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                 state->response->result = WINBINDD_ERROR;
 196                 return;
 197         }
 198
 199         SMB_ASSERT(cache_retrieve_response(child->pid,
 200                                            state->response));
 201
 202         cache_cleanup_response(child->pid);
 203
 204         DLIST_REMOVE(child->requests, state);
 205
 206         schedule_async_request(child);
 207
 208         state->continuation(state->private_data, True);
 209 }
 210
 211 static BOOL fork_domain_child(struct winbindd_child *child);
 212
 213 static void schedule_async_request(struct winbindd_child *child)
 214 {
 215         struct winbindd_async_request *request = child->requests;
 216
 217         if (request == NULL) {
 218                 return;
 219         }
 220
 221         if (child->event.flags != 0) {
 222                 return;         /* Busy */
 223         }
 224
 225         if ((child->pid == 0) && (!fork_domain_child(child))) {
 226                 /* Cancel all outstanding requests */
 227
 228                 while (request != NULL) {
 229                         /* request might be free'd in the continuation */
 230                         struct winbindd_async_request *next = request->next;
 231                         request->continuation(request->private_data, False);
 232                         request = next;
 233                 }
 234                 return;
 235         }
 236
 237         setup_async_write(&child->event, request->request,
 238                           sizeof(*request->request),
 239                           async_main_request_sent, request);
 240
 241         return;
 242 }
 243
 244 struct domain_request_state {
 245         TALLOC_CTX *mem_ctx;
 246         struct winbindd_domain *domain;
 247         struct winbindd_request *request;
 248         struct winbindd_response *response;
 249         void (*continuation)(void *private_data_data, BOOL success);
 250         void *private_data_data;
 251 };
 252
 253 static void domain_init_recv(void *private_data_data, BOOL success);
 254
 255 void async_domain_request(TALLOC_CTX *mem_ctx,
 256                           struct winbindd_domain *domain,
 257                           struct winbindd_request *request,
 258                           struct winbindd_response *response,
 259                           void (*continuation)(void *private_data_data, BOOL success),
 260                           void *private_data_data)
 261 {
 262         struct domain_request_state *state;
 263
 264         if (domain->initialized) {
 265                 async_request(mem_ctx, &domain->child, request, response,
 266                               continuation, private_data_data);
 267                 return;
 268         }
 269
 270         state = TALLOC_P(mem_ctx, struct domain_request_state);
 271         if (state == NULL) {
 272                 DEBUG(0, ("talloc failed\n"));
 273                 continuation(private_data_data, False);
 274                 return;
 275         }
 276
 277         state->mem_ctx = mem_ctx;
 278         state->domain = domain;
 279         state->request = request;
 280         state->response = response;
 281         state->continuation = continuation;
 282         state->private_data_data = private_data_data;
 283
 284         init_child_connection(domain, domain_init_recv, state);
 285 }
 286
 287 static void recvfrom_child(void *private_data_data, BOOL success)
 288 {
 289         struct winbindd_cli_state *state =
 290                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 291         enum winbindd_result result = state->response.result;
 292
 293         /* This is an optimization: The child has written directly to the
 294          * response buffer. The request itself is still in pending state,
 295          * state that in the result code. */
 296
 297         state->response.result = WINBINDD_PENDING;
 298
 299         if ((!success) || (result != WINBINDD_OK)) {
 300                 request_error(state);
 301                 return;
 302         }
 303
 304         request_ok(state);
 305 }
 306
 307 void sendto_child(struct winbindd_cli_state *state,
 308                   struct winbindd_child *child)
 309 {
 310         async_request(state->mem_ctx, child, &state->request,
 311                       &state->response, recvfrom_child, state);
 312 }
 313
 314 void sendto_domain(struct winbindd_cli_state *state,
 315                    struct winbindd_domain *domain)
 316 {
 317         async_domain_request(state->mem_ctx, domain,
 318                              &state->request, &state->response,
 319                              recvfrom_child, state);
 320 }
 321
 322 static void domain_init_recv(void *private_data_data, BOOL success)
 323 {
 324         struct domain_request_state *state =
 325                 talloc_get_type_abort(private_data_data, struct domain_request_state);
 326
 327         if (!success) {
 328                 DEBUG(5, ("Domain init returned an error\n"));
 329                 state->continuation(state->private_data_data, False);
 330                 return;
 331         }
 332
 333         async_request(state->mem_ctx, &state->domain->child,
 334                       state->request, state->response,
 335                       state->continuation, state->private_data_data);
 336 }
 337
 338 struct winbindd_child_dispatch_table {
 339         enum winbindd_cmd cmd;
 340         enum winbindd_result (*fn)(struct winbindd_domain *domain,
 341                                    struct winbindd_cli_state *state);
 342         const char *winbindd_cmd_name;
 343 };
 344
 345 static struct winbindd_child_dispatch_table child_dispatch_table[] = {
 346
 347         { WINBINDD_LOOKUPSID,            winbindd_dual_lookupsid,             "LOOKUPSID" },
 348         { WINBINDD_LOOKUPNAME,           winbindd_dual_lookupname,            "LOOKUPNAME" },
 349         { WINBINDD_LOOKUPRIDS,           winbindd_dual_lookuprids,            "LOOKUPRIDS" },
 350         { WINBINDD_LIST_TRUSTDOM,        winbindd_dual_list_trusted_domains,  "LIST_TRUSTDOM" },
 351         { WINBINDD_INIT_CONNECTION,      winbindd_dual_init_connection,       "INIT_CONNECTION" },
 352         { WINBINDD_GETDCNAME,            winbindd_dual_getdcname,             "GETDCNAME" },
 353         { WINBINDD_SHOW_SEQUENCE,        winbindd_dual_show_sequence,         "SHOW_SEQUENCE" },
 354         { WINBINDD_PAM_AUTH,             winbindd_dual_pam_auth,              "PAM_AUTH" },
 355         { WINBINDD_PAM_AUTH_CRAP,        winbindd_dual_pam_auth_crap,         "AUTH_CRAP" },
 356         { WINBINDD_PAM_LOGOFF,           winbindd_dual_pam_logoff,            "PAM_LOGOFF" },
 357         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP,winbindd_dual_pam_chng_pswd_auth_crap,"CHNG_PSWD_AUTH_CRAP" },
 358         { WINBINDD_PAM_CHAUTHTOK,        winbindd_dual_pam_chauthtok,         "PAM_CHAUTHTOK" },
 359         { WINBINDD_CHECK_MACHACC,        winbindd_dual_check_machine_acct,    "CHECK_MACHACC" },
 360         { WINBINDD_DUAL_SID2UID,         winbindd_dual_sid2uid,               "DUAL_SID2UID" },
 361         { WINBINDD_DUAL_SID2GID,         winbindd_dual_sid2gid,               "DUAL_SID2GID" },
 362         { WINBINDD_DUAL_SIDS2XIDS,       winbindd_dual_sids2xids,             "DUAL_SIDS2XIDS" },
 363         { WINBINDD_DUAL_UID2SID,         winbindd_dual_uid2sid,               "DUAL_UID2SID" },
 364         { WINBINDD_DUAL_GID2SID,         winbindd_dual_gid2sid,               "DUAL_GID2SID" },
 365         { WINBINDD_DUAL_UID2NAME,        winbindd_dual_uid2name,              "DUAL_UID2NAME" },
 366         { WINBINDD_DUAL_NAME2UID,        winbindd_dual_name2uid,              "DUAL_NAME2UID" },
 367         { WINBINDD_DUAL_GID2NAME,        winbindd_dual_gid2name,              "DUAL_GID2NAME" },
 368         { WINBINDD_DUAL_NAME2GID,        winbindd_dual_name2gid,              "DUAL_NAME2GID" },
 369         { WINBINDD_DUAL_SET_MAPPING,     winbindd_dual_set_mapping,           "DUAL_SET_MAPPING" },
 370         { WINBINDD_DUAL_SET_HWM,         winbindd_dual_set_hwm,               "DUAL_SET_HWMS" },
 371         { WINBINDD_DUAL_DUMP_MAPS,       winbindd_dual_dump_maps,             "DUAL_DUMP_MAPS" },
 372         { WINBINDD_DUAL_USERINFO,        winbindd_dual_userinfo,              "DUAL_USERINFO" },
 373         { WINBINDD_ALLOCATE_UID,         winbindd_dual_allocate_uid,          "ALLOCATE_UID" },
 374         { WINBINDD_ALLOCATE_GID,         winbindd_dual_allocate_gid,          "ALLOCATE_GID" },
 375         { WINBINDD_GETUSERDOMGROUPS,     winbindd_dual_getuserdomgroups,      "GETUSERDOMGROUPS" },
 376         { WINBINDD_DUAL_GETSIDALIASES,   winbindd_dual_getsidaliases,         "GETSIDALIASES" },
 377         { WINBINDD_CCACHE_NTLMAUTH,      winbindd_dual_ccache_ntlm_auth,      "CCACHE_NTLM_AUTH" },
 378         /* End of list */
 379
 380         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 381 };
 382
 383 static void child_process_request(struct winbindd_domain *domain,
 384                                   struct winbindd_cli_state *state)
 385 {
 386         struct winbindd_child_dispatch_table *table;
 387
 388         /* Free response data - we may be interrupted and receive another
 389            command before being able to send this data off. */
 390
 391         state->response.result = WINBINDD_ERROR;
 392         state->response.length = sizeof(struct winbindd_response);
 393
 394         state->mem_ctx = talloc_init("winbind request");
 395         if (state->mem_ctx == NULL)
 396                 return;
 397
 398         /* Process command */
 399
 400         for (table = child_dispatch_table; table->fn; table++) {
 401                 if (state->request.cmd == table->cmd) {
 402                         DEBUG(10,("process_request: request fn %s\n",
 403                                   table->winbindd_cmd_name ));
 404                         state->response.result = table->fn(domain, state);
 405                         break;
 406                 }
 407         }
 408
 409         if (!table->fn) {
 410                 DEBUG(10,("process_request: unknown request fn number %d\n",
 411                           (int)state->request.cmd ));
 412                 state->response.result = WINBINDD_ERROR;
 413         }
 414
 415         talloc_destroy(state->mem_ctx);
 416 }
 417
 418 void setup_domain_child(struct winbindd_domain *domain,
 419                         struct winbindd_child *child,
 420                         const char *explicit_logfile)
 421 {
 422         if (explicit_logfile != NULL) {
 423                 pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
 424                              dyn_LOGFILEBASE, explicit_logfile);
 425         } else if (domain != NULL) {
 426                 pstr_sprintf(child->logfilename, "%s/log.wb-%s",
 427                              dyn_LOGFILEBASE, domain->name);
 428         } else {
 429                 smb_panic("Internal error: domain == NULL && "
 430                           "explicit_logfile == NULL");
 431         }
 432
 433         child->domain = domain;
 434 }
 435
 436 struct winbindd_child *children = NULL;
 437
 438 void winbind_child_died(pid_t pid)
 439 {
 440         struct winbindd_child *child;
 441
 442         for (child = children; child != NULL; child = child->next) {
 443                 if (child->pid == pid) {
 444                         break;
 445                 }
 446         }
 447
 448         if (child == NULL) {
 449                 DEBUG(0, ("Unknown child %d died!\n", pid));
 450                 return;
 451         }
 452
 453         remove_fd_event(&child->event);
 454         close(child->event.fd);
 455         child->event.fd = 0;
 456         child->event.flags = 0;
 457         child->pid = 0;
 458
 459         schedule_async_request(child);
 460 }
 461
 462 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 463
 464 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 465 {
 466         flush_negative_conn_cache_for_domain(domain->name);
 467         if (*domain->alt_name) {
 468                 flush_negative_conn_cache_for_domain(domain->alt_name);
 469         }
 470 }
 471
 472 /* Set our domains as offline and forward the offline message to our children. */
 473
 474 void winbind_msg_offline(int msg_type, struct process_id src, void *buf, size_t len)
 475 {
 476         struct winbindd_child *child;
 477         struct winbindd_domain *domain;
 478
 479         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 480
 481         if (!lp_winbind_offline_logon()) {
 482                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 483                 return;
 484         }
 485
 486         /* Set our global state as offline. */
 487         if (!set_global_winbindd_state_offline()) {
 488                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 489                 return;
 490         }
 491
 492         /* Set all our domains as offline. */
 493         for (domain = domain_list(); domain; domain = domain->next) {
 494                 if (domain->internal) {
 495                         continue;
 496                 }
 497                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 498                 set_domain_offline(domain);
 499         }
 500
 501         for (child = children; child != NULL; child = child->next) {
 502                 /* Don't send message to idmap child. */
 503                 if (!child->domain || (child == idmap_child())) {
 504                         continue;
 505                 }
 506
 507                 /* Or internal domains (this should not be possible....) */
 508                 if (child->domain->internal) {
 509                         continue;
 510                 }
 511
 512                 /* Each winbindd child should only process requests for one domain - make sure
 513                    we only set it online / offline for that domain. */
 514
 515                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 516                         (unsigned int)child->pid, domain->name ));
 517
 518                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_OFFLINE, child->domain->name,
 519                         strlen(child->domain->name)+1, False);
 520         }
 521 }
 522
 523 /* Set our domains as online and forward the online message to our children. */
 524
 525 void winbind_msg_online(int msg_type, struct process_id src, void *buf, size_t len)
 526 {
 527         struct winbindd_child *child;
 528         struct winbindd_domain *domain;
 529
 530         DEBUG(10,("winbind_msg_online: got online message.\n"));
 531
 532         if (!lp_winbind_offline_logon()) {
 533                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 534                 return;
 535         }
 536
 537         /* Set our global state as online. */
 538         set_global_winbindd_state_online();
 539
 540         smb_nscd_flush_user_cache();
 541         smb_nscd_flush_group_cache();
 542
 543         /* Set all our domains as online. */
 544         for (domain = domain_list(); domain; domain = domain->next) {
 545                 if (domain->internal) {
 546                         continue;
 547                 }
 548                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 549
 550                 winbindd_flush_negative_conn_cache(domain);
 551                 set_domain_online_request(domain);
 552         }
 553
 554         for (child = children; child != NULL; child = child->next) {
 555                 /* Don't send message to idmap child. */
 556                 if (!child->domain || (child == idmap_child())) {
 557                         continue;
 558                 }
 559
 560                 /* Or internal domains (this should not be possible....) */
 561                 if (child->domain->internal) {
 562                         continue;
 563                 }
 564
 565                 /* Each winbindd child should only process requests for one domain - make sure
 566                    we only set it online / offline for that domain. */
 567
 568                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 569                         (unsigned int)child->pid, child->domain->name ));
 570
 571                 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_ONLINE, child->domain->name,
 572                         strlen(child->domain->name)+1, False);
 573         }
 574 }
 575
 576 /* Forward the online/offline messages to our children. */
 577 void winbind_msg_onlinestatus(int msg_type, struct process_id src, void *buf, size_t len)
 578 {
 579         struct winbindd_child *child;
 580
 581         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 582
 583         for (child = children; child != NULL; child = child->next) {
 584                 if (child->domain && child->domain->primary) {
 585                         DEBUG(10,("winbind_msg_onlinestatus: "
 586                                   "sending message to pid %u of primary domain.\n",
 587                                   (unsigned int)child->pid));
 588                         message_send_pid(pid_to_procid(child->pid),
 589                                          MSG_WINBIND_ONLINESTATUS, buf, len, False);
 590                         break;
 591                 }
 592         }
 593 }
 594
 595
 596 static void account_lockout_policy_handler(struct timed_event *te,
 597                                            const struct timeval *now,
 598                                            void *private_data)
 599 {
 600         struct winbindd_child *child =
 601                 (struct winbindd_child *)private_data;
 602         TALLOC_CTX *mem_ctx = NULL;
 603         struct winbindd_methods *methods;
 604         SAM_UNK_INFO_12 lockout_policy;
 605         NTSTATUS result;
 606
 607         DEBUG(10,("account_lockout_policy_handler called\n"));
 608
 609         if (child->lockout_policy_event) {
 610                 TALLOC_FREE(child->lockout_policy_event);
 611         }
 612
 613         methods = child->domain->methods;
 614
 615         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 616         if (!mem_ctx) {
 617                 result = NT_STATUS_NO_MEMORY;
 618         } else {
 619                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 620         }
 621
 622         talloc_destroy(mem_ctx);
 623
 624         if (!NT_STATUS_IS_OK(result)) {
 625                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 626                          nt_errstr(result)));
 627         }
 628
 629         child->lockout_policy_event = add_timed_event(NULL,
 630                                                       timeval_current_ofs(3600, 0),
 631                                                       "account_lockout_policy_handler",
 632                                                       account_lockout_policy_handler,
 633                                                       child);
 634 }
 635
 636 /* Deal with a request to go offline. */
 637
 638 static void child_msg_offline(int msg_type, struct process_id src, void *buf, size_t len)
 639 {
 640         struct winbindd_domain *domain;
 641         const char *domainname = (const char *)buf;
 642
 643         if (buf == NULL || len == 0) {
 644                 return;
 645         }
 646
 647         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 648
 649         if (!lp_winbind_offline_logon()) {
 650                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 651                 return;
 652         }
 653
 654         /* Set our global state as offline. */
 655         if (!set_global_winbindd_state_offline()) {
 656                 DEBUG(10,("child_msg_offline: offline request failed.\n"));
 657                 return;
 658         }
 659
 660         /* Mark the requested domain offline. */
 661
 662         for (domain = domain_list(); domain; domain = domain->next) {
 663                 if (domain->internal) {
 664                         continue;
 665                 }
 666                 if (strequal(domain->name, domainname)) {
 667                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 668                         set_domain_offline(domain);
 669                 }
 670         }
 671 }
 672
 673 /* Deal with a request to go online. */
 674
 675 static void child_msg_online(int msg_type, struct process_id src, void *buf, size_t len)
 676 {
 677         struct winbindd_domain *domain;
 678         const char *domainname = (const char *)buf;
 679
 680         if (buf == NULL || len == 0) {
 681                 return;
 682         }
 683
 684         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 685
 686         if (!lp_winbind_offline_logon()) {
 687                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 688                 return;
 689         }
 690
 691         /* Set our global state as online. */
 692         set_global_winbindd_state_online();
 693
 694         /* Try and mark everything online - delete any negative cache entries
 695            to force a reconnect now. */
 696
 697         for (domain = domain_list(); domain; domain = domain->next) {
 698                 if (domain->internal) {
 699                         continue;
 700                 }
 701                 if (strequal(domain->name, domainname)) {
 702                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 703                         winbindd_flush_negative_conn_cache(domain);
 704                         set_domain_online_request(domain);
 705                 }
 706         }
 707 }
 708
 709 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 710 {
 711         struct winbindd_domain *domain;
 712         char *buf = NULL;
 713
 714         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 715                                    get_global_winbindd_state_offline() ?
 716                                    "Offline":"Online")) == NULL) {
 717                 return NULL;
 718         }
 719
 720         for (domain = domain_list(); domain; domain = domain->next) {
 721                 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
 722                                                   domain->name,
 723                                                   domain->online ?
 724                                                   "Online":"Offline")) == NULL) {
 725                         return NULL;
 726                 }
 727         }
 728
 729         buf = talloc_asprintf_append(buf, "\n");
 730
 731         DEBUG(5,("collect_onlinestatus: %s", buf));
 732
 733         return buf;
 734 }
 735
 736 static void child_msg_onlinestatus(int msg_type, struct process_id src, void *buf, size_t len)
 737 {
 738         TALLOC_CTX *mem_ctx;
 739         const char *message;
 740         struct process_id *sender;
 741
 742         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 743
 744         if (!buf) {
 745                 return;
 746         }
 747
 748         sender = (struct process_id *)buf;
 749
 750         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 751         if (mem_ctx == NULL) {
 752                 return;
 753         }
 754
 755         message = collect_onlinestatus(mem_ctx);
 756         if (message == NULL) {
 757                 talloc_destroy(mem_ctx);
 758                 return;
 759         }
 760
 761         message_send_pid(*sender, MSG_WINBIND_ONLINESTATUS,
 762                          message, strlen(message) + 1, True);
 763
 764         talloc_destroy(mem_ctx);
 765 }
 766
 767 static BOOL fork_domain_child(struct winbindd_child *child)
 768 {
 769         int fdpair[2];
 770         struct winbindd_cli_state state;
 771         struct winbindd_domain *domain;
 772
 773         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 774                 DEBUG(0, ("Could not open child pipe: %s\n",
 775                           strerror(errno)));
 776                 return False;
 777         }
 778
 779         ZERO_STRUCT(state);
 780         state.pid = sys_getpid();
 781
 782         /* Stop zombies */
 783         CatchChild();
 784
 785         /* Ensure we don't process messages whilst we're
 786            changing the disposition for the child. */
 787         message_block();
 788
 789         child->pid = sys_fork();
 790
 791         if (child->pid == -1) {
 792                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 793                 message_unblock();
 794                 return False;
 795         }
 796
 797         if (child->pid != 0) {
 798                 /* Parent */
 799                 close(fdpair[0]);
 800                 child->next = child->prev = NULL;
 801                 DLIST_ADD(children, child);
 802                 child->event.fd = fdpair[1];
 803                 child->event.flags = 0;
 804                 child->requests = NULL;
 805                 add_fd_event(&child->event);
 806                 /* We're ok with online/offline messages now. */
 807                 message_unblock();
 808                 return True;
 809         }
 810
 811         /* Child */
 812
 813         state.sock = fdpair[0];
 814         close(fdpair[1]);
 815
 816         /* tdb needs special fork handling */
 817         if (tdb_reopen_all(1) == -1) {
 818                 DEBUG(0,("tdb_reopen_all failed.\n"));
 819                 _exit(0);
 820         }
 821
 822         close_conns_after_fork();
 823
 824         if (!override_logfile) {
 825                 lp_set_logfile(child->logfilename);
 826                 reopen_logs();
 827         }
 828
 829         /* Don't handle the same messages as our parent. */
 830         message_deregister(MSG_SMB_CONF_UPDATED);
 831         message_deregister(MSG_SHUTDOWN);
 832         message_deregister(MSG_WINBIND_OFFLINE);
 833         message_deregister(MSG_WINBIND_ONLINE);
 834         message_deregister(MSG_WINBIND_ONLINESTATUS);
 835
 836         /* The child is ok with online/offline messages now. */
 837         message_unblock();
 838
 839         if (child->domain != NULL && lp_winbind_offline_logon()) {
 840                 /* We might be in the idmap child...*/
 841                 child->lockout_policy_event = add_timed_event(
 842                         NULL, timeval_zero(),
 843                         "account_lockout_policy_handler",
 844                         account_lockout_policy_handler,
 845                         child);
 846         }
 847
 848         /* Handle online/offline messages. */
 849         message_register(MSG_WINBIND_OFFLINE,child_msg_offline);
 850         message_register(MSG_WINBIND_ONLINE,child_msg_online);
 851         message_register(MSG_WINBIND_ONLINESTATUS,child_msg_onlinestatus);
 852
 853         if ( child->domain ) {
 854                 child->domain->startup = True;
 855                 child->domain->startup_time = time(NULL);
 856         }
 857
 858         /* Ensure we have no pending check_online events other
 859            than one for this domain. */
 860
 861         for (domain = domain_list(); domain; domain = domain->next) {
 862                 if (domain != child->domain) {
 863                         if (domain->check_online_event) {
 864                                 TALLOC_FREE(domain->check_online_event);
 865                         }
 866                 }
 867         }
 868
 869         /* Ensure we're not handling an event inherited from
 870            our parent. */
 871
 872         cancel_named_event("krb5_ticket_refresh_handler");
 873
 874         while (1) {
 875
 876                 int ret;
 877                 fd_set read_fds;
 878                 struct timeval t;
 879                 struct timeval *tp;
 880                 struct timeval now;
 881
 882                 /* free up any talloc memory */
 883                 lp_TALLOC_FREE();
 884                 main_loop_TALLOC_FREE();
 885
 886                 run_events();
 887
 888                 GetTimeOfDay(&now);
 889
 890                 if (child->domain && child->domain->startup &&
 891                                 (now.tv_sec > child->domain->startup_time + 30)) {
 892                         /* No longer in "startup" mode. */
 893                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
 894                                 child->domain->name ));
 895                         child->domain->startup = False;
 896                 }
 897
 898                 tp = get_timed_events_timeout(&t);
 899                 if (tp) {
 900                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
 901                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
 902                 }
 903
 904                 /* Handle messages */
 905
 906                 message_dispatch();
 907
 908                 FD_ZERO(&read_fds);
 909                 FD_SET(state.sock, &read_fds);
 910
 911                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
 912
 913                 if (ret == 0) {
 914                         DEBUG(11,("nothing is ready yet, continue\n"));
 915                         continue;
 916                 }
 917
 918                 if (ret == -1 && errno == EINTR) {
 919                         /* We got a signal - continue. */
 920                         continue;
 921                 }
 922
 923                 if (ret == -1 && errno != EINTR) {
 924                         DEBUG(0,("select error occured\n"));
 925                         perror("select");
 926                         return False;
 927                 }
 928
 929                 /* fetch a request from the main daemon */
 930                 child_read_request(&state);
 931
 932                 if (state.finished) {
 933                         /* we lost contact with our parent */
 934                         exit(0);
 935                 }
 936
 937                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
 938
 939                 ZERO_STRUCT(state.response);
 940                 state.request.null_term = '\0';
 941                 child_process_request(child->domain, &state);
 942
 943                 SAFE_FREE(state.request.extra_data.data);
 944
 945                 cache_store_response(sys_getpid(), &state.response);
 946
 947                 SAFE_FREE(state.response.extra_data.data);
 948
 949                 /* We just send the result code back, the result
 950                  * structure needs to be fetched via the
 951                  * winbindd_cache. Hmm. That needs fixing... */
 952
 953                 if (write_data(state.sock,
 954                                (const char *)&state.response.result,
 955                                sizeof(state.response.result)) !=
 956                     sizeof(state.response.result)) {
 957                         DEBUG(0, ("Could not write result\n"));
 958                         exit(1);
 959                 }
 960         }
 961 }