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.h>
  31 #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 tevent_context *ev_ctx,
  39                                                   struct loadparm_context *lp_ctx)
  40 {
  41         return ldb_wrap_connect(mem_ctx, ev_ctx, lp_ctx, lpcfg_private_path(mem_ctx,
  42                                 lp_ctx, "wins_config.ldb"),
  43                                 system_session(lp_ctx), NULL, 0);
  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, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
  59         if (ret != LDB_SUCCESS) goto failed;
  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         const char *owner = lpcfg_parm_string(lp_ctx, NULL, "winsdb", "local_owner");
  78
  79         if (owner == NULL) {
  80                 struct interface *ifaces;
  81                 load_interface_list(service, lp_ctx, &ifaces);
  82                 owner = iface_list_first_v4(ifaces);
  83         }
  84
  85         service->wins_db     = winsdb_connect(service, service->task->event_ctx, lp_ctx, owner, WINSDB_HANDLE_CALLER_WREPL);
  86         if (!service->wins_db) {
  87                 return NT_STATUS_INTERNAL_DB_ERROR;
  88         }
  89
  90         service->config.ldb = wins_config_db_connect(service, service->task->event_ctx, lp_ctx);
  91         if (!service->config.ldb) {
  92                 return NT_STATUS_INTERNAL_DB_ERROR;
  93         }
  94
  95         /* the default renew interval is 6 days */
  96         service->config.renew_interval    = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","renew_interval", 6*24*60*60);
  97
  98         /* the default tombstone (extinction) interval is 6 days */
  99         service->config.tombstone_interval= lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_interval", 6*24*60*60);
 100
 101         /* the default tombstone (extinction) timeout is 1 day */
 102         service->config.tombstone_timeout = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_timeout", 1*24*60*60);
 103
 104         /* the default tombstone extra timeout is 3 days */
 105         service->config.tombstone_extra_timeout = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_extra_timeout", 3*24*60*60);
 106
 107         /* the default verify interval is 24 days */
 108         service->config.verify_interval   = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","verify_interval", 24*24*60*60);
 109
 110         /* the default scavenging interval is 'renew_interval/2' */
 111         service->config.scavenging_interval=lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","scavenging_interval",
 112                                                         service->config.renew_interval/2);
 113
 114         /* the maximun interval to the next periodic processing event */
 115         service->config.periodic_interval = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","periodic_interval", 15);
 116
 117         return NT_STATUS_OK;
 118 }
 119
 120 struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
 121 {
 122         struct wreplsrv_partner *cur;
 123
 124         for (cur = service->partners; cur; cur = cur->next) {
 125                 if (strcmp(cur->address, peer_addr) == 0) {
 126                         return cur;
 127                 }
 128         }
 129
 130         return NULL;
 131 }
 132
 133 /*
 134   load our replication partners
 135 */
 136 NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
 137 {
 138         struct wreplsrv_partner *partner;
 139         struct ldb_result *res = NULL;
 140         int ret;
 141         TALLOC_CTX *tmp_ctx;
 142         unsigned int i;
 143         uint64_t new_seqnumber;
 144
 145         new_seqnumber = wins_config_db_get_seqnumber(service->config.ldb);
 146
 147         /* if it's not the first run and nothing changed we're done */
 148         if (service->config.seqnumber != 0 && service->config.seqnumber == new_seqnumber) {
 149                 return NT_STATUS_OK;
 150         }
 151
 152         tmp_ctx = talloc_new(service);
 153         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
 154
 155         service->config.seqnumber = new_seqnumber;
 156
 157         /* find the record in the WINS database */
 158         ret = ldb_search(service->config.ldb, tmp_ctx, &res,
 159                          ldb_dn_new(tmp_ctx, service->config.ldb, "CN=PARTNERS"),
 160                          LDB_SCOPE_SUBTREE, NULL, "(objectClass=wreplPartner)");
 161         if (ret != LDB_SUCCESS) goto failed;
 162
 163         /* first disable all existing partners */
 164         for (partner=service->partners; partner; partner = partner->next) {
 165                 partner->type = WINSREPL_PARTNER_NONE;
 166         }
 167
 168         for (i=0; i < res->count; i++) {
 169                 const char *address;
 170
 171                 address = ldb_msg_find_attr_as_string(res->msgs[i], "address", NULL);
 172                 if (!address) {
 173                         goto failed;
 174                 }
 175
 176                 partner = wreplsrv_find_partner(service, address);
 177                 if (partner) {
 178                         if (partner->name != partner->address) {
 179                                 talloc_free(discard_const(partner->name));
 180                         }
 181                         partner->name = NULL;
 182                         talloc_free(discard_const(partner->our_address));
 183                         partner->our_address = NULL;
 184
 185                         /* force rescheduling of pulling */
 186                         partner->pull.next_run = timeval_zero();
 187                 } else {
 188                         partner = talloc_zero(service, struct wreplsrv_partner);
 189                         if (partner == NULL) goto failed;
 190
 191                         partner->service = service;
 192                         partner->address = address;
 193                         talloc_steal(partner, partner->address);
 194
 195                         DLIST_ADD_END(service->partners, partner, struct wreplsrv_partner *);
 196                 }
 197
 198                 partner->name                   = ldb_msg_find_attr_as_string(res->msgs[i], "name", partner->address);
 199                 talloc_steal(partner, partner->name);
 200                 partner->our_address            = ldb_msg_find_attr_as_string(res->msgs[i], "ourAddress", NULL);
 201                 talloc_steal(partner, partner->our_address);
 202
 203                 partner->type                   = ldb_msg_find_attr_as_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
 204                 partner->pull.interval          = ldb_msg_find_attr_as_uint(res->msgs[i], "pullInterval",
 205                                                                     WINSREPL_DEFAULT_PULL_INTERVAL);
 206                 partner->pull.retry_interval    = ldb_msg_find_attr_as_uint(res->msgs[i], "pullRetryInterval",
 207                                                                     WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
 208                 partner->push.change_count      = ldb_msg_find_attr_as_uint(res->msgs[i], "pushChangeCount",
 209                                                                     WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
 210                 partner->push.use_inform        = ldb_msg_find_attr_as_uint(res->msgs[i], "pushUseInform", true);
 211
 212                 DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
 213                         partner->address, partner->type));
 214         }
 215
 216         DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
 217                 res->count, (unsigned long long)service->config.seqnumber));
 218
 219         talloc_free(tmp_ctx);
 220         return NT_STATUS_OK;
 221 failed:
 222         talloc_free(tmp_ctx);
 223         return NT_STATUS_FOOBAR;
 224 }
 225
 226 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 227                                    TALLOC_CTX *mem_ctx,
 228                                    struct wrepl_table *table_out,
 229                                    const char *initiator,
 230                                    bool full_table)
 231 {
 232         struct wreplsrv_owner *cur;
 233         uint32_t i = 0;
 234
 235         table_out->partner_count        = 0;
 236         table_out->partners             = NULL;
 237         table_out->initiator            = initiator;
 238
 239         for (cur = service->table; cur; cur = cur->next) {
 240                 if (full_table) {
 241                         table_out->partner_count++;
 242                         continue;
 243                 }
 244
 245                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 246
 247                 table_out->partner_count++;
 248                 break;
 249         }
 250
 251         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 252         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 253
 254         for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
 255                 /*
 256                  * if it's our local entry
 257                  * update the max version
 258                  */
 259                 if (cur == service->owner) {
 260                         cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 261                 }
 262
 263                 if (full_table) {
 264                         table_out->partners[i] = cur->owner;
 265                         i++;
 266                         continue;
 267                 }
 268
 269                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 270
 271                 table_out->partners[i] = cur->owner;
 272                 i++;
 273                 break;
 274         }
 275
 276         return NT_STATUS_OK;
 277 }
 278
 279 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
 280                                            struct wreplsrv_owner *table,
 281                                            const char *wins_owner)
 282 {
 283         struct wreplsrv_owner *cur;
 284
 285         for (cur = table; cur; cur = cur->next) {
 286                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 287                         /*
 288                          * if it's our local entry
 289                          * update the max version
 290                          */
 291                         if (cur == service->owner) {
 292                                 cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 293                         }
 294                         return cur;
 295                 }
 296         }
 297
 298         return NULL;
 299 }
 300
 301 /*
 302  update the wins_owner_table max_version, if the given version is the highest version
 303  if no entry for the wins_owner exists yet, create one
 304 */
 305 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 306                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 307                             const char *wins_owner, uint64_t version)
 308 {
 309         struct wreplsrv_owner *table = *_table;
 310         struct wreplsrv_owner *cur;
 311
 312         if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
 313                 wins_owner = service->wins_db->local_owner;
 314         }
 315
 316         cur = wreplsrv_find_owner(service, table, wins_owner);
 317
 318         /* if it doesn't exists yet, create one */
 319         if (!cur) {
 320                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 321                 NT_STATUS_HAVE_NO_MEMORY(cur);
 322
 323                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 324                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 325                 cur->owner.min_version  = 0;
 326                 cur->owner.max_version  = 0;
 327                 cur->owner.type         = 1; /* don't know why this is always 1 */
 328
 329                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 330
 331                 DLIST_ADD_END(table, cur, struct wreplsrv_owner *);
 332                 *_table = table;
 333         }
 334
 335         /* the min_version is always 0 here, and won't be updated */
 336
 337         /* if the given version is higher than the current max_version, update */
 338         if (cur->owner.max_version < version) {
 339                 cur->owner.max_version = version;
 340                 /* if it's for our local db, we need to update the wins.ldb too */
 341                 if (cur == service->owner) {
 342                         uint64_t ret;
 343                         ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
 344                         if (ret != cur->owner.max_version) {
 345                                 DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
 346                                          (unsigned long long)cur->owner.max_version,
 347                                          (unsigned long long)ret));
 348                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 349                         }
 350                 }
 351         }
 352
 353         return NT_STATUS_OK;
 354 }
 355
 356 /*
 357   load the partner table
 358 */
 359 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 360 {
 361         struct ldb_result *res = NULL;
 362         int ret;
 363         NTSTATUS status;
 364         TALLOC_CTX *tmp_ctx = talloc_new(service);
 365         struct ldb_context *ldb = service->wins_db->ldb;
 366         unsigned int i;
 367         struct wreplsrv_owner *local_owner;
 368         const char *wins_owner;
 369         uint64_t version;
 370         const char * const attrs[] = {
 371                 "winsOwner",
 372                 "versionID",
 373                 NULL
 374         };
 375
 376         /*
 377          * make sure we have our local entry in the list,
 378          * but we set service->owner when we're done
 379          * to avoid to many calls to wreplsrv_local_max_version()
 380          */
 381         status = wreplsrv_add_table(service,
 382                                     service, &service->table,
 383                                     service->wins_db->local_owner, 0);
 384         if (!NT_STATUS_IS_OK(status)) goto failed;
 385         local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
 386         if (!local_owner) {
 387                 status = NT_STATUS_INTERNAL_ERROR;
 388                 goto failed;
 389         }
 390
 391         /* find the record in the WINS database */
 392         ret = ldb_search(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
 393                          attrs, "(objectClass=winsRecord)");
 394         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 395         if (ret != LDB_SUCCESS) goto failed;
 396
 397         for (i=0; i < res->count; i++) {
 398                 wins_owner     = ldb_msg_find_attr_as_string(res->msgs[i], "winsOwner", NULL);
 399                 version        = ldb_msg_find_attr_as_uint64(res->msgs[i], "versionID", 0);
 400
 401                 status = wreplsrv_add_table(service,
 402                                             service, &service->table,
 403                                             wins_owner, version);
 404                 if (!NT_STATUS_IS_OK(status)) goto failed;
 405                 talloc_free(res->msgs[i]);
 406         }
 407
 408         /*
 409          * this makes sure we call wreplsrv_local_max_version() before returning in
 410          * wreplsrv_find_owner()
 411          */
 412         service->owner = local_owner;
 413
 414         /*
 415          * this makes sure the maxVersion in the database is updated,
 416          * with the highest version we found, if this is higher than the current stored one
 417          */
 418         status = wreplsrv_add_table(service,
 419                                     service, &service->table,
 420                                     service->wins_db->local_owner, local_owner->owner.max_version);
 421         if (!NT_STATUS_IS_OK(status)) goto failed;
 422
 423         talloc_free(tmp_ctx);
 424         return NT_STATUS_OK;
 425 failed:
 426         talloc_free(tmp_ctx);
 427         return status;
 428 }
 429
 430 /*
 431   setup our replication partners
 432 */
 433 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 434 {
 435         NTSTATUS status;
 436
 437         status = wreplsrv_load_partners(service);
 438         NT_STATUS_NOT_OK_RETURN(status);
 439
 440         status = wreplsrv_load_table(service);
 441         NT_STATUS_NOT_OK_RETURN(status);
 442
 443         return NT_STATUS_OK;
 444 }
 445
 446 /*
 447   startup the wrepl task
 448 */
 449 static void wreplsrv_task_init(struct task_server *task)
 450 {
 451         NTSTATUS status;
 452         struct wreplsrv_service *service;
 453
 454         if (!lpcfg_we_are_a_wins_server(task->lp_ctx)) {
 455                 return;
 456         }
 457
 458         task_server_set_title(task, "task[wreplsrv]");
 459
 460         service = talloc_zero(task, struct wreplsrv_service);
 461         if (!service) {
 462                 task_server_terminate(task, "wreplsrv_task_init: out of memory", true);
 463                 return;
 464         }
 465         service->task           = task;
 466         service->startup_time   = timeval_current();
 467         task->private_data      = service;
 468
 469         /*
 470          * setup up all partners, and open the winsdb
 471          */
 472         status = wreplsrv_open_winsdb(service, task->lp_ctx);
 473         if (!NT_STATUS_IS_OK(status)) {
 474                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed", true);
 475                 return;
 476         }
 477
 478         /*
 479          * setup timed events for each partner we want to pull from
 480          */
 481         status = wreplsrv_setup_partners(service);
 482         if (!NT_STATUS_IS_OK(status)) {
 483                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed", true);
 484                 return;
 485         }
 486
 487         /*
 488          * setup listen sockets, so we can answer requests from our partners,
 489          * which pull from us
 490          */
 491         status = wreplsrv_setup_sockets(service, task->lp_ctx);
 492         if (!NT_STATUS_IS_OK(status)) {
 493                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed", true);
 494                 return;
 495         }
 496
 497         status = wreplsrv_setup_periodic(service);
 498         if (!NT_STATUS_IS_OK(status)) {
 499                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed", true);
 500                 return;
 501         }
 502
 503         irpc_add_name(task->msg_ctx, "wrepl_server");
 504 }
 505
 506 /*
 507   register ourselves as a available server
 508 */
 509 NTSTATUS server_service_wrepl_init(void)
 510 {
 511         return register_server_service("wrepl", wreplsrv_task_init);
 512 }