source4/wrepl_server/wrepl_server.c

   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 "smbd/service_task.h"
  25 #include "smbd/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/include/ldb.h"
  31 #include "ldb/include/ldb_errors.h"
  32 #include "auth/auth.h"
  33 #include "db_wrap.h"
  34
  35 static struct ldb_context *wins_config_db_connect(TALLOC_CTX *mem_ctx)
  36 {
  37         return ldb_wrap_connect(mem_ctx, private_path(mem_ctx, lp_wins_config_url()),
  38                                 system_session(mem_ctx), NULL, 0, NULL);
  39 }
  40
  41 static uint64_t wins_config_db_get_seqnumber(struct ldb_context *ldb)
  42 {
  43         int ret;
  44         struct ldb_dn *dn;
  45         struct ldb_result *res = NULL;
  46         TALLOC_CTX *tmp_ctx = talloc_new(ldb);
  47         uint64_t seqnumber = 0;
  48
  49         dn = ldb_dn_new(tmp_ctx, ldb, "@BASEINFO");
  50         if (!dn) goto failed;
  51
  52         /* find the record in the WINS database */
  53         ret = ldb_search(ldb, dn, LDB_SCOPE_BASE,
  54                          NULL, NULL, &res);
  55         if (ret != LDB_SUCCESS) goto failed;
  56         talloc_steal(tmp_ctx, res);
  57         if (res->count > 1) goto failed;
  58
  59         if (res->count == 1) {
  60                 seqnumber = ldb_msg_find_attr_as_uint64(res->msgs[0], "sequenceNumber", 0);
  61         }
  62
  63 failed:
  64         talloc_free(tmp_ctx);
  65         return seqnumber;
  66 }
  67
  68 /*
  69   open winsdb
  70 */
  71 static NTSTATUS wreplsrv_open_winsdb(struct wreplsrv_service *service)
  72 {
  73         service->wins_db     = winsdb_connect(service, WINSDB_HANDLE_CALLER_WREPL);
  74         if (!service->wins_db) {
  75                 return NT_STATUS_INTERNAL_DB_ERROR;
  76         }
  77
  78         service->config.ldb = wins_config_db_connect(service);
  79         if (!service->config.ldb) {
  80                 return NT_STATUS_INTERNAL_DB_ERROR;
  81         }
  82
  83         /* the default renew interval is 6 days */
  84         service->config.renew_interval    = lp_parm_int(-1,"wreplsrv","renew_interval", 6*24*60*60);
  85
  86         /* the default tombstone (extinction) interval is 6 days */
  87         service->config.tombstone_interval= lp_parm_int(-1,"wreplsrv","tombstone_interval", 6*24*60*60);
  88
  89         /* the default tombstone (extinction) timeout is 1 day */
  90         service->config.tombstone_timeout = lp_parm_int(-1,"wreplsrv","tombstone_timeout", 1*24*60*60);
  91
  92         /* the default tombstone extra timeout is 3 days */
  93         service->config.tombstone_extra_timeout = lp_parm_int(-1,"wreplsrv","tombstone_extra_timeout", 3*24*60*60);
  94
  95         /* the default verify interval is 24 days */
  96         service->config.verify_interval   = lp_parm_int(-1,"wreplsrv","verify_interval", 24*24*60*60);
  97
  98         /* the default scavenging interval is 'renew_interval/2' */
  99         service->config.scavenging_interval=lp_parm_int(-1,"wreplsrv","scavenging_interval",
 100                                                         service->config.renew_interval/2);
 101
 102         /* the maximun interval to the next periodic processing event */
 103         service->config.periodic_interval = lp_parm_int(-1,"wreplsrv","periodic_interval", 15);
 104
 105         return NT_STATUS_OK;
 106 }
 107
 108 struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
 109 {
 110         struct wreplsrv_partner *cur;
 111
 112         for (cur = service->partners; cur; cur = cur->next) {
 113                 if (strcmp(cur->address, peer_addr) == 0) {
 114                         return cur;
 115                 }
 116         }
 117
 118         return NULL;
 119 }
 120
 121 /*
 122   load our replication partners
 123 */
 124 NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
 125 {
 126         struct wreplsrv_partner *partner;
 127         struct ldb_result *res = NULL;
 128         int ret;
 129         TALLOC_CTX *tmp_ctx;
 130         int i;
 131         uint64_t new_seqnumber;
 132
 133         new_seqnumber = wins_config_db_get_seqnumber(service->config.ldb);
 134
 135         /* if it's not the first run and nothing changed we're done */
 136         if (service->config.seqnumber != 0 && service->config.seqnumber == new_seqnumber) {
 137                 return NT_STATUS_OK;
 138         }
 139
 140         tmp_ctx = talloc_new(service);
 141         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
 142
 143         service->config.seqnumber = new_seqnumber;
 144
 145         /* find the record in the WINS database */
 146         ret = ldb_search(service->config.ldb, ldb_dn_new(tmp_ctx, service->config.ldb, "CN=PARTNERS"), LDB_SCOPE_SUBTREE,
 147                          "(objectClass=wreplPartner)", NULL, &res);
 148         if (ret != LDB_SUCCESS) goto failed;
 149         talloc_steal(tmp_ctx, res);
 150
 151         /* first disable all existing partners */
 152         for (partner=service->partners; partner; partner = partner->next) {
 153                 partner->type = WINSREPL_PARTNER_NONE;
 154         }
 155
 156         for (i=0; i < res->count; i++) {
 157                 const char *address;
 158
 159                 address = ldb_msg_find_attr_as_string(res->msgs[i], "address", NULL);
 160                 if (!address) {
 161                         goto failed;
 162                 }
 163
 164                 partner = wreplsrv_find_partner(service, address);
 165                 if (partner) {
 166                         if (partner->name != partner->address) {
 167                                 talloc_free(discard_const(partner->name));
 168                         }
 169                         partner->name = NULL;
 170                         talloc_free(discard_const(partner->our_address));
 171                         partner->our_address = NULL;
 172
 173                         /* force rescheduling of pulling */
 174                         partner->pull.next_run = timeval_zero();
 175                 } else {
 176                         partner = talloc_zero(service, struct wreplsrv_partner);
 177                         if (partner == NULL) goto failed;
 178
 179                         partner->service = service;
 180                         partner->address = address;
 181                         talloc_steal(partner, partner->address);
 182
 183                         DLIST_ADD_END(service->partners, partner, struct wreplsrv_partner *);
 184                 }
 185
 186                 partner->name                   = ldb_msg_find_attr_as_string(res->msgs[i], "name", partner->address);
 187                 talloc_steal(partner, partner->name);
 188                 partner->our_address            = ldb_msg_find_attr_as_string(res->msgs[i], "ourAddress", NULL);
 189                 talloc_steal(partner, partner->our_address);
 190
 191                 partner->type                   = ldb_msg_find_attr_as_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
 192                 partner->pull.interval          = ldb_msg_find_attr_as_uint(res->msgs[i], "pullInterval",
 193                                                                     WINSREPL_DEFAULT_PULL_INTERVAL);
 194                 partner->pull.retry_interval    = ldb_msg_find_attr_as_uint(res->msgs[i], "pullRetryInterval",
 195                                                                     WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
 196                 partner->push.change_count      = ldb_msg_find_attr_as_uint(res->msgs[i], "pushChangeCount",
 197                                                                     WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
 198                 partner->push.use_inform        = ldb_msg_find_attr_as_uint(res->msgs[i], "pushUseInform", False);
 199
 200                 DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
 201                         partner->address, partner->type));
 202         }
 203
 204         DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
 205                 res->count, (unsigned long long)service->config.seqnumber));
 206
 207         talloc_free(tmp_ctx);
 208         return NT_STATUS_OK;
 209 failed:
 210         talloc_free(tmp_ctx);
 211         return NT_STATUS_FOOBAR;
 212 }
 213
 214 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 215                                    TALLOC_CTX *mem_ctx,
 216                                    struct wrepl_table *table_out,
 217                                    const char *initiator,
 218                                    BOOL full_table)
 219 {
 220         struct wreplsrv_owner *cur;
 221         uint32_t i = 0;
 222
 223         table_out->partner_count        = 0;
 224         table_out->partners             = NULL;
 225         table_out->initiator            = initiator;
 226
 227         for (cur = service->table; cur; cur = cur->next) {
 228                 if (full_table) {
 229                         table_out->partner_count++;
 230                         continue;
 231                 }
 232
 233                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 234
 235                 table_out->partner_count++;
 236                 break;
 237         }
 238
 239         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 240         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 241
 242         for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
 243                 /*
 244                  * if it's our local entry
 245                  * update the max version
 246                  */
 247                 if (cur == service->owner) {
 248                         cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 249                 }
 250
 251                 if (full_table) {
 252                         table_out->partners[i] = cur->owner;
 253                         i++;
 254                         continue;
 255                 }
 256
 257                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 258
 259                 table_out->partners[i] = cur->owner;
 260                 i++;
 261                 break;
 262         }
 263
 264         return NT_STATUS_OK;
 265 }
 266
 267 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
 268                                            struct wreplsrv_owner *table,
 269                                            const char *wins_owner)
 270 {
 271         struct wreplsrv_owner *cur;
 272
 273         for (cur = table; cur; cur = cur->next) {
 274                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 275                         /*
 276                          * if it's our local entry
 277                          * update the max version
 278                          */
 279                         if (cur == service->owner) {
 280                                 cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 281                         }
 282                         return cur;
 283                 }
 284         }
 285
 286         return NULL;
 287 }
 288
 289 /*
 290  update the wins_owner_table max_version, if the given version is the highest version
 291  if no entry for the wins_owner exists yet, create one
 292 */
 293 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 294                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 295                             const char *wins_owner, uint64_t version)
 296 {
 297         struct wreplsrv_owner *table = *_table;
 298         struct wreplsrv_owner *cur;
 299
 300         if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
 301                 wins_owner = service->wins_db->local_owner;
 302         }
 303
 304         cur = wreplsrv_find_owner(service, table, wins_owner);
 305
 306         /* if it doesn't exists yet, create one */
 307         if (!cur) {
 308                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 309                 NT_STATUS_HAVE_NO_MEMORY(cur);
 310
 311                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 312                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 313                 cur->owner.min_version  = 0;
 314                 cur->owner.max_version  = 0;
 315                 cur->owner.type         = 1; /* don't know why this is always 1 */
 316
 317                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 318
 319                 DLIST_ADD_END(table, cur, struct wreplsrv_owner *);
 320                 *_table = table;
 321         }
 322
 323         /* the min_version is always 0 here, and won't be updated */
 324
 325         /* if the given version is higher than the current max_version, update */
 326         if (cur->owner.max_version < version) {
 327                 cur->owner.max_version = version;
 328                 /* if it's for our local db, we need to update the wins.ldb too */
 329                 if (cur == service->owner) {
 330                         uint64_t ret;
 331                         ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
 332                         if (ret != cur->owner.max_version) {
 333                                 DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
 334                                          (unsigned long long)cur->owner.max_version,
 335                                          (unsigned long long)ret));
 336                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 337                         }
 338                 }
 339         }
 340
 341         return NT_STATUS_OK;
 342 }
 343
 344 /*
 345   load the partner table
 346 */
 347 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 348 {
 349         struct ldb_result *res = NULL;
 350         int ret;
 351         NTSTATUS status;
 352         TALLOC_CTX *tmp_ctx = talloc_new(service);
 353         struct ldb_context *ldb = service->wins_db->ldb;
 354         int i;
 355         struct wreplsrv_owner *local_owner;
 356         const char *wins_owner;
 357         uint64_t version;
 358         const char * const attrs[] = {
 359                 "winsOwner",
 360                 "versionID",
 361                 NULL
 362         };
 363
 364         /*
 365          * make sure we have our local entry in the list,
 366          * but we set service->owner when we're done
 367          * to avoid to many calls to wreplsrv_local_max_version()
 368          */
 369         status = wreplsrv_add_table(service,
 370                                     service, &service->table,
 371                                     service->wins_db->local_owner, 0);
 372         if (!NT_STATUS_IS_OK(status)) goto failed;
 373         local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
 374         if (!local_owner) {
 375                 status = NT_STATUS_INTERNAL_ERROR;
 376                 goto failed;
 377         }
 378
 379         /* find the record in the WINS database */
 380         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE,
 381                          "(objectClass=winsRecord)", attrs, &res);
 382         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 383         if (ret != LDB_SUCCESS) goto failed;
 384         talloc_steal(tmp_ctx, res);
 385
 386         for (i=0; i < res->count; i++) {
 387                 wins_owner     = ldb_msg_find_attr_as_string(res->msgs[i], "winsOwner", NULL);
 388                 version        = ldb_msg_find_attr_as_uint64(res->msgs[i], "versionID", 0);
 389
 390                 status = wreplsrv_add_table(service,
 391                                             service, &service->table,
 392                                             wins_owner, version);
 393                 if (!NT_STATUS_IS_OK(status)) goto failed;
 394                 talloc_free(res->msgs[i]);
 395         }
 396
 397         /*
 398          * this makes sure we call wreplsrv_local_max_version() before returning in
 399          * wreplsrv_find_owner()
 400          */
 401         service->owner = local_owner;
 402
 403         /*
 404          * this makes sure the maxVersion in the database is updated,
 405          * with the highest version we found, if this is higher than the current stored one
 406          */
 407         status = wreplsrv_add_table(service,
 408                                     service, &service->table,
 409                                     service->wins_db->local_owner, local_owner->owner.max_version);
 410         if (!NT_STATUS_IS_OK(status)) goto failed;
 411
 412         talloc_free(tmp_ctx);
 413         return NT_STATUS_OK;
 414 failed:
 415         talloc_free(tmp_ctx);
 416         return status;
 417 }
 418
 419 /*
 420   setup our replication partners
 421 */
 422 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 423 {
 424         NTSTATUS status;
 425
 426         status = wreplsrv_load_partners(service);
 427         NT_STATUS_NOT_OK_RETURN(status);
 428
 429         status = wreplsrv_load_table(service);
 430         NT_STATUS_NOT_OK_RETURN(status);
 431
 432         return NT_STATUS_OK;
 433 }
 434
 435 /*
 436   startup the wrepl task
 437 */
 438 static void wreplsrv_task_init(struct task_server *task)
 439 {
 440         NTSTATUS status;
 441         struct wreplsrv_service *service;
 442
 443         task_server_set_title(task, "task[wreplsrv]");
 444
 445         service = talloc_zero(task, struct wreplsrv_service);
 446         if (!service) {
 447                 task_server_terminate(task, "wreplsrv_task_init: out of memory");
 448                 return;
 449         }
 450         service->task           = task;
 451         service->startup_time   = timeval_current();
 452         task->private           = service;
 453
 454         /*
 455          * setup up all partners, and open the winsdb
 456          */
 457         status = wreplsrv_open_winsdb(service);
 458         if (!NT_STATUS_IS_OK(status)) {
 459                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed");
 460                 return;
 461         }
 462
 463         /*
 464          * setup timed events for each partner we want to pull from
 465          */
 466         status = wreplsrv_setup_partners(service);
 467         if (!NT_STATUS_IS_OK(status)) {
 468                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed");
 469                 return;
 470         }
 471
 472         /*
 473          * setup listen sockets, so we can anwser requests from our partners,
 474          * which pull from us
 475          */
 476         status = wreplsrv_setup_sockets(service);
 477         if (!NT_STATUS_IS_OK(status)) {
 478                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
 479                 return;
 480         }
 481
 482         status = wreplsrv_setup_periodic(service);
 483         if (!NT_STATUS_IS_OK(status)) {
 484                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed");
 485                 return;
 486         }
 487
 488         irpc_add_name(task->msg_ctx, "wrepl_server");
 489 }
 490
 491 /*
 492   initialise the WREPL server
 493  */
 494 static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
 495 {
 496         if (!lp_wins_support()) {
 497                 return NT_STATUS_OK;
 498         }
 499
 500         return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
 501 }
 502
 503 /*
 504   register ourselves as a available server
 505 */
 506 NTSTATUS server_service_wrepl_init(void)
 507 {
 508         return register_server_service("wrepl", wreplsrv_init);
 509 }