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