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 63 : 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 63 : 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 5558 : static uint64_t wins_config_db_get_seqnumber(struct ldb_context *ldb)
47 : {
48 : int ret;
49 : struct ldb_dn *dn;
50 5558 : struct ldb_result *res = NULL;
51 5558 : TALLOC_CTX *tmp_ctx = talloc_new(ldb);
52 5558 : uint64_t seqnumber = 0;
53 :
54 5558 : dn = ldb_dn_new(tmp_ctx, ldb, "@BASEINFO");
55 5558 : if (!dn) goto failed;
56 :
57 : /* find the record in the WINS database */
58 5558 : ret = ldb_search(ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
59 5558 : if (ret != LDB_SUCCESS) goto failed;
60 5558 : if (res->count > 1) goto failed;
61 :
62 5558 : if (res->count == 1) {
63 5558 : seqnumber = ldb_msg_find_attr_as_uint64(res->msgs[0], "sequenceNumber", 0);
64 : }
65 :
66 4101 : failed:
67 5558 : talloc_free(tmp_ctx);
68 5558 : return seqnumber;
69 : }
70 :
71 : /*
72 : open winsdb
73 : */
74 63 : static NTSTATUS wreplsrv_open_winsdb(struct wreplsrv_service *service,
75 : struct loadparm_context *lp_ctx)
76 : {
77 63 : const char *owner = lpcfg_parm_string(lp_ctx, NULL, "winsdb", "local_owner");
78 :
79 63 : if (owner == NULL) {
80 : struct interface *ifaces;
81 63 : load_interface_list(service, lp_ctx, &ifaces);
82 63 : owner = iface_list_first_v4(ifaces);
83 : }
84 :
85 63 : service->wins_db = winsdb_connect(service, service->task->event_ctx, lp_ctx, owner, WINSDB_HANDLE_CALLER_WREPL);
86 63 : if (!service->wins_db) {
87 0 : return NT_STATUS_INTERNAL_DB_ERROR;
88 : }
89 :
90 63 : service->config.ldb = wins_config_db_connect(service, service->task->event_ctx, lp_ctx);
91 63 : if (!service->config.ldb) {
92 0 : return NT_STATUS_INTERNAL_DB_ERROR;
93 : }
94 :
95 : /* the default renew interval is 6 days */
96 63 : 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 63 : 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 63 : 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 63 : 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 63 : 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 82 : service->config.scavenging_interval=lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","scavenging_interval",
112 63 : service->config.renew_interval/2);
113 :
114 : /* the maximun interval to the next periodic processing event */
115 63 : service->config.periodic_interval = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","periodic_interval", 15);
116 :
117 63 : return NT_STATUS_OK;
118 : }
119 :
120 797 : struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
121 : {
122 : struct wreplsrv_partner *cur;
123 :
124 852 : for (cur = service->partners; cur; cur = cur->next) {
125 734 : if (strcmp(cur->address, peer_addr) == 0) {
126 679 : return cur;
127 : }
128 : }
129 :
130 114 : return NULL;
131 : }
132 :
133 : /*
134 : load our replication partners
135 : */
136 5558 : NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
137 : {
138 : struct wreplsrv_partner *partner;
139 5558 : struct ldb_result *res = NULL;
140 : int ret;
141 : TALLOC_CTX *tmp_ctx;
142 : unsigned int i;
143 : uint64_t new_seqnumber;
144 :
145 5558 : new_seqnumber = wins_config_db_get_seqnumber(service->config.ldb);
146 :
147 : /* if it's not the first run and nothing changed we're done */
148 5558 : if (service->config.seqnumber != 0 && service->config.seqnumber == new_seqnumber) {
149 5495 : return NT_STATUS_OK;
150 : }
151 :
152 63 : tmp_ctx = talloc_new(service);
153 63 : NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
154 :
155 63 : service->config.seqnumber = new_seqnumber;
156 :
157 : /* find the record in the WINS database */
158 63 : ret = ldb_search(service->config.ldb, tmp_ctx, &res,
159 : ldb_dn_new(tmp_ctx, service->config.ldb, "CN=PARTNERS"),
160 : LDB_SCOPE_SUBTREE, NULL, "(objectClass=wreplPartner)");
161 63 : if (ret != LDB_SUCCESS) goto failed;
162 :
163 : /* first disable all existing partners */
164 63 : for (partner=service->partners; partner; partner = partner->next) {
165 0 : partner->type = WINSREPL_PARTNER_NONE;
166 : }
167 :
168 110 : for (i=0; i < res->count; i++) {
169 : const char *address;
170 :
171 49 : address = ldb_msg_find_attr_as_string(res->msgs[i], "address", NULL);
172 49 : if (!address) {
173 0 : goto failed;
174 : }
175 :
176 49 : partner = wreplsrv_find_partner(service, address);
177 49 : if (partner) {
178 0 : if (partner->name != partner->address) {
179 0 : talloc_free(discard_const(partner->name));
180 : }
181 0 : partner->name = NULL;
182 0 : talloc_free(discard_const(partner->our_address));
183 0 : partner->our_address = NULL;
184 :
185 : /* force rescheduling of pulling */
186 0 : partner->pull.next_run = timeval_zero();
187 : } else {
188 49 : partner = talloc_zero(service, struct wreplsrv_partner);
189 49 : if (partner == NULL) goto failed;
190 :
191 49 : partner->service = service;
192 49 : partner->address = address;
193 49 : talloc_steal(partner, partner->address);
194 :
195 49 : DLIST_ADD_END(service->partners, partner);
196 : }
197 :
198 49 : partner->name = ldb_msg_find_attr_as_string(res->msgs[i], "name", partner->address);
199 49 : talloc_steal(partner, partner->name);
200 49 : partner->our_address = ldb_msg_find_attr_as_string(res->msgs[i], "ourAddress", NULL);
201 49 : talloc_steal(partner, partner->our_address);
202 :
203 49 : partner->type = ldb_msg_find_attr_as_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
204 49 : partner->pull.interval = ldb_msg_find_attr_as_uint(res->msgs[i], "pullInterval",
205 : WINSREPL_DEFAULT_PULL_INTERVAL);
206 49 : partner->pull.retry_interval = ldb_msg_find_attr_as_uint(res->msgs[i], "pullRetryInterval",
207 : WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
208 49 : partner->push.change_count = ldb_msg_find_attr_as_uint(res->msgs[i], "pushChangeCount",
209 : WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
210 49 : partner->push.use_inform = ldb_msg_find_attr_as_uint(res->msgs[i], "pushUseInform", true);
211 :
212 49 : DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
213 : partner->address, partner->type));
214 : }
215 :
216 63 : DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
217 : res->count, (unsigned long long)service->config.seqnumber));
218 :
219 63 : talloc_free(tmp_ctx);
220 63 : return NT_STATUS_OK;
221 0 : failed:
222 0 : talloc_free(tmp_ctx);
223 0 : return NT_STATUS_FOOBAR;
224 : }
225 :
226 3 : NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
227 : TALLOC_CTX *mem_ctx,
228 : struct wrepl_table *table_out,
229 : const char *initiator,
230 : bool full_table)
231 : {
232 : struct wreplsrv_owner *cur;
233 3 : uint32_t i = 0;
234 :
235 3 : table_out->partner_count = 0;
236 3 : table_out->partners = NULL;
237 3 : table_out->initiator = initiator;
238 :
239 9 : for (cur = service->table; cur; cur = cur->next) {
240 6 : if (full_table) {
241 6 : table_out->partner_count++;
242 6 : continue;
243 : }
244 :
245 0 : if (strcmp(initiator, cur->owner.address) != 0) continue;
246 :
247 0 : table_out->partner_count++;
248 0 : break;
249 : }
250 :
251 3 : table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
252 3 : NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
253 :
254 9 : for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
255 : /*
256 : * if it's our local entry
257 : * update the max version
258 : */
259 6 : if (cur == service->owner) {
260 3 : cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
261 : }
262 :
263 6 : if (full_table) {
264 6 : table_out->partners[i] = cur->owner;
265 6 : i++;
266 6 : continue;
267 : }
268 :
269 0 : if (strcmp(initiator, cur->owner.address) != 0) continue;
270 :
271 0 : table_out->partners[i] = cur->owner;
272 0 : i++;
273 0 : break;
274 : }
275 :
276 3 : return NT_STATUS_OK;
277 : }
278 :
279 5019 : struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
280 : struct wreplsrv_owner *table,
281 : const char *wins_owner)
282 : {
283 : struct wreplsrv_owner *cur;
284 :
285 10628 : for (cur = table; cur; cur = cur->next) {
286 10556 : if (strcmp(cur->owner.address, wins_owner) == 0) {
287 : /*
288 : * if it's our local entry
289 : * update the max version
290 : */
291 4947 : if (cur == service->owner) {
292 72 : cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
293 : }
294 4943 : return cur;
295 : }
296 : }
297 :
298 70 : return NULL;
299 : }
300 :
301 : /*
302 : update the wins_owner_table max_version, if the given version is the highest version
303 : if no entry for the wins_owner exists yet, create one
304 : */
305 1476 : NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
306 : TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
307 : const char *wins_owner, uint64_t version)
308 : {
309 1476 : struct wreplsrv_owner *table = *_table;
310 : struct wreplsrv_owner *cur;
311 :
312 1476 : if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
313 0 : wins_owner = service->wins_db->local_owner;
314 : }
315 :
316 1476 : cur = wreplsrv_find_owner(service, table, wins_owner);
317 :
318 : /* if it doesn't exists yet, create one */
319 1476 : if (!cur) {
320 69 : cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
321 69 : NT_STATUS_HAVE_NO_MEMORY(cur);
322 :
323 69 : cur->owner.address = talloc_strdup(cur, wins_owner);
324 69 : NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
325 69 : cur->owner.min_version = 0;
326 69 : cur->owner.max_version = 0;
327 69 : cur->owner.type = 1; /* don't know why this is always 1 */
328 :
329 69 : cur->partner = wreplsrv_find_partner(service, wins_owner);
330 :
331 69 : DLIST_ADD_END(table, cur);
332 69 : *_table = table;
333 : }
334 :
335 : /* the min_version is always 0 here, and won't be updated */
336 :
337 : /* if the given version is higher than the current max_version, update */
338 1476 : if (cur->owner.max_version < version) {
339 1350 : cur->owner.max_version = version;
340 : /* if it's for our local db, we need to update the wins.ldb too */
341 1350 : if (cur == service->owner) {
342 : uint64_t ret;
343 0 : ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
344 0 : if (ret != cur->owner.max_version) {
345 0 : DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
346 : (unsigned long long)cur->owner.max_version,
347 : (unsigned long long)ret));
348 0 : return NT_STATUS_INTERNAL_DB_CORRUPTION;
349 : }
350 : }
351 : }
352 :
353 1476 : return NT_STATUS_OK;
354 : }
355 :
356 : /*
357 : load the partner table
358 : */
359 63 : static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
360 : {
361 63 : struct ldb_result *res = NULL;
362 : int ret;
363 : NTSTATUS status;
364 63 : TALLOC_CTX *tmp_ctx = talloc_new(service);
365 63 : struct ldb_context *ldb = service->wins_db->ldb;
366 : unsigned int i;
367 : struct wreplsrv_owner *local_owner;
368 : const char *wins_owner;
369 : uint64_t version;
370 63 : const char * const attrs[] = {
371 : "winsOwner",
372 : "versionID",
373 : NULL
374 : };
375 :
376 : /*
377 : * make sure we have our local entry in the list,
378 : * but we set service->owner when we're done
379 : * to avoid to many calls to wreplsrv_local_max_version()
380 : */
381 63 : status = wreplsrv_add_table(service,
382 : service, &service->table,
383 61 : service->wins_db->local_owner, 0);
384 63 : if (!NT_STATUS_IS_OK(status)) goto failed;
385 63 : local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
386 63 : if (!local_owner) {
387 0 : status = NT_STATUS_INTERNAL_ERROR;
388 0 : goto failed;
389 : }
390 :
391 : /* find the record in the WINS database */
392 63 : ret = ldb_search(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
393 : attrs, "(objectClass=winsRecord)");
394 63 : status = NT_STATUS_INTERNAL_DB_CORRUPTION;
395 63 : if (ret != LDB_SUCCESS) goto failed;
396 :
397 61 : for (i=0; i < res->count; i++) {
398 0 : wins_owner = ldb_msg_find_attr_as_string(res->msgs[i], "winsOwner", NULL);
399 0 : version = ldb_msg_find_attr_as_uint64(res->msgs[i], "versionID", 0);
400 :
401 0 : status = wreplsrv_add_table(service,
402 : service, &service->table,
403 : wins_owner, version);
404 0 : if (!NT_STATUS_IS_OK(status)) goto failed;
405 0 : talloc_free(res->msgs[i]);
406 : }
407 :
408 : /*
409 : * this makes sure we call wreplsrv_local_max_version() before returning in
410 : * wreplsrv_find_owner()
411 : */
412 63 : service->owner = local_owner;
413 :
414 : /*
415 : * this makes sure the maxVersion in the database is updated,
416 : * with the highest version we found, if this is higher than the current stored one
417 : */
418 107 : status = wreplsrv_add_table(service,
419 : service, &service->table,
420 63 : service->wins_db->local_owner, local_owner->owner.max_version);
421 63 : if (!NT_STATUS_IS_OK(status)) goto failed;
422 :
423 63 : talloc_free(tmp_ctx);
424 63 : return NT_STATUS_OK;
425 0 : failed:
426 0 : talloc_free(tmp_ctx);
427 0 : return status;
428 : }
429 :
430 : /*
431 : setup our replication partners
432 : */
433 63 : static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
434 : {
435 : NTSTATUS status;
436 :
437 63 : status = wreplsrv_load_partners(service);
438 63 : NT_STATUS_NOT_OK_RETURN(status);
439 :
440 63 : status = wreplsrv_load_table(service);
441 63 : NT_STATUS_NOT_OK_RETURN(status);
442 :
443 63 : return NT_STATUS_OK;
444 : }
445 :
446 : /*
447 : startup the wrepl task
448 : */
449 63 : static NTSTATUS wreplsrv_task_init(struct task_server *task)
450 : {
451 : NTSTATUS status;
452 : struct wreplsrv_service *service;
453 :
454 63 : if (!lpcfg_we_are_a_wins_server(task->lp_ctx)) {
455 0 : return NT_STATUS_INVALID_DOMAIN_ROLE;
456 : }
457 :
458 63 : task_server_set_title(task, "task[wreplsrv]");
459 :
460 63 : service = talloc_zero(task, struct wreplsrv_service);
461 63 : if (!service) {
462 0 : task_server_terminate(task, "wreplsrv_task_init: out of memory", true);
463 0 : return NT_STATUS_NO_MEMORY;
464 : }
465 63 : service->task = task;
466 63 : service->startup_time = timeval_current();
467 63 : task->private_data = service;
468 :
469 : /*
470 : * setup up all partners, and open the winsdb
471 : */
472 63 : status = wreplsrv_open_winsdb(service, task->lp_ctx);
473 63 : if (!NT_STATUS_IS_OK(status)) {
474 0 : task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed", true);
475 0 : return status;
476 : }
477 :
478 : /*
479 : * setup timed events for each partner we want to pull from
480 : */
481 63 : status = wreplsrv_setup_partners(service);
482 63 : if (!NT_STATUS_IS_OK(status)) {
483 0 : task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed", true);
484 0 : return status;
485 : }
486 :
487 : /*
488 : * setup listen sockets, so we can answer requests from our partners,
489 : * which pull from us
490 : */
491 63 : status = wreplsrv_setup_sockets(service, task->lp_ctx);
492 63 : if (!NT_STATUS_IS_OK(status)) {
493 0 : task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed", true);
494 0 : return status;
495 : }
496 :
497 63 : status = wreplsrv_setup_periodic(service);
498 63 : if (!NT_STATUS_IS_OK(status)) {
499 0 : task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed", true);
500 0 : return status;
501 : }
502 :
503 63 : irpc_add_name(task->msg_ctx, "wrepl_server");
504 :
505 63 : return NT_STATUS_OK;
506 : }
507 :
508 : /*
509 : register ourselves as a available server
510 : */
511 64 : NTSTATUS server_service_wrepl_init(TALLOC_CTX *ctx)
512 : {
513 : static const struct service_details details = {
514 : .inhibit_fork_on_accept = true,
515 : .inhibit_pre_fork = true,
516 : .task_init = wreplsrv_task_init,
517 : .post_fork = NULL
518 : };
519 64 : return register_server_service(ctx, "wrepl", &details);
520 : }
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