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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "dlinklist.h"
  25 #include "smbd/service_task.h"
  26 #include "lib/messaging/irpc.h"
  27 #include "librpc/gen_ndr/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
  34 static struct ldb_context *wins_config_db_connect(TALLOC_CTX *mem_ctx)
  35 {
  36         return ldb_wrap_connect(mem_ctx, private_path(mem_ctx, lp_wins_config_url()),
  37                                 system_session(mem_ctx), NULL, 0, NULL);
  38 }
  39
  40 static uint64_t wins_config_db_get_seqnumber(struct ldb_context *ldb)
  41 {
  42         int ret;
  43         struct ldb_dn *dn;
  44         struct ldb_result *res = NULL;
  45         TALLOC_CTX *tmp_ctx = talloc_new(ldb);
  46         uint64_t seqnumber = 0;
  47
  48         dn = ldb_dn_explode(tmp_ctx, "@BASEINFO");
  49         if (!dn) goto failed;
  50
  51         /* find the record in the WINS database */
  52         ret = ldb_search(ldb, dn, LDB_SCOPE_BASE,
  53                          NULL, NULL, &res);
  54         if (ret != LDB_SUCCESS) goto failed;
  55         talloc_steal(tmp_ctx, res);
  56         if (res->count > 1) goto failed;
  57
  58         if (res->count == 1) {
  59                 seqnumber = ldb_msg_find_uint64(res->msgs[0], "sequenceNumber", 0);
  60         }
  61
  62 failed:
  63         talloc_free(tmp_ctx);
  64         return seqnumber;
  65 }
  66
  67 /*
  68   open winsdb
  69 */
  70 static NTSTATUS wreplsrv_open_winsdb(struct wreplsrv_service *service)
  71 {
  72         service->wins_db     = winsdb_connect(service, WINSDB_HANDLE_CALLER_WREPL);
  73         if (!service->wins_db) {
  74                 return NT_STATUS_INTERNAL_DB_ERROR;
  75         }
  76
  77         service->config.ldb = wins_config_db_connect(service);
  78         if (!service->config.ldb) {
  79                 return NT_STATUS_INTERNAL_DB_ERROR;
  80         }
  81
  82         /* the default renew interval is 6 days */
  83         service->config.renew_interval    = lp_parm_int(-1,"wreplsrv","renew_interval", 6*24*60*60);
  84
  85         /* the default tombstone (extinction) interval is 6 days */
  86         service->config.tombstone_interval= lp_parm_int(-1,"wreplsrv","tombstone_interval", 6*24*60*60);
  87
  88         /* the default tombstone (extinction) timeout is 1 day */
  89         service->config.tombstone_timeout = lp_parm_int(-1,"wreplsrv","tombstone_timeout", 1*24*60*60);
  90
  91         /* the default tombstone extra timeout is 3 days */
  92         service->config.tombstone_extra_timeout = lp_parm_int(-1,"wreplsrv","tombstone_extra_timeout", 3*24*60*60);
  93
  94         /* the default verify interval is 24 days */
  95         service->config.verify_interval   = lp_parm_int(-1,"wreplsrv","verify_interval", 24*24*60*60);
  96
  97         /* the default scavenging interval is 'renew_interval/2' */
  98         service->config.scavenging_interval=lp_parm_int(-1,"wreplsrv","scavenging_interval",
  99                                                         service->config.renew_interval/2);
 100
 101         /* the maximun interval to the next periodic processing event */
 102         service->config.periodic_interval = lp_parm_int(-1,"wreplsrv","periodic_interval", 15);
 103
 104         return NT_STATUS_OK;
 105 }
 106
 107 struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
 108 {
 109         struct wreplsrv_partner *cur;
 110
 111         for (cur = service->partners; cur; cur = cur->next) {
 112                 if (strcmp(cur->address, peer_addr) == 0) {
 113                         return cur;
 114                 }
 115         }
 116
 117         return NULL;
 118 }
 119
 120 /*
 121   load our replication partners
 122 */
 123 NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
 124 {
 125         struct wreplsrv_partner *partner;
 126         struct ldb_result *res = NULL;
 127         int ret;
 128         TALLOC_CTX *tmp_ctx = talloc_new(service);
 129         int i;
 130         uint64_t new_seqnumber;
 131
 132         new_seqnumber = wins_config_db_get_seqnumber(service->config.ldb);
 133
 134         /* if it's not the first run and nothing changed we're done */
 135         if (service->config.seqnumber != 0 && service->config.seqnumber == new_seqnumber) {
 136                 return NT_STATUS_OK;
 137         }
 138
 139         service->config.seqnumber = new_seqnumber;
 140
 141         /* find the record in the WINS database */
 142         ret = ldb_search(service->config.ldb, ldb_dn_explode(tmp_ctx, "CN=PARTNERS"), LDB_SCOPE_SUBTREE,
 143                          "(objectClass=wreplPartner)", NULL, &res);
 144         if (ret != LDB_SUCCESS) goto failed;
 145         talloc_steal(tmp_ctx, res);
 146
 147         /* first disable all existing partners */
 148         for (partner=service->partners; partner; partner = partner->next) {
 149                 partner->type = WINSREPL_PARTNER_NONE;
 150         }
 151
 152         for (i=0; i < res->count; i++) {
 153                 const char *address;
 154
 155                 address = ldb_msg_find_string(res->msgs[i], "address", NULL);
 156                 if (!address) {
 157                         goto failed;
 158                 }
 159
 160                 partner = wreplsrv_find_partner(service, address);
 161                 if (partner) {
 162                         if (partner->name != partner->address) {
 163                                 talloc_free(discard_const(partner->name));
 164                         }
 165                         partner->name = NULL;
 166                         talloc_free(discard_const(partner->our_address));
 167                         partner->our_address = NULL;
 168
 169                         /* force rescheduling of pulling */
 170                         partner->pull.next_run = timeval_zero();
 171                 } else {
 172                         partner = talloc_zero(service, struct wreplsrv_partner);
 173                         if (partner == NULL) goto failed;
 174
 175                         partner->service = service;
 176                         partner->address = address;
 177                         talloc_steal(partner, partner->address);
 178
 179                         DLIST_ADD_END(service->partners, partner, struct wreplsrv_partner *);
 180                 }
 181
 182                 partner->name                   = ldb_msg_find_string(res->msgs[i], "name", partner->address);
 183                 talloc_steal(partner, partner->name);
 184                 partner->our_address            = ldb_msg_find_string(res->msgs[i], "ourAddress", NULL);
 185                 talloc_steal(partner, partner->our_address);
 186
 187                 partner->type                   = ldb_msg_find_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
 188                 partner->pull.interval          = ldb_msg_find_uint(res->msgs[i], "pullInterval",
 189                                                                     WINSREPL_DEFAULT_PULL_INTERVAL);
 190                 partner->pull.retry_interval    = ldb_msg_find_uint(res->msgs[i], "pullRetryInterval",
 191                                                                     WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
 192                 partner->push.change_count      = ldb_msg_find_uint(res->msgs[i], "pushChangeCount",
 193                                                                     WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
 194                 partner->push.use_inform        = ldb_msg_find_uint(res->msgs[i], "pushUseInform", False);
 195
 196                 DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
 197                         partner->address, partner->type));
 198         }
 199
 200         DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
 201                 res->count, service->config.seqnumber));
 202
 203         talloc_free(tmp_ctx);
 204         return NT_STATUS_OK;
 205 failed:
 206         talloc_free(tmp_ctx);
 207         return NT_STATUS_FOOBAR;
 208 }
 209
 210 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 211                                    TALLOC_CTX *mem_ctx,
 212                                    struct wrepl_table *table_out,
 213                                    const char *initiator,
 214                                    BOOL full_table)
 215 {
 216         struct wreplsrv_owner *cur;
 217         uint32_t i = 0;
 218
 219         table_out->partner_count        = 0;
 220         table_out->partners             = NULL;
 221         table_out->initiator            = initiator;
 222
 223         for (cur = service->table; cur; cur = cur->next) {
 224                 if (full_table) {
 225                         table_out->partner_count++;
 226                         continue;
 227                 }
 228
 229                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 230
 231                 table_out->partner_count++;
 232                 break;
 233         }
 234
 235         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 236         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 237
 238         for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
 239                 /*
 240                  * if it's our local entry
 241                  * update the max version
 242                  */
 243                 if (cur == service->owner) {
 244                         cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 245                 }
 246
 247                 if (full_table) {
 248                         table_out->partners[i] = cur->owner;
 249                         i++;
 250                         continue;
 251                 }
 252
 253                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 254
 255                 table_out->partners[i] = cur->owner;
 256                 i++;
 257                 break;
 258         }
 259
 260         return NT_STATUS_OK;
 261 }
 262
 263 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
 264                                            struct wreplsrv_owner *table,
 265                                            const char *wins_owner)
 266 {
 267         struct wreplsrv_owner *cur;
 268
 269         for (cur = table; cur; cur = cur->next) {
 270                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 271                         /*
 272                          * if it's our local entry
 273                          * update the max version
 274                          */
 275                         if (cur == service->owner) {
 276                                 cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 277                         }
 278                         return cur;
 279                 }
 280         }
 281
 282         return NULL;
 283 }
 284
 285 /*
 286  update the wins_owner_table max_version, if the given version is the highest version
 287  if no entry for the wins_owner exists yet, create one
 288 */
 289 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 290                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 291                             const char *wins_owner, uint64_t version)
 292 {
 293         struct wreplsrv_owner *table = *_table;
 294         struct wreplsrv_owner *cur;
 295
 296         if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
 297                 wins_owner = service->wins_db->local_owner;
 298         }
 299
 300         cur = wreplsrv_find_owner(service, table, wins_owner);
 301
 302         /* if it doesn't exists yet, create one */
 303         if (!cur) {
 304                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 305                 NT_STATUS_HAVE_NO_MEMORY(cur);
 306
 307                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 308                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 309                 cur->owner.min_version  = 0;
 310                 cur->owner.max_version  = 0;
 311                 cur->owner.type         = 1; /* don't know why this is always 1 */
 312
 313                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 314
 315                 DLIST_ADD_END(table, cur, struct wreplsrv_owner *);
 316                 *_table = table;
 317         }
 318
 319         /* the min_version is always 0 here, and won't be updated */
 320
 321         /* if the given version is higher the then current nax_version, update */
 322         if (cur->owner.max_version < version) {
 323                 cur->owner.max_version = version;
 324                 /* if it's for our local db, we need to update the wins.ldb too */
 325                 if (cur == service->owner) {
 326                         uint64_t ret;
 327                         ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
 328                         if (ret != cur->owner.max_version) {
 329                                 DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
 330                                         cur->owner.max_version, ret));
 331                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 332                         }
 333                 }
 334         }
 335
 336         return NT_STATUS_OK;
 337 }
 338
 339 /*
 340   load the partner table
 341 */
 342 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 343 {
 344         struct ldb_result *res = NULL;
 345         int ret;
 346         NTSTATUS status;
 347         TALLOC_CTX *tmp_ctx = talloc_new(service);
 348         struct ldb_context *ldb = service->wins_db->ldb;
 349         int i;
 350         struct wreplsrv_owner *local_owner;
 351         const char *wins_owner;
 352         uint64_t version;
 353         const char * const attrs[] = {
 354                 "winsOwner",
 355                 "versionID",
 356                 NULL
 357         };
 358
 359         /*
 360          * make sure we have our local entry in the list,
 361          * but we set service->owner when we're done
 362          * to avoid to many calls to wreplsrv_local_max_version()
 363          */
 364         status = wreplsrv_add_table(service,
 365                                     service, &service->table,
 366                                     service->wins_db->local_owner, 0);
 367         if (!NT_STATUS_IS_OK(status)) goto failed;
 368         local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
 369         if (!local_owner) {
 370                 status = NT_STATUS_INTERNAL_ERROR;
 371                 goto failed;
 372         }
 373
 374         /* find the record in the WINS database */
 375         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE,
 376                          "(objectClass=winsRecord)", attrs, &res);
 377         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 378         if (ret != LDB_SUCCESS) goto failed;
 379         talloc_steal(tmp_ctx, res);
 380
 381         for (i=0; i < res->count; i++) {
 382                 wins_owner     = ldb_msg_find_string(res->msgs[i], "winsOwner", NULL);
 383                 version        = ldb_msg_find_uint64(res->msgs[i], "versionID", 0);
 384
 385                 status = wreplsrv_add_table(service,
 386                                             service, &service->table,
 387                                             wins_owner, version);
 388                 if (!NT_STATUS_IS_OK(status)) goto failed;
 389                 talloc_free(res->msgs[i]);
 390         }
 391
 392         /*
 393          * this makes sure we call wreplsrv_local_max_version() before returning in
 394          * wreplsrv_find_owner()
 395          */
 396         service->owner = local_owner;
 397
 398         /*
 399          * this makes sure the maxVersion in the database is updated,
 400          * with the highest version we found, if this is higher than the current stored one
 401          */
 402         status = wreplsrv_add_table(service,
 403                                     service, &service->table,
 404                                     service->wins_db->local_owner, local_owner->owner.max_version);
 405         if (!NT_STATUS_IS_OK(status)) goto failed;
 406
 407         talloc_free(tmp_ctx);
 408         return NT_STATUS_OK;
 409 failed:
 410         talloc_free(tmp_ctx);
 411         return status;
 412 }
 413
 414 /*
 415   setup our replication partners
 416 */
 417 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 418 {
 419         NTSTATUS status;
 420
 421         status = wreplsrv_load_partners(service);
 422         NT_STATUS_NOT_OK_RETURN(status);
 423
 424         status = wreplsrv_load_table(service);
 425         NT_STATUS_NOT_OK_RETURN(status);
 426
 427         return NT_STATUS_OK;
 428 }
 429
 430 /*
 431   startup the wrepl task
 432 */
 433 static void wreplsrv_task_init(struct task_server *task)
 434 {
 435         NTSTATUS status;
 436         struct wreplsrv_service *service;
 437
 438         service = talloc_zero(task, struct wreplsrv_service);
 439         if (!service) {
 440                 task_server_terminate(task, "wreplsrv_task_init: out of memory");
 441                 return;
 442         }
 443         service->task           = task;
 444         service->startup_time   = timeval_current();
 445         task->private           = service;
 446
 447         /*
 448          * setup up all partners, and open the winsdb
 449          */
 450         status = wreplsrv_open_winsdb(service);
 451         if (!NT_STATUS_IS_OK(status)) {
 452                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed");
 453                 return;
 454         }
 455
 456         /*
 457          * setup timed events for each partner we want to pull from
 458          */
 459         status = wreplsrv_setup_partners(service);
 460         if (!NT_STATUS_IS_OK(status)) {
 461                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed");
 462                 return;
 463         }
 464
 465         /*
 466          * setup listen sockets, so we can anwser requests from our partners,
 467          * which pull from us
 468          */
 469         status = wreplsrv_setup_sockets(service);
 470         if (!NT_STATUS_IS_OK(status)) {
 471                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
 472                 return;
 473         }
 474
 475         status = wreplsrv_setup_periodic(service);
 476         if (!NT_STATUS_IS_OK(status)) {
 477                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed");
 478                 return;
 479         }
 480
 481         irpc_add_name(task->msg_ctx, "wrepl_server");
 482 }
 483
 484 /*
 485   initialise the WREPL server
 486  */
 487 static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
 488 {
 489         if (!lp_wins_support()) {
 490                 return NT_STATUS_OK;
 491         }
 492
 493         return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
 494 }
 495
 496 /*
 497   register ourselves as a available server
 498 */
 499 NTSTATUS server_service_wrepl_init(void)
 500 {
 501         return register_server_service("wrepl", wreplsrv_init);
 502 }