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 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 "dlinklist.h"
  25 #include "smbd/service_task.h"
  26 #include "lib/messaging/irpc.h"
  27 #include "librpc/gen_ndr/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
  34 static struct ldb_context *wins_config_db_connect(TALLOC_CTX *mem_ctx)
  35 {
  36         return ldb_wrap_connect(mem_ctx, private_path(mem_ctx, lp_wins_config_url()),
  37                                 system_session(mem_ctx), NULL, 0, NULL);
  38 }
  39
  40 /*
  41   open winsdb
  42 */
  43 static NTSTATUS wreplsrv_open_winsdb(struct wreplsrv_service *service)
  44 {
  45         service->wins_db     = winsdb_connect(service);
  46         if (!service->wins_db) {
  47                 return NT_STATUS_INTERNAL_DB_ERROR;
  48         }
  49
  50         service->config.ldb = wins_config_db_connect(service);
  51         if (!service->config.ldb) {
  52                 return NT_STATUS_INTERNAL_DB_ERROR;
  53         }
  54
  55         /* the default renew interval is 6 days */
  56         service->config.renew_interval    = lp_parm_int(-1,"wreplsrv","renew_interval", 6*24*60*60);
  57
  58         /* the default tombstone (extinction) interval is 6 days */
  59         service->config.tombstone_interval= lp_parm_int(-1,"wreplsrv","tombstone_interval", 6*24*60*60);
  60
  61         /* the default tombstone (extinction) timeout is 1 day */
  62         service->config.tombstone_timeout = lp_parm_int(-1,"wreplsrv","tombstone_timeout", 1*24*60*60);
  63
  64         /* the default tombstone extra timeout is 3 days */
  65         service->config.tombstone_extra_timeout = lp_parm_int(-1,"wreplsrv","tombstone_extra_timeout", 3*24*60*60);
  66
  67         /* the default verify interval is 24 days */
  68         service->config.verify_interval   = lp_parm_int(-1,"wreplsrv","verify_interval", 24*24*60*60);
  69
  70         /* the default scavenging interval is 'renew_interval/2' */
  71         service->config.scavenging_interval=lp_parm_int(-1,"wreplsrv","scavenging_interval",
  72                                                         service->config.renew_interval/2);
  73
  74         /* the maximun interval to the next periodic processing event */
  75         service->config.periodic_interval = lp_parm_int(-1,"wreplsrv","periodic_interval", 60);
  76
  77         return NT_STATUS_OK;
  78 }
  79
  80 struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
  81 {
  82         struct wreplsrv_partner *cur;
  83
  84         for (cur = service->partners; cur; cur = cur->next) {
  85                 if (strcmp(cur->address, peer_addr) == 0) {
  86                         return cur;
  87                 }
  88         }
  89
  90         return NULL;
  91 }
  92
  93 /*
  94   load our replication partners
  95 */
  96 static NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
  97 {
  98         struct ldb_result *res = NULL;
  99         int ret;
 100         TALLOC_CTX *tmp_ctx = talloc_new(service);
 101         int i;
 102
 103         /* find the record in the WINS database */
 104         ret = ldb_search(service->config.ldb, ldb_dn_explode(tmp_ctx, "CN=PARTNERS"), LDB_SCOPE_SUBTREE,
 105                          "(objectClass=wreplPartner)", NULL, &res);
 106         if (ret != LDB_SUCCESS) goto failed;
 107         talloc_steal(tmp_ctx, res);
 108         if (res->count == 0) goto done;
 109
 110         for (i=0; i < res->count; i++) {
 111                 struct wreplsrv_partner *partner;
 112
 113                 partner = talloc_zero(service, struct wreplsrv_partner);
 114                 if (partner == NULL) goto failed;
 115
 116                 partner->service                = service;
 117                 partner->address                = ldb_msg_find_string(res->msgs[i], "address", NULL);
 118                 if (!partner->address) goto failed;
 119                 partner->name                   = ldb_msg_find_string(res->msgs[i], "name", partner->address);
 120                 partner->type                   = ldb_msg_find_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
 121                 partner->pull.interval          = ldb_msg_find_uint(res->msgs[i], "pullInterval",
 122                                                                     WINSREPL_DEFAULT_PULL_INTERVAL);
 123                 partner->pull.retry_interval    = ldb_msg_find_uint(res->msgs[i], "pullRetryInterval",
 124                                                                     WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
 125                 partner->our_address            = ldb_msg_find_string(res->msgs[i], "ourAddress", NULL);
 126                 partner->push.change_count      = ldb_msg_find_uint(res->msgs[i], "pushChangeCount",
 127                                                                     WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
 128                 partner->push.use_inform        = ldb_msg_find_uint(res->msgs[i], "pushUseInform", False);
 129
 130                 talloc_steal(partner, partner->address);
 131                 talloc_steal(partner, partner->name);
 132                 talloc_steal(partner, partner->our_address);
 133
 134                 DLIST_ADD(service->partners, partner);
 135
 136                 DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
 137                         partner->address, partner->type));
 138         }
 139 done:
 140         DEBUG(1,("wreplsrv_load_partners: %u partners found\n", res->count));
 141
 142         talloc_free(tmp_ctx);
 143         return NT_STATUS_OK;
 144 failed:
 145         talloc_free(tmp_ctx);
 146         return NT_STATUS_FOOBAR;
 147 }
 148
 149 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 150                                    TALLOC_CTX *mem_ctx,
 151                                    struct wrepl_table *table_out,
 152                                    const char *initiator,
 153                                    BOOL full_table)
 154 {
 155         struct wreplsrv_owner *cur;
 156         uint32_t i = 0;
 157
 158         table_out->partner_count        = 0;
 159         table_out->partners             = NULL;
 160         table_out->initiator            = initiator;
 161
 162         for (cur = service->table; cur; cur = cur->next) {
 163                 if (full_table) {
 164                         table_out->partner_count++;
 165                         continue;
 166                 }
 167
 168                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 169
 170                 table_out->partner_count++;
 171                 break;
 172         }
 173
 174         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 175         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 176
 177         for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
 178                 if (full_table) {
 179                         table_out->partners[i] = cur->owner;
 180                         i++;
 181                         continue;
 182                 }
 183
 184                 if (strcmp(initiator, cur->owner.address) != 0) continue;
 185
 186                 table_out->partners[i] = cur->owner;
 187                 i++;
 188                 break;
 189         }
 190
 191         return NT_STATUS_OK;
 192 }
 193
 194 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
 195                                            struct wreplsrv_owner *table,
 196                                            const char *wins_owner)
 197 {
 198         struct wreplsrv_owner *cur;
 199
 200         for (cur = table; cur; cur = cur->next) {
 201                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 202                         /*
 203                          * if it's our local entry
 204                          * update the max version
 205                          */
 206                         if (cur == service->owner) {
 207                                 cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
 208                         }
 209                         return cur;
 210                 }
 211         }
 212
 213         return NULL;
 214 }
 215
 216 /*
 217  update the wins_owner_table max_version, if the given version is the highest version
 218  if no entry for the wins_owner exists yet, create one
 219 */
 220 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 221                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 222                             const char *wins_owner, uint64_t version)
 223 {
 224         struct wreplsrv_owner *table = *_table;
 225         struct wreplsrv_owner *cur;
 226
 227         if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
 228                 wins_owner = service->wins_db->local_owner;
 229         }
 230
 231         cur = wreplsrv_find_owner(service, table, wins_owner);
 232
 233         /* if it doesn't exists yet, create one */
 234         if (!cur) {
 235                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 236                 NT_STATUS_HAVE_NO_MEMORY(cur);
 237
 238                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 239                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 240                 cur->owner.min_version  = 0;
 241                 cur->owner.max_version  = 0;
 242                 cur->owner.type         = 1; /* don't know why this is always 1 */
 243
 244                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 245
 246                 DLIST_ADD_END(table, cur, struct wreplsrv_owner *);
 247                 *_table = table;
 248         }
 249
 250         /* the min_version is always 0 here, and won't be updated */
 251
 252         /* if the given version is higher the then current nax_version, update */
 253         if (cur->owner.max_version < version) {
 254                 cur->owner.max_version = version;
 255                 /* if it's for our local db, we need to update the wins.ldb too */
 256                 if (cur == service->owner) {
 257                         uint64_t ret;
 258                         ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
 259                         if (ret != cur->owner.max_version) {
 260                                 DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
 261                                         cur->owner.max_version, ret));
 262                                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 263                         }
 264                 }
 265         }
 266
 267         return NT_STATUS_OK;
 268 }
 269
 270 /*
 271   load the partner table
 272 */
 273 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 274 {
 275         struct ldb_result *res = NULL;
 276         int ret;
 277         NTSTATUS status;
 278         TALLOC_CTX *tmp_ctx = talloc_new(service);
 279         struct ldb_context *ldb = service->wins_db->ldb;
 280         int i;
 281         struct wreplsrv_owner *local_owner;
 282         const char *wins_owner;
 283         uint64_t version;
 284         const char * const attrs[] = {
 285                 "winsOwner",
 286                 "versionID",
 287                 NULL
 288         };
 289
 290         /*
 291          * make sure we have our local entry in the list,
 292          * but we set service->owner when we're done
 293          * to avoid to many calls to wreplsrv_local_max_version()
 294          */
 295         status = wreplsrv_add_table(service,
 296                                     service, &service->table,
 297                                     service->wins_db->local_owner, 0);
 298         if (!NT_STATUS_IS_OK(status)) goto failed;
 299         local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
 300         if (!local_owner) {
 301                 status = NT_STATUS_INTERNAL_ERROR;
 302                 goto failed;
 303         }
 304
 305         /* find the record in the WINS database */
 306         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE,
 307                          "(objectClass=winsRecord)", attrs, &res);
 308         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 309         if (ret != LDB_SUCCESS) goto failed;
 310         talloc_steal(tmp_ctx, res);
 311         if (res->count == 0) goto done;
 312
 313         for (i=0; i < res->count; i++) {
 314                 wins_owner     = ldb_msg_find_string(res->msgs[i], "winsOwner", NULL);
 315                 version        = ldb_msg_find_uint64(res->msgs[i], "versionID", 0);
 316
 317                 status = wreplsrv_add_table(service,
 318                                             service, &service->table,
 319                                             wins_owner, version);
 320                 if (!NT_STATUS_IS_OK(status)) goto failed;
 321                 talloc_free(res->msgs[i]);
 322         }
 323 done:
 324         /*
 325          * this makes sure we call wreplsrv_local_max_version() before returning in
 326          * wreplsrv_find_owner()
 327          */
 328         service->owner = local_owner;
 329
 330         /*
 331          * this makes sure the maxVersion in the database is updated,
 332          * with the highest version we found, if this is higher than the current stored one
 333          */
 334         status = wreplsrv_add_table(service,
 335                                     service, &service->table,
 336                                     service->wins_db->local_owner, local_owner->owner.max_version);
 337         if (!NT_STATUS_IS_OK(status)) goto failed;
 338
 339         talloc_free(tmp_ctx);
 340         return NT_STATUS_OK;
 341 failed:
 342         talloc_free(tmp_ctx);
 343         return status;
 344 }
 345
 346 /*
 347   setup our replication partners
 348 */
 349 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 350 {
 351         NTSTATUS status;
 352
 353         status = wreplsrv_load_partners(service);
 354         NT_STATUS_NOT_OK_RETURN(status);
 355
 356         status = wreplsrv_load_table(service);
 357         NT_STATUS_NOT_OK_RETURN(status);
 358
 359         return NT_STATUS_OK;
 360 }
 361
 362 /*
 363   startup the wrepl task
 364 */
 365 static void wreplsrv_task_init(struct task_server *task)
 366 {
 367         NTSTATUS status;
 368         struct wreplsrv_service *service;
 369
 370         service = talloc_zero(task, struct wreplsrv_service);
 371         if (!service) {
 372                 task_server_terminate(task, "wreplsrv_task_init: out of memory");
 373                 return;
 374         }
 375         service->task           = task;
 376         service->startup_time   = timeval_current();
 377         task->private           = service;
 378
 379         /*
 380          * setup up all partners, and open the winsdb
 381          */
 382         status = wreplsrv_open_winsdb(service);
 383         if (!NT_STATUS_IS_OK(status)) {
 384                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed");
 385                 return;
 386         }
 387
 388         /*
 389          * setup timed events for each partner we want to pull from
 390          */
 391         status = wreplsrv_setup_partners(service);
 392         if (!NT_STATUS_IS_OK(status)) {
 393                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed");
 394                 return;
 395         }
 396
 397         /*
 398          * setup listen sockets, so we can anwser requests from our partners,
 399          * which pull from us
 400          */
 401         status = wreplsrv_setup_sockets(service);
 402         if (!NT_STATUS_IS_OK(status)) {
 403                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
 404                 return;
 405         }
 406
 407         status = wreplsrv_setup_periodic(service);
 408         if (!NT_STATUS_IS_OK(status)) {
 409                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed");
 410                 return;
 411         }
 412
 413         irpc_add_name(task->msg_ctx, "wrepl_server");
 414 }
 415
 416 /*
 417   initialise the WREPL server
 418  */
 419 static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
 420 {
 421         if (!lp_wins_support()) {
 422                 return NT_STATUS_OK;
 423         }
 424
 425         return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
 426 }
 427
 428 /*
 429   register ourselves as a available server
 430 */
 431 NTSTATUS server_service_wrepl_init(void)
 432 {
 433         return register_server_service("wrepl", wreplsrv_init);
 434 }