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 "ldb_wrap.h"
  34 #include "param/param.h"
  35
  36 static struct ldb_context *wins_config_db_connect(TALLOC_CTX *mem_ctx,
  37                                                   struct loadparm_context *lp_ctx)
  38 {
  39         return ldb_wrap_connect(mem_ctx, lp_ctx, private_path(mem_ctx,
  40                                 lp_ctx, lp_wins_config_url(lp_ctx)),
  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                                      struct loadparm_context *lp_ctx)
  76 {
  77         service->wins_db     = winsdb_connect(service, WINSDB_HANDLE_CALLER_WREPL);
  78         if (!service->wins_db) {
  79                 return NT_STATUS_INTERNAL_DB_ERROR;
  80         }
  81
  82         service->config.ldb = wins_config_db_connect(service, lp_ctx);
  83         if (!service->config.ldb) {
  84                 return NT_STATUS_INTERNAL_DB_ERROR;
  85         }
  86
  87         /* the default renew interval is 6 days */
  88         service->config.renew_interval    = lp_parm_int(lp_ctx, NULL,"wreplsrv","renew_interval", 6*24*60*60);
  89
  90         /* the default tombstone (extinction) interval is 6 days */
  91         service->config.tombstone_interval= lp_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_interval", 6*24*60*60);
  92
  93         /* the default tombstone (extinction) timeout is 1 day */
  94         service->config.tombstone_timeout = lp_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_timeout", 1*24*60*60);
  95
  96         /* the default tombstone extra timeout is 3 days */
  97         service->config.tombstone_extra_timeout = lp_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_extra_timeout", 3*24*60*60);
  98
  99         /* the default verify interval is 24 days */
 100         service->config.verify_interval   = lp_parm_int(lp_ctx, NULL,"wreplsrv","verify_interval", 24*24*60*60);
 101
 102         /* the default scavenging interval is 'renew_interval/2' */
 103         service->config.scavenging_interval=lp_parm_int(lp_ctx, NULL,"wreplsrv","scavenging_interval",
 104                                                         service->config.renew_interval/2);
 105
 106         /* the maximun interval to the next periodic processing event */
 107         service->config.periodic_interval = lp_parm_int(lp_ctx, NULL,"wreplsrv","periodic_interval", 15);
 108
 109         return NT_STATUS_OK;
 110 }
 111
 112 struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
 113 {
 114         struct wreplsrv_partner *cur;
 115
 116         for (cur = service->partners; cur; cur = cur->next) {
 117                 if (strcmp(cur->address, peer_addr) == 0) {
 118                         return cur;
 119                 }
 120         }
 121
 122         return NULL;
 123 }
 124
 125 /*
 126   load our replication partners
 127 */
 128 NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
 129 {
 130         struct wreplsrv_partner *partner;
 131         struct ldb_result *res = NULL;
 132         int ret;
 133         TALLOC_CTX *tmp_ctx;
 134         int i;
 135         uint64_t new_seqnumber;
 136
 137         new_seqnumber = wins_config_db_get_seqnumber(service->config.ldb);
 138
 139         /* if it's not the first run and nothing changed we're done */
 140         if (service->config.seqnumber != 0 && service->config.seqnumber == new_seqnumber) {
 141                 return NT_STATUS_OK;
 142         }
 143
 144         tmp_ctx = talloc_new(service);
 145         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
 146
 147         service->config.seqnumber = new_seqnumber;
 148
 149         /* find the record in the WINS database */
 150         ret = ldb_search(service->config.ldb, ldb_dn_new(tmp_ctx, service->config.ldb, "CN=PARTNERS"), LDB_SCOPE_SUBTREE,
 151                          "(objectClass=wreplPartner)", NULL, &res);
 152         if (ret != LDB_SUCCESS) goto failed;
 153         talloc_steal(tmp_ctx, res);
 154
 155         /* first disable all existing partners */
 156         for (partner=service->partners; partner; partner = partner->next) {
 157                 partner->type = WINSREPL_PARTNER_NONE;
 158         }
 159
 160         for (i=0; i < res->count; i++) {
 161                 const char *address;
 162
 163                 address = ldb_msg_find_attr_as_string(res->msgs[i], "address", NULL);
 164                 if (!address) {
 165                         goto failed;
 166                 }
 167
 168                 partner = wreplsrv_find_partner(service, address);
 169                 if (partner) {
 170                         if (partner->name != partner->address) {
 171                                 talloc_free(discard_const(partner->name));
 172                         }
 173                         partner->name = NULL;
 174                         talloc_free(discard_const(partner->our_address));
 175                         partner->our_address = NULL;
 176
 177                         /* force rescheduling of pulling */
 178                         partner->pull.next_run = timeval_zero();
 179                 } else {
 180                         partner = talloc_zero(service, struct wreplsrv_partner);
 181                         if (partner == NULL) goto failed;
 182
 183                         partner->service = service;
 184                         partner->address = address;
 185                         talloc_steal(partner, partner->address);
 186
 187                         DLIST_ADD_END(service->partners, partner, struct wreplsrv_partner *);
 188                 }
 189
 190                 partner->name                   = ldb_msg_find_attr_as_string(res->msgs[i], "name", partner->address);
 191                 talloc_steal(partner, partner->name);
 192                 partner->our_address            = ldb_msg_find_attr_as_string(res->msgs[i], "ourAddress", NULL);
 193                 talloc_steal(partner, partner->our_address);
 194
 195                 partner->type                   = ldb_msg_find_attr_as_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
 196                 partner->pull.interval          = ldb_msg_find_attr_as_uint(res->msgs[i], "pullInterval",
 197                                                                     WINSREPL_DEFAULT_PULL_INTERVAL);
 198                 partner->pull.retry_interval    = ldb_msg_find_attr_as_uint(res->msgs[i], "pullRetryInterval",
 199                                                                     WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
 200                 partner->push.change_count      = ldb_msg_find_attr_as_uint(res->msgs[i], "pushChangeCount",
 201                                                                     WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
 202                 partner->push.use_inform        = ldb_msg_find_attr_as_uint(res->msgs[i], "pushUseInform", false);
 203
 204                 DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
 205                         partner->address, partner->type));
 206         }
 207
 208         DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
 209                 res->count, (unsigned long long)service->config.seqnumber));
 210
 211         talloc_free(tmp_ctx);
 212         return NT_STATUS_OK;
 213 failed:
 214         talloc_free(tmp_ctx);
 215         return NT_STATUS_FOOBAR;
 216 }
 217
 218 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 219                                    TALLOC_CTX *mem_ctx,
 220                                    struct wrepl_table *table_out,
 221                                    const char *initiator,
 222                                    bool full_table)
 223 {
 224         struct wreplsrv_owner *cur;
 225         uint32_t i = 0;
 226
 227         table_out->partner_count        = 0;
 228         table_out->partners             = NULL;
 229         table_out->initiator            = initiator;
 230
 231         for (cur = service->table; cur; cur = cur->next) {
 232                 if (full_table) {
 233                         table_out->partner_count++;
 234                         continue;
 235                 }
 236
 237                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 238
 239                 table_out->partner_count++;
 240                 break;
 241         }
 242
 243         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 244         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 245
 246         for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
 247                 /*
 248                  * if it's our local entry
 249                  * update the max version
 250                  */
 251                 if (cur == service->owner) {
 252                         cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 253                 }
 254
 255                 if (full_table) {
 256                         table_out->partners[i] = cur->owner;
 257                         i++;
 258                         continue;
 259                 }
 260
 261                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 262
 263                 table_out->partners[i] = cur->owner;
 264                 i++;
 265                 break;
 266         }
 267
 268         return NT_STATUS_OK;
 269 }
 270
 271 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
 272                                            struct wreplsrv_owner *table,
 273                                            const char *wins_owner)
 274 {
 275         struct wreplsrv_owner *cur;
 276
 277         for (cur = table; cur; cur = cur->next) {
 278                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 279                         /*
 280                          * if it's our local entry
 281                          * update the max version
 282                          */
 283                         if (cur == service->owner) {
 284                                 cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 285                         }
 286                         return cur;
 287                 }
 288         }
 289
 290         return NULL;
 291 }
 292
 293 /*
 294  update the wins_owner_table max_version, if the given version is the highest version
 295  if no entry for the wins_owner exists yet, create one
 296 */
 297 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 298                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 299                             const char *wins_owner, uint64_t version)
 300 {
 301         struct wreplsrv_owner *table = *_table;
 302         struct wreplsrv_owner *cur;
 303
 304         if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
 305                 wins_owner = service->wins_db->local_owner;
 306         }
 307
 308         cur = wreplsrv_find_owner(service, table, wins_owner);
 309
 310         /* if it doesn't exists yet, create one */
 311         if (!cur) {
 312                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 313                 NT_STATUS_HAVE_NO_MEMORY(cur);
 314
 315                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 316                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 317                 cur->owner.min_version  = 0;
 318                 cur->owner.max_version  = 0;
 319                 cur->owner.type         = 1; /* don't know why this is always 1 */
 320
 321                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 322
 323                 DLIST_ADD_END(table, cur, struct wreplsrv_owner *);
 324                 *_table = table;
 325         }
 326
 327         /* the min_version is always 0 here, and won't be updated */
 328
 329         /* if the given version is higher than the current max_version, update */
 330         if (cur->owner.max_version < version) {
 331                 cur->owner.max_version = version;
 332                 /* if it's for our local db, we need to update the wins.ldb too */
 333                 if (cur == service->owner) {
 334                         uint64_t ret;
 335                         ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
 336                         if (ret != cur->owner.max_version) {
 337                                 DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
 338                                          (unsigned long long)cur->owner.max_version,
 339                                          (unsigned long long)ret));
 340                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 341                         }
 342                 }
 343         }
 344
 345         return NT_STATUS_OK;
 346 }
 347
 348 /*
 349   load the partner table
 350 */
 351 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 352 {
 353         struct ldb_result *res = NULL;
 354         int ret;
 355         NTSTATUS status;
 356         TALLOC_CTX *tmp_ctx = talloc_new(service);
 357         struct ldb_context *ldb = service->wins_db->ldb;
 358         int i;
 359         struct wreplsrv_owner *local_owner;
 360         const char *wins_owner;
 361         uint64_t version;
 362         const char * const attrs[] = {
 363                 "winsOwner",
 364                 "versionID",
 365                 NULL
 366         };
 367
 368         /*
 369          * make sure we have our local entry in the list,
 370          * but we set service->owner when we're done
 371          * to avoid to many calls to wreplsrv_local_max_version()
 372          */
 373         status = wreplsrv_add_table(service,
 374                                     service, &service->table,
 375                                     service->wins_db->local_owner, 0);
 376         if (!NT_STATUS_IS_OK(status)) goto failed;
 377         local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
 378         if (!local_owner) {
 379                 status = NT_STATUS_INTERNAL_ERROR;
 380                 goto failed;
 381         }
 382
 383         /* find the record in the WINS database */
 384         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE,
 385                          "(objectClass=winsRecord)", attrs, &res);
 386         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 387         if (ret != LDB_SUCCESS) goto failed;
 388         talloc_steal(tmp_ctx, res);
 389
 390         for (i=0; i < res->count; i++) {
 391                 wins_owner     = ldb_msg_find_attr_as_string(res->msgs[i], "winsOwner", NULL);
 392                 version        = ldb_msg_find_attr_as_uint64(res->msgs[i], "versionID", 0);
 393
 394                 status = wreplsrv_add_table(service,
 395                                             service, &service->table,
 396                                             wins_owner, version);
 397                 if (!NT_STATUS_IS_OK(status)) goto failed;
 398                 talloc_free(res->msgs[i]);
 399         }
 400
 401         /*
 402          * this makes sure we call wreplsrv_local_max_version() before returning in
 403          * wreplsrv_find_owner()
 404          */
 405         service->owner = local_owner;
 406
 407         /*
 408          * this makes sure the maxVersion in the database is updated,
 409          * with the highest version we found, if this is higher than the current stored one
 410          */
 411         status = wreplsrv_add_table(service,
 412                                     service, &service->table,
 413                                     service->wins_db->local_owner, local_owner->owner.max_version);
 414         if (!NT_STATUS_IS_OK(status)) goto failed;
 415
 416         talloc_free(tmp_ctx);
 417         return NT_STATUS_OK;
 418 failed:
 419         talloc_free(tmp_ctx);
 420         return status;
 421 }
 422
 423 /*
 424   setup our replication partners
 425 */
 426 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 427 {
 428         NTSTATUS status;
 429
 430         status = wreplsrv_load_partners(service);
 431         NT_STATUS_NOT_OK_RETURN(status);
 432
 433         status = wreplsrv_load_table(service);
 434         NT_STATUS_NOT_OK_RETURN(status);
 435
 436         return NT_STATUS_OK;
 437 }
 438
 439 /*
 440   startup the wrepl task
 441 */
 442 static void wreplsrv_task_init(struct task_server *task)
 443 {
 444         NTSTATUS status;
 445         struct wreplsrv_service *service;
 446
 447         task_server_set_title(task, "task[wreplsrv]");
 448
 449         service = talloc_zero(task, struct wreplsrv_service);
 450         if (!service) {
 451                 task_server_terminate(task, "wreplsrv_task_init: out of memory");
 452                 return;
 453         }
 454         service->task           = task;
 455         service->startup_time   = timeval_current();
 456         task->private           = service;
 457
 458         /*
 459          * setup up all partners, and open the winsdb
 460          */
 461         status = wreplsrv_open_winsdb(service, task->lp_ctx);
 462         if (!NT_STATUS_IS_OK(status)) {
 463                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed");
 464                 return;
 465         }
 466
 467         /*
 468          * setup timed events for each partner we want to pull from
 469          */
 470         status = wreplsrv_setup_partners(service);
 471         if (!NT_STATUS_IS_OK(status)) {
 472                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed");
 473                 return;
 474         }
 475
 476         /*
 477          * setup listen sockets, so we can anwser requests from our partners,
 478          * which pull from us
 479          */
 480         status = wreplsrv_setup_sockets(service);
 481         if (!NT_STATUS_IS_OK(status)) {
 482                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
 483                 return;
 484         }
 485
 486         status = wreplsrv_setup_periodic(service);
 487         if (!NT_STATUS_IS_OK(status)) {
 488                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed");
 489                 return;
 490         }
 491
 492         irpc_add_name(task->msg_ctx, "wrepl_server");
 493 }
 494
 495 /*
 496   initialise the WREPL server
 497  */
 498 static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
 499 {
 500         if (!lp_wins_support(global_loadparm)) {
 501                 return NT_STATUS_OK;
 502         }
 503
 504         return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
 505 }
 506
 507 /*
 508   register ourselves as a available server
 509 */
 510 NTSTATUS server_service_wrepl_init(void)
 511 {
 512         return register_server_service("wrepl", wreplsrv_init);
 513 }