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 "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 BOOL wreplsrv_is_our_address(struct wreplsrv_service *service, const char *address)
 150 {
 151         const char *our_address;
 152
 153         if (lp_interfaces() && lp_bind_interfaces_only()) {
 154                 int num_interfaces = iface_count();
 155                 int i;
 156                 for(i = 0; i < num_interfaces; i++) {
 157                         our_address = iface_n_ip(i);
 158                         if (strcasecmp(our_address, address) == 0) {
 159                                 return True;
 160                         }
 161                 }
 162         } else {
 163                 our_address = lp_socket_address();
 164                 if (strcasecmp(our_address, address) == 0) {
 165                         return True;
 166                 }
 167         }
 168
 169         return False;
 170 }
 171
 172 uint64_t wreplsrv_local_max_version(struct wreplsrv_service *service)
 173 {
 174         int ret;
 175         struct ldb_context *ldb = service->wins_db->ldb;
 176         struct ldb_dn *dn;
 177         struct ldb_result *res = NULL;
 178         TALLOC_CTX *tmp_ctx = talloc_new(service);
 179         uint64_t maxVersion = 0;
 180
 181         dn = ldb_dn_explode(tmp_ctx, "CN=VERSION");
 182         if (!dn) goto failed;
 183
 184         /* find the record in the WINS database */
 185         ret = ldb_search(ldb, dn, LDB_SCOPE_BASE,
 186                          NULL, NULL, &res);
 187         if (ret != LDB_SUCCESS) goto failed;
 188         talloc_steal(tmp_ctx, res);
 189         if (res->count > 1) goto failed;
 190
 191         if (res->count == 1) {
 192                 maxVersion = ldb_msg_find_uint64(res->msgs[0], "maxVersion", 0);
 193         }
 194
 195 failed:
 196         talloc_free(tmp_ctx);
 197         return maxVersion;
 198 }
 199
 200 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 201                                    TALLOC_CTX *mem_ctx,
 202                                    struct wrepl_table *table_out,
 203                                    const char *our_ip,
 204                                    const char *initiator,
 205                                    BOOL full_table)
 206 {
 207         struct wreplsrv_owner *cur;
 208         uint64_t local_max_version;
 209         uint32_t i = 0;
 210
 211         table_out->partner_count        = 0;
 212         table_out->partners             = NULL;
 213         table_out->initiator            = initiator;
 214
 215         local_max_version = wreplsrv_local_max_version(service);
 216         if (local_max_version > 0) {
 217                 table_out->partner_count++;
 218         }
 219
 220         for (cur = service->table; full_table && cur; cur = cur->next) {
 221                 table_out->partner_count++;
 222         }
 223
 224         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 225         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 226
 227         if (local_max_version > 0) {
 228                 table_out->partners[i].address          = our_ip;
 229                 table_out->partners[i].min_version      = 0;
 230                 table_out->partners[i].max_version      = local_max_version;
 231                 table_out->partners[i].type             = 1;
 232                 i++;
 233         }
 234
 235         for (cur = service->table; full_table && cur; cur = cur->next) {
 236                 table_out->partners[i] = cur->owner;
 237                 i++;
 238         }
 239
 240         return NT_STATUS_OK;
 241 }
 242
 243 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_owner *table, const char *wins_owner)
 244 {
 245         struct wreplsrv_owner *cur;
 246
 247         for (cur = table; cur; cur = cur->next) {
 248                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 249                         return cur;
 250                 }
 251         }
 252
 253         return NULL;
 254 }
 255
 256 /*
 257  update the wins_owner_table max_version, if the given version is the highest version
 258  if no entry for the wins_owner exists yet, create one
 259 */
 260 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 261                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 262                             const char *wins_owner, uint64_t version)
 263 {
 264         struct wreplsrv_owner *table = *_table;
 265         struct wreplsrv_owner *cur;
 266
 267         if (strcmp(WINSDB_OWNER_LOCAL, wins_owner) == 0) {
 268                 return NT_STATUS_OK;
 269         }
 270
 271         cur = wreplsrv_find_owner(table, wins_owner);
 272
 273         /* if it doesn't exists yet, create one */
 274         if (!cur) {
 275                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 276                 NT_STATUS_HAVE_NO_MEMORY(cur);
 277
 278                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 279                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 280                 cur->owner.min_version  = 0;
 281                 cur->owner.max_version  = 0;
 282                 cur->owner.type         = 1; /* don't know why this is always 1 */
 283
 284                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 285
 286                 DLIST_ADD(table, cur);
 287                 *_table = table;
 288         }
 289
 290         /* the min_version is always 0 here, and won't be updated */
 291
 292         /* if the given version is higher the then current nax_version, update */
 293         if (cur->owner.max_version < version) {
 294                 cur->owner.max_version = version;
 295         }
 296
 297         return NT_STATUS_OK;
 298 }
 299
 300 /*
 301   load the partner table
 302 */
 303 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 304 {
 305         struct ldb_result *res = NULL;
 306         int ret;
 307         NTSTATUS status;
 308         TALLOC_CTX *tmp_ctx = talloc_new(service);
 309         struct ldb_context *ldb = service->wins_db->ldb;
 310         int i;
 311         const char *wins_owner;
 312         uint64_t version;
 313         const char * const attrs[] = {
 314                 "winsOwner",
 315                 "versionID",
 316                 NULL
 317         };
 318
 319         /* find the record in the WINS database */
 320         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE,
 321                          "(objectClass=winsRecord)", attrs, &res);
 322         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 323         if (ret != LDB_SUCCESS) goto failed;
 324         talloc_steal(tmp_ctx, res);
 325         if (res->count == 0) goto done;
 326
 327         for (i=0; i < res->count; i++) {
 328                 wins_owner     = ldb_msg_find_string(res->msgs[i], "winsOwner", NULL);
 329                 version        = ldb_msg_find_uint64(res->msgs[i], "versionID", 0);
 330
 331                 if (wins_owner) {
 332                         status = wreplsrv_add_table(service,
 333                                                     service, &service->table,
 334                                                     wins_owner, version);
 335                         if (!NT_STATUS_IS_OK(status)) goto failed;
 336                 }
 337                 talloc_free(res->msgs[i]);
 338
 339                 /* TODO: what's abut the per address owners? */
 340         }
 341 done:
 342         talloc_free(tmp_ctx);
 343         return NT_STATUS_OK;
 344 failed:
 345         talloc_free(tmp_ctx);
 346         return status;
 347 }
 348
 349 /*
 350   setup our replication partners
 351 */
 352 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 353 {
 354         NTSTATUS status;
 355
 356         status = wreplsrv_load_partners(service);
 357         NT_STATUS_NOT_OK_RETURN(status);
 358
 359         status = wreplsrv_load_table(service);
 360         NT_STATUS_NOT_OK_RETURN(status);
 361
 362         return NT_STATUS_OK;
 363 }
 364
 365 /*
 366   startup the wrepl task
 367 */
 368 static void wreplsrv_task_init(struct task_server *task)
 369 {
 370         NTSTATUS status;
 371         struct wreplsrv_service *service;
 372
 373         service = talloc_zero(task, struct wreplsrv_service);
 374         if (!service) {
 375                 task_server_terminate(task, "wreplsrv_task_init: out of memory");
 376                 return;
 377         }
 378         service->task           = task;
 379         service->startup_time   = timeval_current();
 380         task->private           = service;
 381
 382         /*
 383          * setup up all partners, and open the winsdb
 384          */
 385         status = wreplsrv_open_winsdb(service);
 386         if (!NT_STATUS_IS_OK(status)) {
 387                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed");
 388                 return;
 389         }
 390
 391         /*
 392          * setup timed events for each partner we want to pull from
 393          */
 394         status = wreplsrv_setup_partners(service);
 395         if (!NT_STATUS_IS_OK(status)) {
 396                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed");
 397                 return;
 398         }
 399
 400         /*
 401          * setup listen sockets, so we can anwser requests from our partners,
 402          * which pull from us
 403          */
 404         status = wreplsrv_setup_sockets(service);
 405         if (!NT_STATUS_IS_OK(status)) {
 406                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
 407                 return;
 408         }
 409
 410         status = wreplsrv_setup_periodic(service);
 411         if (!NT_STATUS_IS_OK(status)) {
 412                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed");
 413                 return;
 414         }
 415
 416         irpc_add_name(task->msg_ctx, "wrepl_server");
 417 }
 418
 419 /*
 420   initialise the WREPL server
 421  */
 422 static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
 423 {
 424         if (!lp_wins_support()) {
 425                 return NT_STATUS_OK;
 426         }
 427
 428         return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
 429 }
 430
 431 /*
 432   register ourselves as a available server
 433 */
 434 NTSTATUS server_service_wrepl_init(void)
 435 {
 436         return register_server_service("wrepl", wreplsrv_init);
 437 }