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 3 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         struct timed_event *reply_timeout_event;
 100         pid_t child_pid; /* pid of the child we're waiting on. Used to detect
 101                             a restart of the child (child->pid != child_pid). */
 102         void *private_data;
 103 };
 104
 105 static void async_main_request_sent(void *private_data, BOOL success);
 106 static void async_request_sent(void *private_data, BOOL success);
 107 static void async_reply_recv(void *private_data, BOOL success);
 108 static void schedule_async_request(struct winbindd_child *child);
 109
 110 void async_request(TALLOC_CTX *mem_ctx, struct winbindd_child *child,
 111                    struct winbindd_request *request,
 112                    struct winbindd_response *response,
 113                    void (*continuation)(void *private_data, BOOL success),
 114                    void *private_data)
 115 {
 116         struct winbindd_async_request *state;
 117
 118         SMB_ASSERT(continuation != NULL);
 119
 120         state = TALLOC_P(mem_ctx, struct winbindd_async_request);
 121
 122         if (state == NULL) {
 123                 DEBUG(0, ("talloc failed\n"));
 124                 continuation(private_data, False);
 125                 return;
 126         }
 127
 128         state->mem_ctx = mem_ctx;
 129         state->child = child;
 130         state->request = request;
 131         state->response = response;
 132         state->continuation = continuation;
 133         state->private_data = private_data;
 134
 135         DLIST_ADD_END(child->requests, state, struct winbindd_async_request *);
 136
 137         schedule_async_request(child);
 138
 139         return;
 140 }
 141
 142 static void async_main_request_sent(void *private_data, BOOL success)
 143 {
 144         struct winbindd_async_request *state =
 145                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 146
 147         if (!success) {
 148                 DEBUG(5, ("Could not send async request\n"));
 149
 150                 state->response->length = sizeof(struct winbindd_response);
 151                 state->response->result = WINBINDD_ERROR;
 152                 state->continuation(state->private_data, False);
 153                 return;
 154         }
 155
 156         if (state->request->extra_len == 0) {
 157                 async_request_sent(private_data, True);
 158                 return;
 159         }
 160
 161         setup_async_write(&state->child->event, state->request->extra_data.data,
 162                           state->request->extra_len,
 163                           async_request_sent, state);
 164 }
 165
 166 /****************************************************************
 167  Handler triggered if the child winbindd doesn't respond within
 168  a given timeout.
 169 ****************************************************************/
 170
 171 static void async_request_timeout_handler(struct event_context *ctx,
 172                                         struct timed_event *te,
 173                                         const struct timeval *now,
 174                                         void *private_data)
 175 {
 176         struct winbindd_async_request *state =
 177                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 178
 179         DEBUG(0,("async_request_timeout_handler: child pid %u is not responding. "
 180                 "Closing connection to it.\n",
 181                 state->child_pid ));
 182
 183         /* Deal with the reply - set to error. */
 184         async_reply_recv(private_data, False);
 185 }
 186
 187 /**************************************************************
 188  Common function called on both async send and recv fail.
 189  Cleans up the child and schedules the next request.
 190 **************************************************************/
 191
 192 static void async_request_fail(struct winbindd_async_request *state)
 193 {
 194         DLIST_REMOVE(state->child->requests, state);
 195
 196         TALLOC_FREE(state->reply_timeout_event);
 197
 198         SMB_ASSERT(state->child_pid != (pid_t)0);
 199
 200         /* If not already reaped, send kill signal to child. */
 201         if (state->child->pid == state->child_pid) {
 202                 kill(state->child_pid, SIGTERM);
 203
 204                 /*
 205                  * Close the socket to the child.
 206                  */
 207                 winbind_child_died(state->child_pid);
 208         }
 209
 210         state->response->length = sizeof(struct winbindd_response);
 211         state->response->result = WINBINDD_ERROR;
 212         state->continuation(state->private_data, False);
 213 }
 214
 215 static void async_request_sent(void *private_data_data, BOOL success)
 216 {
 217         struct winbindd_async_request *state =
 218                 talloc_get_type_abort(private_data_data, struct winbindd_async_request);
 219
 220         if (!success) {
 221                 DEBUG(5, ("Could not send async request to child pid %u\n",
 222                         (unsigned int)state->child_pid ));
 223                 async_request_fail(state);
 224                 return;
 225         }
 226
 227         /* Request successfully sent to the child, setup the wait for reply */
 228
 229         setup_async_read(&state->child->event,
 230                          &state->response->result,
 231                          sizeof(state->response->result),
 232                          async_reply_recv, state);
 233
 234         /*
 235          * Set up a timeout of 300 seconds for the response.
 236          * If we don't get it close the child socket and
 237          * report failure.
 238          */
 239
 240         state->reply_timeout_event = event_add_timed(winbind_event_context(),
 241                                                         NULL,
 242                                                         timeval_current_ofs(300,0),
 243                                                         "async_request_timeout",
 244                                                         async_request_timeout_handler,
 245                                                         state);
 246         if (!state->reply_timeout_event) {
 247                 smb_panic("async_request_sent: failed to add timeout handler.\n");
 248         }
 249 }
 250
 251 static void async_reply_recv(void *private_data, BOOL success)
 252 {
 253         struct winbindd_async_request *state =
 254                 talloc_get_type_abort(private_data, struct winbindd_async_request);
 255         struct winbindd_child *child = state->child;
 256
 257         TALLOC_FREE(state->reply_timeout_event);
 258
 259         state->response->length = sizeof(struct winbindd_response);
 260
 261         if (!success) {
 262                 DEBUG(5, ("Could not receive async reply from child pid %u\n",
 263                         (unsigned int)state->child_pid ));
 264
 265                 cache_cleanup_response(state->child_pid);
 266                 async_request_fail(state);
 267                 return;
 268         }
 269
 270         SMB_ASSERT(cache_retrieve_response(state->child_pid,
 271                                            state->response));
 272
 273         cache_cleanup_response(state->child_pid);
 274
 275         DLIST_REMOVE(child->requests, state);
 276
 277         schedule_async_request(child);
 278
 279         state->continuation(state->private_data, True);
 280 }
 281
 282 static BOOL fork_domain_child(struct winbindd_child *child);
 283
 284 static void schedule_async_request(struct winbindd_child *child)
 285 {
 286         struct winbindd_async_request *request = child->requests;
 287
 288         if (request == NULL) {
 289                 return;
 290         }
 291
 292         if (child->event.flags != 0) {
 293                 return;         /* Busy */
 294         }
 295
 296         if ((child->pid == 0) && (!fork_domain_child(child))) {
 297                 /* Cancel all outstanding requests */
 298
 299                 while (request != NULL) {
 300                         /* request might be free'd in the continuation */
 301                         struct winbindd_async_request *next = request->next;
 302                         request->continuation(request->private_data, False);
 303                         request = next;
 304                 }
 305                 return;
 306         }
 307
 308         /* Now we know who we're sending to - remember the pid. */
 309         request->child_pid = child->pid;
 310
 311         setup_async_write(&child->event, request->request,
 312                           sizeof(*request->request),
 313                           async_main_request_sent, request);
 314
 315         return;
 316 }
 317
 318 struct domain_request_state {
 319         TALLOC_CTX *mem_ctx;
 320         struct winbindd_domain *domain;
 321         struct winbindd_request *request;
 322         struct winbindd_response *response;
 323         void (*continuation)(void *private_data_data, BOOL success);
 324         void *private_data_data;
 325 };
 326
 327 static void domain_init_recv(void *private_data_data, BOOL success);
 328
 329 void async_domain_request(TALLOC_CTX *mem_ctx,
 330                           struct winbindd_domain *domain,
 331                           struct winbindd_request *request,
 332                           struct winbindd_response *response,
 333                           void (*continuation)(void *private_data_data, BOOL success),
 334                           void *private_data_data)
 335 {
 336         struct domain_request_state *state;
 337
 338         if (domain->initialized) {
 339                 async_request(mem_ctx, &domain->child, request, response,
 340                               continuation, private_data_data);
 341                 return;
 342         }
 343
 344         state = TALLOC_P(mem_ctx, struct domain_request_state);
 345         if (state == NULL) {
 346                 DEBUG(0, ("talloc failed\n"));
 347                 continuation(private_data_data, False);
 348                 return;
 349         }
 350
 351         state->mem_ctx = mem_ctx;
 352         state->domain = domain;
 353         state->request = request;
 354         state->response = response;
 355         state->continuation = continuation;
 356         state->private_data_data = private_data_data;
 357
 358         init_child_connection(domain, domain_init_recv, state);
 359 }
 360
 361 static void recvfrom_child(void *private_data_data, BOOL success)
 362 {
 363         struct winbindd_cli_state *state =
 364                 talloc_get_type_abort(private_data_data, struct winbindd_cli_state);
 365         enum winbindd_result result = state->response.result;
 366
 367         /* This is an optimization: The child has written directly to the
 368          * response buffer. The request itself is still in pending state,
 369          * state that in the result code. */
 370
 371         state->response.result = WINBINDD_PENDING;
 372
 373         if ((!success) || (result != WINBINDD_OK)) {
 374                 request_error(state);
 375                 return;
 376         }
 377
 378         request_ok(state);
 379 }
 380
 381 void sendto_child(struct winbindd_cli_state *state,
 382                   struct winbindd_child *child)
 383 {
 384         async_request(state->mem_ctx, child, &state->request,
 385                       &state->response, recvfrom_child, state);
 386 }
 387
 388 void sendto_domain(struct winbindd_cli_state *state,
 389                    struct winbindd_domain *domain)
 390 {
 391         async_domain_request(state->mem_ctx, domain,
 392                              &state->request, &state->response,
 393                              recvfrom_child, state);
 394 }
 395
 396 static void domain_init_recv(void *private_data_data, BOOL success)
 397 {
 398         struct domain_request_state *state =
 399                 talloc_get_type_abort(private_data_data, struct domain_request_state);
 400
 401         if (!success) {
 402                 DEBUG(5, ("Domain init returned an error\n"));
 403                 state->continuation(state->private_data_data, False);
 404                 return;
 405         }
 406
 407         async_request(state->mem_ctx, &state->domain->child,
 408                       state->request, state->response,
 409                       state->continuation, state->private_data_data);
 410 }
 411
 412 struct winbindd_child_dispatch_table {
 413         enum winbindd_cmd cmd;
 414         enum winbindd_result (*fn)(struct winbindd_domain *domain,
 415                                    struct winbindd_cli_state *state);
 416         const char *winbindd_cmd_name;
 417 };
 418
 419 static struct winbindd_child_dispatch_table child_dispatch_table[] = {
 420
 421         { WINBINDD_LOOKUPSID,            winbindd_dual_lookupsid,             "LOOKUPSID" },
 422         { WINBINDD_LOOKUPNAME,           winbindd_dual_lookupname,            "LOOKUPNAME" },
 423         { WINBINDD_LOOKUPRIDS,           winbindd_dual_lookuprids,            "LOOKUPRIDS" },
 424         { WINBINDD_LIST_TRUSTDOM,        winbindd_dual_list_trusted_domains,  "LIST_TRUSTDOM" },
 425         { WINBINDD_INIT_CONNECTION,      winbindd_dual_init_connection,       "INIT_CONNECTION" },
 426         { WINBINDD_GETDCNAME,            winbindd_dual_getdcname,             "GETDCNAME" },
 427         { WINBINDD_SHOW_SEQUENCE,        winbindd_dual_show_sequence,         "SHOW_SEQUENCE" },
 428         { WINBINDD_PAM_AUTH,             winbindd_dual_pam_auth,              "PAM_AUTH" },
 429         { WINBINDD_PAM_AUTH_CRAP,        winbindd_dual_pam_auth_crap,         "AUTH_CRAP" },
 430         { WINBINDD_PAM_LOGOFF,           winbindd_dual_pam_logoff,            "PAM_LOGOFF" },
 431         { WINBINDD_PAM_CHNG_PSWD_AUTH_CRAP,winbindd_dual_pam_chng_pswd_auth_crap,"CHNG_PSWD_AUTH_CRAP" },
 432         { WINBINDD_PAM_CHAUTHTOK,        winbindd_dual_pam_chauthtok,         "PAM_CHAUTHTOK" },
 433         { WINBINDD_CHECK_MACHACC,        winbindd_dual_check_machine_acct,    "CHECK_MACHACC" },
 434         { WINBINDD_DUAL_SID2UID,         winbindd_dual_sid2uid,               "DUAL_SID2UID" },
 435         { WINBINDD_DUAL_SID2GID,         winbindd_dual_sid2gid,               "DUAL_SID2GID" },
 436 #if 0   /* DISABLED until we fix the interface in Samba 3.0.26 --jerry */
 437         { WINBINDD_DUAL_SIDS2XIDS,       winbindd_dual_sids2xids,             "DUAL_SIDS2XIDS" },
 438 #endif  /* end DISABLED */
 439         { WINBINDD_DUAL_UID2SID,         winbindd_dual_uid2sid,               "DUAL_UID2SID" },
 440         { WINBINDD_DUAL_GID2SID,         winbindd_dual_gid2sid,               "DUAL_GID2SID" },
 441         { WINBINDD_DUAL_UID2NAME,        winbindd_dual_uid2name,              "DUAL_UID2NAME" },
 442         { WINBINDD_DUAL_NAME2UID,        winbindd_dual_name2uid,              "DUAL_NAME2UID" },
 443         { WINBINDD_DUAL_GID2NAME,        winbindd_dual_gid2name,              "DUAL_GID2NAME" },
 444         { WINBINDD_DUAL_NAME2GID,        winbindd_dual_name2gid,              "DUAL_NAME2GID" },
 445         { WINBINDD_DUAL_SET_MAPPING,     winbindd_dual_set_mapping,           "DUAL_SET_MAPPING" },
 446         { WINBINDD_DUAL_SET_HWM,         winbindd_dual_set_hwm,               "DUAL_SET_HWMS" },
 447         { WINBINDD_DUAL_DUMP_MAPS,       winbindd_dual_dump_maps,             "DUAL_DUMP_MAPS" },
 448         { WINBINDD_DUAL_USERINFO,        winbindd_dual_userinfo,              "DUAL_USERINFO" },
 449         { WINBINDD_ALLOCATE_UID,         winbindd_dual_allocate_uid,          "ALLOCATE_UID" },
 450         { WINBINDD_ALLOCATE_GID,         winbindd_dual_allocate_gid,          "ALLOCATE_GID" },
 451         { WINBINDD_GETUSERDOMGROUPS,     winbindd_dual_getuserdomgroups,      "GETUSERDOMGROUPS" },
 452         { WINBINDD_DUAL_GETSIDALIASES,   winbindd_dual_getsidaliases,         "GETSIDALIASES" },
 453         { WINBINDD_CCACHE_NTLMAUTH,      winbindd_dual_ccache_ntlm_auth,      "CCACHE_NTLM_AUTH" },
 454         /* End of list */
 455
 456         { WINBINDD_NUM_CMDS, NULL, "NONE" }
 457 };
 458
 459 static void child_process_request(struct winbindd_domain *domain,
 460                                   struct winbindd_cli_state *state)
 461 {
 462         struct winbindd_child_dispatch_table *table;
 463
 464         /* Free response data - we may be interrupted and receive another
 465            command before being able to send this data off. */
 466
 467         state->response.result = WINBINDD_ERROR;
 468         state->response.length = sizeof(struct winbindd_response);
 469
 470         state->mem_ctx = talloc_init("winbind request");
 471         if (state->mem_ctx == NULL)
 472                 return;
 473
 474         /* Process command */
 475
 476         for (table = child_dispatch_table; table->fn; table++) {
 477                 if (state->request.cmd == table->cmd) {
 478                         DEBUG(10,("process_request: request fn %s\n",
 479                                   table->winbindd_cmd_name ));
 480                         state->response.result = table->fn(domain, state);
 481                         break;
 482                 }
 483         }
 484
 485         if (!table->fn) {
 486                 DEBUG(10,("process_request: unknown request fn number %d\n",
 487                           (int)state->request.cmd ));
 488                 state->response.result = WINBINDD_ERROR;
 489         }
 490
 491         talloc_destroy(state->mem_ctx);
 492 }
 493
 494 void setup_domain_child(struct winbindd_domain *domain,
 495                         struct winbindd_child *child,
 496                         const char *explicit_logfile)
 497 {
 498         if (explicit_logfile != NULL) {
 499                 pstr_sprintf(child->logfilename, "%s/log.winbindd-%s",
 500                              dyn_LOGFILEBASE, explicit_logfile);
 501         } else if (domain != NULL) {
 502                 pstr_sprintf(child->logfilename, "%s/log.wb-%s",
 503                              dyn_LOGFILEBASE, domain->name);
 504         } else {
 505                 smb_panic("Internal error: domain == NULL && "
 506                           "explicit_logfile == NULL");
 507         }
 508
 509         child->domain = domain;
 510 }
 511
 512 struct winbindd_child *children = NULL;
 513
 514 void winbind_child_died(pid_t pid)
 515 {
 516         struct winbindd_child *child;
 517
 518         for (child = children; child != NULL; child = child->next) {
 519                 if (child->pid == pid) {
 520                         break;
 521                 }
 522         }
 523
 524         if (child == NULL) {
 525                 DEBUG(5, ("Already reaped child %u died\n", (unsigned int)pid));
 526                 return;
 527         }
 528
 529         remove_fd_event(&child->event);
 530         close(child->event.fd);
 531         child->event.fd = 0;
 532         child->event.flags = 0;
 533         child->pid = 0;
 534
 535         schedule_async_request(child);
 536 }
 537
 538 /* Ensure any negative cache entries with the netbios or realm names are removed. */
 539
 540 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
 541 {
 542         flush_negative_conn_cache_for_domain(domain->name);
 543         if (*domain->alt_name) {
 544                 flush_negative_conn_cache_for_domain(domain->alt_name);
 545         }
 546 }
 547
 548 /* Set our domains as offline and forward the offline message to our children. */
 549
 550 void winbind_msg_offline(struct messaging_context *msg_ctx,
 551                          void *private_data,
 552                          uint32_t msg_type,
 553                          struct server_id server_id,
 554                          DATA_BLOB *data)
 555 {
 556         struct winbindd_child *child;
 557         struct winbindd_domain *domain;
 558
 559         DEBUG(10,("winbind_msg_offline: got offline message.\n"));
 560
 561         if (!lp_winbind_offline_logon()) {
 562                 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
 563                 return;
 564         }
 565
 566         /* Set our global state as offline. */
 567         if (!set_global_winbindd_state_offline()) {
 568                 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
 569                 return;
 570         }
 571
 572         /* Set all our domains as offline. */
 573         for (domain = domain_list(); domain; domain = domain->next) {
 574                 if (domain->internal) {
 575                         continue;
 576                 }
 577                 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
 578                 set_domain_offline(domain);
 579         }
 580
 581         for (child = children; child != NULL; child = child->next) {
 582                 /* Don't send message to idmap child.  We've already
 583                    done so above. */
 584                 if (!child->domain || (child == idmap_child())) {
 585                         continue;
 586                 }
 587
 588                 /* Or internal domains (this should not be possible....) */
 589                 if (child->domain->internal) {
 590                         continue;
 591                 }
 592
 593                 /* Each winbindd child should only process requests for one domain - make sure
 594                    we only set it online / offline for that domain. */
 595
 596                 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
 597                         (unsigned int)child->pid, domain->name ));
 598
 599                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 600                                    MSG_WINBIND_OFFLINE,
 601                                    (uint8 *)child->domain->name,
 602                                    strlen(child->domain->name)+1);
 603         }
 604 }
 605
 606 /* Set our domains as online and forward the online message to our children. */
 607
 608 void winbind_msg_online(struct messaging_context *msg_ctx,
 609                         void *private_data,
 610                         uint32_t msg_type,
 611                         struct server_id server_id,
 612                         DATA_BLOB *data)
 613 {
 614         struct winbindd_child *child;
 615         struct winbindd_domain *domain;
 616
 617         DEBUG(10,("winbind_msg_online: got online message.\n"));
 618
 619         if (!lp_winbind_offline_logon()) {
 620                 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
 621                 return;
 622         }
 623
 624         /* Set our global state as online. */
 625         set_global_winbindd_state_online();
 626
 627         smb_nscd_flush_user_cache();
 628         smb_nscd_flush_group_cache();
 629
 630         /* Set all our domains as online. */
 631         for (domain = domain_list(); domain; domain = domain->next) {
 632                 if (domain->internal) {
 633                         continue;
 634                 }
 635                 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
 636
 637                 winbindd_flush_negative_conn_cache(domain);
 638                 set_domain_online_request(domain);
 639
 640                 /* Send an online message to the idmap child when our
 641                    primary domain comes back online */
 642
 643                 if ( domain->primary ) {
 644                         struct winbindd_child *idmap = idmap_child();
 645
 646                         if ( idmap->pid != 0 ) {
 647                                 messaging_send_buf(msg_ctx,
 648                                                    pid_to_procid(idmap->pid),
 649                                                    MSG_WINBIND_ONLINE,
 650                                                    (uint8 *)domain->name,
 651                                                    strlen(domain->name)+1);
 652                         }
 653
 654                 }
 655         }
 656
 657         for (child = children; child != NULL; child = child->next) {
 658                 /* Don't send message to idmap child. */
 659                 if (!child->domain || (child == idmap_child())) {
 660                         continue;
 661                 }
 662
 663                 /* Or internal domains (this should not be possible....) */
 664                 if (child->domain->internal) {
 665                         continue;
 666                 }
 667
 668                 /* Each winbindd child should only process requests for one domain - make sure
 669                    we only set it online / offline for that domain. */
 670
 671                 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
 672                         (unsigned int)child->pid, child->domain->name ));
 673
 674                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 675                                    MSG_WINBIND_ONLINE,
 676                                    (uint8 *)child->domain->name,
 677                                    strlen(child->domain->name)+1);
 678         }
 679 }
 680
 681 /* Forward the online/offline messages to our children. */
 682 void winbind_msg_onlinestatus(struct messaging_context *msg_ctx,
 683                               void *private_data,
 684                               uint32_t msg_type,
 685                               struct server_id server_id,
 686                               DATA_BLOB *data)
 687 {
 688         struct winbindd_child *child;
 689
 690         DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
 691
 692         for (child = children; child != NULL; child = child->next) {
 693                 if (child->domain && child->domain->primary) {
 694                         DEBUG(10,("winbind_msg_onlinestatus: "
 695                                   "sending message to pid %u of primary domain.\n",
 696                                   (unsigned int)child->pid));
 697                         messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 698                                            MSG_WINBIND_ONLINESTATUS,
 699                                            (uint8 *)data->data,
 700                                            data->length);
 701                         break;
 702                 }
 703         }
 704 }
 705
 706 void winbind_msg_dump_event_list(struct messaging_context *msg_ctx,
 707                                  void *private_data,
 708                                  uint32_t msg_type,
 709                                  struct server_id server_id,
 710                                  DATA_BLOB *data)
 711 {
 712         struct winbindd_child *child;
 713
 714         DEBUG(10,("winbind_msg_dump_event_list received\n"));
 715
 716         dump_event_list(winbind_event_context());
 717
 718         for (child = children; child != NULL; child = child->next) {
 719
 720                 DEBUG(10,("winbind_msg_dump_event_list: sending message to pid %u\n",
 721                         (unsigned int)child->pid));
 722
 723                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 724                                    MSG_DUMP_EVENT_LIST,
 725                                    NULL, 0);
 726         }
 727
 728 }
 729
 730 static void account_lockout_policy_handler(struct event_context *ctx,
 731                                            struct timed_event *te,
 732                                            const struct timeval *now,
 733                                            void *private_data)
 734 {
 735         struct winbindd_child *child =
 736                 (struct winbindd_child *)private_data;
 737         TALLOC_CTX *mem_ctx = NULL;
 738         struct winbindd_methods *methods;
 739         SAM_UNK_INFO_12 lockout_policy;
 740         NTSTATUS result;
 741
 742         DEBUG(10,("account_lockout_policy_handler called\n"));
 743
 744         TALLOC_FREE(child->lockout_policy_event);
 745
 746         if ( !winbindd_can_contact_domain( child->domain ) ) {
 747                 DEBUG(10,("account_lockout_policy_handler: Removing myself since I "
 748                           "do not have an incoming trust to domain %s\n",
 749                           child->domain->name));
 750
 751                 return;
 752         }
 753
 754         methods = child->domain->methods;
 755
 756         mem_ctx = talloc_init("account_lockout_policy_handler ctx");
 757         if (!mem_ctx) {
 758                 result = NT_STATUS_NO_MEMORY;
 759         } else {
 760                 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
 761         }
 762
 763         talloc_destroy(mem_ctx);
 764
 765         if (!NT_STATUS_IS_OK(result)) {
 766                 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
 767                          nt_errstr(result)));
 768         }
 769
 770         child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
 771                                                       timeval_current_ofs(3600, 0),
 772                                                       "account_lockout_policy_handler",
 773                                                       account_lockout_policy_handler,
 774                                                       child);
 775 }
 776
 777 /* Deal with a request to go offline. */
 778
 779 static void child_msg_offline(struct messaging_context *msg,
 780                               void *private_data,
 781                               uint32_t msg_type,
 782                               struct server_id server_id,
 783                               DATA_BLOB *data)
 784 {
 785         struct winbindd_domain *domain;
 786         const char *domainname = (const char *)data->data;
 787
 788         if (data->data == NULL || data->length == 0) {
 789                 return;
 790         }
 791
 792         DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
 793
 794         if (!lp_winbind_offline_logon()) {
 795                 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
 796                 return;
 797         }
 798
 799         /* Mark the requested domain offline. */
 800
 801         for (domain = domain_list(); domain; domain = domain->next) {
 802                 if (domain->internal) {
 803                         continue;
 804                 }
 805                 if (strequal(domain->name, domainname)) {
 806                         DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
 807                         set_domain_offline(domain);
 808                 }
 809         }
 810 }
 811
 812 /* Deal with a request to go online. */
 813
 814 static void child_msg_online(struct messaging_context *msg,
 815                              void *private_data,
 816                              uint32_t msg_type,
 817                              struct server_id server_id,
 818                              DATA_BLOB *data)
 819 {
 820         struct winbindd_domain *domain;
 821         const char *domainname = (const char *)data->data;
 822
 823         if (data->data == NULL || data->length == 0) {
 824                 return;
 825         }
 826
 827         DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
 828
 829         if (!lp_winbind_offline_logon()) {
 830                 DEBUG(10,("child_msg_online: rejecting online message.\n"));
 831                 return;
 832         }
 833
 834         /* Set our global state as online. */
 835         set_global_winbindd_state_online();
 836
 837         /* Try and mark everything online - delete any negative cache entries
 838            to force a reconnect now. */
 839
 840         for (domain = domain_list(); domain; domain = domain->next) {
 841                 if (domain->internal) {
 842                         continue;
 843                 }
 844                 if (strequal(domain->name, domainname)) {
 845                         DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
 846                         winbindd_flush_negative_conn_cache(domain);
 847                         set_domain_online_request(domain);
 848                 }
 849         }
 850 }
 851
 852 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
 853 {
 854         struct winbindd_domain *domain;
 855         char *buf = NULL;
 856
 857         if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
 858                                    get_global_winbindd_state_offline() ?
 859                                    "Offline":"Online")) == NULL) {
 860                 return NULL;
 861         }
 862
 863         for (domain = domain_list(); domain; domain = domain->next) {
 864                 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
 865                                                   domain->name,
 866                                                   domain->online ?
 867                                                   "Online":"Offline")) == NULL) {
 868                         return NULL;
 869                 }
 870         }
 871
 872         buf = talloc_asprintf_append(buf, "\n");
 873
 874         DEBUG(5,("collect_onlinestatus: %s", buf));
 875
 876         return buf;
 877 }
 878
 879 static void child_msg_onlinestatus(struct messaging_context *msg_ctx,
 880                                    void *private_data,
 881                                    uint32_t msg_type,
 882                                    struct server_id server_id,
 883                                    DATA_BLOB *data)
 884 {
 885         TALLOC_CTX *mem_ctx;
 886         const char *message;
 887         struct server_id *sender;
 888
 889         DEBUG(5,("winbind_msg_onlinestatus received.\n"));
 890
 891         if (!data->data) {
 892                 return;
 893         }
 894
 895         sender = (struct server_id *)data->data;
 896
 897         mem_ctx = talloc_init("winbind_msg_onlinestatus");
 898         if (mem_ctx == NULL) {
 899                 return;
 900         }
 901
 902         message = collect_onlinestatus(mem_ctx);
 903         if (message == NULL) {
 904                 talloc_destroy(mem_ctx);
 905                 return;
 906         }
 907
 908         messaging_send_buf(msg_ctx, *sender, MSG_WINBIND_ONLINESTATUS,
 909                            (uint8 *)message, strlen(message) + 1);
 910
 911         talloc_destroy(mem_ctx);
 912 }
 913
 914 static void child_msg_dump_event_list(struct messaging_context *msg,
 915                                       void *private_data,
 916                                       uint32_t msg_type,
 917                                       struct server_id server_id,
 918                                       DATA_BLOB *data)
 919 {
 920         DEBUG(5,("child_msg_dump_event_list received\n"));
 921
 922         dump_event_list(winbind_event_context());
 923 }
 924
 925
 926 static BOOL fork_domain_child(struct winbindd_child *child)
 927 {
 928         int fdpair[2];
 929         struct winbindd_cli_state state;
 930         struct winbindd_domain *domain;
 931
 932         if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
 933                 DEBUG(0, ("Could not open child pipe: %s\n",
 934                           strerror(errno)));
 935                 return False;
 936         }
 937
 938         ZERO_STRUCT(state);
 939         state.pid = sys_getpid();
 940
 941         /* Stop zombies */
 942         CatchChild();
 943
 944         child->pid = sys_fork();
 945
 946         if (child->pid == -1) {
 947                 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
 948                 return False;
 949         }
 950
 951         if (child->pid != 0) {
 952                 /* Parent */
 953                 close(fdpair[0]);
 954                 child->next = child->prev = NULL;
 955                 DLIST_ADD(children, child);
 956                 child->event.fd = fdpair[1];
 957                 child->event.flags = 0;
 958                 child->requests = NULL;
 959                 add_fd_event(&child->event);
 960                 return True;
 961         }
 962
 963         /* Child */
 964
 965         state.sock = fdpair[0];
 966         close(fdpair[1]);
 967
 968         /* tdb needs special fork handling */
 969         if (tdb_reopen_all(1) == -1) {
 970                 DEBUG(0,("tdb_reopen_all failed.\n"));
 971                 _exit(0);
 972         }
 973
 974         close_conns_after_fork();
 975
 976         if (!override_logfile) {
 977                 lp_set_logfile(child->logfilename);
 978                 reopen_logs();
 979         }
 980
 981         /*
 982          * For clustering, we need to re-init our ctdbd connection after the
 983          * fork
 984          */
 985         if (!NT_STATUS_IS_OK(messaging_reinit(winbind_messaging_context())))
 986                 exit(1);
 987
 988         /* Don't handle the same messages as our parent. */
 989         messaging_deregister(winbind_messaging_context(),
 990                              MSG_SMB_CONF_UPDATED, NULL);
 991         messaging_deregister(winbind_messaging_context(),
 992                              MSG_SHUTDOWN, NULL);
 993         messaging_deregister(winbind_messaging_context(),
 994                              MSG_WINBIND_OFFLINE, NULL);
 995         messaging_deregister(winbind_messaging_context(),
 996                              MSG_WINBIND_ONLINE, NULL);
 997         messaging_deregister(winbind_messaging_context(),
 998                              MSG_WINBIND_ONLINESTATUS, NULL);
 999         messaging_deregister(winbind_messaging_context(),
1000                              MSG_DUMP_EVENT_LIST, NULL);
1001
1002         /* Handle online/offline messages. */
1003         messaging_register(winbind_messaging_context(), NULL,
1004                            MSG_WINBIND_OFFLINE, child_msg_offline);
1005         messaging_register(winbind_messaging_context(), NULL,
1006                            MSG_WINBIND_ONLINE, child_msg_online);
1007         messaging_register(winbind_messaging_context(), NULL,
1008                            MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus);
1009         messaging_register(winbind_messaging_context(), NULL,
1010                            MSG_DUMP_EVENT_LIST, child_msg_dump_event_list);
1011
1012         if ( child->domain ) {
1013                 child->domain->startup = True;
1014                 child->domain->startup_time = time(NULL);
1015         }
1016
1017         /* Ensure we have no pending check_online events other
1018            than one for this domain. */
1019
1020         for (domain = domain_list(); domain; domain = domain->next) {
1021                 if (domain != child->domain) {
1022                         TALLOC_FREE(domain->check_online_event);
1023                 }
1024         }
1025
1026         /* Ensure we're not handling an event inherited from
1027            our parent. */
1028
1029         cancel_named_event(winbind_event_context(),
1030                            "krb5_ticket_refresh_handler");
1031
1032         /* We might be in the idmap child...*/
1033         if (child->domain && !(child->domain->internal) &&
1034             lp_winbind_offline_logon()) {
1035
1036                 set_domain_online_request(child->domain);
1037
1038                 child->lockout_policy_event = event_add_timed(
1039                         winbind_event_context(), NULL, timeval_zero(),
1040                         "account_lockout_policy_handler",
1041                         account_lockout_policy_handler,
1042                         child);
1043         }
1044
1045         while (1) {
1046
1047                 int ret;
1048                 fd_set read_fds;
1049                 struct timeval t;
1050                 struct timeval *tp;
1051                 struct timeval now;
1052
1053                 /* free up any talloc memory */
1054                 lp_TALLOC_FREE();
1055                 main_loop_TALLOC_FREE();
1056
1057                 run_events(winbind_event_context(), 0, NULL, NULL);
1058
1059                 GetTimeOfDay(&now);
1060
1061                 if (child->domain && child->domain->startup &&
1062                                 (now.tv_sec > child->domain->startup_time + 30)) {
1063                         /* No longer in "startup" mode. */
1064                         DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1065                                 child->domain->name ));
1066                         child->domain->startup = False;
1067                 }
1068
1069                 tp = get_timed_events_timeout(winbind_event_context(), &t);
1070                 if (tp) {
1071                         DEBUG(11,("select will use timeout of %u.%u seconds\n",
1072                                 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1073                 }
1074
1075                 /* Handle messages */
1076
1077                 message_dispatch(winbind_messaging_context());
1078
1079                 FD_ZERO(&read_fds);
1080                 FD_SET(state.sock, &read_fds);
1081
1082                 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
1083
1084                 if (ret == 0) {
1085                         DEBUG(11,("nothing is ready yet, continue\n"));
1086                         continue;
1087                 }
1088
1089                 if (ret == -1 && errno == EINTR) {
1090                         /* We got a signal - continue. */
1091                         continue;
1092                 }
1093
1094                 if (ret == -1 && errno != EINTR) {
1095                         DEBUG(0,("select error occured\n"));
1096                         perror("select");
1097                         return False;
1098                 }
1099
1100                 /* fetch a request from the main daemon */
1101                 child_read_request(&state);
1102
1103                 if (state.finished) {
1104                         /* we lost contact with our parent */
1105                         exit(0);
1106                 }
1107
1108                 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
1109
1110                 ZERO_STRUCT(state.response);
1111                 state.request.null_term = '\0';
1112                 child_process_request(child->domain, &state);
1113
1114                 SAFE_FREE(state.request.extra_data.data);
1115
1116                 cache_store_response(sys_getpid(), &state.response);
1117
1118                 SAFE_FREE(state.response.extra_data.data);
1119
1120                 /* We just send the result code back, the result
1121                  * structure needs to be fetched via the
1122                  * winbindd_cache. Hmm. That needs fixing... */
1123
1124                 if (write_data(state.sock,
1125                                (const char *)&state.response.result,
1126                                sizeof(state.response.result)) !=
1127                     sizeof(state.response.result)) {
1128                         DEBUG(0, ("Could not write result\n"));
1129                         exit(1);
1130                 }
1131         }
1132 }