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