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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "lib/util/dlinklist.h"
  25 #include "smbd/service_task.h"
  26 #include "smbd/service.h"
  27 #include "lib/messaging/irpc.h"
  28 #include "librpc/gen_ndr/winsrepl.h"
  29 #include "wrepl_server/wrepl_server.h"
  30 #include "nbt_server/wins/winsdb.h"
  31 #include "ldb/include/ldb.h"
  32 #include "ldb/include/ldb_errors.h"
  33 #include "auth/auth.h"
  34 #include "db_wrap.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_explode(tmp_ctx, "@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(-1,"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(-1,"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(-1,"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(-1,"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(-1,"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(-1,"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(-1,"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 = talloc_new(service);
 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         service->config.seqnumber = new_seqnumber;
 142
 143         /* find the record in the WINS database */
 144         ret = ldb_search(service->config.ldb, ldb_dn_explode(tmp_ctx, "CN=PARTNERS"), LDB_SCOPE_SUBTREE,
 145                          "(objectClass=wreplPartner)", NULL, &res);
 146         if (ret != LDB_SUCCESS) goto failed;
 147         talloc_steal(tmp_ctx, res);
 148
 149         /* first disable all existing partners */
 150         for (partner=service->partners; partner; partner = partner->next) {
 151                 partner->type = WINSREPL_PARTNER_NONE;
 152         }
 153
 154         for (i=0; i < res->count; i++) {
 155                 const char *address;
 156
 157                 address = ldb_msg_find_attr_as_string(res->msgs[i], "address", NULL);
 158                 if (!address) {
 159                         goto failed;
 160                 }
 161
 162                 partner = wreplsrv_find_partner(service, address);
 163                 if (partner) {
 164                         if (partner->name != partner->address) {
 165                                 talloc_free(discard_const(partner->name));
 166                         }
 167                         partner->name = NULL;
 168                         talloc_free(discard_const(partner->our_address));
 169                         partner->our_address = NULL;
 170
 171                         /* force rescheduling of pulling */
 172                         partner->pull.next_run = timeval_zero();
 173                 } else {
 174                         partner = talloc_zero(service, struct wreplsrv_partner);
 175                         if (partner == NULL) goto failed;
 176
 177                         partner->service = service;
 178                         partner->address = address;
 179                         talloc_steal(partner, partner->address);
 180
 181                         DLIST_ADD_END(service->partners, partner, struct wreplsrv_partner *);
 182                 }
 183
 184                 partner->name                   = ldb_msg_find_attr_as_string(res->msgs[i], "name", partner->address);
 185                 talloc_steal(partner, partner->name);
 186                 partner->our_address            = ldb_msg_find_attr_as_string(res->msgs[i], "ourAddress", NULL);
 187                 talloc_steal(partner, partner->our_address);
 188
 189                 partner->type                   = ldb_msg_find_attr_as_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
 190                 partner->pull.interval          = ldb_msg_find_attr_as_uint(res->msgs[i], "pullInterval",
 191                                                                     WINSREPL_DEFAULT_PULL_INTERVAL);
 192                 partner->pull.retry_interval    = ldb_msg_find_attr_as_uint(res->msgs[i], "pullRetryInterval",
 193                                                                     WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
 194                 partner->push.change_count      = ldb_msg_find_attr_as_uint(res->msgs[i], "pushChangeCount",
 195                                                                     WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
 196                 partner->push.use_inform        = ldb_msg_find_attr_as_uint(res->msgs[i], "pushUseInform", False);
 197
 198                 DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
 199                         partner->address, partner->type));
 200         }
 201
 202         DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
 203                 res->count, service->config.seqnumber));
 204
 205         talloc_free(tmp_ctx);
 206         return NT_STATUS_OK;
 207 failed:
 208         talloc_free(tmp_ctx);
 209         return NT_STATUS_FOOBAR;
 210 }
 211
 212 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 213                                    TALLOC_CTX *mem_ctx,
 214                                    struct wrepl_table *table_out,
 215                                    const char *initiator,
 216                                    BOOL full_table)
 217 {
 218         struct wreplsrv_owner *cur;
 219         uint32_t i = 0;
 220
 221         table_out->partner_count        = 0;
 222         table_out->partners             = NULL;
 223         table_out->initiator            = initiator;
 224
 225         for (cur = service->table; cur; cur = cur->next) {
 226                 if (full_table) {
 227                         table_out->partner_count++;
 228                         continue;
 229                 }
 230
 231                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 232
 233                 table_out->partner_count++;
 234                 break;
 235         }
 236
 237         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 238         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 239
 240         for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
 241                 /*
 242                  * if it's our local entry
 243                  * update the max version
 244                  */
 245                 if (cur == service->owner) {
 246                         cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 247                 }
 248
 249                 if (full_table) {
 250                         table_out->partners[i] = cur->owner;
 251                         i++;
 252                         continue;
 253                 }
 254
 255                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 256
 257                 table_out->partners[i] = cur->owner;
 258                 i++;
 259                 break;
 260         }
 261
 262         return NT_STATUS_OK;
 263 }
 264
 265 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
 266                                            struct wreplsrv_owner *table,
 267                                            const char *wins_owner)
 268 {
 269         struct wreplsrv_owner *cur;
 270
 271         for (cur = table; cur; cur = cur->next) {
 272                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 273                         /*
 274                          * if it's our local entry
 275                          * update the max version
 276                          */
 277                         if (cur == service->owner) {
 278                                 cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 279                         }
 280                         return cur;
 281                 }
 282         }
 283
 284         return NULL;
 285 }
 286
 287 /*
 288  update the wins_owner_table max_version, if the given version is the highest version
 289  if no entry for the wins_owner exists yet, create one
 290 */
 291 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 292                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 293                             const char *wins_owner, uint64_t version)
 294 {
 295         struct wreplsrv_owner *table = *_table;
 296         struct wreplsrv_owner *cur;
 297
 298         if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
 299                 wins_owner = service->wins_db->local_owner;
 300         }
 301
 302         cur = wreplsrv_find_owner(service, table, wins_owner);
 303
 304         /* if it doesn't exists yet, create one */
 305         if (!cur) {
 306                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 307                 NT_STATUS_HAVE_NO_MEMORY(cur);
 308
 309                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 310                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 311                 cur->owner.min_version  = 0;
 312                 cur->owner.max_version  = 0;
 313                 cur->owner.type         = 1; /* don't know why this is always 1 */
 314
 315                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 316
 317                 DLIST_ADD_END(table, cur, struct wreplsrv_owner *);
 318                 *_table = table;
 319         }
 320
 321         /* the min_version is always 0 here, and won't be updated */
 322
 323         /* if the given version is higher than the current max_version, update */
 324         if (cur->owner.max_version < version) {
 325                 cur->owner.max_version = version;
 326                 /* if it's for our local db, we need to update the wins.ldb too */
 327                 if (cur == service->owner) {
 328                         uint64_t ret;
 329                         ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
 330                         if (ret != cur->owner.max_version) {
 331                                 DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
 332                                         cur->owner.max_version, ret));
 333                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 334                         }
 335                 }
 336         }
 337
 338         return NT_STATUS_OK;
 339 }
 340
 341 /*
 342   load the partner table
 343 */
 344 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 345 {
 346         struct ldb_result *res = NULL;
 347         int ret;
 348         NTSTATUS status;
 349         TALLOC_CTX *tmp_ctx = talloc_new(service);
 350         struct ldb_context *ldb = service->wins_db->ldb;
 351         int i;
 352         struct wreplsrv_owner *local_owner;
 353         const char *wins_owner;
 354         uint64_t version;
 355         const char * const attrs[] = {
 356                 "winsOwner",
 357                 "versionID",
 358                 NULL
 359         };
 360
 361         /*
 362          * make sure we have our local entry in the list,
 363          * but we set service->owner when we're done
 364          * to avoid to many calls to wreplsrv_local_max_version()
 365          */
 366         status = wreplsrv_add_table(service,
 367                                     service, &service->table,
 368                                     service->wins_db->local_owner, 0);
 369         if (!NT_STATUS_IS_OK(status)) goto failed;
 370         local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
 371         if (!local_owner) {
 372                 status = NT_STATUS_INTERNAL_ERROR;
 373                 goto failed;
 374         }
 375
 376         /* find the record in the WINS database */
 377         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE,
 378                          "(objectClass=winsRecord)", attrs, &res);
 379         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 380         if (ret != LDB_SUCCESS) goto failed;
 381         talloc_steal(tmp_ctx, res);
 382
 383         for (i=0; i < res->count; i++) {
 384                 wins_owner     = ldb_msg_find_attr_as_string(res->msgs[i], "winsOwner", NULL);
 385                 version        = ldb_msg_find_attr_as_uint64(res->msgs[i], "versionID", 0);
 386
 387                 status = wreplsrv_add_table(service,
 388                                             service, &service->table,
 389                                             wins_owner, version);
 390                 if (!NT_STATUS_IS_OK(status)) goto failed;
 391                 talloc_free(res->msgs[i]);
 392         }
 393
 394         /*
 395          * this makes sure we call wreplsrv_local_max_version() before returning in
 396          * wreplsrv_find_owner()
 397          */
 398         service->owner = local_owner;
 399
 400         /*
 401          * this makes sure the maxVersion in the database is updated,
 402          * with the highest version we found, if this is higher than the current stored one
 403          */
 404         status = wreplsrv_add_table(service,
 405                                     service, &service->table,
 406                                     service->wins_db->local_owner, local_owner->owner.max_version);
 407         if (!NT_STATUS_IS_OK(status)) goto failed;
 408
 409         talloc_free(tmp_ctx);
 410         return NT_STATUS_OK;
 411 failed:
 412         talloc_free(tmp_ctx);
 413         return status;
 414 }
 415
 416 /*
 417   setup our replication partners
 418 */
 419 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 420 {
 421         NTSTATUS status;
 422
 423         status = wreplsrv_load_partners(service);
 424         NT_STATUS_NOT_OK_RETURN(status);
 425
 426         status = wreplsrv_load_table(service);
 427         NT_STATUS_NOT_OK_RETURN(status);
 428
 429         return NT_STATUS_OK;
 430 }
 431
 432 /*
 433   startup the wrepl task
 434 */
 435 static void wreplsrv_task_init(struct task_server *task)
 436 {
 437         NTSTATUS status;
 438         struct wreplsrv_service *service;
 439
 440         task_server_set_title(task, "task[wreplsrv]");
 441
 442         service = talloc_zero(task, struct wreplsrv_service);
 443         if (!service) {
 444                 task_server_terminate(task, "wreplsrv_task_init: out of memory");
 445                 return;
 446         }
 447         service->task           = task;
 448         service->startup_time   = timeval_current();
 449         task->private           = service;
 450
 451         /*
 452          * setup up all partners, and open the winsdb
 453          */
 454         status = wreplsrv_open_winsdb(service);
 455         if (!NT_STATUS_IS_OK(status)) {
 456                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed");
 457                 return;
 458         }
 459
 460         /*
 461          * setup timed events for each partner we want to pull from
 462          */
 463         status = wreplsrv_setup_partners(service);
 464         if (!NT_STATUS_IS_OK(status)) {
 465                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed");
 466                 return;
 467         }
 468
 469         /*
 470          * setup listen sockets, so we can anwser requests from our partners,
 471          * which pull from us
 472          */
 473         status = wreplsrv_setup_sockets(service);
 474         if (!NT_STATUS_IS_OK(status)) {
 475                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
 476                 return;
 477         }
 478
 479         status = wreplsrv_setup_periodic(service);
 480         if (!NT_STATUS_IS_OK(status)) {
 481                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed");
 482                 return;
 483         }
 484
 485         irpc_add_name(task->msg_ctx, "wrepl_server");
 486 }
 487
 488 /*
 489   initialise the WREPL server
 490  */
 491 static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
 492 {
 493         if (!lp_wins_support()) {
 494                 return NT_STATUS_OK;
 495         }
 496
 497         return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
 498 }
 499
 500 /*
 501   register ourselves as a available server
 502 */
 503 NTSTATUS server_service_wrepl_init(void)
 504 {
 505         return register_server_service("wrepl", wreplsrv_init);
 506 }