source/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 #include "param/param.h"
  35
  36 static struct ldb_context *wins_config_db_connect(TALLOC_CTX *mem_ctx)
  37 {
  38         return ldb_wrap_connect(mem_ctx, global_loadparm, private_path(mem_ctx,
  39                                 global_loadparm,
  40                                 lp_wins_config_url(global_loadparm)),
  41                                 system_session(mem_ctx), NULL, 0, NULL);
  42 }
  43
  44 static uint64_t wins_config_db_get_seqnumber(struct ldb_context *ldb)
  45 {
  46         int ret;
  47         struct ldb_dn *dn;
  48         struct ldb_result *res = NULL;
  49         TALLOC_CTX *tmp_ctx = talloc_new(ldb);
  50         uint64_t seqnumber = 0;
  51
  52         dn = ldb_dn_new(tmp_ctx, ldb, "@BASEINFO");
  53         if (!dn) goto failed;
  54
  55         /* find the record in the WINS database */
  56         ret = ldb_search(ldb, dn, LDB_SCOPE_BASE,
  57                          NULL, NULL, &res);
  58         if (ret != LDB_SUCCESS) goto failed;
  59         talloc_steal(tmp_ctx, res);
  60         if (res->count > 1) goto failed;
  61
  62         if (res->count == 1) {
  63                 seqnumber = ldb_msg_find_attr_as_uint64(res->msgs[0], "sequenceNumber", 0);
  64         }
  65
  66 failed:
  67         talloc_free(tmp_ctx);
  68         return seqnumber;
  69 }
  70
  71 /*
  72   open winsdb
  73 */
  74 static NTSTATUS wreplsrv_open_winsdb(struct wreplsrv_service *service)
  75 {
  76         service->wins_db     = winsdb_connect(service, WINSDB_HANDLE_CALLER_WREPL);
  77         if (!service->wins_db) {
  78                 return NT_STATUS_INTERNAL_DB_ERROR;
  79         }
  80
  81         service->config.ldb = wins_config_db_connect(service);
  82         if (!service->config.ldb) {
  83                 return NT_STATUS_INTERNAL_DB_ERROR;
  84         }
  85
  86         /* the default renew interval is 6 days */
  87         service->config.renew_interval    = lp_parm_int(global_loadparm, NULL,"wreplsrv","renew_interval", 6*24*60*60);
  88
  89         /* the default tombstone (extinction) interval is 6 days */
  90         service->config.tombstone_interval= lp_parm_int(global_loadparm, NULL,"wreplsrv","tombstone_interval", 6*24*60*60);
  91
  92         /* the default tombstone (extinction) timeout is 1 day */
  93         service->config.tombstone_timeout = lp_parm_int(global_loadparm, NULL,"wreplsrv","tombstone_timeout", 1*24*60*60);
  94
  95         /* the default tombstone extra timeout is 3 days */
  96         service->config.tombstone_extra_timeout = lp_parm_int(global_loadparm, NULL,"wreplsrv","tombstone_extra_timeout", 3*24*60*60);
  97
  98         /* the default verify interval is 24 days */
  99         service->config.verify_interval   = lp_parm_int(global_loadparm, NULL,"wreplsrv","verify_interval", 24*24*60*60);
 100
 101         /* the default scavenging interval is 'renew_interval/2' */
 102         service->config.scavenging_interval=lp_parm_int(global_loadparm, NULL,"wreplsrv","scavenging_interval",
 103                                                         service->config.renew_interval/2);
 104
 105         /* the maximun interval to the next periodic processing event */
 106         service->config.periodic_interval = lp_parm_int(global_loadparm, NULL,"wreplsrv","periodic_interval", 15);
 107
 108         return NT_STATUS_OK;
 109 }
 110
 111 struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
 112 {
 113         struct wreplsrv_partner *cur;
 114
 115         for (cur = service->partners; cur; cur = cur->next) {
 116                 if (strcmp(cur->address, peer_addr) == 0) {
 117                         return cur;
 118                 }
 119         }
 120
 121         return NULL;
 122 }
 123
 124 /*
 125   load our replication partners
 126 */
 127 NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
 128 {
 129         struct wreplsrv_partner *partner;
 130         struct ldb_result *res = NULL;
 131         int ret;
 132         TALLOC_CTX *tmp_ctx;
 133         int i;
 134         uint64_t new_seqnumber;
 135
 136         new_seqnumber = wins_config_db_get_seqnumber(service->config.ldb);
 137
 138         /* if it's not the first run and nothing changed we're done */
 139         if (service->config.seqnumber != 0 && service->config.seqnumber == new_seqnumber) {
 140                 return NT_STATUS_OK;
 141         }
 142
 143         tmp_ctx = talloc_new(service);
 144         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
 145
 146         service->config.seqnumber = new_seqnumber;
 147
 148         /* find the record in the WINS database */
 149         ret = ldb_search(service->config.ldb, ldb_dn_new(tmp_ctx, service->config.ldb, "CN=PARTNERS"), LDB_SCOPE_SUBTREE,
 150                          "(objectClass=wreplPartner)", NULL, &res);
 151         if (ret != LDB_SUCCESS) goto failed;
 152         talloc_steal(tmp_ctx, res);
 153
 154         /* first disable all existing partners */
 155         for (partner=service->partners; partner; partner = partner->next) {
 156                 partner->type = WINSREPL_PARTNER_NONE;
 157         }
 158
 159         for (i=0; i < res->count; i++) {
 160                 const char *address;
 161
 162                 address = ldb_msg_find_attr_as_string(res->msgs[i], "address", NULL);
 163                 if (!address) {
 164                         goto failed;
 165                 }
 166
 167                 partner = wreplsrv_find_partner(service, address);
 168                 if (partner) {
 169                         if (partner->name != partner->address) {
 170                                 talloc_free(discard_const(partner->name));
 171                         }
 172                         partner->name = NULL;
 173                         talloc_free(discard_const(partner->our_address));
 174                         partner->our_address = NULL;
 175
 176                         /* force rescheduling of pulling */
 177                         partner->pull.next_run = timeval_zero();
 178                 } else {
 179                         partner = talloc_zero(service, struct wreplsrv_partner);
 180                         if (partner == NULL) goto failed;
 181
 182                         partner->service = service;
 183                         partner->address = address;
 184                         talloc_steal(partner, partner->address);
 185
 186                         DLIST_ADD_END(service->partners, partner, struct wreplsrv_partner *);
 187                 }
 188
 189                 partner->name                   = ldb_msg_find_attr_as_string(res->msgs[i], "name", partner->address);
 190                 talloc_steal(partner, partner->name);
 191                 partner->our_address            = ldb_msg_find_attr_as_string(res->msgs[i], "ourAddress", NULL);
 192                 talloc_steal(partner, partner->our_address);
 193
 194                 partner->type                   = ldb_msg_find_attr_as_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
 195                 partner->pull.interval          = ldb_msg_find_attr_as_uint(res->msgs[i], "pullInterval",
 196                                                                     WINSREPL_DEFAULT_PULL_INTERVAL);
 197                 partner->pull.retry_interval    = ldb_msg_find_attr_as_uint(res->msgs[i], "pullRetryInterval",
 198                                                                     WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
 199                 partner->push.change_count      = ldb_msg_find_attr_as_uint(res->msgs[i], "pushChangeCount",
 200                                                                     WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
 201                 partner->push.use_inform        = ldb_msg_find_attr_as_uint(res->msgs[i], "pushUseInform", false);
 202
 203                 DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
 204                         partner->address, partner->type));
 205         }
 206
 207         DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
 208                 res->count, (unsigned long long)service->config.seqnumber));
 209
 210         talloc_free(tmp_ctx);
 211         return NT_STATUS_OK;
 212 failed:
 213         talloc_free(tmp_ctx);
 214         return NT_STATUS_FOOBAR;
 215 }
 216
 217 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 218                                    TALLOC_CTX *mem_ctx,
 219                                    struct wrepl_table *table_out,
 220                                    const char *initiator,
 221                                    bool full_table)
 222 {
 223         struct wreplsrv_owner *cur;
 224         uint32_t i = 0;
 225
 226         table_out->partner_count        = 0;
 227         table_out->partners             = NULL;
 228         table_out->initiator            = initiator;
 229
 230         for (cur = service->table; cur; cur = cur->next) {
 231                 if (full_table) {
 232                         table_out->partner_count++;
 233                         continue;
 234                 }
 235
 236                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 237
 238                 table_out->partner_count++;
 239                 break;
 240         }
 241
 242         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 243         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 244
 245         for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
 246                 /*
 247                  * if it's our local entry
 248                  * update the max version
 249                  */
 250                 if (cur == service->owner) {
 251                         cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 252                 }
 253
 254                 if (full_table) {
 255                         table_out->partners[i] = cur->owner;
 256                         i++;
 257                         continue;
 258                 }
 259
 260                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 261
 262                 table_out->partners[i] = cur->owner;
 263                 i++;
 264                 break;
 265         }
 266
 267         return NT_STATUS_OK;
 268 }
 269
 270 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
 271                                            struct wreplsrv_owner *table,
 272                                            const char *wins_owner)
 273 {
 274         struct wreplsrv_owner *cur;
 275
 276         for (cur = table; cur; cur = cur->next) {
 277                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 278                         /*
 279                          * if it's our local entry
 280                          * update the max version
 281                          */
 282                         if (cur == service->owner) {
 283                                 cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 284                         }
 285                         return cur;
 286                 }
 287         }
 288
 289         return NULL;
 290 }
 291
 292 /*
 293  update the wins_owner_table max_version, if the given version is the highest version
 294  if no entry for the wins_owner exists yet, create one
 295 */
 296 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 297                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 298                             const char *wins_owner, uint64_t version)
 299 {
 300         struct wreplsrv_owner *table = *_table;
 301         struct wreplsrv_owner *cur;
 302
 303         if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
 304                 wins_owner = service->wins_db->local_owner;
 305         }
 306
 307         cur = wreplsrv_find_owner(service, table, wins_owner);
 308
 309         /* if it doesn't exists yet, create one */
 310         if (!cur) {
 311                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 312                 NT_STATUS_HAVE_NO_MEMORY(cur);
 313
 314                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 315                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 316                 cur->owner.min_version  = 0;
 317                 cur->owner.max_version  = 0;
 318                 cur->owner.type         = 1; /* don't know why this is always 1 */
 319
 320                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 321
 322                 DLIST_ADD_END(table, cur, struct wreplsrv_owner *);
 323                 *_table = table;
 324         }
 325
 326         /* the min_version is always 0 here, and won't be updated */
 327
 328         /* if the given version is higher than the current max_version, update */
 329         if (cur->owner.max_version < version) {
 330                 cur->owner.max_version = version;
 331                 /* if it's for our local db, we need to update the wins.ldb too */
 332                 if (cur == service->owner) {
 333                         uint64_t ret;
 334                         ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
 335                         if (ret != cur->owner.max_version) {
 336                                 DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
 337                                          (unsigned long long)cur->owner.max_version,
 338                                          (unsigned long long)ret));
 339                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 340                         }
 341                 }
 342         }
 343
 344         return NT_STATUS_OK;
 345 }
 346
 347 /*
 348   load the partner table
 349 */
 350 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 351 {
 352         struct ldb_result *res = NULL;
 353         int ret;
 354         NTSTATUS status;
 355         TALLOC_CTX *tmp_ctx = talloc_new(service);
 356         struct ldb_context *ldb = service->wins_db->ldb;
 357         int i;
 358         struct wreplsrv_owner *local_owner;
 359         const char *wins_owner;
 360         uint64_t version;
 361         const char * const attrs[] = {
 362                 "winsOwner",
 363                 "versionID",
 364                 NULL
 365         };
 366
 367         /*
 368          * make sure we have our local entry in the list,
 369          * but we set service->owner when we're done
 370          * to avoid to many calls to wreplsrv_local_max_version()
 371          */
 372         status = wreplsrv_add_table(service,
 373                                     service, &service->table,
 374                                     service->wins_db->local_owner, 0);
 375         if (!NT_STATUS_IS_OK(status)) goto failed;
 376         local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
 377         if (!local_owner) {
 378                 status = NT_STATUS_INTERNAL_ERROR;
 379                 goto failed;
 380         }
 381
 382         /* find the record in the WINS database */
 383         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE,
 384                          "(objectClass=winsRecord)", attrs, &res);
 385         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 386         if (ret != LDB_SUCCESS) goto failed;
 387         talloc_steal(tmp_ctx, res);
 388
 389         for (i=0; i < res->count; i++) {
 390                 wins_owner     = ldb_msg_find_attr_as_string(res->msgs[i], "winsOwner", NULL);
 391                 version        = ldb_msg_find_attr_as_uint64(res->msgs[i], "versionID", 0);
 392
 393                 status = wreplsrv_add_table(service,
 394                                             service, &service->table,
 395                                             wins_owner, version);
 396                 if (!NT_STATUS_IS_OK(status)) goto failed;
 397                 talloc_free(res->msgs[i]);
 398         }
 399
 400         /*
 401          * this makes sure we call wreplsrv_local_max_version() before returning in
 402          * wreplsrv_find_owner()
 403          */
 404         service->owner = local_owner;
 405
 406         /*
 407          * this makes sure the maxVersion in the database is updated,
 408          * with the highest version we found, if this is higher than the current stored one
 409          */
 410         status = wreplsrv_add_table(service,
 411                                     service, &service->table,
 412                                     service->wins_db->local_owner, local_owner->owner.max_version);
 413         if (!NT_STATUS_IS_OK(status)) goto failed;
 414
 415         talloc_free(tmp_ctx);
 416         return NT_STATUS_OK;
 417 failed:
 418         talloc_free(tmp_ctx);
 419         return status;
 420 }
 421
 422 /*
 423   setup our replication partners
 424 */
 425 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 426 {
 427         NTSTATUS status;
 428
 429         status = wreplsrv_load_partners(service);
 430         NT_STATUS_NOT_OK_RETURN(status);
 431
 432         status = wreplsrv_load_table(service);
 433         NT_STATUS_NOT_OK_RETURN(status);
 434
 435         return NT_STATUS_OK;
 436 }
 437
 438 /*
 439   startup the wrepl task
 440 */
 441 static void wreplsrv_task_init(struct task_server *task)
 442 {
 443         NTSTATUS status;
 444         struct wreplsrv_service *service;
 445
 446         task_server_set_title(task, "task[wreplsrv]");
 447
 448         service = talloc_zero(task, struct wreplsrv_service);
 449         if (!service) {
 450                 task_server_terminate(task, "wreplsrv_task_init: out of memory");
 451                 return;
 452         }
 453         service->task           = task;
 454         service->startup_time   = timeval_current();
 455         task->private           = service;
 456
 457         /*
 458          * setup up all partners, and open the winsdb
 459          */
 460         status = wreplsrv_open_winsdb(service);
 461         if (!NT_STATUS_IS_OK(status)) {
 462                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed");
 463                 return;
 464         }
 465
 466         /*
 467          * setup timed events for each partner we want to pull from
 468          */
 469         status = wreplsrv_setup_partners(service);
 470         if (!NT_STATUS_IS_OK(status)) {
 471                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed");
 472                 return;
 473         }
 474
 475         /*
 476          * setup listen sockets, so we can anwser requests from our partners,
 477          * which pull from us
 478          */
 479         status = wreplsrv_setup_sockets(service);
 480         if (!NT_STATUS_IS_OK(status)) {
 481                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
 482                 return;
 483         }
 484
 485         status = wreplsrv_setup_periodic(service);
 486         if (!NT_STATUS_IS_OK(status)) {
 487                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed");
 488                 return;
 489         }
 490
 491         irpc_add_name(task->msg_ctx, "wrepl_server");
 492 }
 493
 494 /*
 495   initialise the WREPL server
 496  */
 497 static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
 498 {
 499         if (!lp_wins_support(global_loadparm)) {
 500                 return NT_STATUS_OK;
 501         }
 502
 503         return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
 504 }
 505
 506 /*
 507   register ourselves as a available server
 508 */
 509 NTSTATUS server_service_wrepl_init(void)
 510 {
 511         return register_server_service("wrepl", wreplsrv_init);
 512 }