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 "samba/service_task.h"
  25 #include "samba/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 maximum 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 static uint32_t wreplsrv_find_attr_as_uint32(const struct ldb_message *msg,
 134                                              const char *attr_name,
 135                                              uint32_t default_value)
 136 {
 137         const struct ldb_val *v = ldb_msg_find_ldb_val(msg, attr_name);
 138         char buf[sizeof("-2147483648")] = {};
 139         char *end = NULL;
 140         uint32_t ret;
 141         int base = 10;
 142
 143         if (!v || !v->data) {
 144                 return default_value;
 145         }
 146
 147         if (v->length >= sizeof(buf)) {
 148                 return default_value;
 149         }
 150
 151         memcpy(buf, v->data, v->length);
 152         if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {
 153                 base = 16;
 154         }
 155
 156         errno = 0;
 157         ret = strtoll(buf, &end, base);
 158         if (errno == ERANGE || errno == EINVAL) {
 159                 errno = 0;
 160                 ret = strtoull(buf, &end, base);
 161                 if (errno == ERANGE || errno == EINVAL) {
 162                         return default_value;
 163                 }
 164         }
 165         if (end && end[0] != '\0') {
 166                 return default_value;
 167         }
 168         return ret;
 169 }
 170
 171 /*
 172   load our replication partners
 173 */
 174 NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
 175 {
 176         struct wreplsrv_partner *partner;
 177         struct ldb_result *res = NULL;
 178         int ret;
 179         TALLOC_CTX *tmp_ctx;
 180         unsigned int i;
 181         uint64_t new_seqnumber;
 182
 183         new_seqnumber = wins_config_db_get_seqnumber(service->config.ldb);
 184
 185         /* if it's not the first run and nothing changed we're done */
 186         if (service->config.seqnumber != 0 && service->config.seqnumber == new_seqnumber) {
 187                 return NT_STATUS_OK;
 188         }
 189
 190         tmp_ctx = talloc_new(service);
 191         NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
 192
 193         service->config.seqnumber = new_seqnumber;
 194
 195         /* find the record in the WINS database */
 196         ret = ldb_search(service->config.ldb, tmp_ctx, &res,
 197                          ldb_dn_new(tmp_ctx, service->config.ldb, "CN=PARTNERS"),
 198                          LDB_SCOPE_SUBTREE, NULL, "(objectClass=wreplPartner)");
 199         if (ret != LDB_SUCCESS) goto failed;
 200
 201         /* first disable all existing partners */
 202         for (partner=service->partners; partner; partner = partner->next) {
 203                 partner->type = WINSREPL_PARTNER_NONE;
 204         }
 205
 206         for (i=0; i < res->count; i++) {
 207                 const char *address;
 208
 209                 address = ldb_msg_find_attr_as_string(res->msgs[i], "address", NULL);
 210                 if (!address) {
 211                         goto failed;
 212                 }
 213
 214                 partner = wreplsrv_find_partner(service, address);
 215                 if (partner) {
 216                         if (partner->name != partner->address) {
 217                                 talloc_free(discard_const(partner->name));
 218                         }
 219                         partner->name = NULL;
 220                         talloc_free(discard_const(partner->our_address));
 221                         partner->our_address = NULL;
 222
 223                         /* force rescheduling of pulling */
 224                         partner->pull.next_run = timeval_zero();
 225                 } else {
 226                         partner = talloc_zero(service, struct wreplsrv_partner);
 227                         if (partner == NULL) goto failed;
 228
 229                         partner->service = service;
 230                         partner->address = address;
 231                         talloc_steal(partner, partner->address);
 232
 233                         DLIST_ADD_END(service->partners, partner);
 234                 }
 235
 236                 partner->name                   = ldb_msg_find_attr_as_string(res->msgs[i], "name", partner->address);
 237                 talloc_steal(partner, partner->name);
 238                 partner->our_address            = ldb_msg_find_attr_as_string(res->msgs[i], "ourAddress", NULL);
 239                 talloc_steal(partner, partner->our_address);
 240
 241                 partner->type                   = wreplsrv_find_attr_as_uint32(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
 242                 partner->pull.interval          = ldb_msg_find_attr_as_uint(res->msgs[i], "pullInterval",
 243                                                                     WINSREPL_DEFAULT_PULL_INTERVAL);
 244                 partner->pull.retry_interval    = ldb_msg_find_attr_as_uint(res->msgs[i], "pullRetryInterval",
 245                                                                     WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
 246                 partner->push.change_count      = ldb_msg_find_attr_as_uint(res->msgs[i], "pushChangeCount",
 247                                                                     WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
 248                 partner->push.use_inform        = ldb_msg_find_attr_as_uint(res->msgs[i], "pushUseInform", true);
 249
 250                 DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
 251                         partner->address, partner->type));
 252         }
 253
 254         DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
 255                 res->count, (unsigned long long)service->config.seqnumber));
 256
 257         talloc_free(tmp_ctx);
 258         return NT_STATUS_OK;
 259 failed:
 260         talloc_free(tmp_ctx);
 261         return NT_STATUS_FOOBAR;
 262 }
 263
 264 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 265                                    TALLOC_CTX *mem_ctx,
 266                                    struct wrepl_table *table_out,
 267                                    const char *initiator,
 268                                    bool full_table)
 269 {
 270         struct wreplsrv_owner *cur;
 271         uint32_t i = 0;
 272
 273         table_out->partner_count        = 0;
 274         table_out->partners             = NULL;
 275         table_out->initiator            = initiator;
 276
 277         for (cur = service->table; cur; cur = cur->next) {
 278                 if (full_table) {
 279                         table_out->partner_count++;
 280                         continue;
 281                 }
 282
 283                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 284
 285                 table_out->partner_count++;
 286                 break;
 287         }
 288
 289         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 290         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 291
 292         for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
 293                 /*
 294                  * if it's our local entry
 295                  * update the max version
 296                  */
 297                 if (cur == service->owner) {
 298                         cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 299                 }
 300
 301                 if (full_table) {
 302                         table_out->partners[i] = cur->owner;
 303                         i++;
 304                         continue;
 305                 }
 306
 307                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 308
 309                 table_out->partners[i] = cur->owner;
 310                 i++;
 311                 break;
 312         }
 313
 314         return NT_STATUS_OK;
 315 }
 316
 317 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
 318                                            struct wreplsrv_owner *table,
 319                                            const char *wins_owner)
 320 {
 321         struct wreplsrv_owner *cur;
 322
 323         for (cur = table; cur; cur = cur->next) {
 324                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 325                         /*
 326                          * if it's our local entry
 327                          * update the max version
 328                          */
 329                         if (cur == service->owner) {
 330                                 cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 331                         }
 332                         return cur;
 333                 }
 334         }
 335
 336         return NULL;
 337 }
 338
 339 /*
 340  update the wins_owner_table max_version, if the given version is the highest version
 341  if no entry for the wins_owner exists yet, create one
 342 */
 343 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 344                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 345                             const char *wins_owner, uint64_t version)
 346 {
 347         struct wreplsrv_owner *table = *_table;
 348         struct wreplsrv_owner *cur;
 349
 350         if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
 351                 wins_owner = service->wins_db->local_owner;
 352         }
 353
 354         cur = wreplsrv_find_owner(service, table, wins_owner);
 355
 356         /* if it doesn't exists yet, create one */
 357         if (!cur) {
 358                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 359                 NT_STATUS_HAVE_NO_MEMORY(cur);
 360
 361                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 362                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 363                 cur->owner.min_version  = 0;
 364                 cur->owner.max_version  = 0;
 365                 cur->owner.type         = 1; /* don't know why this is always 1 */
 366
 367                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 368
 369                 DLIST_ADD_END(table, cur);
 370                 *_table = table;
 371         }
 372
 373         /* the min_version is always 0 here, and won't be updated */
 374
 375         /* if the given version is higher than the current max_version, update */
 376         if (cur->owner.max_version < version) {
 377                 cur->owner.max_version = version;
 378                 /* if it's for our local db, we need to update the wins.ldb too */
 379                 if (cur == service->owner) {
 380                         uint64_t ret;
 381                         ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
 382                         if (ret != cur->owner.max_version) {
 383                                 DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
 384                                          (unsigned long long)cur->owner.max_version,
 385                                          (unsigned long long)ret));
 386                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 387                         }
 388                 }
 389         }
 390
 391         return NT_STATUS_OK;
 392 }
 393
 394 /*
 395   load the partner table
 396 */
 397 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 398 {
 399         struct ldb_result *res = NULL;
 400         int ret;
 401         NTSTATUS status;
 402         TALLOC_CTX *tmp_ctx = talloc_new(service);
 403         struct ldb_context *ldb = service->wins_db->ldb;
 404         unsigned int i;
 405         struct wreplsrv_owner *local_owner;
 406         const char *wins_owner;
 407         uint64_t version;
 408         const char * const attrs[] = {
 409                 "winsOwner",
 410                 "versionID",
 411                 NULL
 412         };
 413
 414         /*
 415          * make sure we have our local entry in the list,
 416          * but we set service->owner when we're done
 417          * to avoid to many calls to wreplsrv_local_max_version()
 418          */
 419         status = wreplsrv_add_table(service,
 420                                     service, &service->table,
 421                                     service->wins_db->local_owner, 0);
 422         if (!NT_STATUS_IS_OK(status)) goto failed;
 423         local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
 424         if (!local_owner) {
 425                 status = NT_STATUS_INTERNAL_ERROR;
 426                 goto failed;
 427         }
 428
 429         /* find the record in the WINS database */
 430         ret = ldb_search(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
 431                          attrs, "(objectClass=winsRecord)");
 432         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 433         if (ret != LDB_SUCCESS) goto failed;
 434
 435         for (i=0; i < res->count; i++) {
 436                 wins_owner     = ldb_msg_find_attr_as_string(res->msgs[i], "winsOwner", NULL);
 437                 version        = ldb_msg_find_attr_as_uint64(res->msgs[i], "versionID", 0);
 438
 439                 status = wreplsrv_add_table(service,
 440                                             service, &service->table,
 441                                             wins_owner, version);
 442                 if (!NT_STATUS_IS_OK(status)) goto failed;
 443                 talloc_free(res->msgs[i]);
 444         }
 445
 446         /*
 447          * this makes sure we call wreplsrv_local_max_version() before returning in
 448          * wreplsrv_find_owner()
 449          */
 450         service->owner = local_owner;
 451
 452         /*
 453          * this makes sure the maxVersion in the database is updated,
 454          * with the highest version we found, if this is higher than the current stored one
 455          */
 456         status = wreplsrv_add_table(service,
 457                                     service, &service->table,
 458                                     service->wins_db->local_owner, local_owner->owner.max_version);
 459         if (!NT_STATUS_IS_OK(status)) goto failed;
 460
 461         talloc_free(tmp_ctx);
 462         return NT_STATUS_OK;
 463 failed:
 464         talloc_free(tmp_ctx);
 465         return status;
 466 }
 467
 468 /*
 469   setup our replication partners
 470 */
 471 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 472 {
 473         NTSTATUS status;
 474
 475         status = wreplsrv_load_partners(service);
 476         NT_STATUS_NOT_OK_RETURN(status);
 477
 478         status = wreplsrv_load_table(service);
 479         NT_STATUS_NOT_OK_RETURN(status);
 480
 481         return NT_STATUS_OK;
 482 }
 483
 484 /*
 485   startup the wrepl task
 486 */
 487 static NTSTATUS wreplsrv_task_init(struct task_server *task)
 488 {
 489         NTSTATUS status;
 490         struct wreplsrv_service *service;
 491
 492         if (!lpcfg_we_are_a_wins_server(task->lp_ctx)) {
 493                 return NT_STATUS_INVALID_DOMAIN_ROLE;
 494         }
 495
 496         task_server_set_title(task, "task[wreplsrv]");
 497
 498         service = talloc_zero(task, struct wreplsrv_service);
 499         if (!service) {
 500                 task_server_terminate(task, "wreplsrv_task_init: out of memory", true);
 501                 return NT_STATUS_NO_MEMORY;
 502         }
 503         service->task           = task;
 504         service->startup_time   = timeval_current();
 505         task->private_data      = service;
 506
 507         /*
 508          * setup up all partners, and open the winsdb
 509          */
 510         status = wreplsrv_open_winsdb(service, task->lp_ctx);
 511         if (!NT_STATUS_IS_OK(status)) {
 512                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed", true);
 513                 return status;
 514         }
 515
 516         /*
 517          * setup timed events for each partner we want to pull from
 518          */
 519         status = wreplsrv_setup_partners(service);
 520         if (!NT_STATUS_IS_OK(status)) {
 521                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed", true);
 522                 return status;
 523         }
 524
 525         /*
 526          * setup listen sockets, so we can answer requests from our partners,
 527          * which pull from us
 528          */
 529         status = wreplsrv_setup_sockets(service, task->lp_ctx);
 530         if (!NT_STATUS_IS_OK(status)) {
 531                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed", true);
 532                 return status;
 533         }
 534
 535         status = wreplsrv_setup_periodic(service);
 536         if (!NT_STATUS_IS_OK(status)) {
 537                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed", true);
 538                 return status;
 539         }
 540
 541         irpc_add_name(task->msg_ctx, "wrepl_server");
 542
 543         return NT_STATUS_OK;
 544 }
 545
 546 /*
 547   register ourselves as a available server
 548 */
 549 NTSTATUS server_service_wrepl_init(TALLOC_CTX *ctx)
 550 {
 551         static const struct service_details details = {
 552                 .inhibit_fork_on_accept = true,
 553                 .inhibit_pre_fork = true,
 554                 .task_init = wreplsrv_task_init,
 555                 .post_fork = NULL
 556         };
 557         return register_server_service(ctx, "wrepl", &details);
 558 }