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Fix bug #5504. winbindd children and parent were handing SIGTERM in the same way...
[Samba.git] / source / nsswitch / winbindd_dual.c
blob7b79734dec4daf13ecc7ed18211e29ff426e67ff
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 /* This will be re-added in fork_domain_child() */
530
531 DLIST_REMOVE(children, child);
532
533 remove_fd_event(&child->event);
534 close(child->event.fd);
535 child->event.fd = 0;
536 child->event.flags = 0;
537 child->pid = 0;
538
539 schedule_async_request(child);
540 }
541
542 /* Ensure any negative cache entries with the netbios or realm names are removed. */
543
544 void winbindd_flush_negative_conn_cache(struct winbindd_domain *domain)
545 {
546 flush_negative_conn_cache_for_domain(domain->name);
547 if (*domain->alt_name) {
548 flush_negative_conn_cache_for_domain(domain->alt_name);
549 }
550 }
551
552 /* Set our domains as offline and forward the offline message to our children. */
553
554 void winbind_msg_offline(int msg_type, struct process_id src,
555 void *buf, size_t len, void *private_data)
556 {
557 struct winbindd_child *child;
558 struct winbindd_domain *domain;
559
560 DEBUG(10,("winbind_msg_offline: got offline message.\n"));
561
562 if (!lp_winbind_offline_logon()) {
563 DEBUG(10,("winbind_msg_offline: rejecting offline message.\n"));
564 return;
565 }
566
567 /* Set our global state as offline. */
568 if (!set_global_winbindd_state_offline()) {
569 DEBUG(10,("winbind_msg_offline: offline request failed.\n"));
570 return;
571 }
572
573 /* Set all our domains as offline. */
574 for (domain = domain_list(); domain; domain = domain->next) {
575 if (domain->internal) {
576 continue;
577 }
578 DEBUG(5,("winbind_msg_offline: marking %s offline.\n", domain->name));
579 set_domain_offline(domain);
580
581 /* Send an offline message to the idmap child when our
582 primary domain goes offline */
583
584 if ( domain->primary ) {
585 struct winbindd_child *idmap = idmap_child();
586
587 if ( idmap->pid != 0 ) {
588 message_send_pid(pid_to_procid(idmap->pid),
589 MSG_WINBIND_OFFLINE,
590 domain->name,
591 strlen(domain->name)+1,
592 False);
593 }
594 }
595 }
596
597 for (child = children; child != NULL; child = child->next) {
598 /* Don't send message to idmap child. We've already
599 done so above. */
600 if (!child->domain || (child == idmap_child())) {
601 continue;
602 }
603
604 /* Or internal domains (this should not be possible....) */
605 if (child->domain->internal) {
606 continue;
607 }
608
609 /* Each winbindd child should only process requests for one domain - make sure
610 we only set it online / offline for that domain. */
611
612 DEBUG(10,("winbind_msg_offline: sending message to pid %u for domain %s.\n",
613 (unsigned int)child->pid, domain->name ));
614
615 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_OFFLINE, child->domain->name,
616 strlen(child->domain->name)+1, False);
617 }
618 }
619
620 /* Set our domains as online and forward the online message to our children. */
621
622 void winbind_msg_online(int msg_type, struct process_id src,
623 void *buf, size_t len, void *private_data)
624 {
625 struct winbindd_child *child;
626 struct winbindd_domain *domain;
627
628 DEBUG(10,("winbind_msg_online: got online message.\n"));
629
630 if (!lp_winbind_offline_logon()) {
631 DEBUG(10,("winbind_msg_online: rejecting online message.\n"));
632 return;
633 }
634
635 /* Set our global state as online. */
636 set_global_winbindd_state_online();
637
638 smb_nscd_flush_user_cache();
639 smb_nscd_flush_group_cache();
640
641 /* Set all our domains as online. */
642 for (domain = domain_list(); domain; domain = domain->next) {
643 if (domain->internal) {
644 continue;
645 }
646 DEBUG(5,("winbind_msg_online: requesting %s to go online.\n", domain->name));
647
648 winbindd_flush_negative_conn_cache(domain);
649 set_domain_online_request(domain);
650
651 /* Send an online message to the idmap child when our
652 primary domain comes back online */
653
654 if ( domain->primary ) {
655 struct winbindd_child *idmap = idmap_child();
656
657 if ( idmap->pid != 0 ) {
658 message_send_pid(pid_to_procid(idmap->pid),
659 MSG_WINBIND_ONLINE,
660 domain->name,
661 strlen(domain->name)+1,
662 False);
663 }
664
665 }
666 }
667
668 for (child = children; child != NULL; child = child->next) {
669 /* Don't send message to idmap child. */
670 if (!child->domain || (child == idmap_child())) {
671 continue;
672 }
673
674 /* Or internal domains (this should not be possible....) */
675 if (child->domain->internal) {
676 continue;
677 }
678
679 /* Each winbindd child should only process requests for one domain - make sure
680 we only set it online / offline for that domain. */
681
682 DEBUG(10,("winbind_msg_online: sending message to pid %u for domain %s.\n",
683 (unsigned int)child->pid, child->domain->name ));
684
685 message_send_pid(pid_to_procid(child->pid), MSG_WINBIND_ONLINE, child->domain->name,
686 strlen(child->domain->name)+1, False);
687 }
688 }
689
690 /* Forward the online/offline messages to our children. */
691 void winbind_msg_onlinestatus(int msg_type, struct process_id src,
692 void *buf, size_t len, void *private_data)
693 {
694 struct winbindd_child *child;
695
696 DEBUG(10,("winbind_msg_onlinestatus: got onlinestatus message.\n"));
697
698 for (child = children; child != NULL; child = child->next) {
699 if (child->domain && child->domain->primary) {
700 DEBUG(10,("winbind_msg_onlinestatus: "
701 "sending message to pid %u of primary domain.\n",
702 (unsigned int)child->pid));
703 message_send_pid(pid_to_procid(child->pid),
704 MSG_WINBIND_ONLINESTATUS, buf, len, False);
705 break;
706 }
707 }
708 }
709
710
711 static void account_lockout_policy_handler(struct event_context *ctx,
712 struct timed_event *te,
713 const struct timeval *now,
714 void *private_data)
715 {
716 struct winbindd_child *child =
717 (struct winbindd_child *)private_data;
718 TALLOC_CTX *mem_ctx = NULL;
719 struct winbindd_methods *methods;
720 SAM_UNK_INFO_12 lockout_policy;
721 NTSTATUS result;
722
723 DEBUG(10,("account_lockout_policy_handler called\n"));
724
725 TALLOC_FREE(child->lockout_policy_event);
726
727 methods = child->domain->methods;
728
729 mem_ctx = talloc_init("account_lockout_policy_handler ctx");
730 if (!mem_ctx) {
731 result = NT_STATUS_NO_MEMORY;
732 } else {
733 result = methods->lockout_policy(child->domain, mem_ctx, &lockout_policy);
734 }
735
736 talloc_destroy(mem_ctx);
737
738 if (!NT_STATUS_IS_OK(result)) {
739 DEBUG(10,("account_lockout_policy_handler: lockout_policy failed error %s\n",
740 nt_errstr(result)));
741 }
742
743 child->lockout_policy_event = event_add_timed(winbind_event_context(), NULL,
744 timeval_current_ofs(3600, 0),
745 "account_lockout_policy_handler",
746 account_lockout_policy_handler,
747 child);
748 }
749
750 /* Deal with a request to go offline. */
751
752 static void child_msg_offline(int msg_type, struct process_id src,
753 void *buf, size_t len, void *private_data)
754 {
755 struct winbindd_domain *domain;
756 const char *domainname = (const char *)buf;
757
758 if (buf == NULL || len == 0) {
759 return;
760 }
761
762 DEBUG(5,("child_msg_offline received for domain %s.\n", domainname));
763
764 if (!lp_winbind_offline_logon()) {
765 DEBUG(10,("child_msg_offline: rejecting offline message.\n"));
766 return;
767 }
768
769 /* Set our global state as offline. */
770 if (!set_global_winbindd_state_offline()) {
771 DEBUG(10,("child_msg_offline: offline request failed.\n"));
772 return;
773 }
774
775 /* Mark the requested domain offline. */
776
777 for (domain = domain_list(); domain; domain = domain->next) {
778 if (domain->internal) {
779 continue;
780 }
781 if (strequal(domain->name, domainname)) {
782 DEBUG(5,("child_msg_offline: marking %s offline.\n", domain->name));
783 set_domain_offline(domain);
784 }
785 }
786 }
787
788 /* Deal with a request to go online. */
789
790 static void child_msg_online(int msg_type, struct process_id src,
791 void *buf, size_t len, void *private_data)
792 {
793 struct winbindd_domain *domain;
794 const char *domainname = (const char *)buf;
795
796 if (buf == NULL || len == 0) {
797 return;
798 }
799
800 DEBUG(5,("child_msg_online received for domain %s.\n", domainname));
801
802 if (!lp_winbind_offline_logon()) {
803 DEBUG(10,("child_msg_online: rejecting online message.\n"));
804 return;
805 }
806
807 /* Set our global state as online. */
808 set_global_winbindd_state_online();
809
810 /* Try and mark everything online - delete any negative cache entries
811 to force a reconnect now. */
812
813 for (domain = domain_list(); domain; domain = domain->next) {
814 if (domain->internal) {
815 continue;
816 }
817 if (strequal(domain->name, domainname)) {
818 DEBUG(5,("child_msg_online: requesting %s to go online.\n", domain->name));
819 winbindd_flush_negative_conn_cache(domain);
820 set_domain_online_request(domain);
821 }
822 }
823 }
824
825 static const char *collect_onlinestatus(TALLOC_CTX *mem_ctx)
826 {
827 struct winbindd_domain *domain;
828 char *buf = NULL;
829
830 if ((buf = talloc_asprintf(mem_ctx, "global:%s ",
831 get_global_winbindd_state_offline() ?
832 "Offline":"Online")) == NULL) {
833 return NULL;
834 }
835
836 for (domain = domain_list(); domain; domain = domain->next) {
837 if ((buf = talloc_asprintf_append(buf, "%s:%s ",
838 domain->name,
839 domain->online ?
840 "Online":"Offline")) == NULL) {
841 return NULL;
842 }
843 }
844
845 buf = talloc_asprintf_append(buf, "\n");
846
847 DEBUG(5,("collect_onlinestatus: %s", buf));
848
849 return buf;
850 }
851
852 static void child_msg_onlinestatus(int msg_type, struct process_id src,
853 void *buf, size_t len, void *private_data)
854 {
855 TALLOC_CTX *mem_ctx;
856 const char *message;
857 struct process_id *sender;
858
859 DEBUG(5,("winbind_msg_onlinestatus received.\n"));
860
861 if (!buf) {
862 return;
863 }
864
865 sender = (struct process_id *)buf;
866
867 mem_ctx = talloc_init("winbind_msg_onlinestatus");
868 if (mem_ctx == NULL) {
869 return;
870 }
871
872 message = collect_onlinestatus(mem_ctx);
873 if (message == NULL) {
874 talloc_destroy(mem_ctx);
875 return;
876 }
877
878 message_send_pid(*sender, MSG_WINBIND_ONLINESTATUS,
879 message, strlen(message) + 1, True);
880
881 talloc_destroy(mem_ctx);
882 }
883
884 static BOOL fork_domain_child(struct winbindd_child *child)
885 {
886 int fdpair[2];
887 struct winbindd_cli_state state;
888 struct winbindd_domain *domain;
889
890 if (socketpair(AF_UNIX, SOCK_STREAM, 0, fdpair) != 0) {
891 DEBUG(0, ("Could not open child pipe: %s\n",
892 strerror(errno)));
893 return False;
894 }
895
896 ZERO_STRUCT(state);
897 state.pid = sys_getpid();
898
899 /* Ensure we don't process messages whilst we're
900 changing the disposition for the child. */
901 message_block();
902
903 child->pid = sys_fork();
904
905 if (child->pid == -1) {
906 DEBUG(0, ("Could not fork: %s\n", strerror(errno)));
907 message_unblock();
908 return False;
909 }
910
911 if (child->pid != 0) {
912 /* Parent */
913 close(fdpair[0]);
914 child->next = child->prev = NULL;
915 DLIST_ADD(children, child);
916 child->event.fd = fdpair[1];
917 child->event.flags = 0;
918 child->requests = NULL;
919 add_fd_event(&child->event);
920 /* We're ok with online/offline messages now. */
921 message_unblock();
922 return True;
923 }
924
925 /* Child */
926
927 /* Stop zombies in children */
928 CatchChild();
929
930 state.sock = fdpair[0];
931 close(fdpair[1]);
932
933 /* tdb needs special fork handling */
934 if (tdb_reopen_all(1) == -1) {
935 DEBUG(0,("tdb_reopen_all failed.\n"));
936 _exit(0);
937 }
938
939 close_conns_after_fork();
940
941 if (!override_logfile) {
942 lp_set_logfile(child->logfilename);
943 reopen_logs();
944 }
945
946 /* Don't handle the same messages as our parent. */
947 message_deregister(MSG_SMB_CONF_UPDATED);
948 message_deregister(MSG_SHUTDOWN);
949 message_deregister(MSG_WINBIND_OFFLINE);
950 message_deregister(MSG_WINBIND_ONLINE);
951 message_deregister(MSG_WINBIND_ONLINESTATUS);
952
953 /* The child is ok with online/offline messages now. */
954 message_unblock();
955
956 /* Handle online/offline messages. */
957 message_register(MSG_WINBIND_OFFLINE, child_msg_offline, NULL);
958 message_register(MSG_WINBIND_ONLINE, child_msg_online, NULL);
959 message_register(MSG_WINBIND_ONLINESTATUS, child_msg_onlinestatus,
960 NULL);
961
962 if ( child->domain ) {
963 child->domain->startup = True;
964 child->domain->startup_time = time(NULL);
965 }
966
967 /* Ensure we have no pending check_online events other
968 than one for this domain. */
969
970 for (domain = domain_list(); domain; domain = domain->next) {
971 if (domain != child->domain) {
972 TALLOC_FREE(domain->check_online_event);
973 }
974 }
975
976 /* Ensure we're not handling an event inherited from
977 our parent. */
978
979 cancel_named_event(winbind_event_context(),
980 "krb5_ticket_refresh_handler");
981
982 /* We might be in the idmap child...*/
983 if (child->domain && !(child->domain->internal) &&
984 lp_winbind_offline_logon()) {
985
986 set_domain_online_request(child->domain);
987
988 child->lockout_policy_event = event_add_timed(
989 winbind_event_context(), NULL, timeval_zero(),
990 "account_lockout_policy_handler",
991 account_lockout_policy_handler,
992 child);
993 }
994
995 while (1) {
996
997 int ret;
998 fd_set read_fds;
999 struct timeval t;
1000 struct timeval *tp;
1001 struct timeval now;
1002
1003 /* free up any talloc memory */
1004 lp_TALLOC_FREE();
1005 main_loop_TALLOC_FREE();
1006
1007 /* check for signals */
1008 winbind_check_sigterm(false);
1009 winbind_check_sighup();
1010
1011 run_events(winbind_event_context(), 0, NULL, NULL);
1012
1013 GetTimeOfDay(&now);
1014
1015 if (child->domain && child->domain->startup &&
1016 (now.tv_sec > child->domain->startup_time + 30)) {
1017 /* No longer in "startup" mode. */
1018 DEBUG(10,("fork_domain_child: domain %s no longer in 'startup' mode.\n",
1019 child->domain->name ));
1020 child->domain->startup = False;
1021 }
1022
1023 tp = get_timed_events_timeout(winbind_event_context(), &t);
1024 if (tp) {
1025 DEBUG(11,("select will use timeout of %u.%u seconds\n",
1026 (unsigned int)tp->tv_sec, (unsigned int)tp->tv_usec ));
1027 }
1028
1029 /* Handle messages */
1030
1031 message_dispatch();
1032
1033 FD_ZERO(&read_fds);
1034 FD_SET(state.sock, &read_fds);
1035
1036 ret = sys_select(state.sock + 1, &read_fds, NULL, NULL, tp);
1037
1038 if (ret == 0) {
1039 DEBUG(11,("nothing is ready yet, continue\n"));
1040 continue;
1041 }
1042
1043 if (ret == -1 && errno == EINTR) {
1044 /* We got a signal - continue. */
1045 continue;
1046 }
1047
1048 if (ret == -1 && errno != EINTR) {
1049 DEBUG(0,("select error occured\n"));
1050 perror("select");
1051 return False;
1052 }
1053
1054 /* fetch a request from the main daemon */
1055 child_read_request(&state);
1056
1057 if (state.finished) {
1058 /* we lost contact with our parent */
1059 exit(0);
1060 }
1061
1062 DEBUG(4,("child daemon request %d\n", (int)state.request.cmd));
1063
1064 ZERO_STRUCT(state.response);
1065 state.request.null_term = '\0';
1066 child_process_request(child->domain, &state);
1067
1068 SAFE_FREE(state.request.extra_data.data);
1069
1070 cache_store_response(sys_getpid(), &state.response);
1071
1072 SAFE_FREE(state.response.extra_data.data);
1073
1074 /* We just send the result code back, the result
1075 * structure needs to be fetched via the
1076 * winbindd_cache. Hmm. That needs fixing... */
1077
1078 if (write_data(state.sock,
1079 (const char *)&state.response.result,
1080 sizeof(state.response.result)) !=
1081 sizeof(state.response.result)) {
1082 DEBUG(0, ("Could not write result\n"));
1083 exit(1);
1084 }
1085 }
1086 }
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