Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 :
4 : WINS Replication server
5 :
6 : Copyright (C) Stefan Metzmacher 2005
7 :
8 : This program is free software; you can redistribute it and/or modify
9 : it under the terms of the GNU General Public License as published by
10 : the Free Software Foundation; either version 3 of the License, or
11 : (at your option) any later version.
12 :
13 : This program is distributed in the hope that it will be useful,
14 : but WITHOUT ANY WARRANTY; without even the implied warranty of
15 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 : GNU General Public License for more details.
17 :
18 : You should have received a copy of the GNU General Public License
19 : along with this program. If not, see <http://www.gnu.org/licenses/>.
20 : */
21 :
22 : #include "includes.h"
23 : #include "../lib/util/dlinklist.h"
24 : #include "samba/service_task.h"
25 : #include "samba/service.h"
26 : #include "lib/messaging/irpc.h"
27 : #include "librpc/gen_ndr/winsrepl.h"
28 : #include "wrepl_server/wrepl_server.h"
29 : #include "nbt_server/wins/winsdb.h"
30 : #include <ldb.h>
31 : #include <ldb_errors.h>
32 : #include "auth/auth.h"
33 : #include "ldb_wrap.h"
34 : #include "param/param.h"
35 : #include "lib/socket/netif.h"
36 :
37 65 : static struct ldb_context *wins_config_db_connect(TALLOC_CTX *mem_ctx,
38 : struct tevent_context *ev_ctx,
39 : struct loadparm_context *lp_ctx)
40 : {
41 65 : return ldb_wrap_connect(mem_ctx, ev_ctx, lp_ctx, lpcfg_private_path(mem_ctx,
42 : lp_ctx, "wins_config.ldb"),
43 : system_session(lp_ctx), NULL, 0);
44 : }
45 :
46 3691 : static uint64_t wins_config_db_get_seqnumber(struct ldb_context *ldb)
47 : {
48 33 : int ret;
49 33 : struct ldb_dn *dn;
50 3691 : struct ldb_result *res = NULL;
51 3691 : TALLOC_CTX *tmp_ctx = talloc_new(ldb);
52 3691 : uint64_t seqnumber = 0;
53 :
54 3691 : dn = ldb_dn_new(tmp_ctx, ldb, "@BASEINFO");
55 3691 : if (!dn) goto failed;
56 :
57 : /* find the record in the WINS database */
58 3691 : ret = ldb_search(ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
59 3691 : if (ret != LDB_SUCCESS) goto failed;
60 3691 : if (res->count > 1) goto failed;
61 :
62 3691 : if (res->count == 1) {
63 3691 : seqnumber = ldb_msg_find_attr_as_uint64(res->msgs[0], "sequenceNumber", 0);
64 : }
65 :
66 0 : failed:
67 3691 : talloc_free(tmp_ctx);
68 3691 : return seqnumber;
69 : }
70 :
71 : /*
72 : open winsdb
73 : */
74 65 : static NTSTATUS wreplsrv_open_winsdb(struct wreplsrv_service *service,
75 : struct loadparm_context *lp_ctx)
76 : {
77 65 : const char *owner = lpcfg_parm_string(lp_ctx, NULL, "winsdb", "local_owner");
78 :
79 65 : if (owner == NULL) {
80 2 : struct interface *ifaces;
81 65 : load_interface_list(service, lp_ctx, &ifaces);
82 65 : owner = iface_list_first_v4(ifaces);
83 : }
84 :
85 65 : service->wins_db = winsdb_connect(service, service->task->event_ctx, lp_ctx, owner, WINSDB_HANDLE_CALLER_WREPL);
86 65 : if (!service->wins_db) {
87 0 : return NT_STATUS_INTERNAL_DB_ERROR;
88 : }
89 :
90 65 : service->config.ldb = wins_config_db_connect(service, service->task->event_ctx, lp_ctx);
91 65 : if (!service->config.ldb) {
92 0 : return NT_STATUS_INTERNAL_DB_ERROR;
93 : }
94 :
95 : /* the default renew interval is 6 days */
96 65 : service->config.renew_interval = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","renew_interval", 6*24*60*60);
97 :
98 : /* the default tombstone (extinction) interval is 6 days */
99 65 : service->config.tombstone_interval= lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_interval", 6*24*60*60);
100 :
101 : /* the default tombstone (extinction) timeout is 1 day */
102 65 : service->config.tombstone_timeout = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_timeout", 1*24*60*60);
103 :
104 : /* the default tombstone extra timeout is 3 days */
105 65 : service->config.tombstone_extra_timeout = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_extra_timeout", 3*24*60*60);
106 :
107 : /* the default verify interval is 24 days */
108 65 : service->config.verify_interval = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","verify_interval", 24*24*60*60);
109 :
110 : /* the default scavenging interval is 'renew_interval/2' */
111 130 : service->config.scavenging_interval=lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","scavenging_interval",
112 65 : service->config.renew_interval/2);
113 :
114 : /* the maximum interval to the next periodic processing event */
115 65 : service->config.periodic_interval = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","periodic_interval", 15);
116 :
117 65 : return NT_STATUS_OK;
118 : }
119 :
120 799 : struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
121 : {
122 4 : struct wreplsrv_partner *cur;
123 :
124 854 : for (cur = service->partners; cur; cur = cur->next) {
125 734 : if (strcmp(cur->address, peer_addr) == 0) {
126 679 : return cur;
127 : }
128 : }
129 :
130 116 : return NULL;
131 : }
132 :
133 49 : static uint32_t wreplsrv_find_attr_as_uint32(const struct ldb_message *msg,
134 : const char *attr_name,
135 : uint32_t default_value)
136 : {
137 49 : const struct ldb_val *v = ldb_msg_find_ldb_val(msg, attr_name);
138 49 : char buf[sizeof("-2147483648")] = {};
139 49 : char *end = NULL;
140 2 : uint32_t ret;
141 49 : int base = 10;
142 :
143 49 : if (!v || !v->data) {
144 0 : return default_value;
145 : }
146 :
147 49 : if (v->length >= sizeof(buf)) {
148 0 : return default_value;
149 : }
150 :
151 49 : memcpy(buf, v->data, v->length);
152 49 : if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {
153 49 : base = 16;
154 : }
155 :
156 49 : errno = 0;
157 49 : ret = strtoll(buf, &end, base);
158 49 : if (errno == ERANGE || errno == EINVAL) {
159 0 : errno = 0;
160 0 : ret = strtoull(buf, &end, base);
161 0 : if (errno == ERANGE || errno == EINVAL) {
162 0 : return default_value;
163 : }
164 : }
165 49 : if (end && end[0] != '\0') {
166 0 : return default_value;
167 : }
168 47 : return ret;
169 : }
170 :
171 : /*
172 : load our replication partners
173 : */
174 3691 : NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
175 : {
176 33 : struct wreplsrv_partner *partner;
177 3691 : struct ldb_result *res = NULL;
178 33 : int ret;
179 33 : TALLOC_CTX *tmp_ctx;
180 33 : unsigned int i;
181 33 : uint64_t new_seqnumber;
182 :
183 3691 : new_seqnumber = wins_config_db_get_seqnumber(service->config.ldb);
184 :
185 : /* if it's not the first run and nothing changed we're done */
186 3691 : if (service->config.seqnumber != 0 && service->config.seqnumber == new_seqnumber) {
187 3626 : return NT_STATUS_OK;
188 : }
189 :
190 65 : tmp_ctx = talloc_new(service);
191 65 : NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
192 :
193 65 : service->config.seqnumber = new_seqnumber;
194 :
195 : /* find the record in the WINS database */
196 65 : ret = ldb_search(service->config.ldb, tmp_ctx, &res,
197 : ldb_dn_new(tmp_ctx, service->config.ldb, "CN=PARTNERS"),
198 : LDB_SCOPE_SUBTREE, NULL, "(objectClass=wreplPartner)");
199 65 : if (ret != LDB_SUCCESS) goto failed;
200 :
201 : /* first disable all existing partners */
202 65 : for (partner=service->partners; partner; partner = partner->next) {
203 0 : partner->type = WINSREPL_PARTNER_NONE;
204 : }
205 :
206 114 : for (i=0; i < res->count; i++) {
207 2 : const char *address;
208 :
209 49 : address = ldb_msg_find_attr_as_string(res->msgs[i], "address", NULL);
210 49 : if (!address) {
211 0 : goto failed;
212 : }
213 :
214 49 : partner = wreplsrv_find_partner(service, address);
215 49 : if (partner) {
216 0 : if (partner->name != partner->address) {
217 0 : talloc_free(discard_const(partner->name));
218 : }
219 0 : partner->name = NULL;
220 0 : talloc_free(discard_const(partner->our_address));
221 0 : partner->our_address = NULL;
222 :
223 : /* force rescheduling of pulling */
224 0 : partner->pull.next_run = timeval_zero();
225 : } else {
226 49 : partner = talloc_zero(service, struct wreplsrv_partner);
227 49 : if (partner == NULL) goto failed;
228 :
229 49 : partner->service = service;
230 49 : partner->address = address;
231 49 : talloc_steal(partner, partner->address);
232 :
233 49 : DLIST_ADD_END(service->partners, partner);
234 : }
235 :
236 49 : partner->name = ldb_msg_find_attr_as_string(res->msgs[i], "name", partner->address);
237 49 : talloc_steal(partner, partner->name);
238 49 : partner->our_address = ldb_msg_find_attr_as_string(res->msgs[i], "ourAddress", NULL);
239 49 : talloc_steal(partner, partner->our_address);
240 :
241 49 : partner->type = wreplsrv_find_attr_as_uint32(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
242 49 : partner->pull.interval = ldb_msg_find_attr_as_uint(res->msgs[i], "pullInterval",
243 : WINSREPL_DEFAULT_PULL_INTERVAL);
244 49 : partner->pull.retry_interval = ldb_msg_find_attr_as_uint(res->msgs[i], "pullRetryInterval",
245 : WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
246 49 : partner->push.change_count = ldb_msg_find_attr_as_uint(res->msgs[i], "pushChangeCount",
247 : WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
248 49 : partner->push.use_inform = ldb_msg_find_attr_as_uint(res->msgs[i], "pushUseInform", true);
249 :
250 49 : DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
251 : partner->address, partner->type));
252 : }
253 :
254 65 : DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
255 : res->count, (unsigned long long)service->config.seqnumber));
256 :
257 65 : talloc_free(tmp_ctx);
258 65 : return NT_STATUS_OK;
259 0 : failed:
260 0 : talloc_free(tmp_ctx);
261 0 : return NT_STATUS_FOOBAR;
262 : }
263 :
264 3 : NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
265 : TALLOC_CTX *mem_ctx,
266 : struct wrepl_table *table_out,
267 : const char *initiator,
268 : bool full_table)
269 : {
270 0 : struct wreplsrv_owner *cur;
271 3 : uint32_t i = 0;
272 :
273 3 : table_out->partner_count = 0;
274 3 : table_out->partners = NULL;
275 3 : table_out->initiator = initiator;
276 :
277 9 : for (cur = service->table; cur; cur = cur->next) {
278 6 : if (full_table) {
279 6 : table_out->partner_count++;
280 6 : continue;
281 : }
282 :
283 0 : if (strcmp(initiator, cur->owner.address) != 0) continue;
284 :
285 0 : table_out->partner_count++;
286 0 : break;
287 : }
288 :
289 3 : table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
290 3 : NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
291 :
292 9 : for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
293 : /*
294 : * if it's our local entry
295 : * update the max version
296 : */
297 6 : if (cur == service->owner) {
298 3 : cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
299 : }
300 :
301 6 : if (full_table) {
302 6 : table_out->partners[i] = cur->owner;
303 6 : i++;
304 6 : continue;
305 : }
306 :
307 0 : if (strcmp(initiator, cur->owner.address) != 0) continue;
308 :
309 0 : table_out->partners[i] = cur->owner;
310 0 : i++;
311 0 : break;
312 : }
313 :
314 3 : return NT_STATUS_OK;
315 : }
316 :
317 5025 : struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
318 : struct wreplsrv_owner *table,
319 : const char *wins_owner)
320 : {
321 6 : struct wreplsrv_owner *cur;
322 :
323 10634 : for (cur = table; cur; cur = cur->next) {
324 10560 : if (strcmp(cur->owner.address, wins_owner) == 0) {
325 : /*
326 : * if it's our local entry
327 : * update the max version
328 : */
329 4951 : if (cur == service->owner) {
330 74 : cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
331 : }
332 4951 : return cur;
333 : }
334 : }
335 :
336 72 : return NULL;
337 : }
338 :
339 : /*
340 : update the wins_owner_table max_version, if the given version is the highest version
341 : if no entry for the wins_owner exists yet, create one
342 : */
343 1480 : NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
344 : TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
345 : const char *wins_owner, uint64_t version)
346 : {
347 1480 : struct wreplsrv_owner *table = *_table;
348 4 : struct wreplsrv_owner *cur;
349 :
350 1480 : if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
351 0 : wins_owner = service->wins_db->local_owner;
352 : }
353 :
354 1480 : cur = wreplsrv_find_owner(service, table, wins_owner);
355 :
356 : /* if it doesn't exists yet, create one */
357 1480 : if (!cur) {
358 71 : cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
359 71 : NT_STATUS_HAVE_NO_MEMORY(cur);
360 :
361 71 : cur->owner.address = talloc_strdup(cur, wins_owner);
362 71 : NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
363 71 : cur->owner.min_version = 0;
364 71 : cur->owner.max_version = 0;
365 71 : cur->owner.type = 1; /* don't know why this is always 1 */
366 :
367 71 : cur->partner = wreplsrv_find_partner(service, wins_owner);
368 :
369 71 : DLIST_ADD_END(table, cur);
370 71 : *_table = table;
371 : }
372 :
373 : /* the min_version is always 0 here, and won't be updated */
374 :
375 : /* if the given version is higher than the current max_version, update */
376 1480 : if (cur->owner.max_version < version) {
377 1350 : cur->owner.max_version = version;
378 : /* if it's for our local db, we need to update the wins.ldb too */
379 1350 : if (cur == service->owner) {
380 0 : uint64_t ret;
381 0 : ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
382 0 : if (ret != cur->owner.max_version) {
383 0 : DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
384 : (unsigned long long)cur->owner.max_version,
385 : (unsigned long long)ret));
386 0 : return NT_STATUS_INTERNAL_DB_CORRUPTION;
387 : }
388 : }
389 : }
390 :
391 1480 : return NT_STATUS_OK;
392 : }
393 :
394 : /*
395 : load the partner table
396 : */
397 65 : static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
398 : {
399 65 : struct ldb_result *res = NULL;
400 2 : int ret;
401 2 : NTSTATUS status;
402 65 : TALLOC_CTX *tmp_ctx = talloc_new(service);
403 65 : struct ldb_context *ldb = service->wins_db->ldb;
404 2 : unsigned int i;
405 2 : struct wreplsrv_owner *local_owner;
406 2 : const char *wins_owner;
407 2 : uint64_t version;
408 65 : const char * const attrs[] = {
409 : "winsOwner",
410 : "versionID",
411 : NULL
412 : };
413 :
414 : /*
415 : * make sure we have our local entry in the list,
416 : * but we set service->owner when we're done
417 : * to avoid to many calls to wreplsrv_local_max_version()
418 : */
419 65 : status = wreplsrv_add_table(service,
420 : service, &service->table,
421 63 : service->wins_db->local_owner, 0);
422 65 : if (!NT_STATUS_IS_OK(status)) goto failed;
423 65 : local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
424 65 : if (!local_owner) {
425 0 : status = NT_STATUS_INTERNAL_ERROR;
426 0 : goto failed;
427 : }
428 :
429 : /* find the record in the WINS database */
430 65 : ret = ldb_search(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
431 : attrs, "(objectClass=winsRecord)");
432 65 : status = NT_STATUS_INTERNAL_DB_CORRUPTION;
433 65 : if (ret != LDB_SUCCESS) goto failed;
434 :
435 65 : for (i=0; i < res->count; i++) {
436 0 : wins_owner = ldb_msg_find_attr_as_string(res->msgs[i], "winsOwner", NULL);
437 0 : version = ldb_msg_find_attr_as_uint64(res->msgs[i], "versionID", 0);
438 :
439 0 : status = wreplsrv_add_table(service,
440 : service, &service->table,
441 : wins_owner, version);
442 0 : if (!NT_STATUS_IS_OK(status)) goto failed;
443 0 : talloc_free(res->msgs[i]);
444 : }
445 :
446 : /*
447 : * this makes sure we call wreplsrv_local_max_version() before returning in
448 : * wreplsrv_find_owner()
449 : */
450 65 : service->owner = local_owner;
451 :
452 : /*
453 : * this makes sure the maxVersion in the database is updated,
454 : * with the highest version we found, if this is higher than the current stored one
455 : */
456 67 : status = wreplsrv_add_table(service,
457 : service, &service->table,
458 65 : service->wins_db->local_owner, local_owner->owner.max_version);
459 65 : if (!NT_STATUS_IS_OK(status)) goto failed;
460 :
461 65 : talloc_free(tmp_ctx);
462 65 : return NT_STATUS_OK;
463 0 : failed:
464 0 : talloc_free(tmp_ctx);
465 0 : return status;
466 : }
467 :
468 : /*
469 : setup our replication partners
470 : */
471 65 : static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
472 : {
473 2 : NTSTATUS status;
474 :
475 65 : status = wreplsrv_load_partners(service);
476 65 : NT_STATUS_NOT_OK_RETURN(status);
477 :
478 65 : status = wreplsrv_load_table(service);
479 65 : NT_STATUS_NOT_OK_RETURN(status);
480 :
481 65 : return NT_STATUS_OK;
482 : }
483 :
484 : /*
485 : startup the wrepl task
486 : */
487 65 : static NTSTATUS wreplsrv_task_init(struct task_server *task)
488 : {
489 2 : NTSTATUS status;
490 2 : struct wreplsrv_service *service;
491 :
492 65 : if (!lpcfg_we_are_a_wins_server(task->lp_ctx)) {
493 0 : return NT_STATUS_INVALID_DOMAIN_ROLE;
494 : }
495 :
496 65 : task_server_set_title(task, "task[wreplsrv]");
497 :
498 65 : service = talloc_zero(task, struct wreplsrv_service);
499 65 : if (!service) {
500 0 : task_server_terminate(task, "wreplsrv_task_init: out of memory", true);
501 0 : return NT_STATUS_NO_MEMORY;
502 : }
503 65 : service->task = task;
504 65 : service->startup_time = timeval_current();
505 65 : task->private_data = service;
506 :
507 : /*
508 : * setup up all partners, and open the winsdb
509 : */
510 65 : status = wreplsrv_open_winsdb(service, task->lp_ctx);
511 65 : if (!NT_STATUS_IS_OK(status)) {
512 0 : task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed", true);
513 0 : return status;
514 : }
515 :
516 : /*
517 : * setup timed events for each partner we want to pull from
518 : */
519 65 : status = wreplsrv_setup_partners(service);
520 65 : if (!NT_STATUS_IS_OK(status)) {
521 0 : task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed", true);
522 0 : return status;
523 : }
524 :
525 : /*
526 : * setup listen sockets, so we can answer requests from our partners,
527 : * which pull from us
528 : */
529 65 : status = wreplsrv_setup_sockets(service, task->lp_ctx);
530 65 : if (!NT_STATUS_IS_OK(status)) {
531 0 : task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed", true);
532 0 : return status;
533 : }
534 :
535 65 : status = wreplsrv_setup_periodic(service);
536 65 : if (!NT_STATUS_IS_OK(status)) {
537 0 : task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed", true);
538 0 : return status;
539 : }
540 :
541 65 : irpc_add_name(task->msg_ctx, "wrepl_server");
542 :
543 65 : return NT_STATUS_OK;
544 : }
545 :
546 : /*
547 : register ourselves as a available server
548 : */
549 66 : NTSTATUS server_service_wrepl_init(TALLOC_CTX *ctx)
550 : {
551 3 : static const struct service_details details = {
552 : .inhibit_fork_on_accept = true,
553 : .inhibit_pre_fork = true,
554 : .task_init = wreplsrv_task_init,
555 : .post_fork = NULL
556 : };
557 66 : return register_server_service(ctx, "wrepl", &details);
558 : }
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