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 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, void *buf, size_t len)
 480 {
 481         struct winbindd_child *child;
 482         struct winbindd_domain *domain;
 483
 484         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 485
 486         if (!lp_winbind_offline_logon()) {
 487                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 488                 return;
 489         }
 490
 491         /* Set our global state as offline. */
 492         if (!set_global_winbindd_state_offline()) {
 493                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 494                 return;
 495         }
 496
 497         /* Set all our domains as offline. */
 498         for (domain = domain_list(); domain; domain = domain->next) {
 499                 if (domain->internal) {
 500                         continue;
 501                 }
 502                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 503                 set_domain_offline(domain);
 504         }
 505
 506         for (child = children; child != NULL; child = child->next) {
 507                 /* Don't send message to idmap child. */
 508                 if (!child->domain || (child == idmap_child())) {
 509                         continue;
 510                 }
 511
 512                 /* Or internal domains (this should not be possible....) */
 513                 if (child->domain->internal) {
 514                         continue;
 515                 }
 516
 517                 /* Each winbindd child should only process requests for one domain - make sure
 518                    we only set it online / offline for that domain. */
 519
 520                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 521                         (unsigned int)child->pid, domain->name ));
 522
 523                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_OFFLINE, child->domain->name,
 524                         strlen(child->domain->name)+1, False);
 525         }
 526 }
 527
 528 /* Set our domains as online and forward the online message to our children. */
 529
 530 void winbind_msg_online(int msg_type, struct process_id src, void *buf, size_t len)
 531 {
 532         struct winbindd_child *child;
 533         struct winbindd_domain *domain;
 534
 535         DEBUG(10,("winbind_msg_online: got online message.\n"));
 536
 537         if (!lp_winbind_offline_logon()) {
 538                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 539                 return;
 540         }
 541
 542         /* Set our global state as online. */
 543         set_global_winbindd_state_online();
 544
 545         smb_nscd_flush_user_cache();
 546         smb_nscd_flush_group_cache();
 547
 548         /* Set all our domains as online. */
 549         for (domain = domain_list(); domain; domain = domain->next) {
 550                 if (domain->internal) {
 551                         continue;
 552                 }
 553                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 554
 555                 winbindd_flush_negative_conn_cache(domain);
 556                 set_domain_online_request(domain);
 557         }
 558
 559         for (child = children; child != NULL; child = child->next) {
 560                 /* Don't send message to idmap child. */
 561                 if (!child->domain || (child == idmap_child())) {
 562                         continue;
 563                 }
 564
 565                 /* Or internal domains (this should not be possible....) */
 566                 if (child->domain->internal) {
 567                         continue;
 568                 }
 569
 570                 /* Each winbindd child should only process requests for one domain - make sure
 571                    we only set it online / offline for that domain. */
 572
 573                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 574                         (unsigned int)child->pid, child->domain->name ));
 575
 576                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_ONLINE, child->domain->name,
 577                         strlen(child->domain->name)+1, False);
 578         }
 579 }
 580
 581 /* Forward the online/offline messages to our children. */
 582 void winbind_msg_onlinestatus(int msg_type, struct process_id src, void *buf, size_t len)
 583 {
 584         struct winbindd_child *child;
 585
 586         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 587
 588         for (child = children; child != NULL; child = child->next) {
 589                 if (child->domain && child->domain->primary) {
 590                         DEBUG(10,("winbind_msg_onlinestatus: "
 591                                   "sending message to pid %u of primary domain.\n",
 592                                   (unsigned int)child->pid));
 593                         message_send_pid(pid_to_procid(child->pid),
 594                                          MSG_WINBIND_ONLINESTATUS, buf, len, False);
 595                         break;
 596                 }
 597         }
 598 }
 599
 600
 601 static void account_lockout_policy_handler(struct event_context *ctx,
 602                                            struct timed_event *te,
 603                                            const struct timeval *now,
 604                                            void *private_data)
 605 {
 606         struct winbindd_child *child =
 607                 (struct winbindd_child *)private_data;
 608         TALLOC_CTX *mem_ctx = NULL;
 609         struct winbindd_methods *methods;
 610         SAM_UNK_INFO_12 lockout_policy;
 611         NTSTATUS result;
 612
 613         DEBUG(10,("account_lockout_policy_handler called\n"));
 614
 615         if (child->lockout_policy_event) {
 616                 TALLOC_FREE(child->lockout_policy_event);
 617         }
 618
 619         methods = child->domain->methods;
 620
 621         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 622         if (!mem_ctx) {
 623                 result = NT_STATUS_NO_MEMORY;
 624         } else {
 625                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 626         }
 627
 628         talloc_destroy(mem_ctx);
 629
 630         if (!NT_STATUS_IS_OK(result)) {
 631                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 632                          nt_errstr(result)));
 633         }
 634
 635         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 636                                                       timeval_current_ofs(3600, 0),
 637                                                       "account_lockout_policy_handler",
 638                                                       account_lockout_policy_handler,
 639                                                       child);
 640 }
 641
 642 /* Deal with a request to go offline. */
 643
 644 static void child_msg_offline(int msg_type, struct process_id src, void *buf, size_t len)
 645 {
 646         struct winbindd_domain *domain;
 647         const char *domainname = (const char *)buf;
 648
 649         if (buf == NULL || len == 0) {
 650                 return;
 651         }
 652
 653         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 654
 655         if (!lp_winbind_offline_logon()) {
 656                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 657                 return;
 658         }
 659
 660         /* Set our global state as offline. */
 661         if (!set_global_winbindd_state_offline()) {
 662                 DEBUG(10,("child_msg_offline: offline request failed.\n"));
 663                 return;
 664         }
 665
 666         /* Mark the requested domain offline. */
 667
 668         for (domain = domain_list(); domain; domain = domain->next) {
 669                 if (domain->internal) {
 670                         continue;
 671                 }
 672                 if (strequal(domain->name, domainname)) {
 673                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 674                         set_domain_offline(domain);
 675                 }
 676         }
 677 }
 678
 679 /* Deal with a request to go online. */
 680
 681 static void child_msg_online(int msg_type, struct process_id src, void *buf, size_t len)
 682 {
 683         struct winbindd_domain *domain;
 684         const char *domainname = (const char *)buf;
 685
 686         if (buf == NULL || len == 0) {
 687                 return;
 688         }
 689
 690         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 691
 692         if (!lp_winbind_offline_logon()) {
 693                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 694                 return;
 695         }
 696
 697         /* Set our global state as online. */
 698         set_global_winbindd_state_online();
 699
 700         /* Try and mark everything online - delete any negative cache entries
 701            to force a reconnect now. */
 702
 703         for (domain = domain_list(); domain; domain = domain->next) {
 704                 if (domain->internal) {
 705                         continue;
 706                 }
 707                 if (strequal(domain->name, domainname)) {
 708                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 709                         winbindd_flush_negative_conn_cache(domain);
 710                         set_domain_online_request(domain);
 711                 }
 712         }
 713 }
 714
 715 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 716 {
 717         struct winbindd_domain *domain;
 718         char *buf = NULL;
 719
 720         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 721                                    get_global_winbindd_state_offline() ?
 722                                    "Offline":"Online")) == NULL) {
 723                 return NULL;
 724         }
 725
 726         for (domain = domain_list(); domain; domain = domain->next) {
 727                 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
 728                                                   domain->name,
 729                                                   domain->online ?
 730                                                   "Online":"Offline")) == NULL) {
 731                         return NULL;
 732                 }
 733         }
 734
 735         buf = talloc_asprintf_append(buf, "\n");
 736
 737         DEBUG(5,("collect_onlinestatus: %s", buf));
 738
 739         return buf;
 740 }
 741
 742 static void child_msg_onlinestatus(int msg_type, struct process_id src, void *buf, size_t len)
 743 {
 744         TALLOC_CTX *mem_ctx;
 745         const char *message;
 746         struct process_id *sender;
 747
 748         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 749
 750         if (!buf) {
 751                 return;
 752         }
 753
 754         sender = (struct process_id *)buf;
 755
 756         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 757         if (mem_ctx == NULL) {
 758                 return;
 759         }
 760
 761         message = collect_onlinestatus(mem_ctx);
 762         if (message == NULL) {
 763                 talloc_destroy(mem_ctx);
 764                 return;
 765         }
 766
 767         message_send_pid(*sender, MSG_WINBIND_ONLINESTATUS,
 768                          message, strlen(message) + 1, True);
 769
 770         talloc_destroy(mem_ctx);
 771 }
 772
 773 static BOOL fork_domain_child(struct winbindd_child *child)
 774 {
 775         int fdpair[2];
 776         struct winbindd_cli_state state;
 777         struct winbindd_domain *domain;
 778
 779         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 780                 DEBUG(0, ("Could not open child pipe: %s\n",
 781                           strerror(errno)));
 782                 return False;
 783         }
 784
 785         ZERO_STRUCT(state);
 786         state.pid = sys_getpid();
 787
 788         /* Stop zombies */
 789         CatchChild();
 790
 791         /* Ensure we don't process messages whilst we're
 792            changing the disposition for the child. */
 793         message_block();
 794
 795         child->pid = sys_fork();
 796
 797         if (child->pid == -1) {
 798                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 799                 message_unblock();
 800                 return False;
 801         }
 802
 803         if (child->pid != 0) {
 804                 /* Parent */
 805                 close(fdpair[0]);
 806                 child->next = child->prev = NULL;
 807                 DLIST_ADD(children, child);
 808                 child->event.fd = fdpair[1];
 809                 child->event.flags = 0;
 810                 child->requests = NULL;
 811                 add_fd_event(&child->event);
 812                 /* We're ok with online/offline messages now. */
 813                 message_unblock();
 814                 return True;
 815         }
 816
 817         /* Child */
 818
 819         state.sock = fdpair[0];
 820         close(fdpair[1]);
 821
 822         /* tdb needs special fork handling */
 823         if (tdb_reopen_all(1) == -1) {
 824                 DEBUG(0,("tdb_reopen_all failed.\n"));
 825                 _exit(0);
 826         }
 827
 828         close_conns_after_fork();
 829
 830         if (!override_logfile) {
 831                 lp_set_logfile(child->logfilename);
 832                 reopen_logs();
 833         }
 834
 835         /* Don't handle the same messages as our parent. */
 836         message_deregister(MSG_SMB_CONF_UPDATED);
 837         message_deregister(MSG_SHUTDOWN);
 838         message_deregister(MSG_WINBIND_OFFLINE);
 839         message_deregister(MSG_WINBIND_ONLINE);
 840         message_deregister(MSG_WINBIND_ONLINESTATUS);
 841
 842         /* The child is ok with online/offline messages now. */
 843         message_unblock();
 844
 845         /* Handle online/offline messages. */
 846         message_register(MSG_WINBIND_OFFLINE,child_msg_offline);
 847         message_register(MSG_WINBIND_ONLINE,child_msg_online);
 848         message_register(MSG_WINBIND_ONLINESTATUS,child_msg_onlinestatus);
 849
 850         if ( child->domain ) {
 851                 child->domain->startup = True;
 852                 child->domain->startup_time = time(NULL);
 853         }
 854
 855         /* Ensure we have no pending check_online events other
 856            than one for this domain. */
 857
 858         for (domain = domain_list(); domain; domain = domain->next) {
 859                 if (domain != child->domain) {
 860                         if (domain->check_online_event) {
 861                                 TALLOC_FREE(domain->check_online_event);
 862                         }
 863                 }
 864         }
 865
 866         /* Ensure we're not handling an event inherited from
 867            our parent. */
 868
 869         cancel_named_event(winbind_event_context(),
 870                            "krb5_ticket_refresh_handler");
 871
 872         /* We might be in the idmap child...*/
 873         if (child->domain && lp_winbind_offline_logon()) {
 874
 875                 set_domain_online_request(child->domain);
 876
 877                 child->lockout_policy_event = event_add_timed(
 878                         winbind_event_context(), NULL, timeval_zero(),
 879                         "account_lockout_policy_handler",
 880                         account_lockout_policy_handler,
 881                         child);
 882         }
 883
 884         while (1) {
 885
 886                 int ret;
 887                 fd_set read_fds;
 888                 struct timeval t;
 889                 struct timeval *tp;
 890                 struct timeval now;
 891
 892                 /* free up any talloc memory */
 893                 lp_TALLOC_FREE();
 894                 main_loop_TALLOC_FREE();
 895
 896                 run_events(winbind_event_context(), 0, NULL, NULL);
 897
 898                 GetTimeOfDay(&now);
 899
 900                 if (child->domain && child->domain->startup &&
 901                                 (now.tv_sec > child->domain->startup_time + 30)) {
 902                         /* No longer in "startup" mode. */
 903                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
 904                                 child->domain->name ));
 905                         child->domain->startup = False;
 906                 }
 907
 908                 tp = get_timed_events_timeout(winbind_event_context(), &t);
 909                 if (tp) {
 910                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
 911                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
 912                 }
 913
 914                 /* Handle messages */
 915
 916                 message_dispatch();
 917
 918                 FD_ZERO(&read_fds);
 919                 FD_SET(state.sock, &read_fds);
 920
 921                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
 922
 923                 if (ret == 0) {
 924                         DEBUG(11,("nothing is ready yet, continue\n"));
 925                         continue;
 926                 }
 927
 928                 if (ret == -1 && errno == EINTR) {
 929                         /* We got a signal - continue. */
 930                         continue;
 931                 }
 932
 933                 if (ret == -1 && errno != EINTR) {
 934                         DEBUG(0,("select error occured\n"));
 935                         perror("select");
 936                         return False;
 937                 }
 938
 939                 /* fetch a request from the main daemon */
 940                 child_read_request(&state);
 941
 942                 if (state.finished) {
 943                         /* we lost contact with our parent */
 944                         exit(0);
 945                 }
 946
 947                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
 948
 949                 ZERO_STRUCT(state.response);
 950                 state.request.null_term = '\0';
 951                 child_process_request(child->domain, &state);
 952
 953                 SAFE_FREE(state.request.extra_data.data);
 954
 955                 cache_store_response(sys_getpid(), &state.response);
 956
 957                 SAFE_FREE(state.response.extra_data.data);
 958
 959                 /* We just send the result code back, the result
 960                  * structure needs to be fetched via the
 961                  * winbindd_cache. Hmm. That needs fixing... */
 962
 963                 if (write_data(state.sock,
 964                                (const char *)&state.response.result,
 965                                sizeof(state.response.result)) !=
 966                     sizeof(state.response.result)) {
 967                         DEBUG(0, ("Could not write result\n"));
 968                         exit(1);
 969                 }
 970         }
 971 }