_CCACHE_NTLMAUTH,      winbindd_dual_ccache_ntlm_auth,      "CCACHE_NTLM_AUTH" },
 373         /* End of list */
 374
 375         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 376 };
 377
 378 static void child_process_request(struct winbindd_domain *domain,
 379                                   struct winbindd_cli_state *state)
 380 {
 381         struct winbindd_child_dispatch_table *table;
 382
 383         /* Free response data - we may be interrupted and receive another
 384            command before being able to send this data off. */
 385
 386         state->response.result = WINBINDD_ERROR;
 387         state->response.length = sizeof(struct winbindd_response);
 388
 389         state->mem_ctx = talloc_init("winbind request");
 390         if (state->mem_ctx == NULL)
 391                 return;
 392
 393         /* Process command */
 394
 395         for (table = child_dispatch_table; table->fn; table++) {
 396                 if (state->request.cmd == table->cmd) {
 397                         DEBUG(10,("process_request: request fn %s\n",
 398                                   table->winbindd_cmd_name ));
 399                         state->response.result = table->fn(domain, state);
 400                         break;
 401                 }
 402         }
 403
 404         if (!table->fn) {
 405                 DEBUG(10,("process_request: unknown request fn number %d\n",
 406                           (int)state->request.cmd ));
 407                 state->response.result = WINBINDD_ERROR;
 408         }
 409
 410         talloc_destroy(state->mem_ctx);
 411 }
 412
 413 void setup_domain_child(struct winbindd_domain *domain,
 414                         struct winbindd_child *child,
 415                         const char *explicit_logfile)
 416 {
 417         if (explicit_logfile != NULL) {
 418                 pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
 419                              dyn_LOGFILEBASE, explicit_logfile);
 420         } else if (domain != NULL) {
 421                 pstr_sprintf(child->logfilename, "%s/log.wb-%s",
 422                              dyn_LOGFILEBASE, domain->name);
 423         } else {
 424                 smb_panic("Internal error: domain == NULL && "
 425                           "explicit_logfile == NULL");
 426         }
 427
 428         child->domain = domain;
 429 }
 430
 431 struct winbindd_child *children = NULL;
 432
 433 void winbind_child_died(pid_t pid)
 434 {
 435         struct winbindd_child *child;
 436
 437         for (child = children; child != NULL; child = child->next) {
 438                 if (child->pid == pid) {
 439                         break;
 440                 }
 441         }
 442
 443         if (child == NULL) {
 444                 DEBUG(0, ("Unknown child %d died!\n", pid));
 445                 return;
 446         }
 447
 448         remove_fd_event(&child->event);
 449         close(child->event.fd);
 450         child->event.fd = 0;
 451         child->event.flags = 0;
 452         child->pid = 0;
 453
 454         schedule_async_request(child);
 455 }
 456
 457 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 458
 459 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 460 {
 461         flush_negative_conn_cache_for_domain(domain->name);
 462         if (*domain->alt_name) {
 463                 flush_negative_conn_cache_for_domain(domain->alt_name);
 464         }
 465 }
 466
 467 /* Set our domains as offline and forward the offline message to our children. */
 468
 469 void winbind_msg_offline(int msg_type, struct process_id src, void *buf, size_t len)
 470 {
 471         struct winbindd_child *child;
 472         struct winbindd_domain *domain;
 473
 474         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 475
 476         if (!lp_winbind_offline_logon()) {
 477                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 478                 return;
 479         }
 480
 481         /* Set our global state as offline. */
 482         if (!set_global_winbindd_state_offline()) {
 483                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 484                 return;
 485         }
 486
 487         /* Set all our domains as offline. */
 488         for (domain = domain_list(); domain; domain = domain->next) {
 489                 if (domain->internal) {
 490                         continue;
 491                 }
 492                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 493                 set_domain_offline(domain);
 494         }
 495
 496         for (child = children; child != NULL; child = child->next) {
 497                 /* Don't send message to idmap child. */
 498                 if (!child->domain || (child == idmap_child())) {
 499                         continue;
 500                 }
 501
 502                 /* Or internal domains (this should not be possible....) */
 503                 if (child->domain->internal) {
 504                         continue;
 505                 }
 506
 507                 /* Each winbindd child should only process requests for one domain - make sure
 508                    we only set it online / offline for that domain. */
 509
 510                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 511                         (unsigned int)child->pid, domain->name ));
 512
 513                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_OFFLINE, domain->name,
 514                         strlen(domain->name)+1, False);
 515         }
 516 }
 517
 518 /* Set our domains as online and forward the online message to our children. */
 519
 520 void winbind_msg_online(int msg_type, struct process_id src, void *buf, size_t len)
 521 {
 522         struct winbindd_child *child;
 523         struct winbindd_domain *domain;
 524
 525         DEBUG(10,("winbind_msg_online: got online message.\n"));
 526
 527         if (!lp_winbind_offline_logon()) {
 528                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 529                 return;
 530         }
 531
 532         /* Set our global state as online. */
 533         set_global_winbindd_state_online();
 534
 535         smb_nscd_flush_user_cache();
 536         smb_nscd_flush_group_cache();
 537
 538         /* Set all our domains as online. */
 539         for (domain = domain_list(); domain; domain = domain->next) {
 540                 if (domain->internal) {
 541                         continue;
 542                 }
 543                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 544
 545                 winbindd_flush_negative_conn_cache(domain);
 546                 set_domain_online_request(domain);
 547         }
 548
 549         for (child = children; child != NULL; child = child->next) {
 550                 /* Don't send message to idmap child. */
 551                 if (!child->domain || (child == idmap_child())) {
 552                         continue;
 553                 }
 554
 555                 /* Or internal domains (this should not be possible....) */
 556                 if (child->domain->internal) {
 557                         continue;
 558                 }
 559
 560                 /* Each winbindd child should only process requests for one domain - make sure
 561                    we only set it online / offline for that domain. */
 562
 563                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 564                         (unsigned int)child->pid, domain->name ));
 565
 566                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_ONLINE, domain->name,
 567                         strlen(domain->name)+1, False);
 568         }
 569 }
 570
 571 /* Forward the online/offline messages to our children. */
 572 void winbind_msg_onlinestatus(int msg_type, struct process_id src, void *buf, size_t len)
 573 {
 574         struct winbindd_child *child;
 575
 576         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 577
 578         for (child = children; child != NULL; child = child->next) {
 579                 if (child->domain && child->domain->primary) {
 580                         DEBUG(10,("winbind_msg_onlinestatus: "
 581                                   "sending message to pid %u of primary domain.\n",
 582                                   (unsigned int)child->pid));
 583                         message_send_pid(pid_to_procid(child->pid),
 584                                          MSG_WINBIND_ONLINESTATUS, buf, len, False);
 585                         break;
 586                 }
 587         }
 588 }
 589
 590
 591 static void account_lockout_policy_handler(struct timed_event *te,
 592                                            const struct timeval *now,
 593                                            void *private_data)
 594 {
 595         struct winbindd_child *child =
 596                 (struct winbindd_child *)private_data;
 597
 598         struct winbindd_methods *methods;
 599         SAM_UNK_INFO_12 lockout_policy;
 600         NTSTATUS result;
 601
 602         DEBUG(10,("account_lockout_policy_handler called\n"));
 603
 604         if (child->lockout_policy_event) {
 605                 TALLOC_FREE(child->lockout_policy_event);
 606         }
 607
 608         methods = child->domain->methods;
 609
 610         result = methods->lockout_policy(child->domain, child->mem_ctx, &lockout_policy);
 611         if (!NT_STATUS_IS_OK(result)) {
 612                 DEBUG(10,("account_lockout_policy_handler: failed to call lockout_policy\n"));
 613                 return;
 614         }
 615
 616         child->lockout_policy_event = add_timed_event(child->mem_ctx,
 617                                                       timeval_current_ofs(3600, 0),
 618                                                       "account_lockout_policy_handler",
 619                                                       account_lockout_policy_handler,
 620                                                       child);
 621 }
 622
 623 /* Deal with a request to go offline. */
 624
 625 static void child_msg_offline(int msg_type, struct process_id src, void *buf, size_t len)
 626 {
 627         struct winbindd_domain *domain;
 628         const char *domainname = (const char *)buf;
 629
 630         if (buf == NULL || len == 0) {
 631                 return;
 632         }
 633
 634         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 635
 636         if (!lp_winbind_offline_logon()) {
 637                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 638                 return;
 639         }
 640
 641         /* Set our global state as offline. */
 642         if (!set_global_winbindd_state_offline()) {
 643                 DEBUG(10,("child_msg_offline: offline request failed.\n"));
 644                 return;
 645         }
 646
 647         /* Mark the requested domain offline. */
 648
 649         for (domain = domain_list(); domain; domain = domain->next) {
 650                 if (domain->internal) {
 651                         continue;
 652                 }
 653                 if (strequal(domain->name, domainname)) {
 654                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 655                         set_domain_offline(domain);
 656                 }
 657         }
 658 }
 659
 660 /* Deal with a request to go online. */
 661
 662 static void child_msg_online(int msg_type, struct process_id src, void *buf, size_t len)
 663 {
 664         struct winbindd_domain *domain;
 665         const char *domainname = (const char *)buf;
 666
 667         if (buf == NULL || len == 0) {
 668                 return;
 669         }
 670
 671         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 672
 673         if (!lp_winbind_offline_logon()) {
 674                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 675                 return;
 676         }
 677
 678         /* Set our global state as online. */
 679         set_global_winbindd_state_online();
 680
 681         /* Try and mark everything online - delete any negative cache entries
 682            to force a reconnect now. */
 683
 684         for (domain = domain_list(); domain; domain = domain->next) {
 685                 if (domain->internal) {
 686                         continue;
 687                 }
 688                 if (strequal(domain->name, domainname)) {
 689                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 690                         winbindd_flush_negative_conn_cache(domain);
 691                         set_domain_online_request(domain);
 692                 }
 693         }
 694 }
 695
 696 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 697 {
 698         struct winbindd_domain *domain;
 699         char *buf = NULL;
 700
 701         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 702                                    get_global_winbindd_state_offline() ?
 703                                    "Offline":"Online")) == NULL) {
 704                 return NULL;
 705         }
 706
 707         for (domain = domain_list(); domain; domain = domain->next) {
 708                 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
 709                                                   domain->name,
 710                                                   domain->online ?
 711                                                   "Online":"Offline")) == NULL) {
 712                         return NULL;
 713                 }
 714         }
 715
 716         buf = talloc_asprintf_append(buf, "\n");
 717
 718         DEBUG(5,("collect_onlinestatus: %s", buf));
 719
 720         return buf;
 721 }
 722
 723 static void child_msg_onlinestatus(int msg_type, struct process_id src, void *buf, size_t len)
 724 {
 725         TALLOC_CTX *mem_ctx;
 726         const char *message;
 727         struct process_id *sender;
 728
 729         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 730
 731         if (!buf) {
 732                 return;
 733         }
 734
 735         sender = (struct process_id *)buf;
 736
 737         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 738         if (mem_ctx == NULL) {
 739                 return;
 740         }
 741
 742         message = collect_onlinestatus(mem_ctx);
 743         if (message == NULL) {
 744                 talloc_destroy(mem_ctx);
 745                 return;
 746         }
 747
 748         message_send_pid(*sender, MSG_WINBIND_ONLINESTATUS,
 749                          message, strlen(message) + 1, True);
 750
 751         talloc_destroy(mem_ctx);
 752 }
 753
 754 static BOOL fork_domain_child(struct winbindd_child *child)
 755 {
 756         int fdpair[2];
 757         struct winbindd_cli_state state;
 758         extern BOOL override_logfile;
 759
 760         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 761                 DEBUG(0, ("Could not open child pipe: %s\n",
 762                           strerror(errno)));
 763                 return False;
 764         }
 765
 766         ZERO_STRUCT(state);
 767         state.pid = getpid();
 768
 769         /* Ensure we don't process messages whilst we're
 770            changing the disposition for the child. */
 771         message_block();
 772
 773         child->pid = sys_fork();
 774
 775         if (child->pid == -1) {
 776                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 777                 message_unblock();
 778                 return False;
 779         }
 780
 781         if (child->pid != 0) {
 782                 /* Parent */
 783                 close(fdpair[0]);
 784                 child->next = child->prev = NULL;
 785                 DLIST_ADD(children, child);
 786                 child->event.fd = fdpair[1];
 787                 child->event.flags = 0;
 788                 child->requests = NULL;
 789                 add_fd_event(&child->event);
 790                 /* We're ok with online/offline messages now. */
 791                 message_unblock();
 792                 return True;
 793         }
 794
 795         /* Child */
 796
 797         state.sock = fdpair[0];
 798         close(fdpair[1]);
 799
 800         /* tdb needs special fork handling */
 801         if (tdb_reopen_all(1) == -1) {
 802                 DEBUG(0,("tdb_reopen_all failed.\n"));
 803                 _exit(0);
 804         }
 805
 806         close_conns_after_fork();
 807
 808         if (!override_logfile) {
 809                 lp_set_logfile(child->logfilename);
 810                 reopen_logs();
 811         }
 812
 813         /* Don't handle the same messages as our parent. */
 814         message_deregister(MSG_SMB_CONF_UPDATED);
 815         message_deregister(MSG_SHUTDOWN);
 816         message_deregister(MSG_WINBIND_OFFLINE);
 817         message_deregister(MSG_WINBIND_ONLINE);
 818         message_deregister(MSG_WINBIND_ONLINESTATUS);
 819
 820         /* The child is ok with online/offline messages now. */
 821         message_unblock();
 822
 823         child->mem_ctx = talloc_init("child_mem_ctx");
 824         if (child->mem_ctx == NULL) {
 825                 return False;
 826         }
 827
 828         if (child->domain != NULL && lp_winbind_offline_logon()) {
 829                 /* We might be in the idmap child...*/
 830                 child->lockout_policy_event = add_timed_event(
 831                         child->mem_ctx, timeval_zero(),
 832                         "account_lockout_policy_handler",
 833                         account_lockout_policy_handler,
 834                         child);
 835         }
 836
 837         /* Handle online/offline messages. */
 838         message_register(MSG_WINBIND_OFFLINE,child_msg_offline);
 839         message_register(MSG_WINBIND_ONLINE,child_msg_online);
 840         message_register(MSG_WINBIND_ONLINESTATUS,child_msg_onlinestatus);
 841
 842         if ( child->domain ) {
 843                 child->domain->startup = True;
 844                 child->domain->startup_time = time(NULL);
 845         }
 846
 847         while (1) {
 848
 849                 int ret;
 850                 fd_set read_fds;
 851                 struct timeval t;
 852                 struct timeval *tp;
 853                 struct timeval now;
 854
 855                 /* free up any talloc memory */
 856                 lp_TALLOC_FREE();
 857                 main_loop_TALLOC_FREE();
 858
 859                 run_events();
 860
 861                 GetTimeOfDay(&now);
 862
 863                 if (child->domain && child->domain->startup &&
 864                                 (now.tv_sec > child->domain->startup_time + 30)) {
 865                         /* No longer in "startup" mode. */
 866                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
 867                                 child->domain->name ));
 868                         child->domain->startup = False;
 869                 }
 870
 871                 tp = get_timed_events_timeout(&t);
 872                 if (tp) {
 873                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
 874                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
 875                 }
 876
 877                 /* Handle messages */
 878
 879                 message_dispatch();
 880
 881                 FD_ZERO(&read_fds);
 882                 FD_SET(state.sock, &read_fds);
 883
 884                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
 885
 886                 if (ret == 0) {
 887                         DEBUG(11,("nothing is ready yet, continue\n"));
 888                         continue;
 889                 }
 890
 891                 if (ret == -1 && errno == EINTR) {
 892                         /* We got a signal - continue. */
 893                         continue;
 894                 }
 895
 896                 if (ret == -1 && errno != EINTR) {
 897                         DEBUG(0,("select error occured\n"));
 898                         perror("select");
 899                         return False;
 900                 }
 901
 902                 /* fetch a request from the main daemon */
 903                 child_read_request(&state);
 904
 905                 if (state.finished) {
 906                         /* we lost contact with our parent */
 907                         exit(0);
 908                 }
 909
 910                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
 911
 912                 ZERO_STRUCT(state.response);
 913                 state.request.null_term = '\0';
 914                 child_process_request(child->domain, &state);
 915
 916                 SAFE_FREE(state.request.extra_data.data);
 917
 918                 cache_store_response(sys_getpid(), &state.response);
 919
 920                 SAFE_FREE(state.response.extra_data.data);
 921
 922                 /* We just send the result code back, the result
 923                  * structure needs to be fetched via the
 924                  * winbindd_cache. Hmm. That needs fixing... */
 925
 926                 if (write_data(state.sock,
 927                                (const char *)&state.response.result,
 928                                sizeof(state.response.result)) !=
 929                     sizeof(state.response.result)) {
 930                         DEBUG(0, ("Could not write result\n"));
 931                         exit(1);
 932                 }
 933         }
 934 }