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