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 "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         return NT_STATUS_OK;
  59 }
  60
  61 struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
  62 {
  63         struct wreplsrv_partner *cur;
  64
  65         for (cur = service->partners; cur; cur = cur->next) {
  66                 if (strcmp(cur->address, peer_addr) == 0) {
  67                         return cur;
  68                 }
  69         }
  70
  71         return NULL;
  72 }
  73
  74 /*
  75   load our replication partners
  76 */
  77 static NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
  78 {
  79         struct ldb_result *res = NULL;
  80         int ret;
  81         TALLOC_CTX *tmp_ctx = talloc_new(service);
  82         int i;
  83
  84         /* find the record in the WINS database */
  85         ret = ldb_search(service->wins_db, ldb_dn_explode(tmp_ctx, "CN=PARTNERS"), LDB_SCOPE_ONELEVEL,
  86                          "(objectClass=wreplPartner)", NULL, &res);
  87         if (ret != LDB_SUCCESS) goto failed;
  88         talloc_steal(tmp_ctx, res);
  89         if (res->count == 0) goto done;
  90
  91         for (i=0; i < res->count; i++) {
  92                 struct wreplsrv_partner *partner;
  93
  94                 partner = talloc_zero(service, struct wreplsrv_partner);
  95                 if (partner == NULL) goto failed;
  96
  97                 partner->service                = service;
  98                 partner->address                = ldb_msg_find_string(res->msgs[i], "address", NULL);
  99                 if (!partner->address) goto failed;
 100                 partner->name                   = ldb_msg_find_string(res->msgs[i], "name", partner->address);
 101                 partner->type                   = ldb_msg_find_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
 102                 partner->pull.interval          = ldb_msg_find_uint(res->msgs[i], "pullInterval",
 103                                                                     WINSREPL_DEFAULT_PULL_INTERVAL);
 104                 partner->pull.retry_interval    = ldb_msg_find_uint(res->msgs[i], "pullRetryInterval",
 105                                                                     WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
 106                 partner->our_address            = ldb_msg_find_string(res->msgs[i], "ourAddress", NULL);
 107                 partner->push.change_count      = ldb_msg_find_uint(res->msgs[i], "pushChangeCount",
 108                                                                     WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
 109
 110                 talloc_steal(partner, partner->address);
 111                 talloc_steal(partner, partner->name);
 112                 talloc_steal(partner, partner->our_address);
 113
 114                 DLIST_ADD(service->partners, partner);
 115         }
 116 done:
 117         talloc_free(tmp_ctx);
 118         return NT_STATUS_OK;
 119 failed:
 120         talloc_free(tmp_ctx);
 121         return NT_STATUS_FOOBAR;
 122 }
 123
 124 BOOL wreplsrv_is_our_address(struct wreplsrv_service *service, const char *address)
 125 {
 126         const char *our_address;
 127
 128         if (lp_interfaces() && lp_bind_interfaces_only()) {
 129                 int num_interfaces = iface_count();
 130                 int i;
 131                 for(i = 0; i < num_interfaces; i++) {
 132                         our_address = iface_n_ip(i);
 133                         if (strcasecmp(our_address, address) == 0) {
 134                                 return True;
 135                         }
 136                 }
 137         } else {
 138                 our_address = lp_socket_address();
 139                 if (strcasecmp(our_address, address) == 0) {
 140                         return True;
 141                 }
 142         }
 143
 144         return False;
 145 }
 146
 147 uint64_t wreplsrv_local_max_version(struct wreplsrv_service *service)
 148 {
 149         int ret;
 150         struct ldb_context *ldb = service->wins_db;
 151         struct ldb_dn *dn;
 152         struct ldb_result *res = NULL;
 153         TALLOC_CTX *tmp_ctx = talloc_new(service);
 154         uint64_t maxVersion = 0;
 155
 156         dn = ldb_dn_explode(tmp_ctx, "CN=VERSION");
 157         if (!dn) goto failed;
 158
 159         /* find the record in the WINS database */
 160         ret = ldb_search(ldb, dn, LDB_SCOPE_BASE,
 161                          NULL, NULL, &res);
 162         if (ret != LDB_SUCCESS) goto failed;
 163         talloc_steal(tmp_ctx, res);
 164         if (res->count > 1) goto failed;
 165
 166         if (res->count == 1) {
 167                 maxVersion = ldb_msg_find_uint64(res->msgs[0], "maxVersion", 0);
 168         }
 169
 170 failed:
 171         talloc_free(tmp_ctx);
 172         return maxVersion;
 173 }
 174
 175 NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
 176                                    TALLOC_CTX *mem_ctx,
 177                                    struct wrepl_table *table_out,
 178                                    const char *our_ip,
 179                                    const char *initiator,
 180                                    BOOL full_table)
 181 {
 182         struct wreplsrv_owner *cur;
 183         uint64_t local_max_version;
 184         uint32_t i = 0;
 185
 186         table_out->partner_count        = 0;
 187         table_out->partners             = NULL;
 188         table_out->initiator            = initiator;
 189
 190         local_max_version = wreplsrv_local_max_version(service);
 191         if (local_max_version > 0) {
 192                 table_out->partner_count++;
 193         }
 194
 195         for (cur = service->table; full_table && cur; cur = cur->next) {
 196                 table_out->partner_count++;
 197         }
 198
 199         table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
 200         NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
 201
 202         if (local_max_version > 0) {
 203                 table_out->partners[i].address          = our_ip;
 204                 table_out->partners[i].min_version      = 0;
 205                 table_out->partners[i].max_version      = local_max_version;
 206                 table_out->partners[i].type             = 1;
 207                 i++;
 208         }
 209
 210         for (cur = service->table; full_table && cur; cur = cur->next) {
 211                 table_out->partners[i] = cur->owner;
 212                 i++;
 213         }
 214
 215         return NT_STATUS_OK;
 216 }
 217
 218 struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_owner *table, const char *wins_owner)
 219 {
 220         struct wreplsrv_owner *cur;
 221
 222         for (cur = table; cur; cur = cur->next) {
 223                 if (strcmp(cur->owner.address, wins_owner) == 0) {
 224                         return cur;
 225                 }
 226         }
 227
 228         return NULL;
 229 }
 230
 231 /*
 232  update the wins_owner_table max_version, if the given version is the highest version
 233  if no entry for the wins_owner exists yet, create one
 234 */
 235 NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
 236                             TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
 237                             const char *wins_owner, uint64_t version)
 238 {
 239         struct wreplsrv_owner *table = *_table;
 240         struct wreplsrv_owner *cur;
 241
 242         if (strcmp(WINSDB_OWNER_LOCAL, wins_owner) == 0) {
 243                 return NT_STATUS_OK;
 244         }
 245
 246         cur = wreplsrv_find_owner(table, wins_owner);
 247
 248         /* if it doesn't exists yet, create one */
 249         if (!cur) {
 250                 cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
 251                 NT_STATUS_HAVE_NO_MEMORY(cur);
 252
 253                 cur->owner.address      = talloc_strdup(cur, wins_owner);
 254                 NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
 255                 cur->owner.min_version  = 0;
 256                 cur->owner.max_version  = 0;
 257                 cur->owner.type         = 1; /* don't know why this is always 1 */
 258
 259                 cur->partner            = wreplsrv_find_partner(service, wins_owner);
 260
 261                 DLIST_ADD(table, cur);
 262                 *_table = table;
 263         }
 264
 265         /* the min_version is always 0 here, and won't be updated */
 266
 267         /* if the given version is higher the then current nax_version, update */
 268         if (cur->owner.max_version < version) {
 269                 cur->owner.max_version = version;
 270         }
 271
 272         return NT_STATUS_OK;
 273 }
 274
 275 /*
 276   load the partner table
 277 */
 278 static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
 279 {
 280         struct ldb_result *res = NULL;
 281         int ret;
 282         NTSTATUS status;
 283         TALLOC_CTX *tmp_ctx = talloc_new(service);
 284         int i;
 285         const char *wins_owner;
 286         uint64_t version;
 287         const char * const attrs[] = {
 288                 "winsOwner",
 289                 "versionID",
 290                 NULL
 291         };
 292
 293         /* find the record in the WINS database */
 294         ret = ldb_search(service->wins_db, NULL, LDB_SCOPE_SUBTREE,
 295                          "(objectClass=winsRecord)", attrs, &res);
 296         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 297         if (ret != LDB_SUCCESS) goto failed;
 298         talloc_steal(tmp_ctx, res);
 299         if (res->count == 0) goto done;
 300
 301         for (i=0; i < res->count; i++) {
 302                 wins_owner     = ldb_msg_find_string(res->msgs[i], "winsOwner", NULL);
 303                 version        = ldb_msg_find_uint64(res->msgs[i], "versionID", 0);
 304
 305                 if (wins_owner) {
 306                         status = wreplsrv_add_table(service,
 307                                                     service, &service->table,
 308                                                     wins_owner, version);
 309                         if (!NT_STATUS_IS_OK(status)) goto failed;
 310                 }
 311                 talloc_free(res->msgs[i]);
 312
 313                 /* TODO: what's abut the per address owners? */
 314         }
 315 done:
 316         talloc_free(tmp_ctx);
 317         return NT_STATUS_OK;
 318 failed:
 319         talloc_free(tmp_ctx);
 320         return status;
 321 }
 322
 323 /*
 324   setup our replication partners
 325 */
 326 static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
 327 {
 328         NTSTATUS status;
 329
 330         status = wreplsrv_load_partners(service);
 331         NT_STATUS_NOT_OK_RETURN(status);
 332
 333         status = wreplsrv_load_table(service);
 334         NT_STATUS_NOT_OK_RETURN(status);
 335
 336         status = wreplsrv_setup_out_connections(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         irpc_add_name(task->msg_ctx, "wrepl_server");
 387 }
 388
 389 /*
 390   initialise the WREPL server
 391  */
 392 static NTSTATUS wreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
 393 {
 394         if (!lp_wins_support()) {
 395                 return NT_STATUS_OK;
 396         }
 397
 398         return task_server_startup(event_ctx, model_ops, wreplsrv_task_init);
 399 }
 400
 401 /*
 402   register ourselves as a available server
 403 */
 404 NTSTATUS server_service_wrepl_init(void)
 405 {
 406         return register_server_service("wrepl", wreplsrv_init);
 407 }