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 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         return winsdb_get_maxVersion(service->wins_db);
 175 }
 176
 177 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 178                                    TALLOC_CTX *mem_ctx,
 179                                    struct wrepl_table *table_out,
 180                                    const char *our_ip,
 181                                    const char *initiator,
 182                                    BOOL full_table)
 183 {
 184         struct wreplsrv_owner *cur;
 185         uint64_t local_max_version;
 186         uint32_t i = 0;
 187
 188         table_out->partner_count        = 0;
 189         table_out->partners             = NULL;
 190         table_out->initiator            = initiator;
 191
 192         local_max_version = wreplsrv_local_max_version(service);
 193         if (local_max_version > 0) {
 194                 table_out->partner_count++;
 195         }
 196
 197         for (cur = service->table; full_table && cur; cur = cur->next) {
 198                 table_out->partner_count++;
 199         }
 200
 201         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 202         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 203
 204         if (local_max_version > 0) {
 205                 table_out->partners[i].address          = our_ip;
 206                 table_out->partners[i].min_version      = 0;
 207                 table_out->partners[i].max_version      = local_max_version;
 208                 table_out->partners[i].type             = 1;
 209                 i++;
 210         }
 211
 212         for (cur = service->table; full_table && cur; cur = cur->next) {
 213                 table_out->partners[i] = cur->owner;
 214                 i++;
 215         }
 216
 217         return NT_STATUS_OK;
 218 }
 219
 220 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_owner *table, const char *wins_owner)
 221 {
 222         struct wreplsrv_owner *cur;
 223
 224         for (cur = table; cur; cur = cur->next) {
 225                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 226                         return cur;
 227                 }
 228         }
 229
 230         return NULL;
 231 }
 232
 233 /*
 234  update the wins_owner_table max_version, if the given version is the highest version
 235  if no entry for the wins_owner exists yet, create one
 236 */
 237 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 238                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 239                             const char *wins_owner, uint64_t version)
 240 {
 241         struct wreplsrv_owner *table = *_table;
 242         struct wreplsrv_owner *cur;
 243
 244         if (strcmp(service->wins_db->local_owner, wins_owner) == 0 ||
 245             strcmp("0.0.0.0", 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         struct ldb_context *ldb = service->wins_db->ldb;
 288         int i;
 289         const char *wins_owner;
 290         uint64_t version;
 291         const char * const attrs[] = {
 292                 "winsOwner",
 293                 "versionID",
 294                 NULL
 295         };
 296
 297         /* find the record in the WINS database */
 298         ret = ldb_search(ldb, NULL, LDB_SCOPE_SUBTREE,
 299                          "(objectClass=winsRecord)", attrs, &res);
 300         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 301         if (ret != LDB_SUCCESS) goto failed;
 302         talloc_steal(tmp_ctx, res);
 303         if (res->count == 0) goto done;
 304
 305         for (i=0; i < res->count; i++) {
 306                 wins_owner     = ldb_msg_find_string(res->msgs[i], "winsOwner", NULL);
 307                 version        = ldb_msg_find_uint64(res->msgs[i], "versionID", 0);
 308
 309                 if (wins_owner) {
 310                         status = wreplsrv_add_table(service,
 311                                                     service, &service->table,
 312                                                     wins_owner, version);
 313                         if (!NT_STATUS_IS_OK(status)) goto failed;
 314                 }
 315                 talloc_free(res->msgs[i]);
 316
 317                 /* TODO: what's abut the per address owners? */
 318         }
 319 done:
 320         talloc_free(tmp_ctx);
 321         return NT_STATUS_OK;
 322 failed:
 323         talloc_free(tmp_ctx);
 324         return status;
 325 }
 326
 327 /*
 328   setup our replication partners
 329 */
 330 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 331 {
 332         NTSTATUS status;
 333
 334         status = wreplsrv_load_partners(service);
 335         NT_STATUS_NOT_OK_RETURN(status);
 336
 337         status = wreplsrv_load_table(service);
 338         NT_STATUS_NOT_OK_RETURN(status);
 339
 340         return NT_STATUS_OK;
 341 }
 342
 343 /*
 344   startup the wrepl task
 345 */
 346 static void wreplsrv_task_init(struct task_server *task)
 347 {
 348         NTSTATUS status;
 349         struct wreplsrv_service *service;
 350
 351         service = talloc_zero(task, struct wreplsrv_service);
 352         if (!service) {
 353                 task_server_terminate(task, "wreplsrv_task_init: out of memory");
 354                 return;
 355         }
 356         service->task           = task;
 357         service->startup_time   = timeval_current();
 358         task->private           = service;
 359
 360         /*
 361          * setup up all partners, and open the winsdb
 362          */
 363         status = wreplsrv_open_winsdb(service);
 364         if (!NT_STATUS_IS_OK(status)) {
 365                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed");
 366                 return;
 367         }
 368
 369         /*
 370          * setup timed events for each partner we want to pull from
 371          */
 372         status = wreplsrv_setup_partners(service);
 373         if (!NT_STATUS_IS_OK(status)) {
 374                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed");
 375                 return;
 376         }
 377
 378         /*
 379          * setup listen sockets, so we can anwser requests from our partners,
 380          * which pull from us
 381          */
 382         status = wreplsrv_setup_sockets(service);
 383         if (!NT_STATUS_IS_OK(status)) {
 384                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed");
 385                 return;
 386         }
 387
 388         status = wreplsrv_setup_periodic(service);
 389         if (!NT_STATUS_IS_OK(status)) {
 390                 task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed");
 391                 return;
 392         }
 393
 394         irpc_add_name(task->msg_ctx, "wrepl_server");
 395 }
 396
 397 /*
 398   initialise the WREPL server
 399  */
 400 static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
 401 {
 402         if (!lp_wins_support()) {
 403                 return NT_STATUS_OK;
 404         }
 405
 406         return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
 407 }
 408
 409 /*
 410   register ourselves as a available server
 411 */
 412 NTSTATUS server_service_wrepl_init(void)
 413 {
 414         return register_server_service("wrepl", wreplsrv_init);
 415 }