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[GLUE] Rsync SAMBA_3_0 SVN r25598 in order to create the v3-0-test branch.
[Samba.git] / source / nsswitch / winbindd_dual.c
blobffbedfa9bf204655d21ee460cc56befdf46258b4
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 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(int msg_type, struct process_id src,
551 void *buf, size_t len, void *private_data)
552 {
553 struct winbindd_child *child;
554 struct winbindd_domain *domain;
555
556 DEBUG(10,("winbind_msg_offline: got offline message.\n"));
557
558 if (!lp_winbind_offline_logon()) {
559 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
560 return;
561 }
562
563 /* Set our global state as offline. */
564 if (!set_global_winbindd_state_offline()) {
565 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
566 return;
567 }
568
569 /* Set all our domains as offline. */
570 for (domain = domain_list(); domain; domain = domain->next) {
571 if (domain->internal) {
572 continue;
573 }
574 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
575 set_domain_offline(domain);
576
577 /* Send an offline message to the idmap child when our
578 primary domain goes offline */
579
580 if ( domain->primary ) {
581 struct winbindd_child *idmap = idmap_child();
582
583 if ( idmap->pid != 0 ) {
584 message_send_pid(pid_to_procid(idmap->pid),
585 MSG_WINBIND_OFFLINE,
586 domain->name,
587 strlen(domain->name)+1,
588 False);
589 }
590 }
591 }
592
593 for (child = children; child != NULL; child = child->next) {
594 /* Don't send message to idmap child. We've already
595 done so above. */
596 if (!child->domain || (child == idmap_child())) {
597 continue;
598 }
599
600 /* Or internal domains (this should not be possible....) */
601 if (child->domain->internal) {
602 continue;
603 }
604
605 /* Each winbindd child should only process requests for one domain - make sure
606 we only set it online / offline for that domain. */
607
608 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
609 (unsigned int)child->pid, domain->name ));
610
611 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_OFFLINE, child->domain->name,
612 strlen(child->domain->name)+1, False);
613 }
614 }
615
616 /* Set our domains as online and forward the online message to our children. */
617
618 void winbind_msg_online(int msg_type, struct process_id src,
619 void *buf, size_t len, void *private_data)
620 {
621 struct winbindd_child *child;
622 struct winbindd_domain *domain;
623
624 DEBUG(10,("winbind_msg_online: got online message.\n"));
625
626 if (!lp_winbind_offline_logon()) {
627 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
628 return;
629 }
630
631 /* Set our global state as online. */
632 set_global_winbindd_state_online();
633
634 smb_nscd_flush_user_cache();
635 smb_nscd_flush_group_cache();
636
637 /* Set all our domains as online. */
638 for (domain = domain_list(); domain; domain = domain->next) {
639 if (domain->internal) {
640 continue;
641 }
642 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
643
644 winbindd_flush_negative_conn_cache(domain);
645 set_domain_online_request(domain);
646
647 /* Send an online message to the idmap child when our
648 primary domain comes back online */
649
650 if ( domain->primary ) {
651 struct winbindd_child *idmap = idmap_child();
652
653 if ( idmap->pid != 0 ) {
654 message_send_pid(pid_to_procid(idmap->pid),
655 MSG_WINBIND_ONLINE,
656 domain->name,
657 strlen(domain->name)+1,
658 False);
659 }
660
661 }
662 }
663
664 for (child = children; child != NULL; child = child->next) {
665 /* Don't send message to idmap child. */
666 if (!child->domain || (child == idmap_child())) {
667 continue;
668 }
669
670 /* Or internal domains (this should not be possible....) */
671 if (child->domain->internal) {
672 continue;
673 }
674
675 /* Each winbindd child should only process requests for one domain - make sure
676 we only set it online / offline for that domain. */
677
678 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
679 (unsigned int)child->pid, child->domain->name ));
680
681 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_ONLINE, child->domain->name,
682 strlen(child->domain->name)+1, False);
683 }
684 }
685
686 /* Forward the online/offline messages to our children. */
687 void winbind_msg_onlinestatus(int msg_type, struct process_id src,
688 void *buf, size_t len, void *private_data)
689 {
690 struct winbindd_child *child;
691
692 DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
693
694 for (child = children; child != NULL; child = child->next) {
695 if (child->domain && child->domain->primary) {
696 DEBUG(10,("winbind_msg_onlinestatus: "
697 "sending message to pid %u of primary domain.\n",
698 (unsigned int)child->pid));
699 message_send_pid(pid_to_procid(child->pid),
700 MSG_WINBIND_ONLINESTATUS, buf, len, False);
701 break;
702 }
703 }
704 }
705
706
707 static void account_lockout_policy_handler(struct event_context *ctx,
708 struct timed_event *te,
709 const struct timeval *now,
710 void *private_data)
711 {
712 struct winbindd_child *child =
713 (struct winbindd_child *)private_data;
714 TALLOC_CTX *mem_ctx = NULL;
715 struct winbindd_methods *methods;
716 SAM_UNK_INFO_12 lockout_policy;
717 NTSTATUS result;
718
719 DEBUG(10,("account_lockout_policy_handler called\n"));
720
721 TALLOC_FREE(child->lockout_policy_event);
722
723 methods = child->domain->methods;
724
725 mem_ctx = talloc_init("account_lockout_policy_handler ctx");
726 if (!mem_ctx) {
727 result = NT_STATUS_NO_MEMORY;
728 } else {
729 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
730 }
731
732 talloc_destroy(mem_ctx);
733
734 if (!NT_STATUS_IS_OK(result)) {
735 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
736 nt_errstr(result)));
737 }
738
739 child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
740 timeval_current_ofs(3600, 0),
741 "account_lockout_policy_handler",
742 account_lockout_policy_handler,
743 child);
744 }
745
746 /* Deal with a request to go offline. */
747
748 static void child_msg_offline(int msg_type, struct process_id src,
749 void *buf, size_t len, void *private_data)
750 {
751 struct winbindd_domain *domain;
752 const char *domainname = (const char *)buf;
753
754 if (buf == NULL || len == 0) {
755 return;
756 }
757
758 DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
759
760 if (!lp_winbind_offline_logon()) {
761 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
762 return;
763 }
764
765 /* Set our global state as offline. */
766 if (!set_global_winbindd_state_offline()) {
767 DEBUG(10,("child_msg_offline: offline request failed.\n"));
768 return;
769 }
770
771 /* Mark the requested domain offline. */
772
773 for (domain = domain_list(); domain; domain = domain->next) {
774 if (domain->internal) {
775 continue;
776 }
777 if (strequal(domain->name, domainname)) {
778 DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
779 set_domain_offline(domain);
780 }
781 }
782 }
783
784 /* Deal with a request to go online. */
785
786 static void child_msg_online(int msg_type, struct process_id src,
787 void *buf, size_t len, void *private_data)
788 {
789 struct winbindd_domain *domain;
790 const char *domainname = (const char *)buf;
791
792 if (buf == NULL || len == 0) {
793 return;
794 }
795
796 DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
797
798 if (!lp_winbind_offline_logon()) {
799 DEBUG(10,("child_msg_online: rejecting online message.\n"));
800 return;
801 }
802
803 /* Set our global state as online. */
804 set_global_winbindd_state_online();
805
806 /* Try and mark everything online - delete any negative cache entries
807 to force a reconnect now. */
808
809 for (domain = domain_list(); domain; domain = domain->next) {
810 if (domain->internal) {
811 continue;
812 }
813 if (strequal(domain->name, domainname)) {
814 DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
815 winbindd_flush_negative_conn_cache(domain);
816 set_domain_online_request(domain);
817 }
818 }
819 }
820
821 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
822 {
823 struct winbindd_domain *domain;
824 char *buf = NULL;
825
826 if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
827 get_global_winbindd_state_offline() ?
828 "Offline":"Online")) == NULL) {
829 return NULL;
830 }
831
832 for (domain = domain_list(); domain; domain = domain->next) {
833 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
834 domain->name,
835 domain->online ?
836 "Online":"Offline")) == NULL) {
837 return NULL;
838 }
839 }
840
841 buf = talloc_asprintf_append(buf, "\n");
842
843 DEBUG(5,("collect_onlinestatus: %s", buf));
844
845 return buf;
846 }
847
848 static void child_msg_onlinestatus(int msg_type, struct process_id src,
849 void *buf, size_t len, void *private_data)
850 {
851 TALLOC_CTX *mem_ctx;
852 const char *message;
853 struct process_id *sender;
854
855 DEBUG(5,("winbind_msg_onlinestatus received.\n"));
856
857 if (!buf) {
858 return;
859 }
860
861 sender = (struct process_id *)buf;
862
863 mem_ctx = talloc_init("winbind_msg_onlinestatus");
864 if (mem_ctx == NULL) {
865 return;
866 }
867
868 message = collect_onlinestatus(mem_ctx);
869 if (message == NULL) {
870 talloc_destroy(mem_ctx);
871 return;
872 }
873
874 message_send_pid(*sender, MSG_WINBIND_ONLINESTATUS,
875 message, strlen(message) + 1, True);
876
877 talloc_destroy(mem_ctx);
878 }
879
880 static BOOL fork_domain_child(struct winbindd_child *child)
881 {
882 int fdpair[2];
883 struct winbindd_cli_state state;
884 struct winbindd_domain *domain;
885
886 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
887 DEBUG(0, ("Could not open child pipe: %s\n",
888 strerror(errno)));
889 return False;
890 }
891
892 ZERO_STRUCT(state);
893 state.pid = sys_getpid();
894
895 /* Stop zombies */
896 CatchChild();
897
898 /* Ensure we don't process messages whilst we're
899 changing the disposition for the child. */
900 message_block();
901
902 child->pid = sys_fork();
903
904 if (child->pid == -1) {
905 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
906 message_unblock();
907 return False;
908 }
909
910 if (child->pid != 0) {
911 /* Parent */
912 close(fdpair[0]);
913 child->next = child->prev = NULL;
914 DLIST_ADD(children, child);
915 child->event.fd = fdpair[1];
916 child->event.flags = 0;
917 child->requests = NULL;
918 add_fd_event(&child->event);
919 /* We're ok with online/offline messages now. */
920 message_unblock();
921 return True;
922 }
923
924 /* Child */
925
926 state.sock = fdpair[0];
927 close(fdpair[1]);
928
929 /* tdb needs special fork handling */
930 if (tdb_reopen_all(1) == -1) {
931 DEBUG(0,("tdb_reopen_all failed.\n"));
932 _exit(0);
933 }
934
935 close_conns_after_fork();
936
937 if (!override_logfile) {
938 lp_set_logfile(child->logfilename);
939 reopen_logs();
940 }
941
942 /* Don't handle the same messages as our parent. */
943 message_deregister(MSG_SMB_CONF_UPDATED);
944 message_deregister(MSG_SHUTDOWN);
945 message_deregister(MSG_WINBIND_OFFLINE);
946 message_deregister(MSG_WINBIND_ONLINE);
947 message_deregister(MSG_WINBIND_ONLINESTATUS);
948
949 /* The child is ok with online/offline messages now. */
950 message_unblock();
951
952 /* Handle online/offline messages. */
953 message_register(MSG_WINBIND_OFFLINE, child_msg_offline, NULL);
954 message_register(MSG_WINBIND_ONLINE, child_msg_online, NULL);
955 message_register(MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus,
956 NULL);
957
958 if ( child->domain ) {
959 child->domain->startup = True;
960 child->domain->startup_time = time(NULL);
961 }
962
963 /* Ensure we have no pending check_online events other
964 than one for this domain. */
965
966 for (domain = domain_list(); domain; domain = domain->next) {
967 if (domain != child->domain) {
968 TALLOC_FREE(domain->check_online_event);
969 }
970 }
971
972 /* Ensure we're not handling an event inherited from
973 our parent. */
974
975 cancel_named_event(winbind_event_context(),
976 "krb5_ticket_refresh_handler");
977
978 /* We might be in the idmap child...*/
979 if (child->domain && !(child->domain->internal) &&
980 lp_winbind_offline_logon()) {
981
982 set_domain_online_request(child->domain);
983
984 child->lockout_policy_event = event_add_timed(
985 winbind_event_context(), NULL, timeval_zero(),
986 "account_lockout_policy_handler",
987 account_lockout_policy_handler,
988 child);
989 }
990
991 while (1) {
992
993 int ret;
994 fd_set read_fds;
995 struct timeval t;
996 struct timeval *tp;
997 struct timeval now;
998
999 /* free up any talloc memory */
1000 lp_TALLOC_FREE();
1001 main_loop_TALLOC_FREE();
1002
1003 run_events(winbind_event_context(), 0, NULL, NULL);
1004
1005 GetTimeOfDay(&now);
1006
1007 if (child->domain && child->domain->startup &&
1008 (now.tv_sec > child->domain->startup_time + 30)) {
1009 /* No longer in "startup" mode. */
1010 DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1011 child->domain->name ));
1012 child->domain->startup = False;
1013 }
1014
1015 tp = get_timed_events_timeout(winbind_event_context(), &t);
1016 if (tp) {
1017 DEBUG(11,("select will use timeout of %u.%u seconds\n",
1018 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1019 }
1020
1021 /* Handle messages */
1022
1023 message_dispatch();
1024
1025 FD_ZERO(&read_fds);
1026 FD_SET(state.sock, &read_fds);
1027
1028 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
1029
1030 if (ret == 0) {
1031 DEBUG(11,("nothing is ready yet, continue\n"));
1032 continue;
1033 }
1034
1035 if (ret == -1 && errno == EINTR) {
1036 /* We got a signal - continue. */
1037 continue;
1038 }
1039
1040 if (ret == -1 && errno != EINTR) {
1041 DEBUG(0,("select error occured\n"));
1042 perror("select");
1043 return False;
1044 }
1045
1046 /* fetch a request from the main daemon */
1047 child_read_request(&state);
1048
1049 if (state.finished) {
1050 /* we lost contact with our parent */
1051 exit(0);
1052 }
1053
1054 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
1055
1056 ZERO_STRUCT(state.response);
1057 state.request.null_term = '\0';
1058 child_process_request(child->domain, &state);
1059
1060 SAFE_FREE(state.request.extra_data.data);
1061
1062 cache_store_response(sys_getpid(), &state.response);
1063
1064 SAFE_FREE(state.response.extra_data.data);
1065
1066 /* We just send the result code back, the result
1067 * structure needs to be fetched via the
1068 * winbindd_cache. Hmm. That needs fixing... */
1069
1070 if (write_data(state.sock,
1071 (const char *)&state.response.result,
1072 sizeof(state.response.result)) !=
1073 sizeof(state.response.result)) {
1074 DEBUG(0, ("Could not write result\n"));
1075 exit(1);
1076 }
1077 }
1078 }
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