source/nbt_server/wins/winsdb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    WINS database routines
   5
   6    Copyright (C) Andrew Tridgell        2005
   7    Copyright (C) Stefan Metzmacher      2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "nbt_server/nbt_server.h"
  26 #include "nbt_server/wins/winsdb.h"
  27 #include "lib/ldb/include/ldb.h"
  28 #include "lib/ldb/include/ldb_errors.h"
  29 #include "system/time.h"
  30 #include "auth/auth.h"
  31
  32 /*
  33   return the new maxVersion and save it
  34 */
  35 static uint64_t winsdb_allocate_version(struct winsdb_handle *h)
  36 {
  37         int trans;
  38         int ret;
  39         struct ldb_dn *dn;
  40         struct ldb_result *res = NULL;
  41         struct ldb_message *msg = NULL;
  42         struct ldb_context *wins_db = h->ldb;
  43         TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
  44         uint64_t maxVersion = 0;
  45
  46         trans = ldb_transaction_start(wins_db);
  47         if (trans != LDB_SUCCESS) goto failed;
  48
  49         dn = ldb_dn_explode(tmp_ctx, "CN=VERSION");
  50         if (!dn) goto failed;
  51
  52         /* find the record in the WINS database */
  53         ret = ldb_search(wins_db, dn, LDB_SCOPE_BASE, NULL, NULL, &res);
  54
  55         if (ret != LDB_SUCCESS) goto failed;
  56         if (res->count > 1) goto failed;
  57
  58         talloc_steal(tmp_ctx, res);
  59
  60         if (res->count == 1) {
  61                 maxVersion = ldb_msg_find_uint64(res->msgs[0], "maxVersion", 0);
  62         }
  63         maxVersion++;
  64
  65         msg = ldb_msg_new(tmp_ctx);
  66         if (!msg) goto failed;
  67         msg->dn = dn;
  68
  69
  70         ret = ldb_msg_add_empty(msg, "objectClass", LDB_FLAG_MOD_REPLACE);
  71         if (ret != 0) goto failed;
  72         ret = ldb_msg_add_string(msg, "objectClass", "winsMaxVersion");
  73         if (ret != 0) goto failed;
  74         ret = ldb_msg_add_empty(msg, "maxVersion", LDB_FLAG_MOD_REPLACE);
  75         if (ret != 0) goto failed;
  76         ret = ldb_msg_add_fmt(msg, "maxVersion", "%llu", (long long)maxVersion);
  77         if (ret != 0) goto failed;
  78
  79         ret = ldb_modify(wins_db, msg);
  80         if (ret != 0) ret = ldb_add(wins_db, msg);
  81         if (ret != 0) goto failed;
  82
  83         trans = ldb_transaction_commit(wins_db);
  84         if (trans != LDB_SUCCESS) goto failed;
  85
  86         talloc_free(tmp_ctx);
  87         return maxVersion;
  88
  89 failed:
  90         if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
  91         talloc_free(tmp_ctx);
  92         return 0;
  93 }
  94
  95 /*
  96   return a DN for a nbt_name
  97 */
  98 static struct ldb_dn *winsdb_dn(TALLOC_CTX *mem_ctx, struct nbt_name *name)
  99 {
 100         struct ldb_dn *dn;
 101
 102         dn = ldb_dn_string_compose(mem_ctx, NULL, "type=0x%02X", name->type);
 103         if (dn && name->name && *name->name) {
 104                 dn = ldb_dn_string_compose(mem_ctx, dn, "name=%s", name->name);
 105         }
 106         if (dn && name->scope && *name->scope) {
 107                 dn = ldb_dn_string_compose(mem_ctx, dn, "scope=%s", name->scope);
 108         }
 109         return dn;
 110 }
 111
 112 static NTSTATUS winsdb_nbt_name(TALLOC_CTX *mem_ctx, struct ldb_dn *dn, struct nbt_name **_name)
 113 {
 114         NTSTATUS status;
 115         struct nbt_name *name;
 116         uint32_t cur = 0;
 117
 118         name = talloc(mem_ctx, struct nbt_name);
 119         if (!name) {
 120                 status = NT_STATUS_NO_MEMORY;
 121                 goto failed;
 122         }
 123
 124         if (dn->comp_num > 3) {
 125                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 126                 goto failed;
 127         }
 128
 129         if (dn->comp_num > cur && strcasecmp("scope", dn->components[cur].name) == 0) {
 130                 name->scope     = talloc_steal(name, dn->components[cur].value.data);
 131                 cur++;
 132         } else {
 133                 name->scope     = NULL;
 134         }
 135
 136         if (dn->comp_num > cur && strcasecmp("name", dn->components[cur].name) == 0) {
 137                 name->name      = talloc_steal(name, dn->components[cur].value.data);
 138                 cur++;
 139         } else {
 140                 name->name      = talloc_strdup(name, "");
 141                 if (!name->name) {
 142                         status = NT_STATUS_NO_MEMORY;
 143                         goto failed;
 144                 }
 145         }
 146
 147         if (dn->comp_num > cur && strcasecmp("type", dn->components[cur].name) == 0) {
 148                 name->type      = strtoul((char *)dn->components[cur].value.data, NULL, 0);
 149                 cur++;
 150         } else {
 151                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 152                 goto failed;
 153         }
 154
 155         *_name = name;
 156         return NT_STATUS_OK;
 157 failed:
 158         talloc_free(name);
 159         return status;
 160 }
 161
 162 /*
 163  decode the winsdb_addr("address") attribute:
 164  "172.31.1.1" or
 165  "172.31.1.1;winsOwner:172.31.9.202;expireTime:20050923032330.0Z;"
 166  are valid records
 167 */
 168 static NTSTATUS winsdb_addr_decode(struct winsdb_record *rec, struct ldb_val *val,
 169                                    TALLOC_CTX *mem_ctx, struct winsdb_addr **_addr)
 170 {
 171         NTSTATUS status;
 172         struct winsdb_addr *addr;
 173         char *address;
 174         char *wins_owner;
 175         char *expire_time;
 176         char *p;
 177
 178         addr = talloc(mem_ctx, struct winsdb_addr);
 179         if (!addr) {
 180                 status = NT_STATUS_NO_MEMORY;
 181                 goto failed;
 182         }
 183
 184         address = (char *)val->data;
 185
 186         p = strchr(address, ';');
 187         if (!p) {
 188                 /* support old entries, with only the address */
 189                 addr->address           = talloc_steal(addr, val->data);
 190                 addr->wins_owner        = talloc_reference(addr, rec->wins_owner);
 191                 if (!addr->wins_owner) {
 192                         status = NT_STATUS_NO_MEMORY;
 193                         goto failed;
 194                 }
 195                 addr->expire_time       = rec->expire_time;
 196                 *_addr = addr;
 197                 return NT_STATUS_OK;
 198         }
 199
 200         *p = '\0';p++;
 201         addr->address = talloc_strdup(addr, address);
 202         if (!addr->address) {
 203                 status = NT_STATUS_NO_MEMORY;
 204                 goto failed;
 205         }
 206
 207         if (strncmp("winsOwner:", p, 10) != 0) {
 208                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 209                 goto failed;
 210         }
 211         wins_owner = p + 10;
 212         p = strchr(wins_owner, ';');
 213         if (!p) {
 214                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 215                 goto failed;
 216         }
 217
 218         *p = '\0';p++;
 219         addr->wins_owner = talloc_strdup(addr, wins_owner);
 220         if (!addr->wins_owner) {
 221                 status = NT_STATUS_NO_MEMORY;
 222                 goto failed;
 223         }
 224
 225         if (strncmp("expireTime:", p, 11) != 0) {
 226                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 227                 goto failed;
 228         }
 229
 230         expire_time = p + 11;
 231         p = strchr(expire_time, ';');
 232         if (!p) {
 233                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 234                 goto failed;
 235         }
 236
 237         *p = '\0';p++;
 238         addr->expire_time = ldb_string_to_time(expire_time);
 239
 240         *_addr = addr;
 241         return NT_STATUS_OK;
 242 failed:
 243         talloc_free(addr);
 244         return status;
 245 }
 246
 247 /*
 248  encode the winsdb_addr("address") attribute like this:
 249  "172.31.1.1;winsOwner:172.31.9.202;expireTime:20050923032330.0Z;"
 250 */
 251 static int ldb_msg_add_winsdb_addr(struct ldb_message *msg,
 252                                    const char *attr_name, struct winsdb_addr *addr)
 253 {
 254         struct ldb_val val;
 255         const char *str;
 256
 257         str = talloc_asprintf(msg, "%s;winsOwner:%s;expireTime:%s;",
 258                               addr->address, addr->wins_owner,
 259                               ldb_timestring(msg, addr->expire_time));
 260         if (!str) return -1;
 261
 262         val.data = discard_const_p(uint8_t, str);
 263         val.length = strlen(str);
 264
 265         return ldb_msg_add_value(msg, attr_name, &val);
 266 }
 267
 268 struct winsdb_addr **winsdb_addr_list_make(TALLOC_CTX *mem_ctx)
 269 {
 270         struct winsdb_addr **addresses;
 271
 272         addresses = talloc_array(mem_ctx, struct winsdb_addr *, 1);
 273         if (!addresses) return NULL;
 274
 275         addresses[0] = NULL;
 276
 277         return addresses;
 278 }
 279
 280 struct winsdb_addr **winsdb_addr_list_add(struct winsdb_addr **addresses, const char *address,
 281                                           const char *wins_owner, time_t expire_time)
 282 {
 283         size_t len = winsdb_addr_list_length(addresses);
 284
 285         addresses = talloc_realloc(addresses, addresses, struct winsdb_addr *, len + 2);
 286         if (!addresses) return NULL;
 287
 288         addresses[len] = talloc(addresses, struct winsdb_addr);
 289         if (!addresses[len]) {
 290                 talloc_free(addresses);
 291                 return NULL;
 292         }
 293
 294         addresses[len]->address = talloc_strdup(addresses[len], address);
 295         if (!addresses[len]->address) {
 296                 talloc_free(addresses);
 297                 return NULL;
 298         }
 299
 300         addresses[len]->wins_owner = talloc_strdup(addresses[len], wins_owner);
 301         if (!addresses[len]->wins_owner) {
 302                 talloc_free(addresses);
 303                 return NULL;
 304         }
 305
 306         addresses[len]->expire_time = expire_time;
 307
 308         addresses[len+1] = NULL;
 309
 310         return addresses;
 311 }
 312
 313 void winsdb_addr_list_remove(struct winsdb_addr **addresses, const char *address)
 314 {
 315         size_t i;
 316
 317         for (i=0; addresses[i]; i++) {
 318                 if (strcmp(addresses[i]->address, address) == 0) {
 319                         break;
 320                 }
 321         }
 322         if (!addresses[i]) return;
 323
 324         for (; addresses[i]; i++) {
 325                 addresses[i] = addresses[i+1];
 326         }
 327
 328         return;
 329 }
 330
 331 struct winsdb_addr *winsdb_addr_list_check(struct winsdb_addr **addresses, const char *address)
 332 {
 333         size_t i;
 334
 335         for (i=0; addresses[i]; i++) {
 336                 if (strcmp(addresses[i]->address, address) == 0) {
 337                         return addresses[i];
 338                 }
 339         }
 340
 341         return NULL;
 342 }
 343
 344 size_t winsdb_addr_list_length(struct winsdb_addr **addresses)
 345 {
 346         size_t i;
 347         for (i=0; addresses[i]; i++);
 348         return i;
 349 }
 350
 351 const char **winsdb_addr_string_list(TALLOC_CTX *mem_ctx, struct winsdb_addr **addresses)
 352 {
 353         size_t len = winsdb_addr_list_length(addresses);
 354         const char **str_list=NULL;
 355         size_t i;
 356
 357         for (i=0; i < len; i++) {
 358                 str_list = str_list_add(str_list, addresses[i]->address);
 359                 if (!str_list[i]) {
 360                         return NULL;
 361                 }
 362         }
 363         talloc_steal(mem_ctx, str_list);
 364         return str_list;
 365 }
 366
 367 /*
 368   load a WINS entry from the database
 369 */
 370 NTSTATUS winsdb_lookup(struct winsdb_handle *h,
 371                        struct nbt_name *name,
 372                        TALLOC_CTX *mem_ctx,
 373                        struct winsdb_record **_rec)
 374 {
 375         NTSTATUS status;
 376         struct ldb_result *res = NULL;
 377         int ret;
 378         struct winsdb_record *rec;
 379         struct ldb_context *wins_db = h->ldb;
 380         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 381
 382         /* find the record in the WINS database */
 383         ret = ldb_search(wins_db, winsdb_dn(tmp_ctx, name), LDB_SCOPE_BASE,
 384                          NULL, NULL, &res);
 385
 386         if (ret != LDB_SUCCESS || res->count > 1) {
 387                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 388                 goto failed;
 389         } else if (res->count== 0) {
 390                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
 391                 goto failed;
 392         }
 393
 394         talloc_steal(tmp_ctx, res);
 395
 396         status = winsdb_record(res->msgs[0], tmp_ctx, &rec);
 397         if (!NT_STATUS_IS_OK(status)) goto failed;
 398
 399         /* see if it has already expired */
 400         if (rec->state == WREPL_STATE_ACTIVE &&
 401             rec->expire_time <= time(NULL)) {
 402                 DEBUG(5,("WINS: expiring name %s (expired at %s)\n",
 403                          nbt_name_string(tmp_ctx, rec->name), timestring(tmp_ctx, rec->expire_time)));
 404                 rec->state = WREPL_STATE_RELEASED;
 405         }
 406
 407         talloc_steal(mem_ctx, rec);
 408         talloc_free(tmp_ctx);
 409         *_rec = rec;
 410         return NT_STATUS_OK;
 411
 412 failed:
 413         talloc_free(tmp_ctx);
 414         return status;
 415 }
 416
 417 NTSTATUS winsdb_record(struct ldb_message *msg, TALLOC_CTX *mem_ctx, struct winsdb_record **_rec)
 418 {
 419         NTSTATUS status;
 420         struct winsdb_record *rec;
 421         struct ldb_message_element *el;
 422         struct nbt_name *name;
 423         uint32_t i, num_values;
 424
 425         rec = talloc(mem_ctx, struct winsdb_record);
 426         if (rec == NULL) {
 427                 status = NT_STATUS_NO_MEMORY;
 428                 goto failed;
 429         }
 430
 431         status = winsdb_nbt_name(rec, msg->dn, &name);
 432         if (!NT_STATUS_IS_OK(status)) goto failed;
 433
 434         if (strlen(name->name) > 15) {
 435                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 436                 goto failed;
 437         }
 438         if (name->scope && strlen(name->scope) > 238) {
 439                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 440                 goto failed;
 441         }
 442
 443         /* parse it into a more convenient winsdb_record structure */
 444         rec->name               = name;
 445         rec->type               = ldb_msg_find_int(msg, "recordType", WREPL_TYPE_UNIQUE);
 446         rec->state              = ldb_msg_find_int(msg, "recordState", WREPL_STATE_RELEASED);
 447         rec->node               = ldb_msg_find_int(msg, "nodeType", WREPL_NODE_B);
 448         rec->is_static          = ldb_msg_find_int(msg, "isStatic", 0);
 449         rec->expire_time        = ldb_string_to_time(ldb_msg_find_string(msg, "expireTime", NULL));
 450         rec->version            = ldb_msg_find_uint64(msg, "versionID", 0);
 451         rec->wins_owner         = ldb_msg_find_string(msg, "winsOwner", NULL);
 452         rec->registered_by      = ldb_msg_find_string(msg, "registeredBy", NULL);
 453         talloc_steal(rec, rec->wins_owner);
 454         talloc_steal(rec, rec->registered_by);
 455
 456         if (!rec->wins_owner) {
 457                 rec->wins_owner = talloc_strdup(rec, WINSDB_OWNER_LOCAL);
 458                 if (rec->wins_owner == NULL) {
 459                         status = NT_STATUS_NO_MEMORY;
 460                         goto failed;
 461                 }
 462         }
 463
 464         el = ldb_msg_find_element(msg, "address");
 465         if (el) {
 466                 num_values = el->num_values;
 467         } else {
 468                 num_values = 0;
 469         }
 470
 471         if (rec->type == WREPL_TYPE_UNIQUE || rec->type == WREPL_TYPE_GROUP) {
 472                 if (num_values != 1) {
 473                         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 474                         goto failed;
 475                 }
 476         }
 477         if (rec->state == WREPL_STATE_ACTIVE) {
 478                 if (num_values < 1) {
 479                         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 480                         goto failed;
 481                 }
 482         }
 483
 484         rec->addresses     = talloc_array(rec, struct winsdb_addr *, num_values+1);
 485         if (rec->addresses == NULL) {
 486                 status = NT_STATUS_NO_MEMORY;
 487                 goto failed;
 488         }
 489
 490         for (i=0;i<num_values;i++) {
 491                 status = winsdb_addr_decode(rec, &el->values[i], rec->addresses, &rec->addresses[i]);
 492                 if (!NT_STATUS_IS_OK(status)) goto failed;
 493         }
 494         rec->addresses[i] = NULL;
 495
 496         if (rec->is_static) {
 497                 if (num_values < 1) {
 498                         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 499                         goto failed;
 500                 }
 501                 rec->state = WREPL_STATE_ACTIVE;
 502                 rec->expire_time = get_time_t_max();
 503                 for (i=0;rec->addresses[i];i++) {
 504                         rec->addresses[i]->expire_time = rec->expire_time;
 505                 }
 506         }
 507
 508         *_rec = rec;
 509         return NT_STATUS_OK;
 510 failed:
 511         if (NT_STATUS_EQUAL(NT_STATUS_INTERNAL_DB_CORRUPTION, status)) {
 512                 DEBUG(1,("winsdb_record: corrupted record: %s\n", ldb_dn_linearize(rec, msg->dn)));
 513         }
 514         talloc_free(rec);
 515         return status;
 516 }
 517
 518 /*
 519   form a ldb_message from a winsdb_record
 520 */
 521 struct ldb_message *winsdb_message(struct ldb_context *ldb,
 522                                    struct winsdb_record *rec, TALLOC_CTX *mem_ctx)
 523 {
 524         int i, ret=0;
 525         size_t addr_count;
 526         struct ldb_message *msg = ldb_msg_new(mem_ctx);
 527         if (msg == NULL) goto failed;
 528
 529         if (rec->is_static) {
 530                 rec->state = WREPL_STATE_ACTIVE;
 531                 rec->expire_time = get_time_t_max();
 532                 for (i=0;rec->addresses[i];i++) {
 533                         rec->addresses[i]->expire_time = rec->expire_time;
 534                 }
 535         }
 536
 537         /* make sure we don't put in corrupted records */
 538         addr_count = winsdb_addr_list_length(rec->addresses);
 539         if (rec->state == WREPL_STATE_ACTIVE && addr_count == 0) {
 540                 rec->state = WREPL_STATE_RELEASED;
 541         }
 542         if (rec->type == WREPL_TYPE_UNIQUE && addr_count > 1) {
 543                 rec->type = WREPL_TYPE_MHOMED;
 544         }
 545
 546         msg->dn = winsdb_dn(msg, rec->name);
 547         if (msg->dn == NULL) goto failed;
 548         ret |= ldb_msg_add_fmt(msg, "type", "0x%02X", rec->name->type);
 549         if (rec->name->name && *rec->name->name) {
 550                 ret |= ldb_msg_add_string(msg, "name", rec->name->name);
 551         }
 552         if (rec->name->scope && *rec->name->scope) {
 553                 ret |= ldb_msg_add_string(msg, "scope", rec->name->scope);
 554         }
 555         ret |= ldb_msg_add_fmt(msg, "objectClass", "winsRecord");
 556         ret |= ldb_msg_add_fmt(msg, "recordType", "%u", rec->type);
 557         ret |= ldb_msg_add_fmt(msg, "recordState", "%u", rec->state);
 558         ret |= ldb_msg_add_fmt(msg, "nodeType", "%u", rec->node);
 559         ret |= ldb_msg_add_fmt(msg, "isStatic", "%u", rec->is_static);
 560         ret |= ldb_msg_add_string(msg, "expireTime",
 561                                   ldb_timestring(msg, rec->expire_time));
 562         ret |= ldb_msg_add_fmt(msg, "versionID", "%llu", (long long)rec->version);
 563         ret |= ldb_msg_add_string(msg, "winsOwner", rec->wins_owner);
 564         ret |= ldb_msg_add_empty(msg, "address", 0);
 565         for (i=0;rec->addresses[i];i++) {
 566                 ret |= ldb_msg_add_winsdb_addr(msg, "address", rec->addresses[i]);
 567         }
 568         ret |= ldb_msg_add_empty(msg, "registeredBy", 0);
 569         if (rec->registered_by) {
 570                 ret |= ldb_msg_add_string(msg, "registeredBy", rec->registered_by);
 571                 if (ret != 0) goto failed;
 572         }
 573         return msg;
 574
 575 failed:
 576         talloc_free(msg);
 577         return NULL;
 578 }
 579
 580 /*
 581   save a WINS record into the database
 582 */
 583 uint8_t winsdb_add(struct winsdb_handle *h, struct winsdb_record *rec, uint32_t flags)
 584 {
 585         struct ldb_message *msg;
 586         struct ldb_context *wins_db = h->ldb;
 587         TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
 588         int trans = -1;
 589         int ret = 0;
 590
 591         trans = ldb_transaction_start(wins_db);
 592         if (trans != LDB_SUCCESS) goto failed;
 593
 594         if (flags & WINSDB_FLAG_ALLOC_VERSION) {
 595                 rec->version = winsdb_allocate_version(h);
 596                 if (rec->version == 0) goto failed;
 597         }
 598         if (flags & WINSDB_FLAG_TAKE_OWNERSHIP) {
 599                 rec->wins_owner = WINSDB_OWNER_LOCAL;
 600         }
 601
 602         msg = winsdb_message(wins_db, rec, tmp_ctx);
 603         if (msg == NULL) goto failed;
 604         ret = ldb_add(wins_db, msg);
 605         if (ret != 0) goto failed;
 606
 607         trans = ldb_transaction_commit(wins_db);
 608         if (trans != LDB_SUCCESS) goto failed;
 609
 610         talloc_free(tmp_ctx);
 611         return NBT_RCODE_OK;
 612
 613 failed:
 614         if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
 615         talloc_free(tmp_ctx);
 616         return NBT_RCODE_SVR;
 617 }
 618
 619
 620 /*
 621   modify a WINS record in the database
 622 */
 623 uint8_t winsdb_modify(struct winsdb_handle *h, struct winsdb_record *rec, uint32_t flags)
 624 {
 625         struct ldb_message *msg;
 626         struct ldb_context *wins_db = h->ldb;
 627         TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
 628         int trans;
 629         int ret;
 630         int i;
 631
 632         trans = ldb_transaction_start(wins_db);
 633         if (trans != LDB_SUCCESS) goto failed;
 634
 635         if (flags & WINSDB_FLAG_ALLOC_VERSION) {
 636                 rec->version = winsdb_allocate_version(h);
 637                 if (rec->version == 0) goto failed;
 638         }
 639         if (flags & WINSDB_FLAG_TAKE_OWNERSHIP) {
 640                 rec->wins_owner = WINSDB_OWNER_LOCAL;
 641         }
 642
 643         msg = winsdb_message(wins_db, rec, tmp_ctx);
 644         if (msg == NULL) goto failed;
 645
 646         for (i=0;i<msg->num_elements;i++) {
 647                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 648         }
 649
 650         ret = ldb_modify(wins_db, msg);
 651         if (ret != 0) goto failed;
 652
 653         trans = ldb_transaction_commit(wins_db);
 654         if (trans != LDB_SUCCESS) goto failed;
 655
 656         talloc_free(tmp_ctx);
 657         return NBT_RCODE_OK;
 658
 659 failed:
 660         if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
 661         talloc_free(tmp_ctx);
 662         return NBT_RCODE_SVR;
 663 }
 664
 665
 666 /*
 667   delete a WINS record from the database
 668 */
 669 uint8_t winsdb_delete(struct winsdb_handle *h, struct winsdb_record *rec)
 670 {
 671         struct ldb_context *wins_db = h->ldb;
 672         TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
 673         const struct ldb_dn *dn;
 674         int trans;
 675         int ret;
 676
 677         trans = ldb_transaction_start(wins_db);
 678         if (trans != LDB_SUCCESS) goto failed;
 679
 680         dn = winsdb_dn(tmp_ctx, rec->name);
 681         if (dn == NULL) goto failed;
 682
 683         ret = ldb_delete(wins_db, dn);
 684         if (ret != 0) goto failed;
 685
 686         trans = ldb_transaction_commit(wins_db);
 687         if (trans != LDB_SUCCESS) goto failed;
 688
 689         talloc_free(tmp_ctx);
 690         return NBT_RCODE_OK;
 691
 692 failed:
 693         if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
 694         talloc_free(tmp_ctx);
 695         return NBT_RCODE_SVR;
 696 }
 697
 698 struct winsdb_handle *winsdb_connect(TALLOC_CTX *mem_ctx)
 699 {
 700         struct winsdb_handle *h = NULL;
 701
 702         h = talloc(mem_ctx, struct winsdb_handle);
 703         if (!h) return NULL;
 704
 705         h->ldb = ldb_wrap_connect(h, lock_path(h, lp_wins_url()),
 706                                   system_session(h), NULL, 0, NULL);
 707         if (!h->ldb) goto failed;
 708
 709         return h;
 710 failed:
 711         talloc_free(h);
 712         return NULL;
 713 }