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 "ldb_wrap.h"
  34 #include "param/param.h"
  35 #include "lib/socket/netif.h"
  36
  37 static struct ldb_context *wins_config_db_connect(TALLOC_CTX *mem_ctx,
  38                                                   struct event_context *ev_ctx,
  39                                                   struct loadparm_context *lp_ctx)
  40 {
  41         return ldb_wrap_connect(mem_ctx, ev_ctx, lp_ctx, private_path(mem_ctx,
  42                                 lp_ctx, lp_wins_config_url(lp_ctx)),
  43                                 system_session(mem_ctx, lp_ctx), NULL, 0, NULL);
  44 }
  45
  46 static uint64_t wins_config_db_get_seqnumber(struct ldb_context *ldb)
  47 {
  48         int ret;
  49         struct ldb_dn *dn;
  50         struct ldb_result *res = NULL;
  51         TALLOC_CTX *tmp_ctx = talloc_new(ldb);
  52         uint64_t seqnumber = 0;
  53
  54         dn = ldb_dn_new(tmp_ctx, ldb, "@BASEINFO");
  55         if (!dn) goto failed;
  56
  57         /* find the record in the WINS database */
  58         ret = ldb_search(ldb, dn, LDB_SCOPE_BASE,
  59                          NULL, NULL, &res);
  60         if (ret != LDB_SUCCESS) goto failed;
  61         talloc_steal(tmp_ctx, res);
  62         if (res->count > 1) goto failed;
  63
  64         if (res->count == 1) {
  65                 seqnumber = ldb_msg_find_attr_as_uint64(res->msgs[0], "sequenceNumber", 0);
  66         }
  67
  68 failed:
  69         talloc_free(tmp_ctx);
  70         return seqnumber;
  71 }
  72
  73 /*
  74   open winsdb
  75 */
  76 static NTSTATUS wreplsrv_open_winsdb(struct wreplsrv_service *service,
  77                                      struct loadparm_context *lp_ctx)
  78 {
  79         const char *owner = lp_parm_string(lp_ctx, NULL, "winsdb", "local_owner");
  80
  81         if (owner == NULL) {
  82                 struct interface *ifaces;
  83                 load_interfaces(service, lp_interfaces(lp_ctx), &ifaces);
  84                 owner = iface_n_ip(ifaces, 0);
  85         }
  86
  87         service->wins_db     = winsdb_connect(service, service->task->event_ctx, lp_ctx, owner, WINSDB_HANDLE_CALLER_WREPL);
  88         if (!service->wins_db) {
  89                 return NT_STATUS_INTERNAL_DB_ERROR;
  90         }
  91
  92         service->config.ldb = wins_config_db_connect(service, service->task->event_ctx, lp_ctx);
  93         if (!service->config.ldb) {
  94                 return NT_STATUS_INTERNAL_DB_ERROR;
  95         }
  96
  97         /* the default renew interval is 6 days */
  98         service->config.renew_interval    = lp_parm_int(lp_ctx, NULL,"wreplsrv","renew_interval", 6*24*60*60);
  99
 100         /* the default tombstone (extinction) interval is 6 days */
 101         service->config.tombstone_interval= lp_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_interval", 6*24*60*60);
 102
 103         /* the default tombstone (extinction) timeout is 1 day */
 104         service->config.tombstone_timeout = lp_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_timeout", 1*24*60*60);
 105
 106         /* the default tombstone extra timeout is 3 days */
 107         service->config.tombstone_extra_timeout = lp_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_extra_timeout", 3*24*60*60);
 108
 109         /* the default verify interval is 24 days */
 110         service->config.verify_interval   = lp_parm_int(lp_ctx, NULL,"wreplsrv","verify_interval", 24*24*60*60);
 111
 112         /* the default scavenging interval is 'renew_interval/2' */
 113         service->config.scavenging_interval=lp_parm_int(lp_ctx, NULL,"wreplsrv","scavenging_interval",
 114                                                         service->config.renew_interval/2);
 115
 116         /* the maximun interval to the next periodic processing event */
 117         service->config.periodic_interval = lp_parm_int(lp_ctx, NULL,"wreplsrv","periodic_interval", 15);
 118
 119         return NT_STATUS_OK;
 120 }
 121
 122 struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
 123 {
 124         struct wreplsrv_partner *cur;
 125
 126         for (cur = service->partners; cur; cur = cur->next) {
 127                 if (strcmp(cur->address, peer_addr) == 0) {
 128                         return cur;
 129                 }
 130         }
 131
 132         return NULL;
 133 }
 134
 135 /*
 136   load our replication partners
 137 */
 138 NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
 139 {
 140         struct wreplsrv_partner *partner;
 141         struct ldb_result *res = NULL;
 142         int ret;
 143         TALLOC_CTX *tmp_ctx;
 144         int i;
 145         uint64_t new_seqnumber;
 146
 147         new_seqnumber = wins_config_db_get_seqnumber(service->config.ldb);
 148
 149         /* if it's not the first run and nothing changed we're done */
 150         if (service->config.seqnumber != 0 && service->config.seqnumber == new_seqnumber) {
 151                 return NT_STATUS_OK;
 152         }
 153
 154         tmp_ctx = talloc_new(service);
 155         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
 156
 157         service->config.seqnumber = new_seqnumber;
 158
 159         /* find the record in the WINS database */
 160         ret = ldb_search(service->config.ldb, ldb_dn_new(tmp_ctx, service->config.ldb, "CN=PARTNERS"), LDB_SCOPE_SUBTREE,
 161                          "(objectClass=wreplPartner)", NULL, &res);
 162         if (ret != LDB_SUCCESS) goto failed;
 163         talloc_steal(tmp_ctx, res);
 164
 165         /* first disable all existing partners */
 166         for (partner=service->partners; partner; partner = partner->next) {
 167                 partner->type = WINSREPL_PARTNER_NONE;
 168         }
 169
 170         for (i=0; i < res->count; i++) {
 171                 const char *address;
 172
 173                 address = ldb_msg_find_attr_as_string(res->msgs[i], "address", NULL);
 174                 if (!address) {
 175                         goto failed;
 176                 }
 177
 178                 partner = wreplsrv_find_partner(service, address);
 179                 if (partner) {
 180                         if (partner->name != partner->address) {
 181                                 talloc_free(discard_const(partner->name));
 182                         }
 183                         partner->name = NULL;
 184                         talloc_free(discard_const(partner->our_address));
 185                         partner->our_address = NULL;
 186
 187                         /* force rescheduling of pulling */
 188                         partner->pull.next_run = timeval_zero();
 189                 } else {
 190                         partner = talloc_zero(service, struct wreplsrv_partner);
 191                         if (partner == NULL) goto failed;
 192
 193                         partner->service = service;
 194                         partner->address = address;
 195                         talloc_steal(partner, partner->address);
 196
 197                         DLIST_ADD_END(service->partners, partner, struct wreplsrv_partner *);
 198                 }
 199
 200                 partner->name                   = ldb_msg_find_attr_as_string(res->msgs[i], "name", partner->address);
 201                 talloc_steal(partner, partner->name);
 202                 partner->our_address            = ldb_msg_find_attr_as_string(res->msgs[i], "ourAddress", NULL);
 203                 talloc_steal(partner, partner->our_address);
 204
 205                 partner->type                   = ldb_msg_find_attr_as_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
 206                 partner->pull.interval          = ldb_msg_find_attr_as_uint(res->msgs[i], "pullInterval",
 207                                                                     WINSREPL_DEFAULT_PULL_INTERVAL);
 208                 partner->pull.retry_interval    = ldb_msg_find_attr_as_uint(res->msgs[i], "pullRetryInterval",
 209                                                                     WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
 210                 partner->push.change_count      = ldb_msg_find_attr_as_uint(res->msgs[i], "pushChangeCount",
 211                                                                     WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
 212                 partner->push.use_inform        = ldb_msg_find_attr_as_uint(res->msgs[i], "pushUseInform", false);
 213
 214                 DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
 215                         partner->address, partner->type));
 216         }
 217
 218         DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
 219                 res->count, (unsigned long long)service->config.seqnumber));
 220
 221         talloc_free(tmp_ctx);
 222         return NT_STATUS_OK;
 223 failed:
 224         talloc_free(tmp_ctx);
 225         return NT_STATUS_FOOBAR;
 226 }
 227
 228 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 229                                    TALLOC_CTX *mem_ctx,
 230                                    struct wrepl_table *table_out,
 231                                    const char *initiator,
 232                                    bool full_table)
 233 {
 234         struct wreplsrv_owner *cur;
 235         uint32_t i = 0;
 236
 237         table_out->partner_count        = 0;
 238         table_out->partners             = NULL;
 239         table_out->initiator            = initiator;
 240
 241         for (cur = service->table; cur; cur = cur->next) {
 242                 if (full_table) {
 243                         table_out->partner_count++;
 244                         continue;
 245                 }
 246
 247                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 248
 249                 table_out->partner_count++;
 250                 break;
 251         }
 252
 253         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 254         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 255
 256         for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
 257                 /*
 258                  * if it's our local entry
 259                  * update the max version
 260                  */
 261                 if (cur == service->owner) {
 262                         cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 263                 }
 264
 265                 if (full_table) {
 266                         table_out->partners[i] = cur->owner;
 267                         i++;
 268                         continue;
 269                 }
 270
 271                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 272
 273                 table_out->partners[i] = cur->owner;
 274                 i++;
 275                 break;
 276         }
 277
 278         return NT_STATUS_OK;
 279 }
 280
 281 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
 282                                            struct wreplsrv_owner *table,
 283                                            const char *wins_owner)
 284 {
 285         struct wreplsrv_owner *cur;
 286
 287         for (cur = table; cur; cur = cur->next) {
 288                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 289                         /*
 290                          * if it's our local entry
 291                          * update the max version
 292                          */
 293                         if (cur == service->owner) {
 294                                 cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 295                         }
 296                         return cur;
 297                 }
 298         }
 299
 300         return NULL;
 301 }
 302
 303 /*
 304  update the wins_owner_table max_version, if the given version is the highest version
 305  if no entry for the wins_owner exists yet, create one
 306 */
 307 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 308                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 309                             const char *wins_owner, uint64_t version)
 310 {
 311         struct wreplsrv_owner *table = *_table;
 312         struct wreplsrv_owner *cur;
 313
 314         if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
 315                 wins_owner = service->wins_db->local_owner;
 316         }
 317
 318         cur = wreplsrv_find_owner(service, table, wins_owner);
 319
 320         /* if it doesn't exists yet, create one */
 321         if (!cur) {
 322                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 323                 NT_STATUS_HAVE_NO_MEMORY(cur);
 324
 325                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 326                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 327                 cur->owner.min_version  = 0;
 328                 cur->owner.max_version  = 0;
 329                 cur->owner.type         = 1; /* don't know why this is always 1 */
 330
 331                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 332
 333                 DLIST_ADD_END(table, cur, struct wreplsrv_owner *);
 334                 *_table = table;
 335         }
 336
 337         /* the min_version is always 0 here, and won't be updated */
 338
 339         /* if the given version is higher than the current max_version, update */
 340         if (cur->owner.max_version < version) {
 341                 cur->owner.max_version = version;
 342                 /* if it's for our local db, we need to update the wins.ldb too */
 343                 if (cur == service->owner) {
 344                         uint64_t ret;
 345                         ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
 346                         if (ret != cur->owner.max_version) {
 347                                 DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
 348                                          (unsigned long long)cur->owner.max_version,
 349                                          (unsigned long long)ret));
 350                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 351                         }
 352                 }
 353         }
 354
 355         return NT_STATUS_OK;
 356 }
 357
 358 /*
 359   load the partner table
 360 */
 361 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 362 {
 363         struct ldb_result *res = NULL;
 364         int ret;
 365         NTSTATUS status;
 366         TALLOC_CTX *tmp_ctx = talloc_new(service);
 367         struct ldb_context *ldb = service->wins_db->ldb;
 368         int i;
 369         struct wreplsrv_owner *local_owner;
 370         const char *wins_owner;
 371         uint64_t version;
 372         const char * const attrs[] = {
 373                 "winsOwner",
 374                 "versionID",
 375                 NULL
 376         };
 377
 378         /*
 379          * make sure we have our local entry in the list,
 380          * but we set service->owner when we're done
 381          * to avoid to many calls to wreplsrv_local_max_version()
 382          */
 383         status = wreplsrv_add_table(service,
 384                                     service, &service->table,
 385                                     service->wins_db->local_owner, 0);
 386         if (!NT_STATUS_IS_OK(status)) goto failed;
 387         local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
 388         if (!local_owner) {
 389                 status = NT_STATUS_INTERNAL_ERROR;
 390                 goto failed;
 391         }
 392
 393         /* find the record in the WINS database */
 394         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE,
 395                          "(objectClass=winsRecord)", attrs, &res);
 396         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 397         if (ret != LDB_SUCCESS) goto failed;
 398         talloc_steal(tmp_ctx, res);
 399
 400         for (i=0; i < res->count; i++) {
 401                 wins_owner     = ldb_msg_find_attr_as_string(res->msgs[i], "winsOwner", NULL);
 402                 version        = ldb_msg_find_attr_as_uint64(res->msgs[i], "versionID", 0);
 403
 404                 status = wreplsrv_add_table(service,
 405                                             service, &service->table,
 406                                             wins_owner, version);
 407                 if (!NT_STATUS_IS_OK(status)) goto failed;
 408                 talloc_free(res->msgs[i]);
 409         }
 410
 411         /*
 412          * this makes sure we call wreplsrv_local_max_version() before returning in
 413          * wreplsrv_find_owner()
 414          */
 415         service->owner = local_owner;
 416
 417         /*
 418          * this makes sure the maxVersion in the database is updated,
 419          * with the highest version we found, if this is higher than the current stored one
 420          */
 421         status = wreplsrv_add_table(service,
 422                                     service, &service->table,
 423                                     service->wins_db->local_owner, local_owner->owner.max_version);
 424         if (!NT_STATUS_IS_OK(status)) goto failed;
 425
 426         talloc_free(tmp_ctx);
 427         return NT_STATUS_OK;
 428 failed:
 429         talloc_free(tmp_ctx);
 430         return status;
 431 }
 432
 433 /*
 434   setup our replication partners
 435 */
 436 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 437 {
 438         NTSTATUS status;
 439
 440         status = wreplsrv_load_partners(service);
 441         NT_STATUS_NOT_OK_RETURN(status);
 442
 443         status = wreplsrv_load_table(service);
 444         NT_STATUS_NOT_OK_RETURN(status);
 445
 446         return NT_STATUS_OK;
 447 }
 448
 449 /*
 450   startup the wrepl task
 451 */
 452 static void wreplsrv_task_init(struct task_server *task)
 453 {
 454         NTSTATUS status;
 455         struct wreplsrv_service *service;
 456
 457         if (!lp_wins_support(task->lp_ctx)) {
 458                 return;
 459         }
 460
 461         task_server_set_title(task, "task[wreplsrv]");
 462
 463         service = talloc_zero(task, struct wreplsrv_service);
 464         if (!service) {
 465                 task_server_terminate(task, "wreplsrv_task_init: out of memory");
 466                 return;
 467         }
 468         service->task           = task;
 469         service->startup_time   = timeval_current();
 470         task->private           = service;
 471
 472         /*
 473          * setup up all partners, and open the winsdb
 474          */
 475         status = wreplsrv_open_winsdb(service, task->lp_ctx);
 476         if (!NT_STATUS_IS_OK(status)) {
 477                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed");
 478                 return;
 479         }
 480
 481         /*
 482          * setup timed events for each partner we want to pull from
 483          */
 484         status = wreplsrv_setup_partners(service);
 485         if (!NT_STATUS_IS_OK(status)) {
 486                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed");
 487                 return;
 488         }
 489
 490         /*
 491          * setup listen sockets, so we can anwser requests from our partners,
 492          * which pull from us
 493          */
 494         status = wreplsrv_setup_sockets(service, task->lp_ctx);
 495         if (!NT_STATUS_IS_OK(status)) {
 496                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
 497                 return;
 498         }
 499
 500         status = wreplsrv_setup_periodic(service);
 501         if (!NT_STATUS_IS_OK(status)) {
 502                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed");
 503                 return;
 504         }
 505
 506         irpc_add_name(task->msg_ctx, "wrepl_server");
 507 }
 508
 509 /*
 510   register ourselves as a available server
 511 */
 512 NTSTATUS server_service_wrepl_init(void)
 513 {
 514         return register_server_service("wrepl", wreplsrv_task_init);
 515 }