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