root/source4/nbt_server/wins/winsdb.c

/* [<][>][^][v][top][bottom][index][help] */

DEFINITIONS

This source file includes following definitions.
  1. winsdb_get_maxVersion
  2. winsdb_set_maxVersion
  3. winsdb_get_seqnumber
  4. winsdb_dn
  5. winsdb_nbt_name
  6. winsdb_addr_decode
  7. ldb_msg_add_winsdb_addr
  8. winsdb_addr_list_make
  9. winsdb_addr_sort_list
  10. winsdb_addr_list_add
  11. winsdb_addr_list_remove
  12. winsdb_addr_list_check
  13. winsdb_addr_list_length
  14. winsdb_addr_string_list
  15. winsdb_lookup
  16. winsdb_record
  17. winsdb_message
  18. winsdb_add
  19. winsdb_modify
  20. winsdb_delete
  21. winsdb_check_or_add_module_list
  22. winsdb_connect

   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 3 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, see <http://www.gnu.org/licenses/>.
  21 */
  22 
  23 #include "includes.h"
  24 #include "nbt_server/nbt_server.h"
  25 #include "nbt_server/wins/winsdb.h"
  26 #include "lib/ldb/include/ldb.h"
  27 #include "lib/ldb/include/ldb_errors.h"
  28 #include "librpc/gen_ndr/ndr_nbt.h"
  29 #include "system/time.h"
  30 #include "ldb_wrap.h"
  31 #include "system/network.h"
  32 #include "lib/socket/netif.h"
  33 #include "param/param.h"
  34 
  35 uint64_t winsdb_get_maxVersion(struct winsdb_handle *h)
     /* [<][>][^][v][top][bottom][index][help] */
  36 {
  37         int ret;
  38         struct ldb_context *ldb = h->ldb;
  39         struct ldb_dn *dn;
  40         struct ldb_result *res = NULL;
  41         TALLOC_CTX *tmp_ctx = talloc_new(ldb);
  42         uint64_t maxVersion = 0;
  43 
  44         dn = ldb_dn_new(tmp_ctx, ldb, "CN=VERSION");
  45         if (!dn) goto failed;
  46 
  47         /* find the record in the WINS database */
  48         ret = ldb_search(ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
  49         if (ret != LDB_SUCCESS) goto failed;
  50         if (res->count > 1) goto failed;
  51 
  52         if (res->count == 1) {
  53                 maxVersion = ldb_msg_find_attr_as_uint64(res->msgs[0], "maxVersion", 0);
  54         }
  55 
  56 failed:
  57         talloc_free(tmp_ctx);
  58         return maxVersion;
  59 }
  60 
  61 /*
  62  if newVersion == 0 return the old maxVersion + 1 and save it
  63  if newVersion > 0 return MAX(oldMaxVersion, newMaxVersion) and save it
  64 */
  65 uint64_t winsdb_set_maxVersion(struct winsdb_handle *h, uint64_t newMaxVersion)
     /* [<][>][^][v][top][bottom][index][help] */
  66 {
  67         int trans;
  68         int ret;
  69         struct ldb_dn *dn;
  70         struct ldb_result *res = NULL;
  71         struct ldb_message *msg = NULL;
  72         struct ldb_context *wins_db = h->ldb;
  73         TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
  74         uint64_t oldMaxVersion = 0;
  75 
  76         trans = ldb_transaction_start(wins_db);
  77         if (trans != LDB_SUCCESS) goto failed;
  78 
  79         dn = ldb_dn_new(tmp_ctx, wins_db, "CN=VERSION");
  80         if (!dn) goto failed;
  81 
  82         /* find the record in the WINS database */
  83         ret = ldb_search(wins_db, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
  84         if (ret != LDB_SUCCESS) goto failed;
  85         if (res->count > 1) goto failed;
  86 
  87         if (res->count == 1) {
  88                 oldMaxVersion = ldb_msg_find_attr_as_uint64(res->msgs[0], "maxVersion", 0);
  89         }
  90 
  91         if (newMaxVersion == 0) {
  92                 newMaxVersion = oldMaxVersion + 1;
  93         } else {
  94                 newMaxVersion = MAX(oldMaxVersion, newMaxVersion);
  95         }
  96 
  97         msg = ldb_msg_new(tmp_ctx);
  98         if (!msg) goto failed;
  99         msg->dn = dn;
 100 
 101 
 102         ret = ldb_msg_add_empty(msg, "objectClass", LDB_FLAG_MOD_REPLACE, NULL);
 103         if (ret != 0) goto failed;
 104         ret = ldb_msg_add_string(msg, "objectClass", "winsMaxVersion");
 105         if (ret != 0) goto failed;
 106         ret = ldb_msg_add_empty(msg, "maxVersion", LDB_FLAG_MOD_REPLACE, NULL);
 107         if (ret != 0) goto failed;
 108         ret = ldb_msg_add_fmt(msg, "maxVersion", "%llu", (long long)newMaxVersion);
 109         if (ret != 0) goto failed;
 110 
 111         ret = ldb_modify(wins_db, msg);
 112         if (ret != 0) ret = ldb_add(wins_db, msg);
 113         if (ret != 0) goto failed;
 114 
 115         trans = ldb_transaction_commit(wins_db);
 116         if (trans != LDB_SUCCESS) goto failed;
 117 
 118         talloc_free(tmp_ctx);
 119         return newMaxVersion;
 120 
 121 failed:
 122         if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
 123         talloc_free(tmp_ctx);
 124         return 0;
 125 }
 126 
 127 uint64_t winsdb_get_seqnumber(struct winsdb_handle *h)
     /* [<][>][^][v][top][bottom][index][help] */
 128 {
 129         int ret;
 130         struct ldb_context *ldb = h->ldb;
 131         struct ldb_dn *dn;
 132         struct ldb_result *res = NULL;
 133         TALLOC_CTX *tmp_ctx = talloc_new(ldb);
 134         uint64_t seqnumber = 0;
 135 
 136         dn = ldb_dn_new(tmp_ctx, ldb, "@BASEINFO");
 137         if (!dn) goto failed;
 138 
 139         /* find the record in the WINS database */
 140         ret = ldb_search(ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
 141         if (ret != LDB_SUCCESS) goto failed;
 142         if (res->count > 1) goto failed;
 143 
 144         if (res->count == 1) {
 145                 seqnumber = ldb_msg_find_attr_as_uint64(res->msgs[0], "sequenceNumber", 0);
 146         }
 147 
 148 failed:
 149         talloc_free(tmp_ctx);
 150         return seqnumber;
 151 }
 152 
 153 /*
 154   return a DN for a nbt_name
 155 */
 156 static struct ldb_dn *winsdb_dn(TALLOC_CTX *mem_ctx, struct ldb_context *ldb,
     /* [<][>][^][v][top][bottom][index][help] */
 157                                 const struct nbt_name *name)
 158 {
 159         struct ldb_dn *dn;
 160 
 161         dn = ldb_dn_new_fmt(mem_ctx, ldb, "type=0x%02X", name->type);
 162         if (ldb_dn_is_valid(dn) && name->name && *name->name) {
 163                 ldb_dn_add_child_fmt(dn, "name=%s", name->name);
 164         }
 165         if (ldb_dn_is_valid(dn) && name->scope && *name->scope) {
 166                 ldb_dn_add_child_fmt(dn, "scope=%s", name->scope);
 167         }
 168         return dn;
 169 }
 170 
 171 static NTSTATUS winsdb_nbt_name(TALLOC_CTX *mem_ctx, struct ldb_dn *dn, struct nbt_name **_name)
     /* [<][>][^][v][top][bottom][index][help] */
 172 {
 173         NTSTATUS status;
 174         struct nbt_name *name;
 175         unsigned int comp_num;
 176         uint32_t cur = 0;
 177 
 178         name = talloc(mem_ctx, struct nbt_name);
 179         if (!name) {
 180                 status = NT_STATUS_NO_MEMORY;
 181                 goto failed;
 182         }
 183 
 184         comp_num = ldb_dn_get_comp_num(dn);
 185 
 186         if (comp_num > 3) {
 187                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 188                 goto failed;
 189         }
 190 
 191         if (comp_num > cur && strcasecmp("scope", ldb_dn_get_component_name(dn, cur)) == 0) {
 192                 name->scope     = (const char *)talloc_strdup(name, (char *)ldb_dn_get_component_val(dn, cur)->data);
 193                 cur++;
 194         } else {
 195                 name->scope     = NULL;
 196         }
 197 
 198         if (comp_num > cur && strcasecmp("name", ldb_dn_get_component_name(dn, cur)) == 0) {
 199                 name->name      = (const char *)talloc_strdup(name, (char *)ldb_dn_get_component_val(dn, cur)->data);
 200                 cur++;
 201         } else {
 202                 name->name      = talloc_strdup(name, "");
 203                 if (!name->name) {
 204                         status = NT_STATUS_NO_MEMORY;
 205                         goto failed;
 206                 }
 207         }
 208 
 209         if (comp_num > cur && strcasecmp("type", ldb_dn_get_component_name(dn, cur)) == 0) {
 210                 name->type      = strtoul((char *)ldb_dn_get_component_val(dn, cur)->data, NULL, 0);
 211                 cur++;
 212         } else {
 213                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 214                 goto failed;
 215         }
 216 
 217         *_name = name;
 218         return NT_STATUS_OK;
 219 failed:
 220         talloc_free(name);
 221         return status;
 222 }
 223 
 224 /*
 225  decode the winsdb_addr("address") attribute:
 226  "172.31.1.1" or 
 227  "172.31.1.1;winsOwner:172.31.9.202;expireTime:20050923032330.0Z;"
 228  are valid records
 229 */
 230 static NTSTATUS winsdb_addr_decode(struct winsdb_handle *h, struct winsdb_record *rec, struct ldb_val *val,
     /* [<][>][^][v][top][bottom][index][help] */
 231                                    TALLOC_CTX *mem_ctx, struct winsdb_addr **_addr)
 232 {
 233         NTSTATUS status;
 234         struct winsdb_addr *addr;
 235         const char *address;
 236         const char *wins_owner;
 237         const char *expire_time;
 238         char *p;
 239 
 240         addr = talloc(mem_ctx, struct winsdb_addr);
 241         if (!addr) {
 242                 status = NT_STATUS_NO_MEMORY;
 243                 goto failed;
 244         }
 245 
 246         address = (char *)val->data;
 247 
 248         p = strchr(address, ';');
 249         if (!p) {
 250                 /* support old entries, with only the address */
 251                 addr->address           = (const char *)talloc_steal(addr, val->data);
 252                 addr->wins_owner        = talloc_reference(addr, rec->wins_owner);
 253                 if (!addr->wins_owner) {
 254                         status = NT_STATUS_NO_MEMORY;
 255                         goto failed;
 256                 }
 257                 addr->expire_time       = rec->expire_time;
 258                 *_addr = addr;
 259                 return NT_STATUS_OK;
 260         }
 261 
 262         *p = '\0';p++;
 263         addr->address = talloc_strdup(addr, address);
 264         if (!addr->address) {
 265                 status = NT_STATUS_NO_MEMORY;
 266                 goto failed;
 267         }
 268 
 269         if (strncmp("winsOwner:", p, 10) != 0) {
 270                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 271                 goto failed;
 272         }
 273         wins_owner = p + 10;
 274         p = strchr(wins_owner, ';');
 275         if (!p) {
 276                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 277                 goto failed;
 278         }
 279 
 280         *p = '\0';p++;
 281         if (strcmp(wins_owner, "0.0.0.0") == 0) {
 282                 wins_owner = h->local_owner;
 283         }
 284         addr->wins_owner = talloc_strdup(addr, wins_owner);
 285         if (!addr->wins_owner) {
 286                 status = NT_STATUS_NO_MEMORY;
 287                 goto failed;
 288         }
 289 
 290         if (strncmp("expireTime:", p, 11) != 0) {
 291                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 292                 goto failed;
 293         }
 294 
 295         expire_time = p + 11;
 296         p = strchr(expire_time, ';');
 297         if (!p) {
 298                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 299                 goto failed;
 300         }
 301 
 302         *p = '\0';p++;
 303         addr->expire_time = ldb_string_to_time(expire_time);
 304 
 305         *_addr = addr;
 306         return NT_STATUS_OK;
 307 failed:
 308         talloc_free(addr);
 309         return status;
 310 }
 311 
 312 /*
 313  encode the winsdb_addr("address") attribute like this:
 314  non-static record:
 315  "172.31.1.1;winsOwner:172.31.9.202;expireTime:20050923032330.0Z;"
 316  static record:
 317  "172.31.1.1"
 318 */
 319 static int ldb_msg_add_winsdb_addr(struct ldb_message *msg, struct winsdb_record *rec,
     /* [<][>][^][v][top][bottom][index][help] */
 320                                    const char *attr_name, struct winsdb_addr *addr)
 321 {
 322         struct ldb_val val;
 323         const char *str;
 324 
 325         if (rec->is_static) {
 326                 str = talloc_strdup(msg, addr->address);
 327                 if (!str) return -1;
 328         } else {
 329                 char *expire_time;
 330                 expire_time = ldb_timestring(msg, addr->expire_time);
 331                 if (!expire_time) return -1;
 332                 str = talloc_asprintf(msg, "%s;winsOwner:%s;expireTime:%s;",
 333                                       addr->address, addr->wins_owner,
 334                                       expire_time);
 335                 talloc_free(expire_time);
 336                 if (!str) return -1;
 337         }
 338 
 339         val.data = discard_const_p(uint8_t, str);
 340         val.length = strlen(str);
 341 
 342         return ldb_msg_add_value(msg, attr_name, &val, NULL);
 343 }
 344 
 345 struct winsdb_addr **winsdb_addr_list_make(TALLOC_CTX *mem_ctx)
     /* [<][>][^][v][top][bottom][index][help] */
 346 {
 347         struct winsdb_addr **addresses;
 348 
 349         addresses = talloc_array(mem_ctx, struct winsdb_addr *, 1);
 350         if (!addresses) return NULL;
 351 
 352         addresses[0] = NULL;
 353 
 354         return addresses;
 355 }
 356 
 357 static int winsdb_addr_sort_list (struct winsdb_addr **p1, struct winsdb_addr **p2, void *opaque)
     /* [<][>][^][v][top][bottom][index][help] */
 358 {
 359         struct winsdb_addr *a1 = talloc_get_type(*p1, struct winsdb_addr);
 360         struct winsdb_addr *a2 = talloc_get_type(*p2, struct winsdb_addr);
 361         struct winsdb_handle *h= talloc_get_type(opaque, struct winsdb_handle);
 362         bool a1_owned = false;
 363         bool a2_owned = false;
 364 
 365         /*
 366          * first the owned addresses with the newest to the oldest address
 367          * then the replica addresses with the newest to the oldest address
 368          */
 369         if (a2->expire_time != a1->expire_time) {
 370                 return a2->expire_time - a1->expire_time;
 371         }
 372 
 373         if (strcmp(a2->wins_owner, h->local_owner) == 0) {
 374                 a2_owned = true;
 375         }
 376 
 377         if (strcmp(a1->wins_owner, h->local_owner) == 0) {
 378                 a1_owned = true;
 379         }
 380 
 381         return a2_owned - a1_owned;
 382 }
 383 
 384 struct winsdb_addr **winsdb_addr_list_add(struct winsdb_handle *h, const struct winsdb_record *rec,
     /* [<][>][^][v][top][bottom][index][help] */
 385                                           struct winsdb_addr **addresses, const char *address,
 386                                           const char *wins_owner, time_t expire_time,
 387                                           bool is_name_registration)
 388 {
 389         struct winsdb_addr *old_addr = NULL;
 390         size_t len = 0;
 391         size_t i;
 392         bool found_old_replica = false;
 393 
 394         /*
 395          * count the addresses and maybe
 396          * find an old entry for the new address
 397          */
 398         for (i=0; addresses[i]; i++) {
 399                 if (old_addr) continue;
 400                 if (strcmp(addresses[i]->address, address) == 0) {
 401                         old_addr = addresses[i];
 402                 }
 403         }
 404         len = i;
 405 
 406         /*
 407          * the address is already there
 408          * and we can replace it
 409          */
 410         if (old_addr) {
 411                 goto remove_old_addr;
 412         }
 413 
 414         /*
 415          * if we don't have 25 addresses already,
 416          * we can just add the new address
 417          */
 418         if (len < 25) {
 419                 goto add_new_addr;
 420         }
 421 
 422         /*
 423          * if we haven't found the address,
 424          * and we have already have 25 addresses
 425          * if so then we need to do the following:
 426          * - if it isn't a name registration, then just ignore the new address
 427          * - if it is a name registration, then first search for 
 428          *   the oldest replica and if there's no replica address
 429          *   search the oldest owned address
 430          */
 431         if (!is_name_registration) {
 432                 return addresses;
 433         }
 434 
 435         /*
 436          * find the oldest replica address, if there's no replica
 437          * record at all, find the oldest owned address
 438          */
 439         for (i=0; addresses[i]; i++) {
 440                 bool cur_is_replica = false;
 441                 /* find out if the current address is a replica */
 442                 if (strcmp(addresses[i]->wins_owner, h->local_owner) != 0) {
 443                         cur_is_replica = true;
 444                 }
 445 
 446                 /*
 447                  * if we already found a replica address and the current address
 448                  * is not a replica, then skip it
 449                  */
 450                 if (found_old_replica && !cur_is_replica) continue;
 451 
 452                 /*
 453                  * if we found the first replica address, reset the address
 454                  * that would be replaced
 455                  */
 456                 if (!found_old_replica && cur_is_replica) {
 457                         found_old_replica = true;
 458                         old_addr = addresses[i];
 459                         continue;
 460                 }
 461 
 462                 /*
 463                  * if the first address isn't a replica, just start with 
 464                  * the first one
 465                  */
 466                 if (!old_addr) {
 467                         old_addr = addresses[i];
 468                         continue;
 469                 }
 470 
 471                 /*
 472                  * see if we find an older address
 473                  */
 474                 if (addresses[i]->expire_time < old_addr->expire_time) {
 475                         old_addr = addresses[i];
 476                         continue;
 477                 }
 478         }
 479 
 480 remove_old_addr:
 481         winsdb_addr_list_remove(addresses, old_addr->address);
 482         len --;
 483 
 484 add_new_addr:
 485         addresses = talloc_realloc(addresses, addresses, struct winsdb_addr *, len + 2);
 486         if (!addresses) return NULL;
 487 
 488         addresses[len] = talloc(addresses, struct winsdb_addr);
 489         if (!addresses[len]) {
 490                 talloc_free(addresses);
 491                 return NULL;
 492         }
 493 
 494         addresses[len]->address = talloc_strdup(addresses[len], address);
 495         if (!addresses[len]->address) {
 496                 talloc_free(addresses);
 497                 return NULL;
 498         }
 499 
 500         addresses[len]->wins_owner = talloc_strdup(addresses[len], wins_owner);
 501         if (!addresses[len]->wins_owner) {
 502                 talloc_free(addresses);
 503                 return NULL;
 504         }
 505 
 506         addresses[len]->expire_time = expire_time;
 507 
 508         addresses[len+1] = NULL;
 509 
 510         ldb_qsort(addresses, len+1 , sizeof(addresses[0]), h, (ldb_qsort_cmp_fn_t)winsdb_addr_sort_list);
 511 
 512         return addresses;
 513 }
 514 
 515 void winsdb_addr_list_remove(struct winsdb_addr **addresses, const char *address)
     /* [<][>][^][v][top][bottom][index][help] */
 516 {
 517         size_t i;
 518 
 519         for (i=0; addresses[i]; i++) {
 520                 if (strcmp(addresses[i]->address, address) == 0) {
 521                         break;
 522                 }
 523         }
 524 
 525         for (; addresses[i]; i++) {
 526                 addresses[i] = addresses[i+1];
 527         }
 528 
 529         return;
 530 }
 531 
 532 struct winsdb_addr *winsdb_addr_list_check(struct winsdb_addr **addresses, const char *address)
     /* [<][>][^][v][top][bottom][index][help] */
 533 {
 534         size_t i;
 535 
 536         for (i=0; addresses[i]; i++) {
 537                 if (strcmp(addresses[i]->address, address) == 0) {
 538                         return addresses[i];
 539                 }
 540         }
 541 
 542         return NULL;
 543 }
 544 
 545 size_t winsdb_addr_list_length(struct winsdb_addr **addresses)
     /* [<][>][^][v][top][bottom][index][help] */
 546 {
 547         size_t i;
 548         for (i=0; addresses[i]; i++);
 549         return i;
 550 }
 551 
 552 const char **winsdb_addr_string_list(TALLOC_CTX *mem_ctx, struct winsdb_addr **addresses)
     /* [<][>][^][v][top][bottom][index][help] */
 553 {
 554         size_t len = winsdb_addr_list_length(addresses);
 555         const char **str_list=NULL;
 556         size_t i;
 557 
 558         for (i=0; i < len; i++) {
 559                 str_list = str_list_add(str_list, addresses[i]->address);
 560                 if (!str_list[i]) {
 561                         return NULL;
 562                 }
 563         }
 564         talloc_steal(mem_ctx, str_list);
 565         return str_list;
 566 }
 567 
 568 /*
 569   load a WINS entry from the database
 570 */
 571 NTSTATUS winsdb_lookup(struct winsdb_handle *h, 
     /* [<][>][^][v][top][bottom][index][help] */
 572                        const struct nbt_name *name,
 573                        TALLOC_CTX *mem_ctx,
 574                        struct winsdb_record **_rec)
 575 {
 576         NTSTATUS status;
 577         struct ldb_result *res = NULL;
 578         int ret;
 579         struct winsdb_record *rec;
 580         struct ldb_context *wins_db = h->ldb;
 581         TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
 582         time_t now = time(NULL);
 583 
 584         /* find the record in the WINS database */
 585         ret = ldb_search(wins_db, tmp_ctx, &res,
 586                          winsdb_dn(tmp_ctx, wins_db, name),
 587                          LDB_SCOPE_BASE, NULL, NULL);
 588 
 589         if (ret != LDB_SUCCESS || res->count > 1) {
 590                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 591                 goto failed;
 592         } else if (res->count== 0) {
 593                 status = NT_STATUS_OBJECT_NAME_NOT_FOUND;
 594                 goto failed;
 595         }
 596 
 597         status = winsdb_record(h, res->msgs[0], tmp_ctx, now, &rec);
 598         if (!NT_STATUS_IS_OK(status)) goto failed;
 599 
 600         talloc_steal(mem_ctx, rec);
 601         talloc_free(tmp_ctx);
 602         *_rec = rec;
 603         return NT_STATUS_OK;
 604 
 605 failed:
 606         talloc_free(tmp_ctx);
 607         return status;
 608 }
 609 
 610 NTSTATUS winsdb_record(struct winsdb_handle *h, struct ldb_message *msg, TALLOC_CTX *mem_ctx, time_t now, struct winsdb_record **_rec)
     /* [<][>][^][v][top][bottom][index][help] */
 611 {
 612         NTSTATUS status;
 613         struct winsdb_record *rec;
 614         struct ldb_message_element *el;
 615         struct nbt_name *name;
 616         uint32_t i, j, num_values;
 617 
 618         rec = talloc(mem_ctx, struct winsdb_record);
 619         if (rec == NULL) {
 620                 status = NT_STATUS_NO_MEMORY;
 621                 goto failed;
 622         }
 623 
 624         status = winsdb_nbt_name(rec, msg->dn, &name);
 625         if (!NT_STATUS_IS_OK(status)) goto failed;
 626 
 627         if (strlen(name->name) > 15) {
 628                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 629                 goto failed;
 630         }
 631         if (name->scope && strlen(name->scope) > 238) {
 632                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 633                 goto failed;
 634         }
 635 
 636         /* parse it into a more convenient winsdb_record structure */
 637         rec->name               = name;
 638         rec->type               = ldb_msg_find_attr_as_int(msg, "recordType", WREPL_TYPE_UNIQUE);
 639         rec->state              = ldb_msg_find_attr_as_int(msg, "recordState", WREPL_STATE_RELEASED);
 640         rec->node               = ldb_msg_find_attr_as_int(msg, "nodeType", WREPL_NODE_B);
 641         rec->is_static          = ldb_msg_find_attr_as_int(msg, "isStatic", 0);
 642         rec->expire_time        = ldb_string_to_time(ldb_msg_find_attr_as_string(msg, "expireTime", NULL));
 643         rec->version            = ldb_msg_find_attr_as_uint64(msg, "versionID", 0);
 644         rec->wins_owner         = ldb_msg_find_attr_as_string(msg, "winsOwner", NULL);
 645         rec->registered_by      = ldb_msg_find_attr_as_string(msg, "registeredBy", NULL);
 646         talloc_steal(rec, rec->wins_owner);
 647         talloc_steal(rec, rec->registered_by);
 648 
 649         if (!rec->wins_owner || strcmp(rec->wins_owner, "0.0.0.0") == 0) {
 650                 rec->wins_owner = h->local_owner;
 651         }
 652 
 653         el = ldb_msg_find_element(msg, "address");
 654         if (el) {
 655                 num_values = el->num_values;
 656         } else {
 657                 num_values = 0;
 658         }
 659 
 660         if (rec->type == WREPL_TYPE_UNIQUE || rec->type == WREPL_TYPE_GROUP) {
 661                 if (num_values != 1) {
 662                         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 663                         goto failed;
 664                 }
 665         }
 666         if (rec->state == WREPL_STATE_ACTIVE) {
 667                 if (num_values < 1) {
 668                         status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 669                         goto failed;
 670                 }
 671         }
 672         if (num_values > 25) {
 673                 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
 674                 goto failed;
 675         }
 676 
 677         rec->addresses     = talloc_array(rec, struct winsdb_addr *, num_values+1);
 678         if (rec->addresses == NULL) {
 679                 status = NT_STATUS_NO_MEMORY;
 680                 goto failed;
 681         }
 682 
 683         for (i=0,j=0;i<num_values;i++) {
 684                 bool we_are_owner = false;
 685 
 686                 status = winsdb_addr_decode(h, rec, &el->values[i], rec->addresses, &rec->addresses[j]);
 687                 if (!NT_STATUS_IS_OK(status)) goto failed;
 688 
 689                 if (strcmp(rec->addresses[j]->wins_owner, h->local_owner) == 0) {
 690                         we_are_owner = true;
 691                 }
 692 
 693                 /*
 694                  * the record isn't static and is active
 695                  * then don't add the address if it's expired,
 696                  * but only if we're the owner of the address
 697                  *
 698                  * This is important for SGROUP records,
 699                  * because each server thinks he's the owner of the
 700                  * record and the record isn't replicated on a
 701                  * name_refresh. So addresses owned by another owner
 702                  * could expire, but we still need to return them
 703                  * (as windows does).
 704                  */
 705                 if (!rec->is_static &&
 706                     rec->addresses[j]->expire_time <= now &&
 707                     rec->state == WREPL_STATE_ACTIVE &&
 708                     we_are_owner) {
 709                         DEBUG(5,("WINS: expiring name addr %s of %s (expired at %s)\n", 
 710                                  rec->addresses[j]->address, nbt_name_string(rec->addresses[j], rec->name),
 711                                  timestring(rec->addresses[j], rec->addresses[j]->expire_time)));
 712                         talloc_free(rec->addresses[j]);
 713                         rec->addresses[j] = NULL;
 714                         continue;
 715                 }
 716                 j++;
 717         }
 718         rec->addresses[j] = NULL;
 719         num_values = j;
 720 
 721         if (rec->is_static && rec->state == WREPL_STATE_ACTIVE) {
 722                 rec->expire_time = get_time_t_max();
 723                 for (i=0;rec->addresses[i];i++) {
 724                         rec->addresses[i]->expire_time = rec->expire_time;
 725                 }
 726         }
 727 
 728         if (rec->state == WREPL_STATE_ACTIVE) {
 729                 if (num_values < 1) {
 730                         DEBUG(5,("WINS: expiring name %s (because it has no active addresses)\n", 
 731                                  nbt_name_string(mem_ctx, rec->name)));
 732                         rec->state = WREPL_STATE_RELEASED;
 733                 }
 734         }
 735 
 736         *_rec = rec;
 737         return NT_STATUS_OK;
 738 failed:
 739         if (NT_STATUS_EQUAL(NT_STATUS_INTERNAL_DB_CORRUPTION, status)) {
 740                 DEBUG(1,("winsdb_record: corrupted record: %s\n", ldb_dn_get_linearized(msg->dn)));
 741         }
 742         talloc_free(rec);
 743         return status;
 744 }
 745 
 746 /*
 747   form a ldb_message from a winsdb_record
 748 */
 749 static struct ldb_message *winsdb_message(struct ldb_context *ldb,
     /* [<][>][^][v][top][bottom][index][help] */
 750                                           struct winsdb_record *rec,
 751                                           TALLOC_CTX *mem_ctx)
 752 {
 753         int i, ret=0;
 754         size_t addr_count;
 755         const char *expire_time;
 756         struct ldb_message *msg = ldb_msg_new(mem_ctx);
 757         if (msg == NULL) goto failed;
 758 
 759         /* make sure we don't put in corrupted records */
 760         addr_count = winsdb_addr_list_length(rec->addresses);
 761         if (rec->state == WREPL_STATE_ACTIVE && addr_count == 0) {
 762                 rec->state = WREPL_STATE_RELEASED;
 763         }
 764         if (rec->type == WREPL_TYPE_UNIQUE && addr_count > 1) {
 765                 rec->type = WREPL_TYPE_MHOMED;
 766         }
 767 
 768         expire_time = ldb_timestring(msg, rec->expire_time);
 769         if (!expire_time) {
 770                 goto failed;
 771         }
 772 
 773         msg->dn = winsdb_dn(msg, ldb, rec->name);
 774         if (msg->dn == NULL) goto failed;
 775         ret |= ldb_msg_add_fmt(msg, "type", "0x%02X", rec->name->type);
 776         if (rec->name->name && *rec->name->name) {
 777                 ret |= ldb_msg_add_string(msg, "name", rec->name->name);
 778         }
 779         if (rec->name->scope && *rec->name->scope) {
 780                 ret |= ldb_msg_add_string(msg, "scope", rec->name->scope);
 781         }
 782         ret |= ldb_msg_add_fmt(msg, "objectClass", "winsRecord");
 783         ret |= ldb_msg_add_fmt(msg, "recordType", "%u", rec->type);
 784         ret |= ldb_msg_add_fmt(msg, "recordState", "%u", rec->state);
 785         ret |= ldb_msg_add_fmt(msg, "nodeType", "%u", rec->node);
 786         ret |= ldb_msg_add_fmt(msg, "isStatic", "%u", rec->is_static);
 787         ret |= ldb_msg_add_empty(msg, "expireTime", 0, NULL);
 788         if (!(rec->is_static && rec->state == WREPL_STATE_ACTIVE)) {
 789                 ret |= ldb_msg_add_string(msg, "expireTime", expire_time);
 790         }
 791         ret |= ldb_msg_add_fmt(msg, "versionID", "%llu", (long long)rec->version);
 792         ret |= ldb_msg_add_string(msg, "winsOwner", rec->wins_owner);
 793         ret |= ldb_msg_add_empty(msg, "address", 0, NULL);
 794         for (i=0;rec->addresses[i];i++) {
 795                 ret |= ldb_msg_add_winsdb_addr(msg, rec, "address", rec->addresses[i]);
 796         }
 797         ret |= ldb_msg_add_empty(msg, "registeredBy", 0, NULL);
 798         if (rec->registered_by) {
 799                 ret |= ldb_msg_add_string(msg, "registeredBy", rec->registered_by);
 800                 if (ret != 0) goto failed;
 801         }
 802         return msg;
 803 
 804 failed:
 805         talloc_free(msg);
 806         return NULL;
 807 }
 808 
 809 /*
 810   save a WINS record into the database
 811 */
 812 uint8_t winsdb_add(struct winsdb_handle *h, struct winsdb_record *rec, uint32_t flags)
     /* [<][>][^][v][top][bottom][index][help] */
 813 {
 814         struct ldb_message *msg;
 815         struct ldb_context *wins_db = h->ldb;
 816         TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
 817         int trans = -1;
 818         int ret = 0;
 819 
 820         trans = ldb_transaction_start(wins_db);
 821         if (trans != LDB_SUCCESS) goto failed;
 822 
 823         if (flags & WINSDB_FLAG_ALLOC_VERSION) {
 824                 /* passing '0' means auto-allocate a new one */
 825                 rec->version = winsdb_set_maxVersion(h, 0);
 826                 if (rec->version == 0) goto failed;
 827         }
 828         if (flags & WINSDB_FLAG_TAKE_OWNERSHIP) {
 829                 rec->wins_owner = h->local_owner;
 830         }
 831 
 832         msg = winsdb_message(wins_db, rec, tmp_ctx);
 833         if (msg == NULL) goto failed;
 834         ret = ldb_add(wins_db, msg);
 835         if (ret != 0) goto failed;
 836 
 837         trans = ldb_transaction_commit(wins_db);
 838         if (trans != LDB_SUCCESS) goto failed;
 839 
 840         wins_hook(h, rec, WINS_HOOK_ADD, h->hook_script);
 841 
 842         talloc_free(tmp_ctx);
 843         return NBT_RCODE_OK;
 844 
 845 failed:
 846         if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
 847         talloc_free(tmp_ctx);
 848         return NBT_RCODE_SVR;
 849 }
 850 
 851 
 852 /*
 853   modify a WINS record in the database
 854 */
 855 uint8_t winsdb_modify(struct winsdb_handle *h, struct winsdb_record *rec, uint32_t flags)
     /* [<][>][^][v][top][bottom][index][help] */
 856 {
 857         struct ldb_message *msg;
 858         struct ldb_context *wins_db = h->ldb;
 859         TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
 860         int trans;
 861         int ret;
 862         int i;
 863 
 864         trans = ldb_transaction_start(wins_db);
 865         if (trans != LDB_SUCCESS) goto failed;
 866 
 867         if (flags & WINSDB_FLAG_ALLOC_VERSION) {
 868                 /* passing '0' means auto-allocate a new one */
 869                 rec->version = winsdb_set_maxVersion(h, 0);
 870                 if (rec->version == 0) goto failed;
 871         }
 872         if (flags & WINSDB_FLAG_TAKE_OWNERSHIP) {
 873                 rec->wins_owner = h->local_owner;
 874         }
 875 
 876         msg = winsdb_message(wins_db, rec, tmp_ctx);
 877         if (msg == NULL) goto failed;
 878 
 879         for (i=0;i<msg->num_elements;i++) {
 880                 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
 881         }
 882 
 883         ret = ldb_modify(wins_db, msg);
 884         if (ret != 0) goto failed;
 885 
 886         trans = ldb_transaction_commit(wins_db);
 887         if (trans != LDB_SUCCESS) goto failed;
 888 
 889         wins_hook(h, rec, WINS_HOOK_MODIFY, h->hook_script);
 890 
 891         talloc_free(tmp_ctx);
 892         return NBT_RCODE_OK;
 893 
 894 failed:
 895         if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
 896         talloc_free(tmp_ctx);
 897         return NBT_RCODE_SVR;
 898 }
 899 
 900 
 901 /*
 902   delete a WINS record from the database
 903 */
 904 uint8_t winsdb_delete(struct winsdb_handle *h, struct winsdb_record *rec)
     /* [<][>][^][v][top][bottom][index][help] */
 905 {
 906         struct ldb_context *wins_db = h->ldb;
 907         TALLOC_CTX *tmp_ctx = talloc_new(wins_db);
 908         struct ldb_dn *dn;
 909         int trans;
 910         int ret;
 911 
 912         trans = ldb_transaction_start(wins_db);
 913         if (trans != LDB_SUCCESS) goto failed;
 914 
 915         dn = winsdb_dn(tmp_ctx, wins_db, rec->name);
 916         if (dn == NULL) goto failed;
 917 
 918         ret = ldb_delete(wins_db, dn);
 919         if (ret != 0) goto failed;
 920 
 921         trans = ldb_transaction_commit(wins_db);
 922         if (trans != LDB_SUCCESS) goto failed;
 923 
 924         wins_hook(h, rec, WINS_HOOK_DELETE, h->hook_script);
 925 
 926         talloc_free(tmp_ctx);
 927         return NBT_RCODE_OK;
 928 
 929 failed:
 930         if (trans == LDB_SUCCESS) ldb_transaction_cancel(wins_db);
 931         talloc_free(tmp_ctx);
 932         return NBT_RCODE_SVR;
 933 }
 934 
 935 static bool winsdb_check_or_add_module_list(struct tevent_context *ev_ctx, 
     /* [<][>][^][v][top][bottom][index][help] */
 936                                             struct loadparm_context *lp_ctx, struct winsdb_handle *h)
 937 {
 938         int trans;
 939         int ret;
 940         struct ldb_dn *dn;
 941         struct ldb_result *res = NULL;
 942         struct ldb_message *msg = NULL;
 943         TALLOC_CTX *tmp_ctx = talloc_new(h);
 944         unsigned int flags = 0;
 945 
 946         trans = ldb_transaction_start(h->ldb);
 947         if (trans != LDB_SUCCESS) goto failed;
 948 
 949         /* check if we have a special @MODULES record already */
 950         dn = ldb_dn_new(tmp_ctx, h->ldb, "@MODULES");
 951         if (!dn) goto failed;
 952 
 953         /* find the record in the WINS database */
 954         ret = ldb_search(h->ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
 955         if (ret != LDB_SUCCESS) goto failed;
 956 
 957         if (res->count > 0) goto skip;
 958 
 959         /* if there's no record, add one */
 960         msg = ldb_msg_new(tmp_ctx);
 961         if (!msg) goto failed;
 962         msg->dn = dn;
 963 
 964         ret = ldb_msg_add_string(msg, "@LIST", "wins_ldb");
 965         if (ret != 0) goto failed;
 966 
 967         ret = ldb_add(h->ldb, msg);
 968         if (ret != 0) goto failed;
 969 
 970         trans = ldb_transaction_commit(h->ldb);
 971         if (trans != LDB_SUCCESS) goto failed;
 972 
 973         /* close and reopen the database, with the modules */
 974         trans = LDB_ERR_OTHER;
 975         talloc_free(h->ldb);
 976         h->ldb = NULL;
 977 
 978         if (lp_parm_bool(lp_ctx, NULL,"winsdb", "nosync", false)) {
 979                 flags |= LDB_FLG_NOSYNC;
 980         }
 981 
 982         h->ldb = ldb_wrap_connect(h, ev_ctx, lp_ctx, lock_path(h, lp_ctx, lp_wins_url(lp_ctx)),
 983                                   NULL, NULL, flags, NULL);
 984         if (!h->ldb) goto failed;
 985 
 986         talloc_free(tmp_ctx);
 987         return true;
 988 
 989 skip:
 990         if (trans == LDB_SUCCESS) ldb_transaction_cancel(h->ldb);
 991         talloc_free(tmp_ctx);
 992         return true;
 993 
 994 failed:
 995         if (trans == LDB_SUCCESS) ldb_transaction_cancel(h->ldb);
 996         talloc_free(tmp_ctx);
 997         return false;
 998 }
 999 
1000 struct winsdb_handle *winsdb_connect(TALLOC_CTX *mem_ctx, 
     /* [<][>][^][v][top][bottom][index][help] */
1001                                      struct tevent_context *ev_ctx,
1002                                      struct loadparm_context *lp_ctx,
1003                                      const char *owner,
1004                                      enum winsdb_handle_caller caller)
1005 {
1006         struct winsdb_handle *h = NULL;
1007         unsigned int flags = 0;
1008         bool ret;
1009         int ldb_err;
1010 
1011         h = talloc_zero(mem_ctx, struct winsdb_handle);
1012         if (!h) return NULL;
1013 
1014         if (lp_parm_bool(lp_ctx, NULL,"winsdb", "nosync", false)) {
1015                 flags |= LDB_FLG_NOSYNC;
1016         }
1017 
1018         h->ldb = ldb_wrap_connect(h, ev_ctx, lp_ctx, lock_path(h, lp_ctx, lp_wins_url(lp_ctx)),
1019                                   NULL, NULL, flags, NULL);
1020         if (!h->ldb) goto failed;       
1021 
1022         h->caller = caller;
1023         h->hook_script = lp_wins_hook(lp_ctx);
1024 
1025         h->local_owner = talloc_strdup(h, owner);
1026         if (!h->local_owner) goto failed;
1027 
1028         /* make sure the module list is available and used */
1029         ret = winsdb_check_or_add_module_list(ev_ctx, lp_ctx, h);
1030         if (!ret) goto failed;
1031 
1032         ldb_err = ldb_set_opaque(h->ldb, "winsdb_handle", h);
1033         if (ldb_err != LDB_SUCCESS) goto failed;
1034 
1035         return h;
1036 failed:
1037         talloc_free(h);
1038         return NULL;
1039 }

/* [<][>][^][v][top][bottom][index][help] */