source3/nsswitch/winbindd_dual.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Winbind child daemons
   5
   6    Copyright (C) Andrew Tridgell 2002
   7    Copyright (C) Volker Lendecke 2004,2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 /*
  25  * We fork a child per domain to be able to act non-blocking in the main
  26  * winbind daemon. A domain controller thousands of miles away being being
  27  * slow replying with a 10.000 user list should not hold up netlogon calls
  28  * that can be handled locally.
  29  */
  30
  31 #include "includes.h"
  32 #include "winbindd.h"
  33
  34 #undef DBGC_CLASS
  35 #define DBGC_CLASS DBGC_WINBIND
  36
  37 extern BOOL override_logfile;
  38
  39 /* Read some data from a client connection */
  40
  41 static void child_read_request(struct winbindd_cli_state *state)
  42 {
  43         ssize_t len;
  44
  45         /* Read data */
  46
  47         len = read_data(state->sock, (char *)&state->request,
  48                         sizeof(state->request));
  49
  50         if (len != sizeof(state->request)) {
  51                 DEBUG(len > 0 ? 0 : 3, ("Got invalid request length: %d\n", (int)len));
  52                 state->finished = True;
  53                 return;
  54         }
  55
  56         if (state->request.extra_len == 0) {
  57                 state->request.extra_data.data = NULL;
  58                 return;
  59         }
  60
  61         DEBUG(10, ("Need to read %d extra bytes\n", (int)state->request.extra_len));
  62
  63         state->request.extra_data.data =
  64                 SMB_MALLOC_ARRAY(char, state->request.extra_len + 1);
  65
  66         if (state->request.extra_data.data == NULL) {
  67                 DEBUG(0, ("malloc failed\n"));
  68                 state->finished = True;
  69                 return;
  70         }
  71
  72         /* Ensure null termination */
  73         state->request.extra_data.data[state->request.extra_len] = '\0';
  74
  75         len = read_data(state->sock, state->request.extra_data.data,
  76                         state->request.extra_len);
  77
  78         if (len != state->request.extra_len) {
  79                 DEBUG(0, ("Could not read extra data\n"));
  80                 state->finished = True;
  81                 return;
  82         }
  83 }
  84
  85 /*
  86  * Machinery for async requests sent to children. You set up a
  87  * winbindd_request, select a child to query, and issue a async_request
  88  * call. When the request is completed, the callback function you specified is
  89  * called back with the private pointer you gave to async_request.
  90  */
  91
  92 struct winbindd_async_request {
  93         struct winbindd_async_request *next, *prev;
  94         TALLOC_CTX *mem_ctx;
  95         struct winbindd_child *child;
  96         struct winbindd_request *request;
  97         struct winbindd_response *response;
  98         void (*continuation)(void *private_data, BOOL success);
  99         void *private_data;
 100 };
 101
 102 static void async_main_request_sent(void *private_data, BOOL success);
 103 static void async_request_sent(void *private_data, BOOL success);
 104 static void async_reply_recv(void *private_data, BOOL success);
 105 static void schedule_async_request(struct winbindd_child *child);
 106
 107 void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
 108                    struct winbindd_request *request,
 109                    struct winbindd_response *response,
 110                    void (*continuation)(void *private_data, BOOL success),
 111                    void *private_data)
 112 {
 113         struct winbindd_async_request *state;
 114
 115         SMB_ASSERT(continuation != NULL);
 116
 117         state = TALLOC_P(mem_ctx, struct winbindd_async_request);
 118
 119         if (state == NULL) {
 120                 DEBUG(0, ("talloc failed\n"));
 121                 continuation(private_data, False);
 122                 return;
 123         }
 124
 125         state->mem_ctx = mem_ctx;
 126         state->child = child;
 127         state->request = request;
 128         state->response = response;
 129         state->continuation = continuation;
 130         state->private_data = private_data;
 131
 132         DLIST_ADD_END(child->requests, state, struct winbindd_async_request *);
 133
 134         schedule_async_request(child);
 135
 136         return;
 137 }
 138
 139 static void async_main_request_sent(void *private_data, BOOL success)
 140 {
 141         struct winbindd_async_request *state =
 142                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 143
 144         if (!success) {
 145                 DEBUG(5, ("Could not send async request\n"));
 146
 147                 state->response->length = sizeof(struct winbindd_response);
 148                 state->response->result = WINBINDD_ERROR;
 149                 state->continuation(state->private_data, False);
 150                 return;
 151         }
 152
 153         if (state->request->extra_len == 0) {
 154                 async_request_sent(private_data, True);
 155                 return;
 156         }
 157
 158         setup_async_write(&state->child->event, state->request->extra_data.data,
 159                           state->request->extra_len,
 160                           async_request_sent, state);
 161 }
 162
 163 static void async_request_sent(void *private_data_data, BOOL success)
 164 {
 165         struct winbindd_async_request *state =
 166                 talloc_get_type_abort(private_data_data, struct winbindd_async_request);
 167
 168         if (!success) {
 169                 DEBUG(5, ("Could not send async request\n"));
 170
 171                 state->response->length = sizeof(struct winbindd_response);
 172                 state->response->result = WINBINDD_ERROR;
 173                 state->continuation(state->private_data, False);
 174                 return;
 175         }
 176
 177         /* Request successfully sent to the child, setup the wait for reply */
 178
 179         setup_async_read(&state->child->event,
 180                          &state->response->result,
 181                          sizeof(state->response->result),
 182                          async_reply_recv, state);
 183 }
 184
 185 static void async_reply_recv(void *private_data, BOOL success)
 186 {
 187         struct winbindd_async_request *state =
 188                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 189         struct winbindd_child *child = state->child;
 190
 191         state->response->length = sizeof(struct winbindd_response);
 192
 193         if (!success) {
 194                 DEBUG(5, ("Could not receive async reply\n"));
 195
 196                 cache_cleanup_response(child->pid);
 197                 DLIST_REMOVE(child->requests, state);
 198
 199                 state->response->result = WINBINDD_ERROR;
 200                 state->continuation(state->private_data, False);
 201                 return;
 202         }
 203
 204         SMB_ASSERT(cache_retrieve_response(child->pid,
 205                                            state->response));
 206
 207         cache_cleanup_response(child->pid);
 208
 209         DLIST_REMOVE(child->requests, state);
 210
 211         schedule_async_request(child);
 212
 213         state->continuation(state->private_data, True);
 214 }
 215
 216 static BOOL fork_domain_child(struct winbindd_child *child);
 217
 218 static void schedule_async_request(struct winbindd_child *child)
 219 {
 220         struct winbindd_async_request *request = child->requests;
 221
 222         if (request == NULL) {
 223                 return;
 224         }
 225
 226         if (child->event.flags != 0) {
 227                 return;         /* Busy */
 228         }
 229
 230         if ((child->pid == 0) && (!fork_domain_child(child))) {
 231                 /* Cancel all outstanding requests */
 232
 233                 while (request != NULL) {
 234                         /* request might be free'd in the continuation */
 235                         struct winbindd_async_request *next = request->next;
 236                         request->continuation(request->private_data, False);
 237                         request = next;
 238                 }
 239                 return;
 240         }
 241
 242         setup_async_write(&child->event, request->request,
 243                           sizeof(*request->request),
 244                           async_main_request_sent, request);
 245
 246         return;
 247 }
 248
 249 struct domain_request_state {
 250         TALLOC_CTX *mem_ctx;
 251         struct winbindd_domain *domain;
 252         struct winbindd_request *request;
 253         struct winbindd_response *response;
 254         void (*continuation)(void *private_data_data, BOOL success);
 255         void *private_data_data;
 256 };
 257
 258 static void domain_init_recv(void *private_data_data, BOOL success);
 259
 260 void async_domain_request(TALLOC_CTX *mem_ctx,
 261                           struct winbindd_domain *domain,
 262                           struct winbindd_request *request,
 263                           struct winbindd_response *response,
 264                           void (*continuation)(void *private_data_data, BOOL success),
 265                           void *private_data_data)
 266 {
 267         struct domain_request_state *state;
 268
 269         if (domain->initialized) {
 270                 async_request(mem_ctx, &domain->child, request, response,
 271                               continuation, private_data_data);
 272                 return;
 273         }
 274
 275         state = TALLOC_P(mem_ctx, struct domain_request_state);
 276         if (state == NULL) {
 277                 DEBUG(0, ("talloc failed\n"));
 278                 continuation(private_data_data, False);
 279                 return;
 280         }
 281
 282         state->mem_ctx = mem_ctx;
 283         state->domain = domain;
 284         state->request = request;
 285         state->response = response;
 286         state->continuation = continuation;
 287         state->private_data_data = private_data_data;
 288
 289         init_child_connection(domain, domain_init_recv, state);
 290 }
 291
 292 static void recvfrom_child(void *private_data_data, BOOL success)
 293 {
 294         struct winbindd_cli_state *state =
 295                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 296         enum winbindd_result result = state->response.result;
 297
 298         /* This is an optimization: The child has written directly to the
 299          * response buffer. The request itself is still in pending state,
 300          * state that in the result code. */
 301
 302         state->response.result = WINBINDD_PENDING;
 303
 304         if ((!success) || (result != WINBINDD_OK)) {
 305                 request_error(state);
 306                 return;
 307         }
 308
 309         request_ok(state);
 310 }
 311
 312 void sendto_child(struct winbindd_cli_state *state,
 313                   struct winbindd_child *child)
 314 {
 315         async_request(state->mem_ctx, child, &state->request,
 316                       &state->response, recvfrom_child, state);
 317 }
 318
 319 void sendto_domain(struct winbindd_cli_state *state,
 320                    struct winbindd_domain *domain)
 321 {
 322         async_domain_request(state->mem_ctx, domain,
 323                              &state->request, &state->response,
 324                              recvfrom_child, state);
 325 }
 326
 327 static void domain_init_recv(void *private_data_data, BOOL success)
 328 {
 329         struct domain_request_state *state =
 330                 talloc_get_type_abort(private_data_data, struct domain_request_state);
 331
 332         if (!success) {
 333                 DEBUG(5, ("Domain init returned an error\n"));
 334                 state->continuation(state->private_data_data, False);
 335                 return;
 336         }
 337
 338         async_request(state->mem_ctx, &state->domain->child,
 339                       state->request, state->response,
 340                       state->continuation, state->private_data_data);
 341 }
 342
 343 struct winbindd_child_dispatch_table {
 344         enum winbindd_cmd cmd;
 345         enum winbindd_result (*fn)(struct winbindd_domain *domain,
 346                                    struct winbindd_cli_state *state);
 347         const char *winbindd_cmd_name;
 348 };
 349
 350 static struct winbindd_child_dispatch_table child_dispatch_table[] = {
 351
 352         { WINBINDD_LOOKUPSID,            winbindd_dual_lookupsid,             "LOOKUPSID" },
 353         { WINBINDD_LOOKUPNAME,           winbindd_dual_lookupname,            "LOOKUPNAME" },
 354         { WINBINDD_LOOKUPRIDS,           winbindd_dual_lookuprids,            "LOOKUPRIDS" },
 355         { WINBINDD_LIST_TRUSTDOM,        winbindd_dual_list_trusted_domains,  "LIST_TRUSTDOM" },
 356         { WINBINDD_INIT_CONNECTION,      winbindd_dual_init_connection,       "INIT_CONNECTION" },
 357         { WINBINDD_GETDCNAME,            winbindd_dual_getdcname,             "GETDCNAME" },
 358         { WINBINDD_SHOW_SEQUENCE,        winbindd_dual_show_sequence,         "SHOW_SEQUENCE" },
 359         { WINBINDD_PAM_AUTH,             winbindd_dual_pam_auth,              "PAM_AUTH" },
 360         { WINBINDD_PAM_AUTH_CRAP,        winbindd_dual_pam_auth_crap,         "AUTH_CRAP" },
 361         { WINBINDD_PAM_LOGOFF,           winbindd_dual_pam_logoff,            "PAM_LOGOFF" },
 362         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP,winbindd_dual_pam_chng_pswd_auth_crap,"CHNG_PSWD_AUTH_CRAP" },
 363         { WINBINDD_PAM_CHAUTHTOK,        winbindd_dual_pam_chauthtok,         "PAM_CHAUTHTOK" },
 364         { WINBINDD_CHECK_MACHACC,        winbindd_dual_check_machine_acct,    "CHECK_MACHACC" },
 365         { WINBINDD_DUAL_SID2UID,         winbindd_dual_sid2uid,               "DUAL_SID2UID" },
 366         { WINBINDD_DUAL_SID2GID,         winbindd_dual_sid2gid,               "DUAL_SID2GID" },
 367         { WINBINDD_DUAL_SIDS2XIDS,       winbindd_dual_sids2xids,             "DUAL_SIDS2XIDS" },
 368         { WINBINDD_DUAL_UID2SID,         winbindd_dual_uid2sid,               "DUAL_UID2SID" },
 369         { WINBINDD_DUAL_GID2SID,         winbindd_dual_gid2sid,               "DUAL_GID2SID" },
 370         { WINBINDD_DUAL_UID2NAME,        winbindd_dual_uid2name,              "DUAL_UID2NAME" },
 371         { WINBINDD_DUAL_NAME2UID,        winbindd_dual_name2uid,              "DUAL_NAME2UID" },
 372         { WINBINDD_DUAL_GID2NAME,        winbindd_dual_gid2name,              "DUAL_GID2NAME" },
 373         { WINBINDD_DUAL_NAME2GID,        winbindd_dual_name2gid,              "DUAL_NAME2GID" },
 374         { WINBINDD_DUAL_SET_MAPPING,     winbindd_dual_set_mapping,           "DUAL_SET_MAPPING" },
 375         { WINBINDD_DUAL_SET_HWM,         winbindd_dual_set_hwm,               "DUAL_SET_HWMS" },
 376         { WINBINDD_DUAL_DUMP_MAPS,       winbindd_dual_dump_maps,             "DUAL_DUMP_MAPS" },
 377         { WINBINDD_DUAL_USERINFO,        winbindd_dual_userinfo,              "DUAL_USERINFO" },
 378         { WINBINDD_ALLOCATE_UID,         winbindd_dual_allocate_uid,          "ALLOCATE_UID" },
 379         { WINBINDD_ALLOCATE_GID,         winbindd_dual_allocate_gid,          "ALLOCATE_GID" },
 380         { WINBINDD_GETUSERDOMGROUPS,     winbindd_dual_getuserdomgroups,      "GETUSERDOMGROUPS" },
 381         { WINBINDD_DUAL_GETSIDALIASES,   winbindd_dual_getsidaliases,         "GETSIDALIASES" },
 382         { WINBINDD_CCACHE_NTLMAUTH,      winbindd_dual_ccache_ntlm_auth,      "CCACHE_NTLM_AUTH" },
 383         /* End of list */
 384
 385         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 386 };
 387
 388 static void child_process_request(struct winbindd_domain *domain,
 389                                   struct winbindd_cli_state *state)
 390 {
 391         struct winbindd_child_dispatch_table *table;
 392
 393         /* Free response data - we may be interrupted and receive another
 394            command before being able to send this data off. */
 395
 396         state->response.result = WINBINDD_ERROR;
 397         state->response.length = sizeof(struct winbindd_response);
 398
 399         state->mem_ctx = talloc_init("winbind request");
 400         if (state->mem_ctx == NULL)
 401                 return;
 402
 403         /* Process command */
 404
 405         for (table = child_dispatch_table; table->fn; table++) {
 406                 if (state->request.cmd == table->cmd) {
 407                         DEBUG(10,("process_request: request fn %s\n",
 408                                   table->winbindd_cmd_name ));
 409                         state->response.result = table->fn(domain, state);
 410                         break;
 411                 }
 412         }
 413
 414         if (!table->fn) {
 415                 DEBUG(10,("process_request: unknown request fn number %d\n",
 416                           (int)state->request.cmd ));
 417                 state->response.result = WINBINDD_ERROR;
 418         }
 419
 420         talloc_destroy(state->mem_ctx);
 421 }
 422
 423 void setup_domain_child(struct winbindd_domain *domain,
 424                         struct winbindd_child *child,
 425                         const char *explicit_logfile)
 426 {
 427         if (explicit_logfile != NULL) {
 428                 pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
 429                              dyn_LOGFILEBASE, explicit_logfile);
 430         } else if (domain != NULL) {
 431                 pstr_sprintf(child->logfilename, "%s/log.wb-%s",
 432                              dyn_LOGFILEBASE, domain->name);
 433         } else {
 434                 smb_panic("Internal error: domain == NULL && "
 435                           "explicit_logfile == NULL");
 436         }
 437
 438         child->domain = domain;
 439 }
 440
 441 struct winbindd_child *children = NULL;
 442
 443 void winbind_child_died(pid_t pid)
 444 {
 445         struct winbindd_child *child;
 446
 447         for (child = children; child != NULL; child = child->next) {
 448                 if (child->pid == pid) {
 449                         break;
 450                 }
 451         }
 452
 453         if (child == NULL) {
 454                 DEBUG(0, ("Unknown child %d died!\n", pid));
 455                 return;
 456         }
 457
 458         remove_fd_event(&child->event);
 459         close(child->event.fd);
 460         child->event.fd = 0;
 461         child->event.flags = 0;
 462         child->pid = 0;
 463
 464         schedule_async_request(child);
 465 }
 466
 467 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 468
 469 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 470 {
 471         flush_negative_conn_cache_for_domain(domain->name);
 472         if (*domain->alt_name) {
 473                 flush_negative_conn_cache_for_domain(domain->alt_name);
 474         }
 475 }
 476
 477 /* Set our domains as offline and forward the offline message to our children. */
 478
 479 void winbind_msg_offline(int msg_type, struct process_id src,
 480                          void *buf, size_t len, void *private_data)
 481 {
 482         struct winbindd_child *child;
 483         struct winbindd_domain *domain;
 484
 485         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 486
 487         if (!lp_winbind_offline_logon()) {
 488                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 489                 return;
 490         }
 491
 492         /* Set our global state as offline. */
 493         if (!set_global_winbindd_state_offline()) {
 494                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 495                 return;
 496         }
 497
 498         /* Set all our domains as offline. */
 499         for (domain = domain_list(); domain; domain = domain->next) {
 500                 if (domain->internal) {
 501                         continue;
 502                 }
 503                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 504                 set_domain_offline(domain);
 505         }
 506
 507         for (child = children; child != NULL; child = child->next) {
 508                 /* Don't send message to idmap child. */
 509                 if (!child->domain || (child == idmap_child())) {
 510                         continue;
 511                 }
 512
 513                 /* Or internal domains (this should not be possible....) */
 514                 if (child->domain->internal) {
 515                         continue;
 516                 }
 517
 518                 /* Each winbindd child should only process requests for one domain - make sure
 519                    we only set it online / offline for that domain. */
 520
 521                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 522                         (unsigned int)child->pid, domain->name ));
 523
 524                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_OFFLINE, child->domain->name,
 525                         strlen(child->domain->name)+1, False);
 526         }
 527 }
 528
 529 /* Set our domains as online and forward the online message to our children. */
 530
 531 void winbind_msg_online(int msg_type, struct process_id src,
 532                         void *buf, size_t len, void *private_data)
 533 {
 534         struct winbindd_child *child;
 535         struct winbindd_domain *domain;
 536
 537         DEBUG(10,("winbind_msg_online: got online message.\n"));
 538
 539         if (!lp_winbind_offline_logon()) {
 540                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 541                 return;
 542         }
 543
 544         /* Set our global state as online. */
 545         set_global_winbindd_state_online();
 546
 547         smb_nscd_flush_user_cache();
 548         smb_nscd_flush_group_cache();
 549
 550         /* Set all our domains as online. */
 551         for (domain = domain_list(); domain; domain = domain->next) {
 552                 if (domain->internal) {
 553                         continue;
 554                 }
 555                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 556
 557                 winbindd_flush_negative_conn_cache(domain);
 558                 set_domain_online_request(domain);
 559         }
 560
 561         for (child = children; child != NULL; child = child->next) {
 562                 /* Don't send message to idmap child. */
 563                 if (!child->domain || (child == idmap_child())) {
 564                         continue;
 565                 }
 566
 567                 /* Or internal domains (this should not be possible....) */
 568                 if (child->domain->internal) {
 569                         continue;
 570                 }
 571
 572                 /* Each winbindd child should only process requests for one domain - make sure
 573                    we only set it online / offline for that domain. */
 574
 575                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 576                         (unsigned int)child->pid, child->domain->name ));
 577
 578                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_ONLINE, child->domain->name,
 579                         strlen(child->domain->name)+1, False);
 580         }
 581 }
 582
 583 /* Forward the online/offline messages to our children. */
 584 void winbind_msg_onlinestatus(int msg_type, struct process_id src,
 585                               void *buf, size_t len, void *private_data)
 586 {
 587         struct winbindd_child *child;
 588
 589         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 590
 591         for (child = children; child != NULL; child = child->next) {
 592                 if (child->domain && child->domain->primary) {
 593                         DEBUG(10,("winbind_msg_onlinestatus: "
 594                                   "sending message to pid %u of primary domain.\n",
 595                                   (unsigned int)child->pid));
 596                         message_send_pid(pid_to_procid(child->pid),
 597                                          MSG_WINBIND_ONLINESTATUS, buf, len, False);
 598                         break;
 599                 }
 600         }
 601 }
 602
 603
 604 static void account_lockout_policy_handler(struct event_context *ctx,
 605                                            struct timed_event *te,
 606                                            const struct timeval *now,
 607                                            void *private_data)
 608 {
 609         struct winbindd_child *child =
 610                 (struct winbindd_child *)private_data;
 611         TALLOC_CTX *mem_ctx = NULL;
 612         struct winbindd_methods *methods;
 613         SAM_UNK_INFO_12 lockout_policy;
 614         NTSTATUS result;
 615
 616         DEBUG(10,("account_lockout_policy_handler called\n"));
 617
 618         if (child->lockout_policy_event) {
 619                 TALLOC_FREE(child->lockout_policy_event);
 620         }
 621
 622         methods = child->domain->methods;
 623
 624         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 625         if (!mem_ctx) {
 626                 result = NT_STATUS_NO_MEMORY;
 627         } else {
 628                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 629         }
 630
 631         talloc_destroy(mem_ctx);
 632
 633         if (!NT_STATUS_IS_OK(result)) {
 634                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 635                          nt_errstr(result)));
 636         }
 637
 638         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 639                                                       timeval_current_ofs(3600, 0),
 640                                                       "account_lockout_policy_handler",
 641                                                       account_lockout_policy_handler,
 642                                                       child);
 643 }
 644
 645 /* Deal with a request to go offline. */
 646
 647 static void child_msg_offline(int msg_type, struct process_id src,
 648                               void *buf, size_t len, void *private_data)
 649 {
 650         struct winbindd_domain *domain;
 651         const char *domainname = (const char *)buf;
 652
 653         if (buf == NULL || len == 0) {
 654                 return;
 655         }
 656
 657         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 658
 659         if (!lp_winbind_offline_logon()) {
 660                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 661                 return;
 662         }
 663
 664         /* Set our global state as offline. */
 665         if (!set_global_winbindd_state_offline()) {
 666                 DEBUG(10,("child_msg_offline: offline request failed.\n"));
 667                 return;
 668         }
 669
 670         /* Mark the requested domain offline. */
 671
 672         for (domain = domain_list(); domain; domain = domain->next) {
 673                 if (domain->internal) {
 674                         continue;
 675                 }
 676                 if (strequal(domain->name, domainname)) {
 677                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 678                         set_domain_offline(domain);
 679                 }
 680         }
 681 }
 682
 683 /* Deal with a request to go online. */
 684
 685 static void child_msg_online(int msg_type, struct process_id src,
 686                              void *buf, size_t len, void *private_data)
 687 {
 688         struct winbindd_domain *domain;
 689         const char *domainname = (const char *)buf;
 690
 691         if (buf == NULL || len == 0) {
 692                 return;
 693         }
 694
 695         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 696
 697         if (!lp_winbind_offline_logon()) {
 698                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 699                 return;
 700         }
 701
 702         /* Set our global state as online. */
 703         set_global_winbindd_state_online();
 704
 705         /* Try and mark everything online - delete any negative cache entries
 706            to force a reconnect now. */
 707
 708         for (domain = domain_list(); domain; domain = domain->next) {
 709                 if (domain->internal) {
 710                         continue;
 711                 }
 712                 if (strequal(domain->name, domainname)) {
 713                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 714                         winbindd_flush_negative_conn_cache(domain);
 715                         set_domain_online_request(domain);
 716                 }
 717         }
 718 }
 719
 720 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 721 {
 722         struct winbindd_domain *domain;
 723         char *buf = NULL;
 724
 725         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 726                                    get_global_winbindd_state_offline() ?
 727                                    "Offline":"Online")) == NULL) {
 728                 return NULL;
 729         }
 730
 731         for (domain = domain_list(); domain; domain = domain->next) {
 732                 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
 733                                                   domain->name,
 734                                                   domain->online ?
 735                                                   "Online":"Offline")) == NULL) {
 736                         return NULL;
 737                 }
 738         }
 739
 740         buf = talloc_asprintf_append(buf, "\n");
 741
 742         DEBUG(5,("collect_onlinestatus: %s", buf));
 743
 744         return buf;
 745 }
 746
 747 static void child_msg_onlinestatus(int msg_type, struct process_id src,
 748                                    void *buf, size_t len, void *private_data)
 749 {
 750         TALLOC_CTX *mem_ctx;
 751         const char *message;
 752         struct process_id *sender;
 753
 754         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 755
 756         if (!buf) {
 757                 return;
 758         }
 759
 760         sender = (struct process_id *)buf;
 761
 762         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 763         if (mem_ctx == NULL) {
 764                 return;
 765         }
 766
 767         message = collect_onlinestatus(mem_ctx);
 768         if (message == NULL) {
 769                 talloc_destroy(mem_ctx);
 770                 return;
 771         }
 772
 773         message_send_pid(*sender, MSG_WINBIND_ONLINESTATUS,
 774                          message, strlen(message) + 1, True);
 775
 776         talloc_destroy(mem_ctx);
 777 }
 778
 779 static BOOL fork_domain_child(struct winbindd_child *child)
 780 {
 781         int fdpair[2];
 782         struct winbindd_cli_state state;
 783         struct winbindd_domain *domain;
 784
 785         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 786                 DEBUG(0, ("Could not open child pipe: %s\n",
 787                           strerror(errno)));
 788                 return False;
 789         }
 790
 791         ZERO_STRUCT(state);
 792         state.pid = sys_getpid();
 793
 794         /* Stop zombies */
 795         CatchChild();
 796
 797         /* Ensure we don't process messages whilst we're
 798            changing the disposition for the child. */
 799         message_block();
 800
 801         child->pid = sys_fork();
 802
 803         if (child->pid == -1) {
 804                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 805                 message_unblock();
 806                 return False;
 807         }
 808
 809         if (child->pid != 0) {
 810                 /* Parent */
 811                 close(fdpair[0]);
 812                 child->next = child->prev = NULL;
 813                 DLIST_ADD(children, child);
 814                 child->event.fd = fdpair[1];
 815                 child->event.flags = 0;
 816                 child->requests = NULL;
 817                 add_fd_event(&child->event);
 818                 /* We're ok with online/offline messages now. */
 819                 message_unblock();
 820                 return True;
 821         }
 822
 823         /* Child */
 824
 825         state.sock = fdpair[0];
 826         close(fdpair[1]);
 827
 828         /* tdb needs special fork handling */
 829         if (tdb_reopen_all(1) == -1) {
 830                 DEBUG(0,("tdb_reopen_all failed.\n"));
 831                 _exit(0);
 832         }
 833
 834         close_conns_after_fork();
 835
 836         if (!override_logfile) {
 837                 lp_set_logfile(child->logfilename);
 838                 reopen_logs();
 839         }
 840
 841         /* Don't handle the same messages as our parent. */
 842         message_deregister(MSG_SMB_CONF_UPDATED);
 843         message_deregister(MSG_SHUTDOWN);
 844         message_deregister(MSG_WINBIND_OFFLINE);
 845         message_deregister(MSG_WINBIND_ONLINE);
 846         message_deregister(MSG_WINBIND_ONLINESTATUS);
 847
 848         /* The child is ok with online/offline messages now. */
 849         message_unblock();
 850
 851         /* Handle online/offline messages. */
 852         message_register(MSG_WINBIND_OFFLINE, child_msg_offline, NULL);
 853         message_register(MSG_WINBIND_ONLINE, child_msg_online, NULL);
 854         message_register(MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus,
 855                          NULL);
 856
 857         if ( child->domain ) {
 858                 child->domain->startup = True;
 859                 child->domain->startup_time = time(NULL);
 860         }
 861
 862         /* Ensure we have no pending check_online events other
 863            than one for this domain. */
 864
 865         for (domain = domain_list(); domain; domain = domain->next) {
 866                 if (domain != child->domain) {
 867                         if (domain->check_online_event) {
 868                                 TALLOC_FREE(domain->check_online_event);
 869                         }
 870                 }
 871         }
 872
 873         /* Ensure we're not handling an event inherited from
 874            our parent. */
 875
 876         cancel_named_event(winbind_event_context(),
 877                            "krb5_ticket_refresh_handler");
 878
 879         /* We might be in the idmap child...*/
 880         if (child->domain && lp_winbind_offline_logon()) {
 881
 882                 set_domain_online_request(child->domain);
 883
 884                 child->lockout_policy_event = event_add_timed(
 885                         winbind_event_context(), NULL, timeval_zero(),
 886                         "account_lockout_policy_handler",
 887                         account_lockout_policy_handler,
 888                         child);
 889         }
 890
 891         while (1) {
 892
 893                 int ret;
 894                 fd_set read_fds;
 895                 struct timeval t;
 896                 struct timeval *tp;
 897                 struct timeval now;
 898
 899                 /* free up any talloc memory */
 900                 lp_TALLOC_FREE();
 901                 main_loop_TALLOC_FREE();
 902
 903                 run_events(winbind_event_context(), 0, NULL, NULL);
 904
 905                 GetTimeOfDay(&now);
 906
 907                 if (child->domain && child->domain->startup &&
 908                                 (now.tv_sec > child->domain->startup_time + 30)) {
 909                         /* No longer in "startup" mode. */
 910                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
 911                                 child->domain->name ));
 912                         child->domain->startup = False;
 913                 }
 914
 915                 tp = get_timed_events_timeout(winbind_event_context(), &t);
 916                 if (tp) {
 917                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
 918                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
 919                 }
 920
 921                 /* Handle messages */
 922
 923                 message_dispatch();
 924
 925                 FD_ZERO(&read_fds);
 926                 FD_SET(state.sock, &read_fds);
 927
 928                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
 929
 930                 if (ret == 0) {
 931                         DEBUG(11,("nothing is ready yet, continue\n"));
 932                         continue;
 933                 }
 934
 935                 if (ret == -1 && errno == EINTR) {
 936                         /* We got a signal - continue. */
 937                         continue;
 938                 }
 939
 940                 if (ret == -1 && errno != EINTR) {
 941                         DEBUG(0,("select error occured\n"));
 942                         perror("select");
 943                         return False;
 944                 }
 945
 946                 /* fetch a request from the main daemon */
 947                 child_read_request(&state);
 948
 949                 if (state.finished) {
 950                         /* we lost contact with our parent */
 951                         exit(0);
 952                 }
 953
 954                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
 955
 956                 ZERO_STRUCT(state.response);
 957                 state.request.null_term = '\0';
 958                 child_process_request(child->domain, &state);
 959
 960                 SAFE_FREE(state.request.extra_data.data);
 961
 962                 cache_store_response(sys_getpid(), &state.response);
 963
 964                 SAFE_FREE(state.response.extra_data.data);
 965
 966                 /* We just send the result code back, the result
 967                  * structure needs to be fetched via the
 968                  * winbindd_cache. Hmm. That needs fixing... */
 969
 970                 if (write_data(state.sock,
 971                                (const char *)&state.response.result,
 972                                sizeof(state.response.result)) !=
 973                     sizeof(state.response.result)) {
 974                         DEBUG(0, ("Could not write result\n"));
 975                         exit(1);
 976                 }
 977         }
 978 }